WO2019208175A1 - Absorbent article - Google Patents

Abstract

This absorbent article has: an absorbent body (10) provided with an absorbent core (11A); and a pair of waist parts (20). The waist parts (20) are provided with a skin-side sheet part (221) positioned to be closest to the skin and a plurality of rubber threads (23) stretchable in the transverse direction. In the waist parts (20), the skin-side sheet part (221) has a bending stiffness, as measured by the KES method, of 0.0096 N·m²/m × 10^-4 or less, and an inner layer sheet part (21) is disposed between the skin-side sheet part (221) and the rubber threads (23) in the thickness direction of the waist parts (20) and positioned on the waist side from the absorbent body (10) in the vertical direction. The bending stiffness of the inner layer sheet part (21), as measured by the KES method, is higher than the bending stiffness of the skin-side sheet part (221).

Description

Absorbent articles

The present invention relates to an absorbent article.

Patent Document 1 includes a liquid-permeable top sheet, a liquid-impermeable back side sheet, an absorbent main body (main body part) having an absorbent body therebetween, and an exterior sheet that covers the back side of the absorbent main body. An absorbent article provided is disclosed. In addition, it was found that the flexibility of the outermost nonwoven fabric among the outer sheets has a strong influence on the flexibility of the entire absorbent article, and the twist of the outermost nonwoven fabric is 3.8 gf · cm / cm or less, which is a flexible nonwoven fabric. It has been disclosed.
Furthermore, in patent document 1, all the nonwoven fabrics which comprise an exterior sheet, ie, the front-and-rear pressing sheet which covers the front-and-rear end part of an absorptive main body, and the upper-layer nonwoven fabric which clamps a rubber thread together with the outermost nonwoven fabric, It is desirable to employ a similar flexible nonwoven fabric. Further, it is disclosed that a portion where the flexible outermost nonwoven fabric is folded back to the inner surface may be extended to a portion overlapping the front and rear end portions of the absorbent main body to form a front and rear presser sheet.

JP 2010-131167 A

The problem to be solved by the present invention is at least one of the following first to second problems.
The first problem is that in the above case, the material disposed on the skin side from the rubber thread is only a flexible nonwoven fabric. Then, the linear pressure of the thread rubber is hardly absorbed and relaxed by the nonwoven fabric on the skin side, and the thread rubber is fixed to the wearer's skin with the nonwoven fabric wrapped around the thread rubber. Therefore, the linear pressure of the rubber thread is likely to be applied to the wearer's skin, and the rubber thread marks are likely to adhere to the wearer's skin. In particular, the wearer's waistline often protrudes a lot, and rubber marks are easily attached to the wearer's waistline.

Therefore, an object of the present invention is to provide an absorbent article that makes it difficult to make rubber marks around the wearer's torso.

The second problem is that, in the above case, the material disposed on the skin side from the end portion (front and rear end portions) on the waistline side of the absorbent main body is only a flexible nonwoven fabric. Since a plurality of materials are laminated or an adhesive is applied to the end portion on the waistline side of the absorbent main body, the end portion on the waistline side of the absorbent main body is relatively hard. For this reason, the hardness of the edge of the absorbent main body on the waistline side (that is, the hardness of the edge at the level difference between the portion where the absorbent main body exists and the portion where the absorbent main body does not exist) is difficult to be absorbed and relaxed by the flexible nonwoven fabric. Therefore, there is a risk of damaging the wearer's skin at the edge of the absorbent main body on the waistline side.

Therefore, an object of the present invention is to provide an absorbent article that does not easily damage the wearer's skin at the edge of the absorbent main body on the waistline side.

The main invention for achieving the first object has an absorbent main body having a longitudinal direction and a transverse direction, and having an absorbent core, and a pair of waistline portions. An absorbent article comprising a skin-side sheet portion arranged on the skin side and a plurality of thread rubbers that can be expanded and contracted in the lateral direction, wherein at least one waistline portion of the pair of waistline portions, the skin The bending rigidity by the KES method of the side sheet portion is 0.0096 N · m ² / m × 10 ⁻⁴ or less, between the skin side sheet portion and the thread rubber in the thickness direction of the waistline portion, An absorbent article having an inner layer sheet portion on the waist side from the absorbent main body in the longitudinal direction, wherein the bending rigidity of the inner layer sheet portion by the KES method is higher than the bending rigidity of the skin side sheet portion. It is.

The main invention for achieving the second subject has an absorbent body having a longitudinal direction and a transverse direction and having an absorbent core, and a pair of waistline portions. An absorbent article including a skin-side sheet portion disposed on the skin side, wherein at least one waistline portion of the pair of waistline portions has a flexural rigidity by the KES method of the skin-side sheet portion of 0.0096 N · m ² / m × 10 ⁻⁴ or less, an inner layer sheet portion is arranged on the non-skin side from the skin side sheet portion, and the bending rigidity of the inner layer sheet portion by the KES method is the bending rigidity of the skin side sheet portion Further, the inner layer sheet portion is an absorbent article characterized in that it is disposed on the skin side of the absorbent main body across the edge of the absorbent main body in the longitudinal direction on the waistline side.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

The effect of the present invention with respect to the first problem can provide an absorbent article that makes it difficult to leave rubber marks around the wearer's waist.

The effect of the present invention with respect to the second problem can provide an absorbent article that is unlikely to damage the wearer's skin at the edge of the absorbent main body on the waistline side.

1 is a perspective view of a pants-type disposable diaper 1. FIG. It is a top view of the diaper 1 of the expansion | deployment and expansion | extension state. It is sectional drawing in the II line | wire of FIG. FIG. 4A is a schematic cross-sectional view in which the waistline portion 40 of the comparative example is cut in the thickness direction, and FIG. 4B is a schematic cross-sectional view in which the waistline portion 20 of the present embodiment is cut in the thickness direction. It is the figure which expanded sectional drawing of the abdominal side waist part 20 shown in FIG. 6 is a cross-sectional view of a modified example of the waistline portion 20. FIG. 6 is a cross-sectional view of a modified example of the waistline portion 20. FIG. 6 is a cross-sectional view of a modified example of the waistline portion 20. FIG. 6 is a cross-sectional view of a modified example of the waistline portion 20. FIG. It is a perspective view of the underpants type disposable diaper 1 of a 2nd embodiment. It is a top view of the diaper 1 of the expansion | deployment and expansion | extension state. It is sectional drawing in the II line | wire of FIG. FIG. 13A is a schematic cross-sectional view showing the contracted state of the skin-side sheet portion 40 of the comparative example, and FIG. 13B is a schematic cross-sectional view showing the contracted state of the skin-side sheet portion 221 of the present embodiment. It is the figure which expanded sectional drawing of the abdominal side waist part 20 shown in FIG. 6 is a cross-sectional view of a modified example of the waistline portion 20. FIG. 6 is a cross-sectional view of a modified example of the waistline portion 20. FIG. 6 is a cross-sectional view of a modified example of the waistline portion 20. FIG.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
An absorptive main body which has a longitudinal direction and a transverse direction, and has an absorptive core, and a pair of girth parts, the girth part is the skin side sheet part arranged on the most skin side, and An absorbent article comprising a plurality of rubber threads that can be expanded and contracted in the transverse direction, wherein at least one of the pair of waistline portions has a flexural rigidity of 0.0096 N · m ² / m × 10 ⁻⁴ or less, between the skin-side sheet portion and the rubber thread in the thickness direction of the waistline portion, and on the waistline side from the absorbent main body in the longitudinal direction, an inner layer sheet The absorbent article is characterized in that the inner layer sheet portion has a bending rigidity higher by the KES method than the bending rigidity of the skin side sheet portion.

According to such an absorbent article, since the bending rigidity of the skin side sheet portion is low, the unevenness formed in the waistline portion due to the shrinkage of the thread rubber is easily crushed, and it is difficult for the wearer's waistline to be gathered. Moreover, since the linear pressure of the thread rubber is absorbed and relaxed by the inner layer sheet portion, it is difficult for rubber marks to be attached around the wearer's waist.

In this absorbent article, the waistline portion includes a non-skin side sheet portion disposed on the most non-skin side, and the rubber thread includes the inner layer sheet portion and the non-skin side sheet portion in the thickness direction. The skin-side sheet portion is an absorbent article characterized in that an end portion on the waistline side of the non-skin-side sheet portion in the longitudinal direction is a portion folded back to the skin side. .

According to such an absorbent article, the non-skin side sheet portion has a low bending rigidity like the skin side sheet portion, and the skin contact from the non-skin side can be improved.

Such an absorbent article, characterized in that the end portion on the waistline side of the inner layer sheet portion in the longitudinal direction is also folded back to the skin side.

According to such an absorbent article, since the inner layer sheet portion disposed on the skin side from the rubber thread becomes two layers, rubber marks are less likely to be attached to the wearer's waist.

In this absorbent article, the waistline portion includes a second inner layer sheet portion disposed on the non-skin side from the inner layer sheet portion, and a non-skin side sheet portion disposed on the most non-skin side, The bending rigidity of the second inner layer sheet portion by the KES method is 0.0096 N · m ² / m × 10 ⁻⁴ or less, and the rubber thread is the second inner layer sheet portion and the non-skin side sheet in the thickness direction. The skin-side sheet portion is an absorbent article characterized in that the end portion on the waistline side of the non-skin-side sheet portion in the longitudinal direction is a portion folded back to the skin side. is there.

According to such an absorbent article, even when the bending stiffness of the second inner layer sheet portion is low, the linear pressure of the rubber thread is absorbed and relaxed by the inner layer sheet portion, so that it is difficult for rubber marks to be attached to the wearer's waist. Become.

In this absorbent article, the waistline portion includes a third inner layer sheet portion disposed on the non-skin side from the inner layer sheet portion, and a non-skin side sheet portion disposed on the most non-skin side, and , In the longitudinal direction, a waistline side portion on the waistline side from the absorbent main body, and a core side portion that overlaps the absorbent core in the thickness direction, and the plurality of thread rubbers on the waistline side portion A waistline-side thread rubber disposed on the core side portion; and a waistline-side thread rubber disposed between the inner layer sheet portion and the third inner layer sheet portion in the thickness direction. The core-side thread rubber is disposed between the third inner layer sheet portion and the non-skin-side sheet portion in the thickness direction.

According to such an absorbent article, the waistline side rubber thread is hardly visible from the non-skin side, and an impression that the waistline side portion fits softly can be given to the user. On the other hand, the core-side thread rubber can be easily seen from the non-skin side, the fit of the absorbent core is good, and an impression that does not leak easily can be given to the user.

In this absorbent article, the waistline portion has an intermediate portion between the waistline side portion and the core side portion in the longitudinal direction, and the plurality of rubber threads are disposed in the intermediate portion. The intermediate thread rubber is provided between the inner layer sheet portion and the third inner layer sheet portion in the thickness direction, and between the third inner layer sheet portion and the non-skin in the thickness direction. It is an absorptive article characterized by being arranged between each side sheet part.

According to such an absorbent article, the stretching force of the intermediate portion can be increased, so that the drooping of the absorbent main body can be suppressed.

In this absorbent article, the waistline portion includes a waistline side portion on the waistline side of the absorbent body in the longitudinal direction, and an absorbent body side portion that overlaps the absorbent body in the thickness direction. The value obtained by dividing the amount of force that extends the waistline side portion by the unit length in the lateral direction is divided by the length of the waistline side portion in the longitudinal direction. The absorbent article is characterized in that it is smaller than a value obtained by dividing the magnitude of the force to extend by a unit length by the length in the longitudinal direction of the absorbent main body side part.

According to such an absorbent article, since the elastic force of the waistline side portion is smaller than that of the absorbent main body side portion, gather marks and rubber marks are less likely to be attached to the wearer's waistline.

In this absorbent article, in the longitudinal direction, an end on the waistline side of the inner layer sheet portion is located on the waistline side with respect to the thread rubber disposed on the most waistline side among the plurality of thread rubbers. This is an absorbent article.

According to such an absorbent article, an inner layer sheet portion can be disposed on the skin side of more thread rubber, and rubber marks are less likely to be attached to the wearer's waist.

Such an absorbent article, characterized in that, in the longitudinal direction, the crotch side end of the inner layer sheet portion is located on the crotch side rather than the waist side end of the absorbent main body. Is

According to such an absorbent article, an inner layer sheet portion can be disposed on the skin side of more thread rubber, and rubber marks are less likely to be attached to the wearer's waist.

Such an absorbent article is characterized in that the skin-side sheet portion has a flexural rigidity by the KES method of 0.0035 N · m ² / m × 10 ⁻⁴ or more.

According to such an absorbent article, the tensile strength of the skin side sheet portion can be obtained appropriately, and the waistline portion can be prevented from breaking during wearing.

This absorbent article is characterized in that the compression recovery rate RC by the KES method of the skin side sheet portion is 15% or more and 50% or less.

According to such an absorbent article, the unevenness formed in the waistline portion is easily crushed due to the shrinkage of the rubber thread, and it becomes difficult for the wearer's waistline to be gathered.

In such an absorbent article, the skin-side sheet portion has a basis weight of 10 g / m ² or more and 30 g / m ² or less, and an apparent density at a load of 49.03 hPa is 0.12 g / cm ³ or more and 0.2 g / m ^2. It is an absorbent article characterized by being cm ³ or less.

According to such an absorbent article, the bending rigidity of the skin side sheet portion can be lowered and the flexibility can be increased.

In such an absorbent article, the skin-side sheet portion includes fibers having a fiber diameter of 14 μm or more and 22 μm or less, and a coefficient of variation MMD / MIU × 100 of a friction coefficient by the KES method is 2% or more and 6% or less. The absorbent article characterized by the above.

According to such an absorbent article, in the skin side sheet portion, the variation in the coefficient of friction is small, the number of fibers that come into contact with the user's fingertips is relatively large, and the touch is smooth, soft and soft. It becomes.

Such an absorbent article, wherein the friction coefficient MIU of the skin side sheet portion is at least 0.25.

According to such an absorbent article, the skin side sheet portion has a relatively large amount of fibers that come into contact with the user's fingertips, resulting in a smooth, soft and soft touch.

Such an absorbent article, wherein the skin-side sheet portion includes polyethylene fibers.

According to such an absorbent article, since the polyethylene fiber is softer than other thermoplastic resin fibers such as polypropylene fiber and PET (polyethylene terephthalate) fiber, the bending rigidity of the skin side sheet portion can be lowered. , Can increase flexibility.

An absorptive body having a longitudinal direction and a transverse direction, having an absorbent main body having an absorbent core, and a pair of waistline portions, wherein the waistline portion has a skin side sheet portion arranged on the most skin side. In at least one waistline part of the pair of waistline parts, the bending stiffness by the KES method of the skin side sheet part is 0.0096 N · m ² / m × 10 ⁻⁴ or less, and the skin An inner layer sheet portion is arranged on the non-skin side from the side sheet portion, and the bending rigidity by the KES method of the inner layer sheet portion is higher than the bending rigidity of the skin side sheet portion, and the inner layer sheet portion is formed of the absorbent main body. On the skin side, the absorbent article is disposed across the edge of the absorbent main body in the longitudinal direction on the waistline side.

According to such an absorbent article, since the bending rigidity of the skin-side sheet portion is low, the skin contact with the wearer can be improved, and the unevenness formed by the shrinkage of the waistline portion is easily crushed. Gather marks are less likely to stick around the waist. Moreover, since the hardness and level | step difference of the edge of an absorptive main body are absorbed-relaxed by an inner layer sheet | seat part, it can suppress that a wearer's skin is damaged by the edge of an absorptive main body.

In this absorbent article, the waistline portion includes a non-skin side sheet portion disposed on the most non-skin side, and the skin side sheet portion is located on the waistline side of the non-skin side sheet portion in the longitudinal direction. The inner layer sheet part is a part where the end part is folded back to the skin side, and the inner layer sheet part is a part where the end part on the waistline side in the longitudinal direction is folded back to the skin side. A non-skin side portion disposed on the side, and is extendable in the lateral direction between the non-skin side portion and the non-skin side sheet portion of the inner layer sheet portion in the thickness direction of the waistline portion A flexible elastic member is disposed, and the skin side portion of the inner layer sheet portion is disposed on the skin side of the absorbent main body so as to straddle the edge on the waistline side of the absorbent main body in the longitudinal direction. The absorbent article characterized by the above.

According to such an absorbent article, the inner layer sheet portion absorbs and relaxes the hardness and level difference of the edge of the absorbent main body, so that the wearer's skin is damaged by the edge of the absorbent main body. Can be suppressed. Moreover, since the bending rigidity of the non-skin-side sheet portion is low similarly to the skin-side sheet portion, the skin contact of the waistline portion from the non-skin side can be improved.

In such an absorbent article, in the longitudinal direction, the crotch side edge of the skin side part of the inner layer sheet portion is located on the crotch side from the waist side edge of the absorbent core. The absorbent article is characterized.

According to such an absorbent article, the inner layer sheet portion absorbs and relaxes the hardness and level difference of the edge of the absorbent core, so that the wearer's skin is damaged by the edge of the absorbent core. Can be suppressed.

In such an absorbent article, a stretchable sheet portion that is stretchable in the lateral direction is disposed between the skin side portion and the non-skin side portion of the inner layer sheet portion in the thickness direction of the waistline portion. The bending stiffness of the stretchable sheet portion according to the KES method is higher than the bending stiffness of the skin side sheet portion, and the stretchable sheet portion is on the skin side of the absorbent body and the absorbent body in the longitudinal direction. It is an absorbent article characterized by being disposed across the edge on the waistline side.

According to such an absorbent article, the inner layer sheet portion and the stretchable sheet portion absorb and relax the hardness and level difference of the edge of the absorbent main body, so that the wearer's skin is absorbed by the edge of the absorbent main body. It can suppress more that it hurts.

Such an absorbent article, wherein, in the longitudinal direction, the crotch side edge of the skin side part of the inner layer sheet part, the crotch side edge of the skin side sheet part, and the crotch of the stretchable sheet part The absorbent article is characterized in that the side edge is displaced.

According to such an absorbent article, since the level difference at the edge of each sheet part becomes small, it is possible to suppress the wearer's skin from being damaged by the edge of each sheet part.

Such an absorbent article is characterized in that, in the longitudinal direction, the crotch side edge of the skin side portion of the inner layer sheet portion is located on the crotch side.

According to such an absorbent article, the skin-side sheet portion with low rigidity may be located on the crotch side, or the elastic sheet portion may be curled on the crotch side. Can be suppressed.

Such an absorbent article, wherein the inner layer sheet portion is an elastic sheet portion that can be expanded and contracted in the lateral direction.

According to such an absorbent article, the elastic sheet portion absorbs and relaxes the hardness and level difference of the edge of the absorbent main body, and the waistline portion is brought into close contact with the wearer on the surface to suppress local tightening. Therefore, the wearer's waistline can be made more difficult to be damaged.

In such an absorbent article, in the longitudinal direction, the crotch side edge of the stretchable sheet portion is located closer to the waistline side than the waistline side edge of the absorbent core. It is a sex product.

According to such an absorbent article, it is possible to prevent the absorbent core from being excessively contracted by the stretchable sheet portion, and it is possible to maintain the flatness of the absorbent core.

In such an absorbent article, the skin-side sheet portion is disposed across the edge of the absorbent main body in the longitudinal direction on the skin side of the absorbent main body. It is an absorbent article.

According to such an absorbent article, the hardness and level difference of the edge of the absorbent main body are absorbed and relaxed by the inner layer sheet portion and the skin side sheet portion, so that the skin of the wearer is absorbed by the edge of the absorbent main body. It can suppress more that it hurts.

Such an absorbent article is characterized in that the skin-side sheet portion has a flexural rigidity by the KES method of 0.0035 N · m ² / m × 10 ⁻⁴ or more.

According to such an absorbent article, the tensile strength of the skin side sheet portion can be obtained appropriately, and the waistline portion can be prevented from breaking during wearing.

This absorbent article is characterized in that the compression recovery rate RC by the KES method of the skin side sheet portion is 15% or more and 50% or less.

According to such an absorbent article, the unevenness formed by the shrinkage of the waistline portion is easily crushed, and it becomes difficult for the wearer's waistline to be gathered.

In such an absorbent article, the skin-side sheet portion has a basis weight of 10 g / m ² or more and 30 g / m ² or less, and an apparent density at a load of 49.03 hPa is 0.12 g / cm ³ or more and 0.2 g / m ^2. It is an absorbent article characterized by being cm ³ or less.

According to such an absorbent article, the bending rigidity of the skin side sheet portion can be lowered and the flexibility can be increased.

In such an absorbent article, the skin-side sheet portion includes fibers having a fiber diameter of 14 μm or more and 22 μm or less, and a coefficient of variation MMD / MIU × 100 of a friction coefficient by the KES method is 2% or more and 6% or less. The absorbent article characterized by the above.

According to such an absorbent article, in the skin side sheet portion, the variation in the coefficient of friction is small, the number of fibers that come into contact with the user's fingertips is relatively large, and the touch is smooth, soft and soft. It becomes.

Such an absorbent article, wherein the friction coefficient MIU of the skin side sheet portion is at least 0.25.

According to such an absorbent article, the skin side sheet portion has a relatively large amount of fibers that come into contact with the user's fingertips, resulting in a smooth, soft and soft touch.

Such an absorbent article, wherein the skin-side sheet portion includes polyethylene fibers.

According to such an absorbent article, since the polyethylene fiber is softer than other thermoplastic resin fibers such as polypropylene fiber and PET (polyethylene terephthalate) fiber, the bending rigidity of the skin side sheet portion can be lowered. , Can increase flexibility.

=== Embodiment ===
Hereinafter, as an absorbent article according to the present invention, an embodiment will be described taking a pants-type disposable diaper for infants as an example. However, the absorbent article according to the present invention is not limited to a pants-type disposable diaper for infants, but can also be applied to a pants-type disposable diaper for adults, a tape-type disposable diaper, sanitary shorts, and the like.

<First Embodiment>
=== Configuration of the pants-type disposable diaper 1 ===
FIG. 1 is a perspective view of a pants-type disposable diaper 1 (hereinafter “diaper”). FIG. 2 is a plan view of the diaper 1 in the unfolded and extended state. FIG. 3 is a cross-sectional view taken along line II in FIG.

The diaper 1 has a vertical direction, a horizontal direction, and a front-rear direction in the pants-type state shown in FIG. 1, and a waistline opening BH and a pair of leg-hole openings LH are formed. In the vertical direction, the waistline side is the upper side, and the crotch side is the lower side. In the front-rear direction, the wearer's ventral side is the front side and the wearer's back side is the rear side. Moreover, as shown in FIG. 3, the direction in which the material which comprises the diaper 1 was laminated | stacked is called thickness direction, the side which contacts a wearer in thickness direction is made into the skin side, and the side which does not contact a wearer is non- The skin side.

Moreover, the diaper 1 has the absorptive main body 10 and a pair of waist parts 20 and 30 which are three members of the rectangular shape in planar view. Of the pair of waistline parts 20 and 30, the part that is applied to the wearer's stomach side part is referred to as the stomach side waist part 20, and the part that is applied to the wearer's back side part is referred to as the back side waistline part 30.

In the diaper 1 in the unfolded state shown in FIG. 2, the ventral waistline portion 20 and the back waistline portion 30 are arranged so that their longitudinal directions are along the lateral direction of the diaper 1. And the edge part of the longitudinal direction one side of the absorptive main body 10 is arrange | positioned in the center part of the abdominal side waist part 20 in a horizontal direction, and the longitudinal direction of the absorptive main body 10 is located in the center part of the back side waist part 30 in a horizontal direction. An end portion on the other side in the direction is arranged.

In the diaper 1 in the unfolded state shown in FIG. 2, the absorbent main body 10 is folded in half at the approximate center of the longitudinal direction so that the longitudinal direction of the absorbent main body 10 is along the longitudinal direction of the diaper 1. The pants-type diaper 1 shown in FIG. 1 is formed by joining both end portions of the abdominal waist portion 20 and both end portions of the back side waist portion 30 by welding, an adhesive, or the like.

As shown in FIG. 3, the absorbent main body 10 is disposed on the non-skin side of the absorbent body 11, the liquid-permeable top sheet 12 disposed on the skin side of the absorbent body 11, and the absorbent body 11. It has a liquid-impermeable back sheet 13 and an exterior sheet 14 disposed on the non-skin side of the back sheet 13. The exterior sheet 14 is preferably a flexible sheet.

As shown in FIG. 2, the absorbent body 11 has an absorbent core 11A that absorbs and retains excreted fluid such as urine, and a liquid-permeable core wrap sheet 11B that covers the absorbent core 11A. Examples of the absorbent core 11A include those in which liquid absorbent fibers such as pulp containing a super absorbent polymer (SAP) are formed into a predetermined shape. The absorbent core 11A may not be covered with the core wrap sheet 11B.

Moreover, as shown in FIG. 2, the leg periphery elastic member 15 is provided in the both sides of the absorptive main body 10 in a horizontal direction, and the diaper 1 fits a wearer's leg periphery. For example, the leg-hole elastic member 15 is fixed in an elongated state in the longitudinal direction of the absorbent main body 10 between the exterior sheets 14 that are folded inward in the lateral direction to form two layers. Examples of the leg elastic member 15 include rubber thread and stretchable nonwoven fabric.

As shown in FIG. 3, the abdominal waistline portion 20 and the back waistline portion 30 include a first sheet 21, 31, a second sheet 22, 32, and a plurality of thread rubbers 23 that can be expanded and contracted in the lateral direction, respectively. 33. The plurality of rubber threads 23 and 33 are arranged side by side in the vertical direction between the first sheet 21 and 31 and the second sheet 22 and 32 and are fixed in an extended state in the horizontal direction. Therefore, the abdominal side waistline part 20 and the back side waistline part 30 expand and contract in the horizontal direction, and fit the wearer's waistline. As the thread rubbers 23 and 33, various known synthetic rubbers such as a styrene rubber, a urethane rubber, an ester rubber, polyurethane, and polyethylene can be applied in addition to the thread-like natural rubber.

In this embodiment, as a pants-type disposable diaper, the abdomen waistline 20 and the back waistline 30 are separated, so-called three-pieces having three members, the abdomen waistline 20, the back waistline 30, and the absorbent main body 10. Although the type was illustrated, it is not restricted to this. For example, the abdominal waistline 20 and the back waistline 30 are formed as one continuous member via the crotch, and the abdomen waistline 20 and the back waistline 30 are integrated with the exterior member. It may be a so-called two-piece type pants-type disposable diaper having two members of a sexable body.

=== Characteristics of the waist portions 20, 30 ===
FIG. 4A is a schematic cross-sectional view in which the waistline portion 40 of the comparative example is cut in the thickness direction, and FIG. 4B is a schematic cross-sectional view in which the waistline portion 20 of the present embodiment is cut in the thickness direction. FIG. 5 is an enlarged view of a cross-sectional view of the ventral waist part 20 shown in FIG.

Suppose that at least one waistline part of a pair of waistline parts 20 and 30 with which the diaper 1 of this embodiment is provided has the characteristic part demonstrated below. In the following, the ventral waistline 20 will be described as an example, but the backside waistline 30 may have a form that does not have the following features. Moreover, the form which both the ventral waist part 20 and the back waist part 30 have the following characteristic parts may be sufficient, the back side waist part 30 has the following characteristic parts, and the ventral waist part 20 has the following characteristic parts. It may be a form that does not have.

The ventral waist part 20 (hereinafter, also simply referred to as “the waist part 20”) includes the first sheet 21, the second sheet 22, and the plurality of thread rubbers 23 as described above. A part of the second sheet 22 is a non-skin side sheet portion 222 disposed on the non-skin side most in the waistline portion 20. And the part by which the edge part by the side of the waistline (of the non-skin side sheet | seat part 222) of the 2nd sheet | seat 22 in the vertical direction was turned back to the skin side from the absorptive main body 10 is the skin side sheet | seat part 221. The plurality of rubber threads 23 are disposed between the first sheet 21 and the non-skin side sheet portion 222 in the thickness direction.

The skin side sheet part 221 is fixed to the first sheet 21 and the absorbent main body 10 with an adhesive 50. The length in the vertical direction of the skin side sheet portion 221 is shorter than the length in the vertical direction of the non-skin side sheet portion 222, and the crotch side end portion of the skin side sheet portion 221 is the end portion on the waistline side of the absorbent main body 10. It should be long enough to cover By doing so, it can suppress that the skin side sheet | seat part 221 covers the absorptive main body 10 unnecessarily, and the area which can absorb the absorptive main body 10 is narrowed. Moreover, the edge part of the waistline side of the absorptive main body 10 can be covered with the skin side sheet | seat part 221, and the opening of the edge part of the absorptive main body 10 can be suppressed.

The first sheet 21 is disposed between the skin side sheet portion 221 and the thread rubber 23 in the thickness direction, and a part of the first sheet 21 is disposed on the waistline side from the absorbent main body 10 in the longitudinal direction. Has been. Accordingly, the first sheet 21 corresponds to the inner layer sheet portion. The first sheet 21 is fixed to the skin side sheet portion 221 and the absorbent main body 10 with an adhesive 50.

Moreover, since the skin side sheet part 221 touches a wearer's skin directly, it is set as a flexible sheet | seat with low bending rigidity. By doing so, since the skin side sheet | seat part 221 is smooth and becomes a soft and soft tactile sensation, the contact with a wearer can be improved.

Specifically, as a result of the trial by the inventor, it was found that the bending rigidity by the KES method of the skin side sheet portion 221 is preferably 0.0096 N · m ² / m × 10 ⁻⁴ or less. Generally, the waistline portion 20 of the diaper 1 is provided with a rubber thread 23 that can be expanded and contracted in the lateral direction so as to fit the waistline of the wearer. Since the waistline portion 20 is contracted in the lateral direction by the rubber thread 23, irregularities in the thickness direction are repeatedly formed in the waistline portion 20 in the lateral direction. This unevenness is long in the vertical direction, and it can be said that vertical gathers are formed in the waistline portion 20.

Therefore, if the bending rigidity of the skin side sheet portion 221 is larger than 0.0096 N · m ² / m × 10 ⁻⁴ and the skin side sheet portion 221 is a stiff sheet, as in the comparative example shown in FIG. 4A. The waistline 40 is formed with relatively large and uniform irregularities due to the shrinkage of the rubber thread 41. Moreover, the shape maintenance property (repellency) of the convex part 42 which protrudes to the skin side becomes high. Therefore, when the waistline part 40 contacts a wearer, the convex part 42 is hard to be crushed and the convex part 42 is easy to dig deeply into a wearer's skin. Therefore, it becomes easy for the wearer's skin to have vertical gather marks (pressure marks by the convex portions 42).

On the other hand, in this embodiment, the bending rigidity of the skin-side sheet portion 221 is 0.0096 N · m ² / m × 10 ⁻⁴ or less, and the skin-side sheet portion 221 has a high draping property and tends to sag slowly. And For this reason, as shown in FIG. 4B, the waist portion 20 of the present embodiment is formed with uneven unevenness with repeated fine undulations due to the shrinkage of the thread rubber 23. That is, the smoothness of the waistline portion 20 is good, and the contact area between the waistline portion 20 and the wearer's skin can be increased. Therefore, the contact pressure of the waistline portion 20 by the rubber thread 23 is dispersed, and the large convex portion 42 as in the comparative example shown in FIG. 4A can be prevented from locally contacting the wearer's skin. Moreover, the shape maintenance property (repulsiveness) of the convex part 26 also becomes low. Therefore, when the waist part 20 contacts a wearer, the convex part 26 is easy to be crushed and the convex part 26 is hard to bite into a wearer's skin. Therefore, it becomes difficult for the vertical lines to gather on the wearer's skin. In addition, the skin side sheet | seat part 221 should just be 0.0096N * m < ² > / m * 10 < ^-4 > or less at least one of the bending rigidity of a horizontal direction and the bending rigidity of a vertical direction, The bending stiffness in the lateral direction that has a great influence on the formation is preferably 0.0096 N · m ² / m × 10 ⁻⁴ or less, more preferably the bending stiffness in both directions is 0.0096 N · m ² / m × 10 ^−4. It may be the following.

However, when the bending rigidity of the skin side sheet portion 221 is as low as 0.0096 N · m ² / m × 10 ⁻⁴ or less, the cushioning property of the skin side sheet portion 221 is weak. Therefore, for example, when only the skin side sheet portion 221 is disposed on the skin side of the thread rubber 23, the linear pressure of the thread rubber 23 is not easily absorbed and relaxed by the skin side sheet portion 221. In addition, when the draping property of the skin side sheet portion 221 is high, the skin side sheet portion 221 is clung around the thread rubber 23, that is, in a state where the outline of the thread rubber 23 is raised on the skin side surface of the waistline portion 20. The waistline portion 20 comes into contact with the wearer's skin. If it does so, the linear pressure of the thread rubber 23 will be easily applied to a wearer's skin, and a rubber mark (pressure mark by the rubber thread 23) will be easily attached to a wearer's skin.

Particularly, since the absorbent main body 10 is not located on the skin side of the thread rubbers 23a to 23e (hereinafter also referred to as “trunk side thread rubber”) arranged on the waist side from the absorbent body 10, the waistline side rubber thread 23a. The mark of ~ 23e tends to stick to the wearer's skin. Moreover, the torso of an infant who is a person who wears the diaper 1 of the present embodiment often protrudes. For this reason, the waistline-side rubber threads 23a to 23e are likely to bite into the waistline of the babies and children, and rubber marks are likely to be formed on the waistline of the infants.

So, in this embodiment, it is between the skin side sheet | seat part 221 and the thread rubber 23 in the thickness direction of the waist part 20, and the inner layer sheet part 21 arrange | positioned at least one part to the waist part side rather than the absorptive main body 10. FIG. The bending stiffness by the KES method is made higher (larger) than the bending stiffness of the skin side sheet portion 221.

By doing so, the inner layer sheet portion 21 having a cushioning property higher than that of the skin side sheet portion 221 is arranged on the skin side of the waistline side rubber threads 23a to 23e, and the linear pressure of the waistline side rubber threads 23a to 23e is increased. Absorption is mitigated by the part 21. Further, since the inner layer sheet portion 21 is difficult to cling to the waistline-side thread rubbers 23a to 23e, the contours of the waistline-side thread rubbers 23a to 23e are unlikely to appear on the skin side surface of the waistline portion 20. Therefore, the waistline-side thread rubbers 23a to 23e are less likely to bite into the wearer's waistline, and the wearer's waistline is less likely to have rubber marks. The bending rigidity of at least one of the lateral direction and the longitudinal direction of the inner layer sheet portion 21 only needs to be higher than the bending rigidity of at least one of the lateral direction and the longitudinal direction of the skin side sheet portion 221.

In other words, according to the diaper 1 of the present embodiment, since it is difficult for the vertical gathers and the rubber marks to be formed around the wearer's waist, the infant's weak skin can be prevented from being damaged. Moreover, since the inner layer sheet part 21 is not located on the most skin side and the more flexible skin side sheet part 221 is located on the most skin side, the wearability to the wearer is also maintained.

The bending rigidity of the skin side sheet portion 221 is more preferably 0.007 N · m ² / m × 10 ⁻⁴ or less. Thereby, it becomes difficult to attach a vertical gather mark around a wearer's trunk. Further, the bending rigidity of the inner layer sheet 21 is higher than ^{0.0096N · m 2 / m × 10} -4, may more preferably in ^{0.015N · m 2 / m × 10} -4 or more. Alternatively, the bending rigidity of the inner layer sheet portion 21 is more than double the bending rigidity of the skin side sheet portion 221, or the difference between both bending rigidity is 0.005 N · m ² / m × 10 ⁻⁴ or more. Also good. This makes it more difficult for rubber marks to be attached to the wearer's waist.

Further, in the waistline portion 20 shown in FIG. 5, together with the second sheet 22 (non-skin side sheet portion 222), a part of the first sheet 21 that fixes the rubber thread 23 that is stretched in the lateral direction is sandwiched between the inner layers. The sheet portion 21 is used. Therefore, for example, as in a waistline portion 20 in FIG. 7 described later, the configuration is simplified compared to the case where a highly rigid inner layer sheet portion 24 is provided separately from the first sheet 21 and the second sheet 22 sandwiching the thread rubber 23. Can be

Moreover, in the waistline part 20 shown in FIG. 5, the part by which the edge part by the side of the waistline (of the non-skin side sheet | seat part 222) of the 2nd sheet | seat 22 in the vertical direction is turned back to the skin side becomes the skin side sheet | seat part 221. ing. For this reason, the non-skin side sheet portion 222 is also a flexible sheet having a flexural rigidity of 0.0096 N · m ² / m × 10 ⁻⁴ or less as in the case of the skin side sheet portion 221. Therefore, the skin contact of the waist part 20 on the non-skin side can be improved. In particular, in the case of the diaper 1 for infants, since parents of infants do not wear the diaper 1, it is difficult to realize the good skin contact of the waistline portion 20. Therefore, by improving the skin contact on the non-skin side of the waistline portion 20, an impression that the diaper 1 is a product with a good skin contact can be given to an infant guardian or the like.

However, it is not limited to the structure of the waist part 20 shown in FIG. For example, the skin side sheet part 221 and the non-skin side sheet part 222 may be formed of separate sheets. Further, the bending rigidity of the non-skin side sheet portion 222 is not limited to 0.0096 N · m ² / m × 10 ⁻⁴ or less.

The bending stiffness of the skin side sheet portion 221 and the inner layer sheet portion 21 can be measured by a KES method using a KES-FB2-AUTO-A bending measurement tester manufactured by Kato Tech Co., Ltd. Specifically, each of the skin side sheet portion 221 and the inner layer sheet portion 21 is cut into 10 cm × 10 cm to obtain samples. Next, each sample is fixed between the chucks of the measurement tester so that the transverse bending rigidity can be measured in each sample. Bending the front side up to maximum curvature + 2.5 cm ^-1, then undone after bending the back up of curvature -2.5 cm ^-1. The bending stiffness value is based on the average value of the inclination when the inclination of the bending moment with respect to the curvature becomes almost constant after starting to bend on the front side, and the inclination when the inclination of the bending moment with respect to the curvature becomes almost constant after starting to bend on the back side. calculate. Each sample is repeated 5 times, and the average value is defined as bending stiffness. It can measure similarly about the bending rigidity of the other sheet part mentioned below.

Here, in the waistline portion 20, a portion on the waistline side from the absorbent main body 10 in the vertical direction is a waistline side portion 20A, and a portion overlapping the absorbent main body 10 in the thickness direction is the absorbent main body side portion 20B. Further, in the absorbent main body side portion 20B, a portion overlapping the absorbent core 11A in the thickness direction is a core side portion 20D, and a portion between the waistline side portion 20A and the core side portion 20D in the vertical direction is an intermediate portion 20C. And

The value (F1 / L1) obtained by dividing the magnitude F1 of the force that extends the waistline side portion 20A by the unit length in the lateral direction by the length L1 in the longitudinal direction of the waistline side portion 20A is (F1 / L1). Is preferably smaller than the value (F2 / L2) obtained by dividing the magnitude F2 of the force that extends the length of the absorbent body by the unit length in the lateral direction by the longitudinal length L2 of the absorbent main body side portion 20B.

That is, it is preferable that the lateral stretching force per unit width in the longitudinal direction of the waistline side portion 20A is smaller than the lateral stretching force per unit width in the longitudinal direction of the absorbent main body side portion 20B. By doing so, it is possible to suppress tightening of the wearer's waist by the waistline side rubber threads 23a to 23e. Therefore, it is possible to make it difficult to attach rubber marks to the wearer's waist. On the other hand, the absorbent main body 10 can be firmly attached to the wearer by increasing the stretching force of the absorbent main body side portion 20B. Therefore, it is hard to produce a clearance gap between the absorptive main body 10 and a wearer, and it can suppress the leakage of excrement. Moreover, the drooping of the absorptive main body 10 which increased the weight by absorbing excretion can be suppressed, and the fitting property of the absorptive main body 10 can be maintained.

For example, when reducing the lateral stretching force, at least one of the following may be adjusted. That is, the fineness of the rubber thread 23 is reduced (the diameter is reduced), the expansion ratio of the rubber thread 23 is reduced, the effective length of the rubber thread 23 is shortened, and the thread per unit width in the longitudinal direction. This is to reduce the number of rubbers 23. The expansion ratio of the thread rubber 23 is the degree of elongation when the natural length of the thread rubber 23 is 1. The effective length of the thread rubber 23 is the length of the part where the thread rubber 23 develops elasticity, and is the length of the part where the thread rubber 23 is fixed to the sheet in the expanded state. On the other hand, when the lateral expansion / contraction force is increased, it may be adjusted in reverse.

Specifically, the fineness of the waistline side rubber threads 23a to 23e is about 200 to 1100 dtex, preferably about 300 to 1000 dtex. This is because if the fineness is smaller than 200 dtex, there is a possibility that the required stretchability cannot be exhibited. Because there is a fear. The pitch of the waistline side rubber threads 23a to 23e (the length between the centers of the thread rubbers 23 adjacent to each other in the longitudinal direction) is about 2.0 to 12.0 mm, preferably about 4.0 to 10.0 mm. Good. By doing so, it becomes difficult to make gather marks and rubber marks around the wearer's waist while fitting the waist part 20 to the wearer.

Further, the value (F3 / L3) obtained by dividing the magnitude F3 of the force that extends the intermediate portion 20C by the unit length in the horizontal direction by the vertical length L3 of the intermediate portion 20C (F3 / L3) is the largest, and the core side portion 20D is The value (F4 / L4) obtained by dividing the magnitude F4 of the force for extending the unit length in the direction by the longitudinal length L4 of the core side portion 20D (F4 / L4) is the next largest, and the waistline side portion 20A is the unit length in the lateral direction. It is preferable that the value (F1 / L1) obtained by dividing the magnitude F1 of the force to be expanded by the longitudinal length L1 of the waistline side portion 20A is the smallest.

By doing so, while suppressing the sagging of the absorbent main body 10 at the intermediate portion 20C, it is possible to prevent the waistline side portion 20A from being tightened and to prevent the core side portion 20D from being excessively contracted in the lateral direction. Therefore, the flatness of the absorbent core 11A can be maintained, and a gap is hardly generated between the absorbent main body 10 and the wearer, and excrement leakage can be suppressed.

It should be noted that a method of measuring the magnitudes F1 to F4 of the force for extending the portions 20A to 20D of the waistline portion 20 in the lateral direction by a unit length can be performed by a known method. For example, the target part is cut out from the diaper 1 as a sample. It is assumed that the sample includes all the effective length portions of the thread rubber 23 included in each portion 20A to 20D. Then, both ends of the sample corresponding to the lateral direction of the diaper 1 are sandwiched between chucks of a tensile tester such as an autograph (AGS-G100N) manufactured by SHIMADZU. Then, the load (N) obtained in a state where the sample is extended by separating the chucks by a unit length can be adopted as the magnitudes F1 to F4 of the force for extending the unit length in the lateral direction.

In addition, as shown in FIG. 5, in the longitudinal direction, an end 21 a on the waistline side of the inner layer sheet portion 21 is waistline more than the thread rubber 23 a disposed on the most waistline side among the plurality of thread rubbers 23 included in the waistline portion 20. It is preferably located on the side. Similarly, in the longitudinal direction, the crotch side end 21 b of the inner layer sheet portion 21 is preferably located on the crotch side with respect to the waistline side end 10 a of the absorbent main body 10.

By doing so, the inner layer sheet portion 21 can be provided on the skin side of more waistline side rubber threads 23a to 23e. Therefore, it is possible to make it difficult to leave more marks of the thread rubbers 23a to 23e around the wearer's waist.

As in the present embodiment (FIG. 5), the inner layer sheet portion 21 is preferably provided on the skin side of all the waistline side rubber threads 23a to 23e, but is not limited thereto. It is only necessary that the inner layer sheet portion 21 is provided between at least one of the waistline side rubber yarns 23 a to 23 e and the skin side sheet portion 221.

=== Modification of the waistline portion 20 ===
6 to 9 are cross-sectional views of modifications of the waistline portion 20.
The waistline portion 20 shown in FIG. 6 has the same configuration as that in FIG. 5, and the first sheet 21 fixed with the second rubber 22 (non-skin side sheet portion 222) and the rubber thread 23 sandwiched therebetween corresponds to the inner layer sheet portion 21. In addition, the bending rigidity of the first sheet 21 is higher than the bending rigidity of the skin side sheet portion 221. However, in FIG. 6, the end portion 212 on the waistline side of the inner layer sheet portion 21 in the vertical direction is also folded to the skin side together with the second sheet 22.

Therefore, the non-folded portion 211 and the folded portion 212 of the inner layer sheet portion 21 are arranged on the skin side of the waistline side rubber threads 23a to 23e. Therefore, the linear pressure of the waistline side rubber threads 23a to 23e is absorbed and relaxed by the two inner layer sheet portions 211 and 212. Therefore, the waistline-side thread rubbers 23a to 23e are less likely to bite into the wearer's waistline, and the rubber marks can be made harder to wear on the wearer's waistline.

In the waistline portion 20 shown in FIG. 7, as in FIG. 5, a part of the second sheet 22 is a non-skin side sheet portion 222, and a portion where the end portion on the waistline side of the second sheet 22 is folded back. It is a skin side sheet portion 221. However, in FIG. 7, the bending rigidity (the bending of at least one of the horizontal direction and the vertical direction) of the first sheet 21 fixed with the second sheet 22 (non-skin side sheet portion 222) sandwiched with the rubber thread 23. Rigidity) is set to 0.0096 N · m ² / m × 10 ⁻⁴ or less. That is, the 1st sheet | seat 21 is a flexible sheet | seat equivalent to the skin side sheet | seat part 221, and corresponds to a 2nd inner layer sheet | seat part.

Therefore, in the waistline portion 20 shown in FIG. 7, the inner layer sheet portion 24, which is a sheet different from the first sheet 21 and the second sheet 22, is disposed between the second inner layer sheet portion 21 and the skin side sheet portion 221. Has been. It is assumed that the bending rigidity of the inner layer sheet portion 24 is higher than the bending rigidity of the skin side sheet portion 221. Therefore, the inner layer sheet portion 24 can make it difficult for rubber marks to be attached to the wearer's skin.

7, the longitudinal length of the highly rigid inner layer sheet portion 24 can be made shorter than the longitudinal length of the first sheet 21. Specifically, it is preferable that the waistline side rubber threads 23a to 23e have such a length that can be covered from the skin side. Therefore, in the waistline part 20 shown in FIG. 7, compared with the waistline part 20 shown in FIG. 5, the range where the highly rigid inner layer sheet part 24 is arranged can be narrowed, and the flexibility of the waistline part 20 can be enhanced. .

In the waist part 20 shown in FIG. 8, the first sheet 21 and the second sheet 22 are closer to the skin side than the first sheet 21 fixed with the second rubber sheet 23 and the second sheet 22 (non-skin side sheet part 222) interposed therebetween. An inner layer sheet portion 25 that is another sheet is disposed. The bending rigidity of the inner layer sheet portion 25 is higher than the bending rigidity of the skin side sheet portion 221. The first sheet 21 corresponds to the third inner layer sheet portion 21.

In FIG. 8, the arrangement of the rubber thread 23 differs depending on the position in the vertical direction. Specifically, the waistline side rubber threads 23 a to 23 e are disposed between the inner layer sheet portion 25 and the third inner layer sheet portion 21 in the thickness direction. On the other hand, the core-side thread rubber 23f disposed in the core side portion 20D is disposed between the third inner layer sheet portion 21 and the non-skin side sheet portion 222 in the thickness direction. Similarly, the intermediate part rubber thread 23g arranged in the intermediate part 20C is also preferably arranged between the third inner layer sheet part 21 and the non-skin side sheet part 222 in the thickness direction.

In this case, since the waistline side rubber threads 23a to 23e are arranged on the skin side, they are less visible from the outside of the diaper 1 (from the non-skin side). Therefore, an impression that the waistline side portion 20A fits softly around the wearer's waistline can be given to the user. On the other hand, the core-side thread rubber 23f and the intermediate thread rubber 23g are more easily visible from the outside of the diaper 1 because they are arranged on the non-skin side. Therefore, the fit of the absorbent core 11A and the absorbent main body 10 by the rubber thread 23 is good, and an impression that does not leak easily can be given to the user.

Also, since the bending rigidity of the inner layer sheet portion 25 by the KES method is higher than the bending rigidity of the skin side sheet portion 221, it is possible to make it difficult to make rubber marks around the wearer's waist. In this case, in particular, the expansion / contraction force of the waistline side portion 20A (that is, the value obtained by dividing the magnitude of the force that stretches the waistline side portion 20A by the unit length in the lateral direction by the longitudinal length of the waistline side portion 20A). It is preferable to make it smaller than the other parts 20C and 20D. By doing so, the waistline-side thread rubbers 23a to 23e are positioned on the skin side, but it is possible to make it difficult for rubber marks to be attached to the wearer's waistline.

In addition, the rigidity of the 3rd inner layer sheet | seat part 21 may be higher than the bending rigidity of the skin side sheet part 221, and may be below the bending rigidity of the skin side sheet part 221. In addition, although not illustrated, a portion where the end portion on the waistline side of the first sheet 21 is folded may be the inner layer sheet portion (25), and a non-folded portion may be the third inner layer sheet portion (21).

In the waistline portion 20 shown in FIG. 9, the inner layer sheet portion 25 extends to the crotch side compared to the waistline portion 20 shown in FIG. 8, and the number of intermediate thread rubbers 23g located in the intermediate portion 20C is increased. Specifically, the intermediate thread rubber 23g is formed between the inner layer sheet portion 25 and the third inner layer sheet portion 21 in the thickness direction, and between the third inner layer sheet portion 21 and the non-skin side sheet portion 222 in the thickness direction. Between each other.

In this way, in the intermediate portion 20C, the elastic rubber 23g is arranged in the thickness direction so that the stretch force of the intermediate portion 20C is increased (that is, the force that extends the intermediate portion 20C by the unit length in the lateral direction). The value obtained by dividing the length by the length in the vertical direction of the intermediate portion 20C) can be made larger than the other portions 20A, 20D. By doing so, while suppressing the sagging of the absorbent main body 10 at the intermediate portion 20C, the tightening of the waistline side portion 20A can be prevented, and the core side portion 20D can be prevented from excessively contracting in the lateral direction. Therefore, the flatness of the absorbent core 11A can be maintained, and a gap is hardly generated between the absorbent main body 10 and the wearer, and excrement leakage can be suppressed.

Second Embodiment
=== Configuration of the pants-type disposable diaper 1 ===
FIG. 10 is a perspective view of the pants-type disposable diaper 1 (hereinafter “diaper”) according to the second embodiment. FIG. 11 is a plan view of the diaper 1 in the unfolded and extended state. 12 is a cross-sectional view taken along the line II in FIG. Hereinafter, about the structure of the diaper 1 of 2nd Embodiment, a different point from the diaper 1 of 1st Embodiment is mainly demonstrated.

As shown in FIG. 12, the ventral waist part 20 and the back waist part 30 in the diaper 1 of the second embodiment are expanded and contracted in the lateral direction with the first sheets 21 and 31, and the second sheets 22 and 32, respectively. A plurality of possible rubber bands 23, 33. The plurality of rubber threads 23 and 33 are arranged side by side in the vertical direction between the first sheet 21 and 31 and the second sheet 22 and 32 and are fixed in an extended state in the horizontal direction. Therefore, the abdominal side waistline part 20 and the back side waistline part 30 expand and contract in the horizontal direction, and fit the wearer's waistline. As the thread rubbers 23 and 33, various known synthetic rubbers such as a styrene rubber, a urethane rubber, an ester rubber, polyurethane, and polyethylene can be applied in addition to the thread-like natural rubber.

In the back waistline part 30, the rubber thread 33 is arranged from the upper end part to the lower end part. On the other hand, the rubber thread 23 is not disposed at the upper end portion of the abdominal side waist portion 20, but instead, a stretchable sheet 240 that is stretchable in the lateral direction is disposed. In the vertical direction, the stretchable sheet 240 and the thread rubber 23 may be overlapped or may be completely displaced.

Thus, by arranging the elastic sheet portion 240 without arranging the rubber thread 23 at the upper end portion of the abdominal side waistline portion 20, the upper end portion of the abdominal side waistline portion 20 is in close contact with the wearer. Therefore, local tightening can be suppressed, and the traces of the elastic member can be made difficult to remain. In particular, since the baby's abdomen is protruding, it is preferable to suppress tightening of the abdominal waist part 20.

Also, the stretchability of the upper end portions of the waistline portions 20 and 30 greatly affects the ease of expanding the waistline opening BH when the diaper 1 is worn. The stretchable sheet 240 has a property of being easily stretched from a natural state and difficult to shrink from the stretched state. Therefore, by disposing the stretchable sheet 240 on the upper end of the abdominal waistline portion 20, it becomes easier to widen the waistline opening BH when the diaper 1 is worn, and the abdomen after the waistline portion 20 is fitted to the wearer. Tightening can be prevented.

The stretchable sheet 240 has a polyurethane-based elastomer which is a thermoplastic elastomeric fiber having elasticity and a polypropylene (PP) of a polyolefin-based resin which is a thermoplastic resin fiber having inelasticity. Examples thereof include a nonwoven fabric subjected to various stretching treatments and a plastic film sheet having elasticity.

In addition, in the diaper 1 of this embodiment, although it is supposed that only the ventral waist part 20 has the elastic sheet 240, it is not restricted to this. Both the ventral waist part 20 and the back waist part 30 may have a stretchable sheet 240. The abdominal waistline part 20 does not have the stretchable sheet 240, and only the backside waistline part 30 has the stretchable sheet 240. The form which has this may be sufficient.

=== Characteristic part of the ventral waist part 20 ===
FIG. 13A is a schematic cross-sectional view showing the contracted state of the skin-side sheet portion 400 of the comparative example, and FIG. 13B is a schematic cross-sectional view showing the contracted state of the skin-side sheet portion 221 of the present embodiment. FIG. 14 is an enlarged view of a cross-sectional view of the ventral waist part 20 shown in FIG.

Suppose that at least one waistline part of a pair of waistline parts 20 and 30 with which the diaper 1 of this embodiment is provided has the characteristic part demonstrated below. In the following, the ventral waistline 20 will be described as an example, but the backside waistline 30 may have a form that does not have the following features. Moreover, the form which both the ventral waist part 20 and the back waist part 30 have the following characteristic parts may be sufficient, the back side waist part 30 has the following characteristic parts, and the ventral waist part 20 has the following characteristic parts. It may be a form that does not have.

The ventral waist part 20 (hereinafter, also simply referred to as “the waist part 20”) includes the first sheet 21, the second sheet 22, the plurality of thread rubbers 23, and the elastic sheet 240 as described above. . A part of the second sheet 22 is a non-skin side sheet portion 222 disposed on the non-skin side most in the waistline portion 20. And the edge part by the side of the waist of the 2nd sheet | seat 22 in the vertical direction is return | folded from the absorptive main body 10 to the skin side. The folded portion is a skin side sheet portion 221 disposed on the most skin side in the waistline portion 20.

The 1st sheet | seat 21 is arrange | positioned between the non-skin side sheet | seat part 222 and the absorptive main body 10 in the thickness direction. The plurality of rubber threads 23 are disposed between the non-skin side sheet portion 222 and the first sheet 21 in the thickness direction. The stretchable sheet 240 is disposed between the skin side sheet portion 221 and the absorbent main body 10 in the thickness direction. In addition, the materials adjacent in the thickness direction are joined by the adhesive 50 shown in FIG.

Since the skin side sheet portion 221 directly touches the wearer's skin in the waistline portion 20, the skin side sheet portion 221 is a flexible sheet having low bending rigidity. By doing so, the skin contact to the wearer of skin side sheet part 221 can be improved.

Specifically, as a result of the trial by the inventor, it was found that the bending rigidity by the KES method of the skin side sheet portion 221 is preferably 0.0096 N · m ² / m × 10 ⁻⁴ or less. Generally, the waist part 20 of the diaper 1 is provided with a stretchable member (stretchable sheet 240 or thread rubber 23) that stretches in the lateral direction so as to fit around the wearer's waistline. As a result of the waistline portion 20 being contracted in the lateral direction by the stretchable member, irregularities in the thickness direction are repeatedly formed in the waistline portion 20 in the lateral direction. This unevenness is long in the vertical direction, and it can be said that vertical gathers are formed in the waistline portion 20.

Therefore, as in the comparative example shown in FIG. 13A, the bending rigidity of the skin-side sheet portion 400 is temporarily greater than 0.0096 N · m ² / m × 10 ⁻⁴ , and the skin-side sheet portion 400 is a strong sheet. The skin-side sheet portion 400 is formed with relatively large and uniform irregularities due to the contraction of the elastic member. Moreover, the shape maintenance property (repellency) of the convex part 410 which protrudes to the skin side becomes high. Therefore, when the skin side sheet | seat part 400 contacts a wearer, the convex part 410 is hard to be crushed and the convex part 410 is easy to bite into a wearer's skin deeply. Therefore, it becomes easy for the wearer's skin to have vertical scars (pressure marks by the convex portions 410).

On the other hand, in this embodiment, the bending rigidity of the skin-side sheet portion 221 is 0.0096 N · m ² / m × 10 ⁻⁴ or less, and the skin-side sheet portion 221 has a high draping property and tends to sag slowly. And Therefore, as shown to FIG. 13B, the unevenness | corrugation which repeated fine undulation was formed in the skin side sheet | seat part 221 by shrinkage | contraction of an elastic member. That is, the smoothness of the skin side sheet portion 221 can be improved, and the contact area between the skin side sheet portion 221 and the wearer's skin can be increased. Therefore, the contact pressure of the skin side sheet part 221 by the elastic member is dispersed, and the large convex part 410 as in the comparative example shown in FIG. 13A can be prevented from locally contacting the wearer's skin. Moreover, the shape maintenance property (repulsiveness) of the convex part 250 which protrudes to the skin side also becomes low. Therefore, when the skin side sheet | seat part 221 contacts a wearer, the convex part 250 is easy to be crushed and the convex part 250 is hard to bite into a wearer's skin. Therefore, it becomes difficult for the vertical lines to gather on the wearer's skin. In addition, the skin side sheet | seat part 221 should just be 0.0096N * m < ² > / m * 10 < ^-4 > or less at least one of the bending rigidity of a horizontal direction and the bending rigidity of a vertical direction, The bending stiffness in the lateral direction that has a great influence on the formation is preferably 0.0096 N · m ² / m × 10 ⁻⁴ or less, more preferably the bending stiffness in both directions is 0.0096 N · m ² / m × 10 ^−4. It may be the following.

However, the end portion of the absorbent main body 10 in the longitudinal direction on the waistline side is relatively hard because a plurality of materials are laminated or an adhesive is applied. Therefore, the edge 10a on the waistline side of the absorbent main body 10 in the vertical direction (that is, the edge at the step between the portion where the absorbent main body 10 exists and the portion where the absorbent main body 10 does not exist) tends to bite into the wearer's skin. Moreover, although the unevenness | corrugation is formed in the edge 10a of the absorptive main body 10 by shrinkage | contraction of a stretchable member, since the convex part of the edge 10a of an absorptive main body is hard and is hard to be crushed, it is local on a wearer's skin. Easy to bite into. In particular, the torso of an infant who is a person who wears the diaper 1 of the present embodiment often protrudes easily, and the edge 10a of the absorbent main body 10 tends to bite into the torso of an infant with a protrusion.

In the waistline portion 20 shown in FIG. 14, the skin side sheet portion 221 is disposed across the edge 10 a of the absorbent main body 10 on the skin side of the absorbent main body 10. However, the bending rigidity of the skin side sheet portion 221 is as low as 0.0096 N · m ² / m × 10 ⁻⁴ or less, and the cushioning property of the skin side sheet portion 221 is low. Therefore, the hardness and level difference of the edge 10 a of the absorbent main body 10 are less likely to be absorbed and relaxed by the skin side sheet portion 221. Therefore, for example, when only the skin side sheet portion 221 is arranged on the skin side from the edge 10a of the absorbent main body 10, the edge 10a of the absorbent main body 10 bites into the skin of the wearer, and a mark is attached. There is a risk of damaging the skin of the wearer.

Therefore, in the diaper 1 of the present embodiment, the elastic sheet 240 is disposed as the inner layer sheet part on the non-skin side from the skin side sheet part 221, and the bending rigidity of the elastic sheet 240 by the KES method is set to the skin side sheet part 221. Increase (make larger) the bending stiffness. And the elastic sheet 240 is made to straddle the edge 10a by the side of the waist of the absorptive main body 10 in the vertical direction on the skin side of the absorptive main body 10. That is, the stretchable sheet 240 covers the edge 10a of the absorbent main body 10 from the skin side.

By doing so, the elastic sheet 240 having higher cushioning properties than the skin-side sheet portion 221 is disposed on the skin side from the edge 10 a of the absorbent main body 10, and the hardness and steps of the edge 10 a of the absorbent main body 10 are arranged. Is absorbed and relaxed by the elastic sheet 240. Therefore, it becomes difficult for the edge 10a of the absorbent main body 10 to bite into the wearer's skin, and can prevent the wearer's skin from being damaged by the edge 10a of the absorbent main body 10, and the skin on the skin side surface of the waistline portion 20 Winning is improved. In addition, the bending rigidity of at least one of the horizontal direction and the vertical direction of the elastic sheet 240 (inner layer sheet part) may be higher than the bending rigidity of at least one of the horizontal direction and the vertical direction of the skin side sheet part 221. Shall.

As described above, according to the diaper 1 of the present embodiment, since the vertical gather gather marks are difficult to be attached to the wearer's waist, and the edge 10a of the absorbent main body 10 is also difficult to be attached, the infant is weak. It can suppress hurting the skin. In addition, the elastic sheet 240 having a relatively high rigidity is not positioned on the most skin side, and the softer skin side sheet portion 221 is positioned on the most skin side, so that the wearability to the wearer is maintained. .

The bending rigidity of the skin side sheet portion 221 is more preferably 0.007 N · m ² / m × 10 ⁻⁴ or less. Thereby, it becomes difficult to attach a vertical gather mark around a wearer's trunk. Further, the inner layer sheet portion flexural rigidity (if stretchable sheet 240 in FIG. 14) is higher than ^{0.0096N · m 2 / m × 10} -4, more preferably ^{0.015N · m 2 / m × 10} -4 or more It is good to be. Alternatively, the bending rigidity of the inner layer sheet portion is more than double the bending rigidity of the skin side sheet portion 221, or the difference in bending rigidity between the two sheet portions is 0.005 N · m ² / m × 10 ⁻⁴ or more. May be. Thereby, a wearer's skin becomes hard to be damaged with the edge 10a of the absorptive main body 10. FIG.

Moreover, in the waistline part 20 shown in FIG. 14, the part by which the edge part by the side of the waistline (of the non-skin side sheet | seat part 222) of the 2nd sheet | seat 22 in the vertical direction turned back to the skin side became the skin side sheet | seat part 221. ing. For this reason, the non-skin side sheet portion 222 is also a flexible sheet having a flexural rigidity of 0.0096 N · m ² / m × 10 ⁻⁴ or less as in the case of the skin side sheet portion 221. Therefore, the skin contact of the waist part 20 on the non-skin side can be improved. In particular, in the case of the diaper 1 for infants, since parents of infants do not wear the diaper 1, it is difficult to realize the good skin contact of the waistline portion 20. Therefore, by improving the skin contact on the non-skin side of the waistline portion 20, an impression that the diaper 1 is a product with a good skin contact can be given to an infant guardian or the like.

However, it is not limited to the structure of the waist part 20 shown in FIG. For example, the skin side sheet part 221 and the non-skin side sheet part 222 may be formed of separate sheets. Further, the bending rigidity of the non-skin side sheet portion 222 is not limited to 0.0096 N · m ² / m × 10 ⁻⁴ or less. Also, the bending rigidity of the first sheet 21 is not particularly limited, and may be 0.0096 N · m ² / m × 10 ⁻⁴ or less or higher than 0.0096 N · m ² / m × 10 ^−4. Shall.

Further, in the waistline portion 20 illustrated in FIG. 14, the rubber thread 23 is disposed between the non-skin side sheet portion 222 and the first sheet 21, whereas the stretchable sheet 240 is disposed with the skin side sheet portion 221. It arrange | positions between the absorptive main bodies 10. FIG. Therefore, the hardness and level | step difference of the edge 10a of the absorptive main body 10 can be absorbed-relaxed using the elastic sheet 240 for making the waist part 20 contact | adhere to a wearer by a surface. Therefore, in the waistline portion 20 shown in FIG. 14, the configuration can be simplified compared to the case where a material that absorbs and relaxes the hardness and the step of the edge 10 a of the absorbent main body 10 is provided separately from the stretchable sheet 240. Yes.

Note that the measurement of the bending rigidity of the skin side sheet portion 221 and the inner layer sheet portion (elastic sheet 240) by the KES method can be performed using a KES-FB2-AUTO-A bending measurement tester manufactured by Kato Tech Co., Ltd. it can. Specifically, each of the skin side sheet portion 221 and the inner layer sheet portion is cut into 10 cm × 10 cm to obtain a sample. Next, each sample is fixed between the chucks of the measurement tester so that the transverse bending rigidity can be measured in each sample. Bending the front side up to maximum curvature + 2.5 cm ^-1, then undone after bending the back up of curvature -2.5 cm ^-1. The bending stiffness value is based on the average value of the inclination when the inclination of the bending moment with respect to the curvature becomes almost constant after starting to bend on the front side, and the inclination when the inclination of the bending moment with respect to the curvature becomes almost constant after starting to bend on the back side. calculate. Each sample is repeated 5 times, and the average value is defined as bending stiffness. It can measure similarly about the bending rigidity of the other sheet part mentioned below.

Further, in the longitudinal direction, the crotch side edge 240a of the stretchable sheet 240 is preferably located on the waistline side of the waistline side edge 11Aa of the absorbent core 11A. That is, it is preferable that the stretchable sheet 240 and the absorbent core 11A do not overlap in the thickness direction. By doing so, it can suppress that the absorptive core 11A shrink | contracts excessively in the horizontal direction by the elastic sheet 240, and can maintain the flatness of the absorptive core 11A. Therefore, it is hard to produce a clearance gap between the absorptive main body 10 and a wearer, and the leakage of excrement can be suppressed, and the fall of wearing comfort can be suppressed.

Moreover, although the bending rigidity of the skin side sheet | seat part 221 is low, the skin side sheet | seat part 221 is also arrange | positioned across the edge 10a of the absorptive main body 10 in the skin side of the absorptive main body 10 similarly to the elastic sheet 240. It is preferable that By doing so, the skin side sheet portion 221 and the stretchable sheet 240 can absorb the hardness and step of the edge 10 a of the absorbent main body 10. Therefore, compared with the case where only the elastic sheet 240 is arrange | positioned at the skin side of the edge 10a of the absorptive main body 10, it suppresses that a wearer's skin is damaged with the edge 10a of the absorptive main body 10 more. it can.

Further, in the vertical direction, the crotch side edge 221a of the skin side sheet portion 221 extends to the crotch side with respect to the crotch side edge 240a of the elastic sheet 240, so that the elastic sheet 240 is attached to the skin side sheet. It can be firmly fixed to the part 221. Therefore, curling of the elastic sheet 240 can be suppressed.

=== Modification of the waistline portion 20 ===
15 to 17 are cross-sectional views of modifications of the waistline portion 20.
In the waistline portion 20 shown in FIG. 15, as in FIG. 14, a part of the second sheet 22 is a non-skin side sheet portion 222, and a portion where the end portion on the waistline side of the second sheet 22 is folded back. It is a skin side sheet portion 221. However, in FIG. 15, the 1st sheet | seat 21 fixed on both sides of the thread rubber 23 with the 2nd sheet | seat 22 (non-skin side sheet | seat part 222) corresponds to an inner layer sheet | seat part, and the bending rigidity of the 1st sheet | seat 21 is skin side sheet | seat. The bending rigidity of the portion 221 is higher.

The inner layer sheet portion 21 (first sheet) is disposed on the skin side portion 211 where the end portion on the waistline side in the vertical direction is folded back to the skin side from the absorbent main body 10 and on the non-skin side from the skin side portion 211 A non-skin side portion 212. The skin side portion 211 of the inner layer sheet portion 21 is disposed on the skin side of the absorbent main body 10 so as to straddle the edge 10a on the waistline side of the absorbent main body 10 in the vertical direction. Therefore, the skin side portion 211 of the inner layer sheet portion 21 absorbs and relaxes the hardness and level difference of the edge 10a of the absorbent main body 10, and the wearer's skin is damaged by the edge 10a of the absorbent main body 10. Can be suppressed.

Further, the thread rubber 23 (elastic member) is disposed between the non-skin side portion 212 and the non-skin side sheet portion 22 of the inner layer sheet portion 21 in the thickness direction, whereas the elastic sheet 240 is provided. The (elastic sheet portion) is disposed between the skin side portion 211 and the non-skin side portion 212 of the inner layer sheet portion 21 in the thickness direction. In this case, the bending rigidity by the KES method of the elastic sheet 240 is made higher than the bending rigidity of the skin side sheet portion 221, and the elastic sheet 240 is positioned at the end of the absorbent main body 10 on the skin side of the absorbent main body 10. It is preferable to straddle the edge 10a.

By doing so, the hardness and level difference of the edge 10a of the absorbent main body 10 are absorbed and relaxed by the two-layered highly rigid sheet portion, that is, the skin side portion 211 of the inner layer sheet portion 21 and the stretchable sheet 240. Therefore, it can suppress more that a wearer's skin is damaged by the edge 10a of the absorptive main body 10. FIG.

However, when a plurality of sheet portions other than the skin-side sheet portion 221 are arranged on the skin side of the edge 10a of the absorbent main body 10 as shown in FIG. 15, the bending rigidity of at least one of the sheet portions is the skin side. What is necessary is just to be higher than the bending rigidity of the sheet | seat part 221. FIG. That is, in the waistline portion 20 of FIG. 15, the bending rigidity of the skin side portion 211 of the inner layer sheet portion 21 may be equal to or less than the bending rigidity of the skin side sheet portion 221. Moreover, the bending rigidity of the elastic sheet 240 may be equal to or less than the bending rigidity of the skin side sheet part 221, and in that case, the elastic property is provided between the non-skin side sheet part 222 and the non-skin side part 212 of the inner layer sheet part 21. A sheet 240 may be disposed.

Further, the absorbent core 11A is a thick member, and the rigidity of the absorbent core 11A is relatively high. Therefore, it is preferable that the edge 11 </ b> Aa on the waistline side of the absorbent core 11 </ b> A in the vertical direction does not reach the edge 10 a on the waistline side of the absorbent main body 10. When the absorbent core 11A is covered with the core wrap sheet 11B, it is preferable that the edge (not shown) on the waistline side of the core wrap sheet 11B does not reach the edge 10a of the absorbent main body 10. By doing so, it can suppress that the hardness and level | step difference in the edge 10a of the absorptive main body 10 increase with the absorptive core 11A or the core wrap sheet | seat 11B. Therefore, the edge 10a of the absorbent main body 10 can be made as soft as possible, and the edge 10a of the absorbent main body 10 can be prevented from damaging the wearer's skin.

Also, in the longitudinal direction, it is preferable that the crotch side edge 211a of the skin side portion 211 of the inner layer sheet portion 21 is located on the crotch side from the waist edge 11Aa of the absorbent core 11A. By doing so, the hardness and level | step difference of edge 11Aa of the absorptive core 11 are light-absorbed by the skin side part 211 of the inner layer sheet | seat part 21. FIG. Therefore, it can suppress that a wearer's skin is damaged by edge 11Aa of absorptive core 11A.

On the other hand, similarly to the waistline portion 20 shown in FIG. 14, in the longitudinal direction, the crotch side edge 240a of the elastic sheet 240 is located on the waistline side of the waistline side edge 11Aa of the absorbent core 11A. Is preferred. By doing so, it is possible to suppress the absorbent core 11A from being excessively contracted in the lateral direction by the elastic sheet 240, and the flatness of the absorbent core 11A can be maintained.

Further, the waistline portion 20 shown in FIGS. 16 and 17 is different from the waistline portion 20 shown in FIG. 15 in the length of the skin side sheet portion 221 in the vertical direction, but the other configurations are the same. As in the waistline portion 20 shown in FIG. 17, the crotch side end 221 a of the skin side sheet portion 221 may be located on the waistline side from the edge 10 a of the absorbent main body 10.

15 and 16, the skin side sheet portion 221 may be disposed across the edge 10a of the absorbent main body 10 on the skin side of the absorbent main body 10. In this case, although the bending rigidity of the skin side sheet part 221 is low, the hardness and level difference of the edge 10a of the absorbent main body 10 are also absorbed and relaxed by the skin side sheet part 221 together with the skin side part 211 of the inner layer sheet part 21. Is done. Therefore, it can suppress more that a wearer's skin is damaged by the edge 10a of the absorptive main body 10. FIG.

Further, in the waistline portion 20 shown in FIG. 15, the lengths in the vertical direction of the skin side sheet portion 221 and the skin side portion 211 of the inner layer sheet portion 21 are the same. On the other hand, in the waistline portion 20 shown in FIGS. 16 and 17, the length in the vertical direction of the skin side sheet portion 221 is shorter than the length in the vertical direction of the skin side portion 211 of the inner layer sheet portion 21. As described above, when the crotch side end 221a of the skin side sheet portion 221 and the crotch side end 211a of the skin side portion 211 of the inner layer sheet portion 21 are shifted in the vertical direction, a plurality of pieces as shown in FIG. The step at the crotch side end of each sheet part can be made smaller than when the crotch side end of the sheet part is coincident. Therefore, it can suppress that a wearer's skin is damaged by the end of the crotch side of each sheet part. In addition, since the number of stacked sheet portions changes one by one in the vertical direction, it is possible to reduce a sense of discomfort during wearing.

Similarly, in the longitudinal direction, the crotch side end 240a of the elastic sheet 240 is also shifted from the crotch side end 211a of the skin side portion 211 of the inner layer sheet portion 21 and the crotch side end 221a of the skin side sheet portion 221. It is good to have. By doing so, it can suppress that a wearer's skin is damaged by the end of the crotch side of each sheet part, and the uncomfortable feeling at the time of wear can be reduced.

In addition, when the crotch end of each sheet part is shifted, it is preferable that the crotch side end 211a of the skin side part 211 of the inner layer sheet part 21 is located on the crotch side in the longitudinal direction. By doing so, the skin side sheet part 221 and the elastic sheet 240 can be firmly fixed to the skin side part 211 of the inner layer sheet part 21. Therefore, the skin-side sheet portion 221 having low rigidity is positioned on the crotch side, the end portion on the crotch side of the skin-side sheet portion 221 is moved, or the stretchable sheet 240 is positioned on the crotch side. It can suppress that the edge part of the crotch side of 240 curls.

Although not shown, the stretchable sheet 240 is also configured to be positioned on the skin side and the non-skin side of the absorbent main body 10 with the end portions on the waistline side folded together with the first sheet 21 and the second sheet 22. May be. Further, in the case of the waistline portion 20 of FIGS. 15 to 17, the rubber thread 23 may be arranged at the upper end portion of the waistline portion 20 instead of the elastic sheet 240. Moreover, the elastic sheet 240 may be arrange | positioned not only at the upper end part of the waist part 20 but in another part or all.

=== About the flexibility of the skin-side sheet portion 221 of the first and second embodiments ===
As described above, the skin side sheet portion 221 has a high flexibility (drape property) in order to improve the skin contact of the waistline portion 20 to the wearer and to make it difficult for the vertical lines of the wearer's skin to be gathered. A sheet. Hereinafter, the structure of the skin side sheet | seat part 221 is demonstrated. The non-skin side sheet portion 222 preferably has the same flexibility.

The skin side sheet portion 221 is a fiber nonwoven fabric containing a thermoplastic synthetic resin, and is preferably a spunmelt fiber nonwoven fabric, particularly a spunbond fiber nonwoven fabric or an SMS (spunbond / meltblown / spunbond) fiber nonwoven fabric. . As the continuous fibers constituting these nonwoven fabrics, polyolefin-based thermoplastic fibers including polypropylene (PP) and polyethylene (PE), which are various known synthetic fibers, are preferably used. In this embodiment, a spunbond fiber nonwoven fabric mainly containing polyethylene fibers is used.

The skin-side sheet portion 221 is formed from a spun melt nonwoven fabric made of continuous fibers, so that the free ends of the fibers do not directly touch the wearer's skin unlike air-laid nonwoven fabrics including short fibers. In particular, when the wearer's fingertip touches, the free end of the fiber does not hit the fingerprint, and since it is a continuous fiber and has a high degree of freedom, it touches as if clinging to the fingerprint of the finger and is soft and good touch Can be given. In addition, unlike the case of using a composite fiber or the like, since a fiber defibrating step is not required, the number of manufacturing steps is small and manufacturing costs can be suppressed.

The skin-side sheet portion 221 is made of a spunbond non-woven fabric or SMS non-woven fabric composed of continuous fibers, so that there is no fluffing on the sheet surface compared to other synthetic fibers composed of short fibers, and smooth. Can give a soft and soft touch. Moreover, the spunbond fiber nonwoven fabric is easier to control the fiber orientation than other fiber nonwoven fabrics. Therefore, it is possible to obtain a well-balanced composite waistline portion 20 having desired sheet tensile strength and elongation.

The skin-side sheet portion 221 is a fiber nonwoven fabric mainly containing polyethylene fibers, and the content of polyethylene fibers with respect to the entire sheet is 70 to 100% by mass. Since the polyethylene fiber is softer than other thermoplastic resin fibers such as polypropylene fiber and PET (polyethylene terephthalate) fiber, the polyethylene fiber content is at least 70% by mass. Compared to a conventional nonwoven fabric of 70% by mass or less, it is excellent in flexibility. Further, since the polyethylene fiber has a relatively large fiber diameter, the fiber gap is relatively large and the air permeability is excellent. Therefore, the steaming of the waistline portion 20 can also be suppressed.

When the skin-side sheet portion 221 is formed from a spunbonded nonwoven fabric using continuous polyethylene fibers, the continuous fibers have a plurality of fused portions that are thermally fused to each other by a heat treatment by a calendar embossing method. In the fusion part, each constituent fiber is heat-sealed and the fiber shape is not maintained, and a part is formed into a film, and the rigidity is higher than that of the non-fusion part of each constituent fiber.

The total area ratio of the fused portion relative to the area of the skin-side sheet portion 221 is related to the texture and sheet strength of the sheet. From this viewpoint, the total area ratio of the fused portion may be 5% or more and 25% or less. preferable. If the total area ratio is less than 5%, the strength of the sheet may be reduced, and part of the waistline portion 20 may be torn during wearing. On the other hand, if the total area ratio exceeds 25%, the sheet May become hard as a whole, and the texture may be impaired.

Moreover, about the softness | flexibility (specifically, "smoothness" and "soft and soft tactile sense") of the skin side sheet part 221, the surface characteristic in a skin side sheet part 221, a bending characteristic, a fiber density, a fiber diameter, It can be confirmed by specific volume, compression characteristics and the like.

The basis weight (mass per unit area) of the skin-side sheet portion 221 is 10 g / m ² or more and 30 g / m ² or less, preferably 12 g / m ² or more and 25 g / m ² or less. The thickness dimension under a slight load (0.49 hPa) is preferably 0.10 mm or more and 0.60 mm or less. When the basis weight of the skin side sheet portion 221 is less than 10 g / m ² , it becomes difficult to obtain sufficient tensile strength although it is excellent in flexibility, and when the basis weight exceeds 30 g / m ² , Although relatively high tensile strength can be obtained, sufficient flexibility cannot be obtained.

The apparent density of the skin-side sheet portion 221 under a load of 0.49 hPa (≈0.5 gf / cm ² ) is 0.02 g / cm ³ or more and 0.1 g / cm ³ or less, preferably 0.04 g / cm ³ or more. 0.08 g / cm ³ may by mass or less, an apparent density under 49.03hPa load, 0.1 g / cm ³ or more 0.2 g / cm ³ or less, preferably, 0.12 g / cm ³ or more 0.18g / Cm ³ or less. The specific volume of the skin-side sheet portion 221 under a load of 0.49 hPa is preferably 10 cm ³ / g or more and 50 cm ³ / g or less, and preferably 12.0 cm ³ / g or more and 18.0 cm ³ / g or less. well with it, the specific volume under 49.03hPa load 5.0 cm ³ / g or more 10 cm ³ / g, preferably not more than 4.0 cm ³ / g or more 8.0 cm ³ / g.

When the apparent density under the load of 0.49 hPa of the skin-side sheet portion 221 is less than 0.02 g / cm ³ , there is a possibility that the fusing portion of the skin-side sheet portion 221 is reduced and the fluff is likely to occur. On the other hand, when the apparent density under the load of 0.49 hPa exceeds 0.1 g / cm ³ , the rigidity of the skin side sheet portion 221 becomes relatively high.

When the skin-side sheet portion 221 has a specific volume under a load of 49.03 hPa (≈50 gf / cm ² ) and is pressed by the fingertip and the fibers are compressed, the skin-side sheet portion 221 is easily crushed and relatively repulsive. Therefore, the contact area between the fingertip and the fiber is relatively large, and the fiber is likely to cling to the fingertip, giving a soft touch and less likely to be gathered.

The basis weight of the skin side sheet part 221 was measured based on the JISL1096 method. The apparent density was determined from the average value (N = 3) calculated from the basis weight and thickness dimension obtained by these measurements. The specific volume of the skin side sheet part 221 was calculated by dividing the basis weight of the nonwoven fabric by its thickness.

The average fiber diameter of the constituent fibers (mainly polyethylene fibers) of the skin side sheet portion 221 is 14 μm or more and 22 μm or less. Since the fiber diameter is relatively large, the total area ratio of the fused portion with respect to the area of the skin-side sheet portion 221 is relatively small, and the bending rigidity of the skin-side sheet portion 221 can be lowered.

<Bending characteristics>
As described above, the bending rigidity of the skin-side sheet portion 221 by the KES method is set to 0.0096 N · m ² / m × 10 ⁻⁴ or less. Thereby, the fiber is easily bent, the contact distance between the fiber and the fingertip that touches the fiber is increased, and the friction coefficient MIU is increased. However, the bending rigidity based on the KES method of the skin side sheet portion 221 is preferably 0.0035 N · m ² / m × 10 ⁻⁴ or more. When the bending rigidity is less than 0.0035 N · m ² / m × 10 ⁻⁴ , the tensile strength of the skin-side sheet portion 221 is lowered, and a part of the waistline portion 20 may be broken during wearing. As a result, when the coefficient of variation MMD / MIU × 100 of the friction coefficient is 2% or more and 6% or less, the variation in the friction coefficient becomes small and smooth. That is, a smooth tactile sensation can be realized by increasing the number of fibers clinging to the fingertip.

<Compression characteristics>
Compression work amount based on KES method skin side sheet portion 221 WC is 0.14N · m / m ² or more 0.2N · m / m ² or less, the compression recovery rate RC may When it is less than 50% to 15%. When the compression work WC is larger than 0.2 N · m / m ² , the convex portions 26 and 250 formed by the contraction of the waistline portion 20 are difficult to be crushed when the waistline portion 20 comes into contact with the wearer. It is because it becomes easy to bite into a person's skin. Further, when the compression recovery rate RC is greater than 50%, when the waistline portion 20 comes into contact with the wearer, the force that the crushed convex portions 26, 250 try to return to the original is strong, This is because the local contact pressure of the convex portions 26 and 250 is increased. On the contrary, if the compression work WC is less than 0.14 N · m / m ² or the compression recovery rate RC is less than 15%, the rigidity of the waistline portion 20 is too low, and the waistline portion 20 is worn during wearing. May break. Therefore, by making the compression work WC and the compression recovery rate RC of the skin side sheet portion 221 within the above ranges, it is difficult to make gather marks around the wearer's waist while appropriately obtaining the tensile strength of the waist portion 20. Can do.

<Surface characteristics>
The skin-side sheet portion 221 is a fiber web formed by heat-sealing continuous fibers mainly composed of polyethylene fibers, and since the free ends of the fibers do not exist on the surface, there is little fuzzing and the sheet surface is good It can be said that it has smoothness. In addition, since polyethylene fibers are more flexible than polypropylene fibers, the surface is superior in flexibility, and when the wearer's body moves due to deformation even under a slight load, it softly follows and fits the movement. can do.

The surface of the skin side sheet portion 221 has a friction coefficient MIU of 0.15 or more and 0.40 or less, preferably 0.25 or more and 0.35 or less, and an average deviation MMD of the friction coefficient of 0.008 or more and 0.01 or less. is there. Since the friction coefficient MIU exceeds 0.15, the frictional resistance is relatively high, and when the wearer touches the sheet surface, a smooth tactile feeling that clings to the skin can be given. The coefficient of variation MMD / MIU × 100 of the friction coefficient is 2.0% or more and 6.0% or less. As described above, when the compression recovery rate RC is less than 50%, the fiber is crushed and the fiber density is increased even under a slight load when the wearer's fingertip touches, and the amount of fiber in contact with the fingertip increases. As a result, the friction coefficient MIU increases. As a result, since the coefficient of variation MMD / MIU × 100 (%) of the friction coefficient is within a relatively small predetermined value range, the variation of the friction coefficient is reduced, and the overall smoothness is good. The number of fibers that come into contact with the fingertips of the fingertips is relatively large so that a smooth, soft and soft touch can be provided.

The range of the predetermined value of the bending characteristic and the surface characteristic in the skin side sheet part 221 may be satisfied in at least one of the horizontal direction or the vertical direction of the waistline part 20, and preferably in both. In addition, regarding each mechanical measurement based on the KES method of this specification, “Standardization and analysis of texture evaluation” second edition (Japan Textile Machinery Society, Texture Measurement and Standardization Research Committee, July 10, 1980) Details).

Table 1 shows the results of manufacturing a plurality of nonwoven fabrics under various conditions and evaluating their characteristics and performance. The nonwoven fabrics of Examples 1 to 5 are formed of a spunbond nonwoven fabric containing 100% by mass of polyethylene fibers that are continuous fibers, and the nonwoven fabric of Comparative Example 1 is made of a spunbond nonwoven fabric that contains 100% by mass of polypropylene fibers that are continuous fibers. . Further, the nonwoven fabrics of Examples 1 to 5 and Comparative Examples 1 and 2 were subjected to a calendering-type heat treatment with a hot embossing roll in the production process.

The diaper 1 in which the non-woven fabrics of Examples 1 to 5 and Comparative Examples 1 to 3 were each skin-side sheet portions 221 were allowed to be worn by an infant on the test subject in two stages with respect to the ease of gather marks and tensile strength. evaluated. Based on the skin of the infant after wearing, the test subject felt that “gather marks were not easily attached” as “◯”, and the test subject felt that “gather marks were easily attached” as “x”. As for the tensile strength, the case where the waistline portion 20 was broken during wearing was designated as “◯”, and the case where it was not broken was designated as “x”.

<Example 1>
As the nonwoven fabric of Example 1, a spunbonded nonwoven fabric composed of polyethylene fibers having a basis weight of 20.40 g / m ² and an average fiber diameter of 14.83 μm was used.

<Example 2>
As the nonwoven fabric of Example 2, a spunbond nonwoven fabric composed of polyethylene fibers having a basis weight of 18.98 g / m ² and an average fiber diameter of 16.89 μm was used.

<Example 3>
As the nonwoven fabric of Example 3, a spunbond nonwoven fabric composed of polyethylene fibers having a basis weight of 20.84 g / m ² and an average fiber diameter of 20.28 μm was used.

<Example 4>
As the nonwoven fabric of Example 4, a spunbonded nonwoven fabric composed of polyethylene fibers having a basis weight of 25.12 g / m ² and an average fiber diameter of 16.77 μm was used.

<Example 5>
As a nonwoven fabric of Example 5, a spunbond nonwoven fabric composed of polyethylene fibers having a basis weight of 15.14 g / m ² and an average fiber diameter of 16.77 μm was used.

<Comparative Example 1>
As the nonwoven fabric of Comparative Example 1, a spunbonded nonwoven fabric composed of polypropylene fibers having a basis weight of 20.37 g / m ² and an average fiber diameter of 12.19 μm was used.

<Comparative example 2>
As the nonwoven fabric of Comparative Example 2, a spunbonded nonwoven fabric composed of a composite fiber having a basis weight of 15.08 g / m ² and an average fiber diameter of 17.35 μm was used. The composite fiber was a continuous fiber, and a core-sheath type composite fiber having a core part made of polypropylene and a sheath part made of polyethylene was used.

<Comparative Example 3>
As the nonwoven fabric of Comparative Example 3, an air-through nonwoven fabric having a basis weight of 23.52 g / m ² and composed of a composite fiber having an average fiber diameter of 16.64 μm was used. As the composite fiber, a core-sheath type composite fiber having a fiber length of 51 mm and having a core part made of polyethylene terephthalate (PET) and a sheath part made of polyethylene was used.

The following methods were used for measuring the basis weight, fiber diameter, surface characteristics (MIU, MMD, MMD / MIU), bending characteristics (B), and compression characteristics (T0, Tm, WC, RC) of each nonwoven fabric. .

<Measurement method of basis weight>
Samples (N = 10) of 100 mm × 200 mm were obtained from each nonwoven fabric, the basis weights of those samples were determined, and the average value was taken as the basis weight of each nonwoven fabric.

<Measurement method of average fiber diameter>
A 10 mm × 10 mm sample was cut out from each nonwoven fabric, prepared, and placed on the slide. Next, an appropriate amount of glycerin was dropped onto each sample so that the entire sample was immersed in glycerin, and a cover glass was placed thereon. Next, the surface of the sample sheet is observed at a magnification of 1000 using a known optical microscope (for example, VHC-100 Digital Microscope Lens VH-Z450 manufactured by KEYENCE), and fibers exposed on the sheet surface (N = 50). ) Was measured, and the average value was defined as the average fiber diameter.

<Measurement method of surface characteristics>
Surface properties are measured using a KES-FB4-A-AUTO (automated surface testing machine) manufactured by Kato Tech Co., Ltd., and a 100 mm x 100 mm area of each non-woven fabric is sampled and placed on a smooth metal flat test bench. I went there. Each sample is moved horizontally at a constant speed of 0.1 cm / sec by 0 to 2 cm in the machine direction (direction in which the fibers are oriented) during production of each nonwoven fabric, and a friction element (measuring element) having an outer dimension of 5 mm × 5 mm is used. Then, under the condition of an initial load of 50 gf, each numerical value was calculated with the average friction coefficient in the moving section as MIU and the standard deviation of the friction coefficient at that time as MMD. The same measurement was performed five times for each sample, and the average was used as the MIU and MMD values of each sample.

<Method of measuring thickness dimensions T0, Tm and compression characteristics>
A KES-FB3-AUTO-A compression tester manufactured by Kato Tech Co., Ltd. was used to measure the thickness dimension of each nonwoven fabric. First, each non-woven fabric was cut into a size of 100 mm × 100 mm to make a sample, and the sample was gently sandwiched between the upper and lower disks, and each sample under a compression area (disk area) of 2.0 cm ² and a load of 0.49 hPa. The thickness dimension T0 is measured. Next, the measurement sample was compressed at a pressurization rate of 0.02 mm / second until the load was 49.03 hPa, and the thickness dimension Tm under the load of 49.03 hPa was measured. Also, the work amount (N · m / m ² ) required for compression from the thickness dimension T0 to the thickness dimension Tm is WC, and the work amount required for restoration from the thickness dimension Tm to the thickness dimension T0 is WC2. The compression recovery rate RC (%) was determined based on the following formula.
RC (%) = WC2 / WC × 100

<Measurement results>
From the results of Table 1, when the bending stiffness of the nonwoven fabric is larger than 0.0096 N · m ² / m × 10 ⁻⁴ as in Comparative Examples 1 to 3, the wearer's skin is likely to have gather marks, and Example 1 When it is 0.0096 N · m ² / m × 10 ⁻⁴ or less as in 5-5, it can be said that gather marks are not easily attached to the wearer's skin. Moreover, if bending rigidity is 0.0035N * m < ² > / m * 10 < ^-4 > or more like Example 5, the waist part 20 will not fracture | rupture during wear, and the nonwoven fabric of Example 5 will be a skin side sheet | seat part. It can be said that 221 can be used without any problem.

Further, the nonwoven fabrics of Examples 1 to 5 have a lower compression recovery rate RC than the nonwoven fabrics of Comparative Examples 1 to 3, and are 50% or less. Also from this point, it can be seen that in a non-woven fabric having low bending rigidity and flexibility, the convex portions in the gathers are easily crushed, and the gather marks are difficult to be attached.

The nonwoven fabrics of Examples 1 to 5 have a basis weight in the range of 10 g / m ^{2 to} 30 g / m ² and an apparent density at a load of 49.03 hPa of 0.12 g / cm ^{3 to} 0.2 g / m. It is within the range of cm ³ or less. Therefore, it can be seen that if the basis weight and apparent density of the nonwoven fabric are within the above ranges, flexibility can be obtained while obtaining an appropriate tensile strength.

Further, when Example 1 (nonwoven fabric composed of polyethylene fibers having a fiber diameter of 14.83 μm) and Comparative Example 1 (nonwoven fabric composed of polypropylene fibers having a fiber diameter of 12.19 μm) were compared, the MIU of Example 1 was compared. Is 0.335, while the MIU of Comparative Example 1 is 0.238, and the coefficient of friction coefficient MMD / MIU × 100 of Example 1 is 2.57%. The coefficient of variation MMD / MIU × 100 of the friction coefficient in Example 1 was 3.28%. From this, the non-woven fabric is made of a relatively flexible polyethylene fiber, so that the friction coefficient MIU becomes relatively high. As a result, the coefficient of variation MMD / MIU × 100 of the friction coefficient becomes low and the friction coefficient varies. It becomes small and it can be said that the sheet surface is smooth. Accordingly, when the user moves the fingertip in the plane direction with respect to the surface of the nonwoven fabric, the amount of fibers that come into contact with the fingerprint is relatively large, and a smooth tactile sensation can be provided.

Further, in the nonwoven fabrics of Comparative Examples 2 and 3 composed of the composite fiber, the coefficient of variation MMD / MIU × 100 of the friction coefficient exceeds 6%. For this reason, it can be said that the sheet surface is inferior in smoothness as compared with the nonwoven fabrics of Examples 1 to 5 composed of single fibers of polyethylene fibers. Conversely, according to the nonwoven fabrics of Examples 1 to 5 made of polyethylene fibers having a fiber diameter of 14 μm or more and 22 μm or less, the coefficient of variation MMD / MIU × 100 of the friction coefficient by the KES method is 2% or more and 6% or less. It can be seen that a flexible nonwoven fabric having a smooth sheet surface can be easily obtained. In addition, since the measurement results of the friction coefficient MIU in Examples 1, 2, 4, and 5 are 0.268 to 0.335, the friction coefficient MIU is preferably at least 0.25 (or more).

As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof.

1 pants-type disposable diapers (absorbent articles),
10 Absorbent body,
11 Absorber, 11A Absorbent core, 11B Core wrap sheet,
12 top sheet, 13 back sheet, 14 exterior sheet,
15 leg elastic member,
20 Ventral waistline (trunk),
20A waistline side, 20B absorbent main body side,
20C intermediate part, 20D core side part,
21 1st sheet (inner layer sheet part, 2nd inner layer sheet part, 3rd inner layer sheet part),
22 second sheet, 221 skin side sheet part, 222 non-skin side sheet part,
23 rubber thread (elastic member), 23a-23e rubber thread on the waistline side,
23f Core side rubber thread, 23g Intermediate thread rubber,
24 inner layer sheet part, 25 inner layer sheet part, 26 convex part 30 back side waistline part (trunk part), 31 1st sheet,
32 2nd sheet, 33 rubber thread,
40 waist part of comparative example,
50 adhesives,
240 elastic sheet (elastic sheet part, inner layer sheet part), 250 convex part 400 skin side sheet part of comparative example,

Claims (30)

1. Having a vertical direction and a horizontal direction,
   An absorbent main body comprising an absorbent core, and a pair of waistline portions,
   The waistline portion is an absorbent article including a skin side sheet portion arranged on the most skin side, and a plurality of thread rubbers that can be expanded and contracted in the lateral direction,
   In at least one waistline portion of the pair of waistline portions,
   The bending stiffness by the KES method of the skin side sheet portion is 0.0096 N · m ² / m × 10 ⁻⁴ or less,
   Between the skin side sheet portion and the rubber thread in the thickness direction of the waistline portion, on the waistline side from the absorbent main body in the longitudinal direction, and having an inner layer sheet portion,
   The absorbent article, wherein the inner layer sheet portion has a bending stiffness by the KES method higher than the bending stiffness of the skin side sheet portion.
2. The absorbent article according to claim 1,
   The waistline portion includes a non-skin side sheet portion disposed on the most non-skin side,
   The rubber thread is disposed between the inner layer sheet portion and the non-skin side sheet portion in the thickness direction,
   The said skin side sheet | seat part is the part by which the edge part of the trunk periphery side of the said non-skin side sheet | seat part in the said vertical direction was turned back to the skin side.
3. The absorbent article according to claim 2,
   An absorbent article, wherein an end portion on the waistline side of the inner layer sheet portion in the longitudinal direction is also folded back to the skin side.
4. The absorbent article according to claim 1,
   The waistline portion includes a second inner layer sheet portion disposed on the non-skin side from the inner layer sheet portion, and a non-skin side sheet portion disposed on the most non-skin side,
   The bending stiffness by the KES method of the second inner layer sheet portion is 0.0096 N · m ² / m × 10 ⁻⁴ or less,
   The rubber thread is disposed between the second inner layer sheet portion and the non-skin side sheet portion in the thickness direction,
   The said skin side sheet | seat part is the part by which the edge part of the trunk periphery side of the said non-skin side sheet | seat part in the said vertical direction was turned back to the skin side.
5. The absorbent article according to claim 1,
   The waistline is
   A third inner layer sheet portion disposed on the non-skin side from the inner layer sheet portion, and a non-skin side sheet portion disposed on the most non-skin side, and
   In the longitudinal direction, it has a waistline side portion on the waistline side from the absorbent main body, and a core side portion that overlaps the absorbent core in the thickness direction,
   The plurality of thread rubbers includes a waistline side rubber thread disposed on the waistline side part, and a core side thread rubber disposed on the core side part,
   The waistline side rubber thread is disposed between the inner layer sheet portion and the third inner layer sheet portion in the thickness direction,
   The absorbent article according to claim 1, wherein the core-side thread rubber is disposed between the third inner layer sheet portion and the non-skin side sheet portion in the thickness direction.
6. The absorbent article according to claim 5,
   The waistline portion has an intermediate portion between the waistline side portion and the core side portion in the longitudinal direction,
   The plurality of thread rubbers include an intermediate thread rubber disposed in the intermediate part,
   The intermediate thread rubber is between the inner layer sheet portion and the third inner layer sheet portion in the thickness direction, and between the third inner layer sheet portion and the non-skin side sheet portion in the thickness direction. Each of the absorbent articles is characterized by being arranged.
7. The absorbent article according to any one of claims 1 to 6,
   The waistline portion has a waistline side portion on the waistline side from the absorbent main body in the longitudinal direction, and an absorbent main body side portion that overlaps the absorbent main body in the thickness direction,
   A value obtained by dividing the magnitude of the force for extending the waistline side portion by the unit length in the lateral direction by the length in the longitudinal direction of the waistline side portion is a unit length of the absorbent main body side portion in the lateral direction. An absorbent article characterized in that it is smaller than the value obtained by dividing the magnitude of the force to extend by the length in the longitudinal direction of the side part of the absorbent main body.
8. The absorbent article according to any one of claims 1 to 7,
   In the longitudinal direction, an end on the waistline side of the inner layer sheet portion is located closer to the waistline side than the thread rubber disposed on the most waistline side among the plurality of thread rubbers. .
9. The absorbent article according to any one of claims 1 to 8,
   In the longitudinal direction, an end on the crotch side of the inner layer sheet portion is located on the crotch side than an end on the waistline side of the absorbent main body.
10. The absorbent article according to any one of claims 1 to 9,
    The absorbent article, wherein the skin side sheet portion has a flexural rigidity of 0.0035 N · m ² / m × 10 ⁻⁴ or more by the KES method.
11. The absorbent article according to any one of claims 1 to 10,
    An absorbent article having a compression recovery rate RC of 15% or more and 50% or less by the KES method of the skin side sheet part.
12. The absorbent article according to any one of claims 1 to 11,
    The basis weight of the skin-side sheet portion is 10 g / m ² or more and 30 g / m ² or less, and the apparent density at a load of 49.03 hPa is 0.12 g / cm ³ or more and 0.2 g / cm ³ or less. Absorbent article.
13. The absorbent article according to any one of claims 1 to 12,
    The said skin side sheet | seat part contains the fiber whose fiber diameter is 14 micrometers or more and 22 micrometers or less, and the coefficient of variation MMD / MIUx100 of the friction coefficient by KES method is 2% or more and 6% or less, The absorbent article characterized by the above-mentioned.
14. The absorbent article according to any one of claims 1 to 13,
    An absorbent article, wherein the skin-side sheet portion has a friction coefficient MIU of at least 0.25.
15. The absorbent article according to any one of claims 1 to 14,
    The said skin side sheet | seat part contains polyethylene fiber, The absorbent article characterized by the above-mentioned.
16. Having a vertical direction and a horizontal direction,
    An absorbent main body comprising an absorbent core, and a pair of waistline portions,
    The waistline part is an absorbent article including a skin side sheet portion arranged on the most skin side,
    In at least one waistline portion of the pair of waistline portions,
    The bending stiffness by the KES method of the skin side sheet portion is 0.0096 N · m ² / m × 10 ⁻⁴ or less,
    An inner layer sheet portion is arranged on the non-skin side from the skin side sheet portion,
    The bending stiffness by the KES method of the inner layer sheet portion is higher than the bending stiffness of the skin side sheet portion,
    The absorbent article according to claim 1, wherein the inner layer sheet portion is disposed on the skin side of the absorbent main body so as to straddle the edge of the absorbent main body on the waistline side in the longitudinal direction.
17. The absorbent article according to claim 16, wherein
    The waistline portion includes a non-skin side sheet portion disposed on the most non-skin side,
    The skin side sheet portion is a portion where the end portion on the waistline side of the non-skin side sheet portion in the longitudinal direction is folded back to the skin side,
    The inner layer sheet portion has a skin side portion that is a portion where an end on the waistline side in the vertical direction is folded back to the skin side, and a non-skin side portion that is disposed on the non-skin side from the skin side portion. ,
    Between the non-skin side portion and the non-skin side sheet portion of the inner layer sheet portion in the thickness direction of the waistline portion, a stretchable member that can be stretched in the lateral direction is disposed,
    The absorbent article, wherein the skin side portion of the inner layer sheet portion is disposed across the edge of the absorbent main body in the longitudinal direction on the skin side of the absorbent main body.
18. The absorbent article according to claim 17,
    In the longitudinal direction, the crotch side edge of the skin side part of the inner layer sheet part is located on the crotch side from the girth side edge of the absorbent core.
19. The absorbent article according to claim 17 or 18,
    Between the skin side portion and the non-skin side portion of the inner layer sheet portion in the thickness direction of the waistline portion, a stretchable sheet portion that is stretchable in the lateral direction is disposed,
    The bending rigidity by the KES method of the elastic sheet part is higher than the bending rigidity of the skin side sheet part,
    The said elastic sheet | seat part is arrange | positioned ranging over the edge of the waist circumference side of the said absorptive main body in the said longitudinal direction in the skin side of the said absorptive main body, The absorbent article characterized by the above-mentioned.
20. The absorbent article according to claim 19,
    In the longitudinal direction, the crotch side edge of the skin side part of the inner layer sheet part, the crotch side edge of the skin side sheet part, and the crotch side edge of the stretchable sheet part are shifted. An absorbent article characterized by having
21. The absorbent article according to claim 20, wherein
    In the longitudinal direction, an end of the crotch side of the skin side portion of the inner layer sheet portion is positioned on the crotch side most.
22. The absorbent article according to claim 16, wherein
    The absorbent article, wherein the inner layer sheet part is an elastic sheet part that can be expanded and contracted in the lateral direction.
23. The absorbent article according to any one of claims 19 to 22,
    In the longitudinal direction, the end of the crotch side of the stretchable sheet portion is located on the waistline side of the waistline side edge of the absorbent core.
24. The absorbent article according to any one of claims 16 to 23,
    The said skin side sheet | seat part is arrange | positioned in the skin side of the said absorptive main body ranging over the edge of the waist circumference side of the said absorptive main body in the said vertical direction, The absorbent article characterized by the above-mentioned.
25. The absorbent article according to any one of claims 16 to 24,
    The absorbent article, wherein the skin side sheet portion has a flexural rigidity of 0.0035 N · m ² / m × 10 ⁻⁴ or more by the KES method.
26. The absorbent article according to any one of claims 16 to 25, wherein
    An absorbent article having a compression recovery rate RC of 15% or more and 50% or less by the KES method of the skin side sheet part.
27. The absorbent article according to any one of claims 16 to 26, wherein
    The basis weight of the skin-side sheet portion is 10 g / m ² or more and 30 g / m ² or less, and the apparent density at a load of 49.03 hPa is 0.12 g / cm ³ or more and 0.2 g / cm ³ or less. Absorbent article.
28. The absorbent article according to any one of claims 16 to 27,
    The said skin side sheet | seat part contains the fiber whose fiber diameter is 14 micrometers or more and 22 micrometers or less, and the coefficient of variation MMD / MIUx100 of the friction coefficient by KES method is 2% or more and 6% or less, The absorbent article characterized by the above-mentioned.
29. The absorbent article according to any one of claims 16 to 28, wherein:
    An absorbent article, wherein the skin-side sheet portion has a friction coefficient MIU of at least 0.25.
30. An absorbent article according to any one of claims 16 to 29, wherein
    The said skin side sheet | seat part contains polyethylene fiber, The absorbent article characterized by the above-mentioned.

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