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WO2018180600A1 - Article absorbant - Google Patents

Article absorbant Download PDF

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Publication number
WO2018180600A1
WO2018180600A1 PCT/JP2018/010483 JP2018010483W WO2018180600A1 WO 2018180600 A1 WO2018180600 A1 WO 2018180600A1 JP 2018010483 W JP2018010483 W JP 2018010483W WO 2018180600 A1 WO2018180600 A1 WO 2018180600A1
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WO
WIPO (PCT)
Prior art keywords
sheet
layer sheet
polymer
disposed
nonwoven fabric
Prior art date
Application number
PCT/JP2018/010483
Other languages
English (en)
Japanese (ja)
Inventor
恵 葭葉
Original Assignee
大王製紙株式会社
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Filing date
Publication date
Application filed by 大王製紙株式会社 filed Critical 大王製紙株式会社
Publication of WO2018180600A1 publication Critical patent/WO2018180600A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • A61F13/536—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes having discontinuous areas of compression
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer

Definitions

  • the present invention relates to an absorbent article mainly used for incontinence pads, sanitary napkins, cage sheets, medical pads, toiletries, disposable diapers and the like.
  • the absorbent article there is no pulp fiber between a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet.
  • a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric
  • a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet.
  • Palpress absorbent polymer sheet is known.
  • the absorbent article using the polymer sheet has the advantage that the absorber can be thinned and the uncomfortable feeling when worn can be reduced.
  • the polymer sheet (1) generally has a low water absorption speed of a superabsorbent polymer compared to a water absorbent fiber such as pulp, so it cannot quickly absorb bodily fluids discharged at once, (2) swells after water absorption As a result, the distance between the superabsorbent polymers is narrowed and it is difficult for liquid to pass through, and gel blocking is likely to occur. (3) When a large amount of body fluid is discharged at once, the polymer sheet cannot absorb instantly and the amount of return to the surface increases. It has been pointed out to have drawbacks such as.
  • Patent Document 1 an absorbent laminate that does not contain pulp fibers other than a nonwoven fabric, and the two nonwoven fabrics are bonded by a network layer made of a hot-melt adhesive provided between the nonwoven fabrics.
  • an absorbent laminate is disclosed in which a water-absorbent resin powder adheres to the hot melt adhesive.
  • a water absorbent sheet is interposed between the top sheet and the back sheet, and the water absorbent sheet is fixed to the first sheet, the second sheet, and both sheets with an adhesive. It is disclosed that a hydrophilic nonwoven fabric or paper is used as the first sheet and the second sheet.
  • a support sheet serving as a support for an SAP (superabsorbent polymer) layer, an SAP receiving layer made of a fibrous material formed on the surface of the support sheet,
  • the SAP layer formed on the surface of the SAP receiving layer which does not contain a fibrous material and is composed of an SAP particle composition containing at least the SAP particles, and was placed so as to cover the surface of the SAP layer
  • a SAP sheet is disclosed in which a laminate is formed by laminating a covering sheet made of a hydrophilic material, the covering sheet is made of paper, and a fragile portion (penetrating portion) is formed in a wet state. .
  • the covering sheet is made of paper, and a weak portion (penetrating portion) in a wet state is formed. Part) is spread and the covering sheet is broken, so that the swelled SAP particles may spill out of the SAP sheet, and there is a concern about leakage of body fluid.
  • the main problem of the present invention is to provide an absorbent article having high liquid diffusibility, making it difficult to cause gel blocking, and having excellent absorption performance.
  • a polymer in which a superabsorbent polymer is disposed in a predetermined region between an upper layer sheet disposed on the skin side and a lower layer sheet disposed on the non-skin side The upper layer sheet is made of a nonwoven fabric containing chemical fibers, the lower layer sheet is made of a nonwoven fabric containing hydrophilic cellulosic fibers, and the superabsorbent polymer is disposed on the polymer sheet.
  • An absorbent article is provided in which an defined area is provided, and a joining portion for joining the upper layer sheet and the lower layer sheet is provided around the defined area.
  • FIG. 7 is an enlarged cross-sectional view of the polymer sheet 4 (view taken along line VII-VII in FIG. 4).
  • FIG. 7 is an enlarged cross-sectional view of a polymer sheet 4 according to a modified example (viewed along line VII-VII in FIG. 4).
  • 3 is an enlarged plan view of an intermediate sheet 19.
  • FIG. It is an expanded sectional view of polymer sheet 4A concerning a modification.
  • a sanitary napkin will be described as an example of an absorbent article.
  • the sanitary napkin 1 includes, as shown in FIGS. 1 and 2, a liquid-impervious back sheet 2 made of a polyethylene sheet or the like, a liquid-permeable top sheet 3 that quickly allows urine to permeate, A polymer sheet interposed between the two sheets 2 and 3 and having a superabsorbent polymer 12 disposed in a predetermined region between the upper layer sheet 10 disposed on the skin side and the lower layer sheet 11 disposed on the non-skin side.
  • the liquid-impervious back sheet 2 and the liquid-permeable front sheet 3 are bonded at the edge in the longitudinal direction by an adhesive such as hot melt or an adhesive means such as heat seal.
  • liquid-impervious back sheet 2 and the side nonwoven fabric 7 that are extended laterally from the polymer sheet 4 at both side edges thereof are bonded by an adhesive such as hot melt or an adhesive means such as heat seal.
  • an adhesive such as hot melt or an adhesive means such as heat seal.
  • a hydrophilic second sheet (not shown) may be disposed between the liquid-permeable top sheet 3 and the polymer sheet 4.
  • the liquid-impervious back sheet 2 a sheet material having at least water shielding properties, such as polyethylene and polypropylene, is used.
  • a sheet in this case, a liquid-impervious back sheet is composed of a waterproof film and a nonwoven fabric
  • the water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction.
  • a sheet is preferably used.
  • a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used as the liquid-permeable surface sheet 3.
  • the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton.
  • a nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft.
  • Side nonwoven fabrics 7 and 7 are provided on both sides of the surface of the sanitary napkin 1 along the longitudinal direction and over the entire length of the sanitary napkin 1, and the outer portions of the side nonwoven fabrics 7 and 7 are lateral.
  • the liquid-impervious back sheet 2 extends laterally, and the side nonwoven fabric 7 portion and the liquid-impervious back sheet 2 portion that extend laterally are joined together with a hot melt adhesive.
  • the side flaps are formed by joining together.
  • a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of important functions. For example, if importance is placed on functions such as preventing the penetration of urine, etc. or enhancing the feeling of touch, a water-repellent nonwoven fabric coated with a silicon-based, paraffin-based, or alkylchromic chloride-based water repellent is used. Is desirable.
  • the side nonwoven fabric 7 has a structure in which nonwoven fabrics manufactured by different manufacturing methods are laminated, for example, SSMS (spunbond / spunbond / meltblown / spunbond) nonwoven fabric, SMS (spunbond / meltblown / spun).
  • Bond nonwoven fabric
  • SMMS spunbond / meltblown / meltblown / spunbond
  • a hydrophilic treated non-woven fabric that is made hydrophilic by applying capillary action to make the synthetic fiber swell or porous by a method such as partially dissolving the surface to make it porous and depositing a metal hydroxide.
  • this side nonwoven fabric 7 what was formed by a proper processing method using natural fiber, synthetic fiber, regenerated fiber, etc. as a raw material can be used.
  • the side nonwoven fabrics 7 and 7 are appropriately folded to constitute a pair of left and right three-dimensional gathers BS that stand on the skin side with the position in the vicinity of the side edge of the absorbent body 4 as an upright base end.
  • the polymer sheet 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 includes an upper layer sheet 10 disposed on the skin side (liquid-permeable surface sheet 3 side), and a non-skin side.
  • a superabsorbent polymer 12 is arranged in a predetermined area between the lower sheet 11 and the liquid-impermeable back sheet 2 side.
  • the superabsorbent polymer 12 is not disposed in a state of being dispersed in a fibrous material such as pulp between the upper layer sheet 10 and the lower layer sheet 11, but alone as an aggregate of the aqueous polymer 12 (single unit Is arranged). Thereby, the thickness of the polymer sheet 4 is reduced, and the sanitary napkin 1 can be made thinner.
  • a porous or non-porous nonwoven fabric is used as the upper layer sheet 10 constituting the skin side layer of the polymer sheet 4.
  • fiber material of the nonwoven fabric chemical fiber is contained.
  • these synthetic fibers include rayon and cupra. Natural fibers such as recycled fibers and cotton can be included.
  • the processing method of the said nonwoven fabric is not ask
  • the upper layer sheet 10 is made of a non-woven fabric containing chemical fibers, the upper layer sheet 10 is difficult to retain the liquid, the liquid permeability to the lower layer side is improved, and body fluid is retained in the upper layer sheet 10 to the skin side. The phenomenon of reversing is less likely to occur.
  • the lower layer sheet 11 is composed of a nonwoven fabric containing hydrophilic cellulosic fibers.
  • the nonwoven fabric constituting the lower layer sheet 11 can contain 80% by weight or more of hydrophilic cellulosic fibers with respect to the whole nonwoven fabric, preferably 90% by weight or more, and 95% by weight or more. More preferably, it is more preferably 98% by weight or more.
  • the lower layer sheet 11 is more preferably composed of a nonwoven fabric made of hydrophilic cellulosic fibers. The higher the content ratio of the hydrophilic cellulose fiber, the faster the liquid absorption speed in the lower layer sheet 11, and the liquid diffusibility can be improved.
  • hydrophilic cellulosic fibers include naturally derived fibers such as cotton fibers and pulp fibers, and artificial cellulosic fibers such as rayon fibers, acetate fibers, and lyocell fibers.
  • cotton fibers include raw cotton, refined / bleached cotton fibers, or refined / bleached cotton fibers that have been dyed, refined / bleached cotton wool fibers, and yarns or fabrics that have been defibrated. Any cotton fibers such as hair can be used, but in order to increase the absorption speed and diffusibility of the liquid in the lower layer sheet 11, it is particularly preferable to use absorbent cotton obtained by degreasing the natural oil of cotton wax adhering to the surface of the cotton fibers. preferable.
  • a non-woven fabric made of 100% by weight of cotton fibers is used rather than paper made of pulp fibers, as is apparent from the Krem water absorption test results described in detail later. Is preferred. From the Klem water absorption test described later, the non-woven fabric composed of 100% by weight of cotton fibers can improve the diffusibility about 3 to 4 times that of paper (crepe paper).
  • the lower layer sheet 11 is preferably a non-woven fabric made of 100% by weight of cotton fibers. Containing 100% by weight of cotton fiber means that cotton fiber is used alone and does not contain chemical fiber. Thereby, the absorption speed of the liquid in the lower layer sheet 11 is increased, and the liquid diffusibility is excellent.
  • seat 11 is not ask
  • a processing method that increases the fiber density of the obtained product such as a spun bond method, a melt blown method, and a needle punch method.
  • the spunlace nonwoven fabric has advantages such as not using an adhesive and having flexibility.
  • the basis weight of the lower layer sheet 11 is 25 to 40 g / m 2 , preferably 29 to 34 g / m 2 , more preferably 29 to 32 g / m 2 , and the thickness is 0.25 to 0.50 mm, preferably 0.3. ⁇ 0.4 It is preferable to use mm.
  • the basis weight is calculated by measuring the weight of 5 cm ⁇ 30 cm ⁇ 10 sheets with an electronic balance and converting to square meters. The thickness is determined according to JIS-L1906.
  • the lower layer sheet 11 is an opening that penetrates the front and back, that is, formed by carrying a fiber material on a mesh-like support in a hydroentanglement process at the time of manufacturing a nonwoven fabric, and punching (punching) processing on a manufactured nonwoven fabric It is preferable that the openings formed by applying some kind of opening treatment to the lower layer sheet 11 are not provided. Thereby, the water absorption capability and liquid diffusibility in the lower layer sheet 11 can be improved.
  • the lower layer sheet 11 extends on the skin side surface or non-skin side surface along the longitudinal direction of the sanitary napkin 1 and is formed with a plurality of intervals in the width direction.
  • a number of depressions extending along the longitudinal direction of the sanitary napkin 1 disposed between the collars 13, 13, and the adjacent collars 13, 13 and recessed toward the non-skin side or the skin side from the collar 13.
  • You may comprise the groove structure in which the groove parts 14, 14, ... were formed.
  • the flange portion 13 is formed with a higher fiber density and higher density than the groove portion 14. This facilitates diffusion of body fluids in the longitudinal direction of the sanitary napkin 1 along the relatively high density ridges 13 due to the capillary action of the fibers.
  • the superabsorbent polymer 12 examples include a cross-linked polyacrylate, a self-crosslinked polyacrylate, a saponified acrylate-vinyl acetate copolymer cross-linked product, and a cross-linked isobutylene / maleic anhydride copolymer.
  • a crosslinked polysulfonate, and a partially crosslinked water-swellable polymer such as polyethylene oxide and polyacrylamide.
  • those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred.
  • the water-absorbing force and the water-absorbing speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient.
  • the polymer sheet 4 is provided with a defined region 15 in which a superabsorbent polymer 12 is disposed, and an upper layer sheet 10 and a lower layer are formed around the defined region 15.
  • a joining portion 16 for joining the sheet 11 is provided. That is, the superabsorbent polymer 12 interposed between the upper layer sheet 10 and the lower layer sheet 11 is disposed only in a predetermined defined area 15 defined by the joining portion 16 that joins the upper layer sheet 10 and the lower layer sheet 11. However, it is not disposed in any other region including the joint 16.
  • the superabsorbent polymer 12 is interposed between the upper sheet 10 and the lower sheet 11 with a predetermined basis weight or more. In other areas, the superabsorbent polymer 12 does not exist at all between the upper layer sheet 10 and the lower layer sheet 11 or is slightly spilled when the superabsorbent polymer 12 is sprayed on the defined area 15. Although there is an amount of superabsorbent polymer 12, the amount is extremely small compared to the amount of polymer disposed in the defined region 15.
  • the basis weight of the polymer sheet 4 is 10 to 300 g / m 2 , preferably 30 to 100 g / m 2 .
  • the absorption of the body fluid of the sanitary napkin 1 having the above configuration will be described in order.
  • the body fluid that has passed through the liquid-permeable surface sheet 3 and has reached the polymer sheet 4 has a low water absorption speed in the initial contact with the upper layer sheet 10 that contains chemical fibers and has a low water retention capability, and the body fluid. It passes through the layer of water-absorbing polymer and reaches the lower sheet 11. Since this lower layer sheet 11 is composed of a nonwoven fabric containing hydrophilic cellulosic fibers as described above, the lower layer sheet 11 has the effect that the absorption speed specific to the nonwoven fabric of cellulosic fibers is fast and the liquid diffusibility is excellent. The lower layer sheet 11 is quickly diffused over a wide area.
  • the body fluid diffused over a wide area of the lower layer sheet 11 is gradually absorbed and retained by the superabsorbent polymer 12 disposed adjacent to the upper layer side in the diffused region.
  • the lower layer sheet 11 made of a nonwoven fabric containing hydrophilic cellulosic fibers adopts a water-absorbing form in which it is diffused over a wide range and then transferred to the superabsorbent polymer 12, gel blocking by the superabsorbent polymer 12 is performed.
  • the polymer sheet 4 as a whole has excellent absorption performance such as high absorption speed and low reversal.
  • positioned contains the upper layer sheet
  • the joint 16 formed has a weaker joint strength than that obtained by heat-sealing chemical fibers.
  • the adhesive strength of the adhesive is weakened when the adhesive is wetted by the body fluid absorbed by the lower hydrophilic sheet 11 having high hydrophilicity. It is weak.
  • the joining portion 16 is peeled off, the defined region 15 where the superabsorbent polymer 12 is disposed is enlarged, and the swollen superabsorbent polymer 12 can flow to prevent gel blocking and absorb body fluid. It becomes excellent in nature.
  • the defined region 15 is an intermediate region between the upper layer sheet 10 and the lower layer sheet 11 that does not reach the outer edges of the upper layer sheet 10 and the lower layer sheet 11 in a plan view of the polymer sheet 4. Is formed. Thereby, the spillage of the superabsorbent polymer 12 can be prevented.
  • the defined area 15 may be arranged in the form of a plurality of cells partitioned by the joints 16 with respect to the upper layer sheet 10 and the lower layer sheet 11, or provided along the outer edge of the upper layer sheet 10 and the lower layer sheet 11. You may arrange
  • the superabsorbent polymer 12 is preferably fixed to the sheet with a hot melt adhesive or the like.
  • an outer edge joint portion (not shown) that is continuous in the circumferential direction with higher joint strength than the joint portion 16 is provided outside the joint portion 16, or the defining region 15.
  • the bonding strength can be increased by increasing the width of the bonding portion or using an adhesive having a high bonding strength.
  • the defined area 15 is preferably provided in a lattice shape along the longitudinal direction and the width direction of the sanitary napkin 1 as shown in FIG. That is, the defined area 15 is arranged in a regular lattice shape aligned along the longitudinal direction and the width direction of the sanitary napkin 1 or is staggered shifted every other half pitch along the longitudinal direction or the width direction. It is preferable to arrange in a grid pattern.
  • the defined area 15 can be formed in various plane patterns depending on the arrangement of the joints 16 that define the periphery.
  • the polymer sheet 4 is surrounded by a joint 16 that joins the upper layer sheet 10 and the lower layer sheet 11 at least in the top, bottom, left, and right positions in plan view, and the sanitary napkin 1. It is preferable that the structure is divided into a plurality of defined regions 15, 15... Arranged in a regular lattice shape along the longitudinal direction and the width direction, and having the superabsorbent polymer 12 disposed therein.
  • the arrangement pattern of the definition regions 15 is a substantially elliptical shape in which the planar shape is long in the longitudinal direction of the sanitary napkin 1, and the definition regions 15, 15.
  • a substantially rhombic definition region 17 in which the superabsorbent polymer 12 is not disposed is defined in the center of the four adjacent definition regions 15, 15.
  • the polymer sheet 4 has an upper layer sheet 10 and a lower layer sheet 11 joined together by a first joining portion 16a provided in a staggered arrangement.
  • a first joining portion 16a provided in a staggered arrangement.
  • a second joint portion 16b provided at an oblique middle position connecting the four first joint portions 16a, 16a,.
  • the staggered arrangement is an arrangement in which adjacent rows or columns having the same pitch are shifted by half a pitch every other row or every other column, and up and down and left and right every other row or every other column. Are arranged so that they are aligned with each other.
  • the vertical position is a position in the direction matching the longitudinal direction (front-rear direction) of the sanitary napkin 1
  • the left-right position is a position in the direction matching the width direction of the sanitary napkin 1. .
  • the polymer sheet 4 is surrounded by the first joint portion 16a and the second joint portion 16b, and is arranged in a regular lattice shape along the napkin longitudinal direction and width direction. Are located in the center of the four first defining regions 15, 15... Adjacent to each other (adjacent in the vertical and horizontal directions) and in four oblique directions (upper right, Upper left, lower right, and lower left) are divided into a second defined region 17 surrounded by the second joint portion 16b and in which the superabsorbent polymer 12 is not disposed.
  • the first defining region 15 includes first joints 16a, 16a,... Disposed at the top, bottom, left, and right positions, and second joints disposed at four positions in the middle of the top, bottom, left, and right positions. 16b, 16b...
  • the second definition region 17 includes four first definition regions 15, 15... (Upper and lower) in which the first definition regions 15, 15. Located in the center surrounded by two first definition areas 15 and 15 arranged in the direction and four first definition areas 15 and 15 arranged in the left-right direction). Each is surrounded by the second joint 16b.
  • first defined area 15 When a certain first defined area 15 is taken as a reference, the first defined area 15 is adjacent to both sides in the longitudinal direction of the napkin, and the first defined area 15 is disposed on both sides in the width direction of the napkin.
  • the formation region 15 is adjacent.
  • second defined areas 17 are adjacent to each other in the four oblique directions of the central first defined area 15 in the middle of the first defined areas 15, 15. Yes.
  • the upper layer sheet 10 in the region surrounded by the first joint portion 16 a and the second joint portion 16 b has a substantially central portion as a vertex.
  • a space portion is formed between the upper layer sheet 10 and the lower layer sheet 11 by bulging to the skin side in a dome shape.
  • the upper layer sheet 10 in the region surrounded by the four directions obliquely by the second joint portion 16b is approximately centered at the apex.
  • a space may be formed between the upper layer sheet 10 and the lower layer sheet 11 by bulging to the skin side in the shape of a quadrangular pyramid, and as shown in FIG. It is possible to prevent the space portion from being formed between the upper layer sheet 10 and the lower layer sheet 11 by stacking adjacent to each other without forming the space portion on the upper surface of the sheet 11.
  • the first defined area 15 is a polymer arrangement area in which the superabsorbent polymer 12 is arranged.
  • the second defined region 17 is a polymer non-arranged region in which the superabsorbent polymer 12 is not disposed, but may be a polymer disposed region in which the superabsorbent polymer 12 is disposed.
  • the bonding strength of the second bonding portion 16b is set to be smaller than the bonding strength of the first bonding portion 16a, and the pressure when the superabsorbent polymer 12 absorbs liquid and swells is greater than the first bonding portion 16a. It is preferable that the second joint portion 16b be preferentially peeled off. That is, it is preferable to have a relationship of bonding strength of the first bonding portion 16a> bonding strength of the second bonding portion 16b.
  • the joint of the first joint portion 16a is also peeled off.
  • the area of the second joint portion 16b can be made smaller than the area of the first joint portion 16a.
  • the joining portion 16 that joins the upper layer sheet 10 and the lower layer sheet 11 can employ a known method without limitation, and in particular, a heat seal that is heat-sealed simultaneously with pressing from the outer surface side of the upper layer sheet 10 or It is preferable to use an adhesive such as hot melt.
  • a heat seal that is heat-sealed simultaneously with pressing from the outer surface side of the upper layer sheet 10 or It is preferable to use an adhesive such as hot melt.
  • the cotton fibers constituting the lower layer sheet 11 do not melt, but the chemical fibers contained in the upper layer sheet 10 have thermoplasticity, so that some of the molten chemical fibers are fibers of the lower layer sheet 11.
  • the upper layer sheet 10 and the lower layer sheet 11 can be joined by melting in between and curing.
  • the joint 16 When continuously arranged so as to surround the periphery of the defined region 15, when the superabsorbent polymer 12 absorbs water and swells, the joint 16 is difficult to peel off, and the swelled superabsorbent polymer 12 can flow. Without causing gel blocking.
  • the separation distance between the adjacent joints 16 and 16 is arbitrary, but it is preferable that the distance be sufficient to prevent movement of the superabsorbent polymer 12 disposed inside.
  • an intermediate sheet 19 is disposed between the upper layer sheet 10 disposed on the skin side and the lower layer sheet 11 disposed on the non-skin side, and at least the upper layer sheet.
  • 10 and the intermediate sheet 19 are provided with a polymer sheet 4A in which a superabsorbent polymer 12 is arranged in a predetermined region, and the upper sheet 10 is made of a nonwoven fabric containing chemical fibers, and the intermediate sheet 19 and the lower sheet 11 At least one of which is made of a nonwoven fabric containing hydrophilic cellulosic fibers, and the polymer sheet 4A is provided with a defined area 15 in which a superabsorbent polymer 12 is disposed, and around the defined area 15
  • the joining portion 16 that joins the upper layer sheet 10, the intermediate sheet 19 and the lower layer sheet 11 where the superabsorbent polymer 12 is not disposed is provided. It has been kicked.
  • the superabsorbent polymer 12 is disposed only between the upper sheet 10 and the intermediate sheet 19 and is not disposed between the intermediate sheet 19 and the lower sheet 11.
  • the intermediate sheet 19 is disposed between the upper layer sheet 10 and the lower layer sheet 11 and is formed in substantially the same shape as the upper layer sheet 10 and the lower layer sheet 11.
  • the intermediate sheet 19 can be appropriately selected according to the fiber material of the lower layer sheet 11. That is, when the lower layer sheet 11 is made of a nonwoven fabric containing hydrophilic cellulosic fibers, the intermediate sheet 19 may be a liquid-permeable material.
  • the lower sheet 11 is perforated or non-porous like the upper layer sheet 10.
  • a non-woven fabric with holes can be used, and a non-woven fabric containing hydrophilic cellulosic fibers can be used in the same manner as the lower layer sheet 11.
  • the intermediate sheet 19 is a nonwoven fabric containing hydrophilic cellulosic fibers.
  • the intermediate sheet 19 is made of a nonwoven fabric containing hydrophilic cellulosic fibers, as shown in FIG. 10, the intermediate sheet 19 has a large number of apertures 20 penetrating the front and back in order to improve liquid permeability. 20 ... are preferably provided.
  • the opening 20 can be formed by supporting a fiber material on a mesh-like support in a hydroentanglement process when manufacturing a spunlace. In this case, by changing the conditions of the mesh to be used, it is possible to adjust the individual hole size and the hole area ratio.
  • the aperture 20 may be formed by punching (punching) the manufactured nonwoven fabric.
  • the opening 20 may be provided in the entire intermediate sheet 19 but is formed in a region including at least the body fluid discharge site H.
  • the body fluid discharge site H Preferably, it includes a body fluid discharge site H, 15% or more of the absorbent body length in the product length direction, 50% or more of the absorber width in the product width direction, and more preferably includes the body fluid discharge site H, and the product length direction And 50% or more of the absorber length and 70% or more of the absorber width in the product width direction.
  • the formation area of the opening is less than 15% of the absorbent body length in the product length direction and less than 50% of the absorbent body width in the product width direction, a situation in which the body fluid discharge range cannot be covered occurs.
  • gel blocking due to the superabsorbent polymer 12 is likely to occur.
  • the opening 20 is preferably formed in a vertically long shape that is long in the longitudinal direction of the sanitary napkin 1, as shown in FIG. For this reason, since it becomes easier for the liquid to permeate than the circular opening, the body fluid easily passes through the intermediate sheet 19 through the opening 20, and water retention to the intermediate sheet 19 is reduced. Further, when the body fluid passes through the opening 20, the liquid passes through while being deformed in the longitudinal direction, so that the diffusion direction of the body fluid can be controlled in the longitudinal direction of the napkin, the lateral diffusion is suppressed, and the lateral leakage is difficult. In addition, when the intermediate sheet 19 is formed by spunlace, the shape of the opening is difficult to be uniform. However, the shape of the opening 20 is generally a rectangular shape, a long hole shape with a corner or an elliptical shape. Or a shape in between.
  • the dimension of the opening 20 is that the length L1 of the sanitary napkin 1 in the longitudinal direction is 1.0 to 4 .
  • the length L2 in the width direction of the sanitary napkin 1 is 0.5 to 1.5 mm, preferably 0.5 to 1.0 mm. Is good.
  • the size of the opening 20 is less than 0.5 mm, it is difficult for bodily fluids to pass through, and it is difficult to form a clear opening due to the fluff of the fibers.
  • the maximum size of the opening 20 exceeds 4.0 mm, the liquid from the opening 20 And the like, and the superabsorbent polymer 12 falls off.
  • the ratio of L1 to L2 (L1 / L2) is 1.2 to 5.0, preferably 2.0 to 3.0.
  • the area A of the opening 20 is 0.9 to 3.0 mm 2 , preferably 0.9 to 2.5 mm 2 . Further, the open area ratio is 15 to 45%, preferably 17 to 30%, more preferably 18 to 25%. The dimension of the opening 20 does not need to be uniform over the whole, and can be formed in any size within the above range.
  • the intermediate sheet 19 extends along the longitudinal direction of the sanitary napkin 1 and is formed with a plurality of vertical bars 21, 21.
  • a plurality of transverse stripes 22, 22... are formed which extend along the width direction of the sanitary napkin 1 and are spaced apart in the longitudinal direction.
  • a structure in which the opening 20 is formed in a portion surrounded by the stripes 21 and the transverse stripes 22 is formed.
  • the width W1 of the vertical bars 21 is 0.5 to 2.5 mm, preferably 0.8 to 1.3 mm, and the width W2 of the horizontal bars 22 is 0.2 to 1.6 mm, preferably It is preferable that the thickness is 0.3 to 0.7 mm.
  • the ratio between the widths W1 and W2 (W1 / W2) is 1.2 to 2.0, preferably 1.5 to 2.0.
  • the vertical stripes 21 are formed with a higher fiber density and higher density than the horizontal stripes 22. Accordingly, when the body fluid passes through the intermediate sheet 19, diffusion of the sanitary napkin 1 in the longitudinal direction along the relatively high-density longitudinal muscles 21 is likely to occur due to the capillary action of the fibers. Further, since the diffusion direction of the body fluid passing through the opening 20 and the urine permeating through the intermediate sheet 19 coincide with the longitudinal direction of the sanitary napkin 1, the intermediate sheet is drawn into the body fluid passing through the opening 20 Since the 19 vertical bars 21 penetrate, the remaining liquid of the intermediate sheet 19 is suppressed as much as possible.
  • the measurement of the fiber amount can be performed according to “Paper pulp screening test method” of JIS P8207.
  • the density can be measured according to JIS P8118 “Testing methods for thickness and density”.
  • the intermediate sheet 19 is composed of a nonwoven fabric containing hydrophilic cellulosic fibers.
  • the body fluid that has absorbed water into the intermediate sheet 19 and diffused in a wide range is absorbed by the highly water-absorbing polymer 12 disposed at least on the upper layer side of the intermediate sheet 19, so that gel blocking is less likely to occur.
  • the water-absorbing property to the highly water-absorbing polymer 12 becomes excellent.
  • the superabsorbent polymer 12 is arranged in each predetermined region between the upper layer sheet 10 and the intermediate sheet 19 and between the intermediate sheet 19 and the lower layer sheet 11.
  • the superabsorbent polymer 12 is arranged on both the upper layer side and the lower layer side of the intermediate sheet 19.
  • the intermediate sheet 19 it is desirable to use a nonwoven fabric containing hydrophilic cellulosic fibers as the intermediate sheet 19.
  • the body fluid that has absorbed water into the intermediate sheet 19 and diffused in a wide range is absorbed by the superabsorbent polymer 12 disposed on the upper layer side and the lower layer side of the intermediate sheet 19, so that gel blocking occurs more reliably. While becoming difficult, it becomes excellent in the water absorptivity to the superabsorbent polymer 12.
  • the opening 20 is provided in the intermediate sheet 19.
  • the liquid permeability to the layer of the superabsorbent polymer 12 disposed between the intermediate sheet 19 and the lower layer sheet 11 becomes good, and the upper layer sheet 10 and the lower layer 10 pass through the opening 20 in the joint 16. Since the sheet 11 can be directly bonded, the bonding strength of the bonding portion 16 can be increased to some extent.
  • the embodiment described above can be used as a sanitary napkin, an incontinence pad, a cage sheet, a medical pad, a toiletry, a disposable diaper, and the like.
  • a polymer sheet in which a superabsorbent polymer is disposed in a predetermined region between an upper layer sheet disposed on the skin side and a lower layer sheet disposed on the non-skin side is provided, and the upper layer sheet is chemically
  • the lower layer sheet is made of a nonwoven fabric containing hydrophilic cellulosic fibers, and the polymer sheet is provided with a defined region in which the superabsorbent polymer is disposed,
  • an absorbent article characterized in that a joining portion for joining the upper layer sheet and the lower layer sheet is provided around the defined region.
  • the said upper layer sheet consists of a nonwoven fabric containing a chemical fiber
  • the said lower layer sheet is hydrophilic cellulose
  • the polymer sheet which consists of a nonwoven fabric containing a system fiber is provided.
  • the form of absorption of body fluid in such an absorbent article is as follows. That is, the bodily fluid that has reached the polymer sheet passes through the upper layer sheet containing the chemical fiber and its water retention ability is kept low, and the superabsorbent polymer layer having a low water absorption speed in the initial contact with the bodily fluid. Reach the sheet.
  • the body fluid that reaches the lower layer sheet is quickly absorbed into the lower layer sheet due to the effect of high body fluid absorption speed and excellent diffusibility, which is characteristic of the nonwoven fabric containing hydrophilic cellulosic fibers. Quickly spread over a wide area. Then, in the diffused region, the water is gradually absorbed and retained by the superabsorbent polymer disposed adjacent thereto.
  • the lower layer sheet made of nonwoven fabric containing hydrophilic cellulosic fibers adopts an absorption form in which it is diffused over a wide range and then transferred to a superabsorbent polymer, resulting in gel blocking by the superabsorbent polymer.
  • the polymer sheet as a whole has excellent absorption performance such as high absorption speed and difficulty in reversing.
  • the superabsorbent polymer is disposed in an area defined by the joint portion. Since this joining portion is obtained by joining an upper layer sheet made of a non-woven fabric containing chemical fibers and a lower layer sheet made of a non-woven fabric containing cellulosic fibers, the joining strength is small and high water absorption as described in detail later.
  • the joint is easily peeled off by the pressure when the polymer absorbs water and swells. Separation of the joint expands the defined region where the superabsorbent polymer is arranged, and the superabsorbent polymer swollen to the enlarged region can flow, thereby preventing gel blocking and improving the absorbability of body fluids. Become better.
  • an intermediate sheet is disposed between an upper layer sheet disposed on the skin side and a lower layer sheet disposed on the non-skin side, and at least a predetermined amount between the upper layer sheet and the intermediate sheet
  • the polymer sheet is provided with a defined region in which the superabsorbent polymer is disposed, and a joint for joining the upper layer sheet, the intermediate sheet and the lower layer sheet is provided around the defined region.
  • An absorbent article is provided.
  • the aspect according to Supplementary Note 2 is a second form example of the polymer sheet in which an intermediate sheet is disposed between the upper layer sheet and the lower layer sheet.
  • the polymer sheet according to the present embodiment includes a polymer sheet in which a superabsorbent polymer is disposed at least in a predetermined region between the upper layer sheet and the intermediate sheet.
  • seat consists of a nonwoven fabric containing a chemical fiber
  • seat is comprised from the nonwoven fabric containing a hydrophilic cellulose fiber. Therefore, the absorption mode of the body fluid in this case is as follows.
  • the body fluid that has reached the polymer sheet passes through the upper layer sheet having a low water absorption capacity by containing chemical fibers, and the layer of the superabsorbent polymer that has a low water absorption speed at the initial contact with the body fluid, and is hydrophilic.
  • a non-woven fabric layer at least one of an intermediate sheet and a lower layer sheet
  • the body fluid that has reached the nonwoven fabric layer is transformed into a nonwoven fabric containing hydrophilic cellulosic fibers due to the effect of high body fluid absorption speed and excellent diffusivity, which is unique to nonwoven fabrics containing hydrophilic cellulosic fibers.
  • the superabsorbent polymer is also disposed in a predetermined region between the intermediate sheet and the lower layer sheet, and when the intermediate sheet is composed of a nonwoven fabric containing hydrophilic cellulosic fibers, Since the body fluid that has penetrated into the intermediate sheet and diffused in a wide range is absorbed by the highly water-absorbing polymer respectively disposed on the upper layer side and the lower layer side of the intermediate sheet, gel blocking is less likely to occur, and high water absorption The water-absorbing property to the water-soluble polymer is improved.
  • the superabsorbent polymer is disposed in an area defined by the joint portion. Since this joining portion is obtained by joining an upper layer sheet made of a non-woven fabric containing chemical fibers and a lower layer sheet made of a non-woven fabric containing cellulosic fibers, the joining strength is small and high water absorption as described in detail later.
  • the joint is easily peeled off by the pressure when the polymer absorbs water and swells. Separation of the joint expands the defined region where the superabsorbent polymer is arranged, and the superabsorbent polymer swollen to the enlarged region can flow, thereby preventing gel blocking and improving the absorbability of body fluids. Become better.
  • a spunlace nonwoven fabric composed of 100% by weight of cotton fibers is used as the nonwoven fabric containing hydrophilic cellulosic fibers. For this reason, in this nonwoven fabric layer, the water absorption speed is even faster and the diffusibility becomes excellent.
  • the absorbent article according to any one of supplementary notes 1 to 3 is provided in which the joint portion is formed of a heat seal or an adhesive.
  • the joint portion when the joint portion is configured by heat sealing or an adhesive, the joint portion is easily peeled by the pressure of the highly water-absorbing polymer that has absorbed water and swelled. Specifically, even when the joint is made of heat seal, the cellulosic fiber is not melted by heat, so that the joint strength is weak and the joint is easily peeled off.
  • the adhesive when the adhesive is a hot melt adhesive, the adhesive strength of the adhesive is weakened by wetting the adhesive with body fluid, and the joint is easily peeled off.
  • the joint is peeled off by the superabsorbent polymer that has absorbed water and swollen by providing the joint intermittently at predetermined intervals along the periphery of the defined region. It is easy.
  • the superabsorbent polymer disposed in the defined region can be hydrophilic.
  • the body fluid diffused by the non-woven fabric containing the hydrophilic cellulosic fiber is likely to absorb water.

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

La présente invention comprend une feuille polymère (4) dans laquelle un polymère superabsorbant (12) est disposé dans des zones prédéterminées entre un voile supérieur (10) qui est disposé du côté peau et un voile inférieur (11) qui est disposé du côté opposé à la peau. Le voile supérieur (10) comprend un tissu non tissé contenant des fibres chimiques, le voile inférieur (11) comprend un tissu non tissé contenant des fibres de cellulose hydrophiles, et la feuille polymère (4) comporte des régions définies (15) dans lesquelles le polymère superabsorbant (12) est disposé et des parties de liaison où le voile supérieur (10) et le voile inférieur (11) sont reliés autour des régions définies (15).
PCT/JP2018/010483 2017-03-29 2018-03-16 Article absorbant WO2018180600A1 (fr)

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JP2017-064173 2017-03-29
JP2017064173A JP6382384B1 (ja) 2017-03-29 2017-03-29 吸収性物品

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Cited By (1)

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CN115066222A (zh) * 2020-03-25 2022-09-16 大王制纸株式会社 吸收性物品

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JP6937733B2 (ja) * 2018-10-31 2021-09-22 ユニ・チャーム株式会社 吸収性物品
JP7153002B2 (ja) * 2019-09-27 2022-10-13 大王製紙株式会社 吸収性物品
JP6942771B2 (ja) * 2019-09-27 2021-09-29 大王製紙株式会社 吸収性物品
JP7159143B2 (ja) * 2019-09-27 2022-10-24 大王製紙株式会社 吸収性物品
JP7159144B2 (ja) * 2019-09-27 2022-10-24 大王製紙株式会社 吸収性物品
JP7291053B2 (ja) * 2019-09-27 2023-06-14 大王製紙株式会社 吸収性物品
JP7574072B2 (ja) 2020-12-22 2024-10-28 日本製紙クレシア株式会社 吸収性物品

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JPS59159418U (ja) * 1983-11-10 1984-10-25 ユニ・チャ−ム株式会社 衛生用品
JPS61103405U (fr) * 1984-12-07 1986-07-01
JP2012152472A (ja) * 2011-01-27 2012-08-16 Unicharm Corp パッド形態を有する吸水性物品
JP2014079323A (ja) * 2012-10-15 2014-05-08 Livedo Corporation 吸収性物品
JP2014079324A (ja) * 2012-10-15 2014-05-08 Livedo Corporation 吸収性物品
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JPS5521203A (en) * 1978-08-01 1980-02-15 Mitsui Zellerbach Kk Sheet for absorption
JPS59159418U (ja) * 1983-11-10 1984-10-25 ユニ・チャ−ム株式会社 衛生用品
JPS61103405U (fr) * 1984-12-07 1986-07-01
JP2012152472A (ja) * 2011-01-27 2012-08-16 Unicharm Corp パッド形態を有する吸水性物品
JP2014079323A (ja) * 2012-10-15 2014-05-08 Livedo Corporation 吸収性物品
JP2014079324A (ja) * 2012-10-15 2014-05-08 Livedo Corporation 吸収性物品
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CN115066222B (zh) * 2020-03-25 2023-10-24 大王制纸株式会社 吸收性物品

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