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WO2013038667A1 - Disposable wearing article - Google Patents

Disposable wearing article Download PDF

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Publication number
WO2013038667A1
WO2013038667A1 PCT/JP2012/005807 JP2012005807W WO2013038667A1 WO 2013038667 A1 WO2013038667 A1 WO 2013038667A1 JP 2012005807 W JP2012005807 W JP 2012005807W WO 2013038667 A1 WO2013038667 A1 WO 2013038667A1
Authority
WO
WIPO (PCT)
Prior art keywords
lateral direction
region
waist
dimension
elastics
Prior art date
Application number
PCT/JP2012/005807
Other languages
French (fr)
Inventor
Tomoko Tsuji
Takahito Nagai
Noriyuki Kurita
Original Assignee
Unicharm Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unicharm Corporation filed Critical Unicharm Corporation
Priority to CN201280044171.3A priority Critical patent/CN103826586B/en
Publication of WO2013038667A1 publication Critical patent/WO2013038667A1/en

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Classifications

    • 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
    • A61F13/45—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 shape
    • A61F13/49—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 shape specially adapted to be worn around the waist, e.g. diapers, nappies
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49014—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the side panels

Definitions

  • the present disclosure relates to disposable wearing articles.
  • JP 2009-183364 A discloses a disposable diaper provided with flaps defined by hook members attached in the rear waist region, and the hook members may be connected to an outer sheet of the front waist region so as to form an annular waist opening.
  • the flaps are elasticized by elastic members to be stretchable and contractible in a lateral direction. By elasticizing the flaps, it is possible to keep the diaper in close contact with the wearer's waist.
  • Some embodiments of the present invention provide a disposable wearing article having a longitudinal direction and a lateral direction.
  • the article includes a chassis and a fastening system.
  • the chassis includes a skin facing side, a non-skin facing side opposite to the skin facing side, front and rear waist regions, a first waist region which is one of the front and rear waist regions, a second waist region which is the other thereof, and a crotch region located between the first and second waist regions.
  • the fastening system is configured to connect the first and second waist regions and includes a first fastening component located on the non-skin facing side of the first waist region and a second fastening component connectable to the first fastening component.
  • the second fastening component is attached in one of a pair of side panels extending from the second waist region in the lateral direction.
  • the side panels are elastically stretchable and contractible in the lateral direction.
  • Each side panel is provided with an elastic region being stretchable and contractible at least in the lateral direction and a non-elastic region located in outer lateral portions of the elastic region in the lateral direction.
  • a stretch ratio of a dimension of the side panel in a maximum stretched state of the elastic region in the lateral direction is about 10 to about 40% in relation to a dimension of the side panel in a contracted state of the elastic region in the lateral direction.
  • a tensile stress of the side panel in the lateral direction is about 1 to about 5 N/50 mm.
  • maximum stretched state refers to a state in which when the side panel is pulled in the lateral direction against a contracting force of the elastic region, the elastic region is extended to its full length and may not be further extended. It is a “maximum stretch point”. It should be noted that it does not involve elongating the side panel until it is ruptured.
  • FIG.1 is a perspective view illustrating a worn state of a disposable diaper as an example of disposable wearing articles in some embodiments.
  • FIG.2 is a developed plan view seen from a skin facing side of the diaper.
  • FIG.3 is an exploded perspective view of the diaper.
  • FIG.4 is a cross section view taken along IV-IV line of FIG.2.
  • FIG.5(a) is a plan view of a side panel illustrating a contracted state of the side panel.
  • FIG.5(b) is a plan view illustrating a stretched state of the side panel.
  • FIG.6 is a graph illustrating a tensile strength characteristic of the side panel.
  • FIG.7 is a developed plan view similar to Fig. 2 and illustrating a disposable diaper of other embodiments.
  • a diaper 1 according to some embodiments of the present invention is adapted to be used for adults, and particularly for a person who requires excretion assistance such as a bed-ridden person, a person in a wheel chair, or the like.
  • the diaper 1 has a longitudinal direction Y and lateral direction X, and includes a front waist region 11, a rear waist region 12, a crotch region 13 located between the front and rear waist regions 11, 12, front and rear end edges 14, 15 extending in the lateral direction X, and lateral edges 16 extending in the longitudinal direction Y.
  • One of the front and rear waist regions is referred to herein as a first waist region, and the other of the front and rear waist regions is referred to herein as a second waist region.
  • the diaper 1 is formed with a waist opening by engaging hook fasteners 77 of a mechanical fastening system provided in the rear waist region 12 with the front waist region 11, and thereby the diaper 1 may be kept in close contact with the wearer's body.
  • the diaper 1 has an imaginary longitudinal center line P-P to bisect a dimension in the lateral direction X so as to be substantially symmetrical about the imaginary longitudinal center line P-P.
  • some reference signs of similar symmetrical components/portions are omitted.
  • respective elastics are shown in a state when the elastics are stretched against contracting forces thereof.
  • the diaper 1 includes a liquid permeable topsheet 20 lying on a skin facing side, backsheet 30 lying on a non-skin facing side (garment facing side), a body fluid absorbent structure 40 lying between the topsheet 20 and backsheet 30, and a hardly-liquid permeable or liquid impermeable leakage-barrier sheet 50 located between the absorbent structure 40 and backsheet 30.
  • a pair of containment sheets 60 is provided being spaced from each other in the lateral direction X and extending in the longitudinal direction Y.
  • the topsheet 20 and backsheet 30 define a chassis 10 of the diaper 1.
  • topsheet 20 for example, at least one of a hydrophilic spunbond nonwoven fabric and a point-bonded nonwoven fabric having a mass per unit area of about 15 to about 35 g/m 2 , preferably about 18 to about 23 g/m 2 may be used.
  • backsheet 30 for example, at least one of a spunbond/melt blown/spunbond (hereafter referred to as SMS) nonwoven fabric and a spunbond nonwoven fabric having a mass per unit area of about 10 to about 30 g/m 2 may be used.
  • SMS spunbond/melt blown/spunbond
  • the containment sheet 60 for example, an SMS nonwoven fabric having a mass per unit area of about 10 to about 30 g/ m 2 may be used.
  • Each containment sheet 60 are laid on the topsheet 20 so that the front and rear end edges 61, 62 of the containment sheet 60 may respectively align with front and rear end edges 21, 22 of the front sheet 20 and be joined to each other by known joining means such as a hot melt adhesive or the like (not illustrated).
  • a proximal edge portion 63 of the containment sheet 60 and the lateral edge portion 33 of the backsheet 30 overlap, and are joined to each other by known joining means such as a hot melt adhesive or the like (not illustrated).
  • a distal edge portion 64 of the containment sheet 60 is laid on the topsheet 20 in a state in which the diaper 1 is expanded in the longitudinal direction Y.
  • an elastic 65 extending in the longitudinal direction Y is contractibly attached in a stretched state. Due to the contraction of the elastic 65, the distal edge portion 64 may be spaced apart from the topsheet 20 toward the wearer's skin so as to come into close contact with the wearer's skin. As a result, bodily waste such as feces may be contained inside the containment sheet 60.
  • the absorbent structure 40 is disposed at least in the crotch region 13. In this embodiment, however, it is arranged to extend from the crotch region 13 into the front and rear waist regions 11, 12, thereby to absorb bodily exudates such as urine or the like in a relatively large range.
  • the absorbent structure 40 is formed by wrapping a liquid absorbent core with a liquid dispersing wrapping sheet such as tissue paper or the like.
  • a liquid dispersing wrapping sheet such as tissue paper or the like.
  • As the core fluff wood pulp, superabsorbent polymer particles or a mixture thereof may be used.
  • the core and the wrapping sheet may be joined to each other by known joining means such as a hot melt adhesive or the like (not illustrated).
  • the leakage-barrier sheet 50 disposed between the absorbent structure 40 and the backsheet 30 a hardly-liquid permeable, preferably liquid impermeable and breathable plastic film may be used.
  • the leakage-barrier sheet 50 is formed to have a larger area than that of the absorbent structure 40. With such an arrangement, it is possible to prevent the exudates such as urine or the like having been absorbed by the absorbent structure 40 from leaking outside the diaper 1.
  • the leakage-barrier sheet 50 may be interposed between the wrapping sheet of the absorbent structure 40 and the backsheet 30 and secured by known joining means such as a hot melt adhesive or the like (not illustrated).
  • Leg elastics 51 are attached to the leakage-barrier sheet 50 on a surface opposite to a surface facing the backsheet 30.
  • the leg elastics 51 are joined to at least one of the leakage-barrier sheet 50 and the containment sheet 60 by known joining means such as a hot melt adhesive or the like (not illustrated).
  • the leg elastics 51 extends in the longitudinal direction Y along the lateral edges 16 in the crotch region 13, and the first end edge 51a located on the side of the front waist region 11 extends to the front waist region 11, and the second end edge 51b located on the side of the rear waist region 12 extends to the rear waist region 12 and is contractibly attached in a stretched state in the longitudinal direction Y.
  • a plurality of thread, string, or strand elastics may be used as the leg elastics 51.
  • a pair of side panels 70 is attached in the lateral edges 16 in the rear waist region 12 of the chassis 10.
  • Each side panel 70 includes a first sheet 71 lying on the skin facing side, a second sheet 72 lying on the non-skin facing side, and a plurality of side panel elastics 73 disposed between these sheets.
  • Inner edges 71a, 72a of the first and second sheets 71, 72 are joined to the chassis 10 via the connecting sheet 74.
  • an inner edge 72a of the second sheet 72 is joined to one end portion of the connecting sheet 74, and at the other end portion of the connecting sheet 74, an opposite surface facing the second sheet 72 is joined to the backsheet 30.
  • Outer edges 71b, 72b of the first and second sheets 71, 72 are joined between a first tab sheet 75 and a second tab sheet 76.
  • the hook fastener 77 is secured on the skin facing side of the second tab sheet 76.
  • known joining means such as a hot melt adhesive or fusion bonding may be used (not illustrated).
  • the first and second sheets 71, 72 are substantially the same in shape and size and joined to each other by known joining means such as a hot melt adhesive or fusion bonding (not illustrated).
  • a hot melt adhesive or fusion bonding As material thereof, for example, an SMS nonwoven fabric having a mass per unit area of about 10 to about 30 g/ m 2 may be used.
  • These first and second sheets 71, 72 are made of non-stretchable nonwoven fabrics.
  • non-stretchable means that it is not elastically stretchable and contractible, and when it is used for the diaper 1, it does not change any dimension affecting a circumferential dimension of the waist opening when putting the diaper 1 on a wearer even if it is pulled by at least a normal force in the lateral direction X.
  • a plurality of side panel elastics 73 is attached to at least one of the first and second sheets 71, 72.
  • the respective side panel elastics 73 are contractibly attached at predetermined intervals in the longitudinal direction Y and in a stretched state in the lateral direction X.
  • an elastic region 78 being elastically stretchable and contractible in the lateral direction X is defined.
  • the elastic region 78 is a region in which the side panel elastics 73 are stretchable and contractible.
  • the side panel elastics 73 for example, thread, string or strand elastics of about 470 to about 940 dtex may be used, and these elastics are attached to the first and second sheets 71, 72 at a pitch of about 5 to about 15 mm in the longitudinal direction Y, while being stretched to about 2 to about 3 times their original length in the lateral direction X.
  • the side panel elastics 73 of about 620 dtex are attached to the first and second sheets 71, 72 at a pitch of about 10 mm in the longitudinal direction Y, while being stretched to about 2.6 times their original length in the lateral direction X.
  • a spunbond nonwoven fabric having a mass per unit area of about 30 to about 50 g/m 2 may be used.
  • a spunbond nonwoven fabric having a mass per unit area of about 30 to about 50 g/m 2 may be used.
  • inner and outer non-elastic regions 79a, 79b which are not elastically stretchable and contractible are formed on opposite sides of the elastic region 78 in the lateral direction X.
  • two hook fasteners 77 being spaced from each other in the longitudinal direction Y are attached.
  • the hook fastener 77 is also referred to as a second fastening component
  • the backsheet 30 of the front waist region 11 is also referred to as a first fastening component.
  • the first fastening component may be defined over an entire region in the lateral direction X from one side edge 16 to the other side edge 16 thereby to engage the hook fastener 77 to any portions of the non-skin facing side of the chassis 10. Since the hook fastener 77 may be connected in a wide range of the front waist region 11, the connection between the front and rear waist regions 11, 12 may be appropriately adjusted based on the body shape or physical condition of the wearer so as to keep it in close contact with the wearer. Moreover, since other members are not required for use of the backsheet 30 as the first fastening component, the production cost may be reduced accordingly.
  • the first fastening component may be attached on the elective area of the front waist region 11 or in the substantially entirety of the front waist region 11.
  • a dimension A1 of the front waist region 11 in the lateral direction X and a dimension A2 of the rear waist region 12 in the lateral direction X are substantially equal.
  • a dimension in the lateral direction X is smaller than dimensions A1 and A2.
  • the dimensions A1 and A2 are about 350 to about 650 mm. In a specific configuration of this embodiment, it is about 435 mm (refer to FIG.2).
  • the dimension B1 of the side panel 70 in the lateral direction X is about 80 to about 200 mm in a contracted state of the elastic region 78. In a specific configuration of this embodiment, it is about 120 mm.
  • the dimension of the side panel 70 in the lateral direction X is a dimension from the outer end edge 76a of the second tab sheet 76 to the side edge 16 of the chassis 10, and the term "contracted state" of the elastic region78 refers to a state in which the side panel elastics 73 are relaxed (i.e., without being subject to external forces) and elastically contract, creating gathers in the first and second sheets 71, 72, and in which a dimension of the side panel 70 in the lateral direction X is measured without pulling the side panel elastics 73 in the lateral direction X.
  • the dimension B2 of the side panel 70 in the lateral direction X when the elastic region 78 is in a maximum stretched state is about 100 to about 300 mm. In a specific configuration of this embodiment, it is about 165mm.
  • the "maximum stretched state" of the elastic region 78 refers to a state in which when the side panel 70 is pulled in the lateral direction X against a contracting force of the elastic region 78, the elastic region 78 is elongated to its full length and no further elongation is possible without rupture. In other words, it is a maximum stretch point.
  • the term "maximum stretched state” does not involve a state in which the side panel 70 is stretched until the first and/or second sheets 71, 72 in the side panels 70 is/are ruptured.
  • the dimension B2 of the side panels 70 in the maximum stretched state of the elastic region 78 has a stretch ratio of about 10 to about 40%, preferably about 15 to about 35%.
  • the stretch ratio is calculated by using an equation as follows: (dimension B2 - dimension B1) / dimension B2 x 100. In a specific configuration of this embodiment, the stretch ratio is about 27%.
  • the dimension A1 is substantially equal to A2 in a specific configuration of this embodiment, it is preferable that the dimension A1 be equal to or greater than about 50% of (dimension A2 + dimension B2).
  • the dimension A1 of the front waist region 11 in the lateral direction X is too smaller than that of the rear waist region 12, the region to be engaged with the hook fastener 77 might be too small and accordingly it might be difficult to engage the hook fastener 77 with the front waist region 11.
  • a size range of the waist opening defined by the front and rear waist regions 11, 12 might be narrower, and it might be difficult to put the diaper on a wearer particularly having a large waist size.
  • a large area to be engaged with the hook fastener 77 may be ensured so that the diaper may be put on wearers having a variety of waist sizes.
  • the dimension B2 is about 15 to about 25% of the dimension of the diaper 1 in the lateral direction X.
  • the tensile stress of the side panel 70 in the lateral direction X as described above is about 1 to about 5 N/50 mm, preferably about 1 to about 4 N/50 mm.
  • the tensile stress of the side panels 70 was obtained based on a result of a tension test measured with INSTRON (model: 5564) of Instron Japan Company Ltd. Referring to FIG.5(a), as a sample S, the side panel in a contracted state was cut out into a piece in which a dimension in the lateral direction X was 150 mm and a dimension in the longitudinal direction Y was 50 mm for use.
  • the sample S that was cut out had the elastic region 78 and inner and outer non-elastic regions 79a, 79b.
  • the sample S was held at the end portions thereof between a pair of chucks of a measuring device.
  • the parts held by the chucks were outboard of the elastic region 78, more specifically, the inner and outer non-elastic regions 79a, 79b.
  • the chuck was pulled at a rate of 300 mm/min in opposite directions to each other.
  • the measurement result is illustrated in a graph in FIG.6.
  • the longitudinal axis indicates the load and the lateral axis indicates the tensile elongation.
  • the tensile stress (N/50 mm) was obtained from a load (N) with 90% elongation in the graph in FIG.6 in which a tensile elongation (dimension B2) of the maximum stretch point is set to 100%.
  • the load of the tensile elongation of 40.5 mm in the graph in FIG.6 was about 2.5N, and the tensile stress was about 2.5 N/50 mm.
  • the diaper 1 may be put on a bed-ridden adult, for example.
  • the dimension of the diaper 1 in the maximum stretched state of the elastic regions 78 in the lateral direction X i.e., a dimension from one of the outer end edges 76a of the second tab sheet 76 to the other of the outer end edges 76a is represented by the dimension A2 + 2 x dimension B2, and it is about 550 to about 1250 mm in a specific configuration of this embodiment.
  • the diaper 1 may be preferably used as a diaper for adults applicable to the wearers having a variety of body sizes. In order for putting the diaper 1 on the wearer, for example, the wearer is to lie down sideways on a bed.
  • the diaper 1 is spread out flatwise on the bed (referring to FIG.2) such that when the wearer lies on the wearer's back, the diaper 1 underlies the buttocks of the wearer. Then, the wearer is turned over to the opposite side so as to lie sideways, and after the diaper 1 is aligned, the wearer is turned over to lie on the wearer's back again.
  • each side panel 70 is pulled outwardly in the lateral direction X. Since the stretch ratio of the side panels 70 is about 10 to about 40%, each side panel 70 may be stretched to its full length at a relatively early stage after the side panel 70 started to be pulled and stop elongating any longer. This is because the elongation of the side panel elastics 73 is regulated by the first and second sheets 71, 72 being non-stretchable. This is a maximum stretch point.
  • the side panels 70 may be stretched up to the maximum stretch point, and then the hook fasteners 77 may be attached to the backsheet 30.
  • the maximum stretch point does not occur, it is difficult for the user to decide how much to pull the side panels 70. If it is pulled too much, the diaper 1 becomes too tight, or if it was not pulled adequately, the diaper 1 might be too loose. Particularly, in diapers for adults having a large dimension of the chassis 10 in the lateral direction X, the dimension of the side panels in the lateral direction X is generally large, and the side panels easily elongate in the lateral direction X considerably. Therefore, if there is no sense of the maximum stretch point at an early stage, the side panels continue to be pulled in the lateral direction, which makes it more difficult to decide how much to pull and hard to use.
  • the side panels 70 are stretched up to the maximum stretch point and then the hook fasteners 77 are engaged at appropriate positions on the other (e.g., front) waist region, it is possible that the size of the waist opening defined by the front and rear waist regions 11, 12 may be in a predetermined range, thereby the diaper 1 will be unlikely too tight or too loose every time the diaper is changed.
  • the stretch ratio of the side panels 70 is smaller than 10%, tight contact of the diaper 1 with the wearer might decrease, and when it is greater than 40%, a sense of the maximum stretch point might not be obtained.
  • the diaper 1 as described above is provided with the elasticized side panels 70, it may be used for wearers having a variety of waist sizes. Compared to diapers for babies, diapers for adults cover a wide range of waist sizes of the wearer. Waist sizes of adults considerably vary based on gender, and there is also a great difference in physique based on individuals.
  • the diaper 1 may be applicable to a wide range of waist sizes of the wearers.
  • the side panels 70 may be pulled up to the maximum stretch point so as to attach the hook fasteners 77 for both a wearer having a narrow waist and a wearer having a large waist.
  • each diaper may be put on with appropriate tightness.
  • the tensile stress of the side panels 70 is equal to or smaller than 5 N/50 mm, it is easy to stretch the elastic region 78 up to the maximum stretch point.
  • the tensile stress is smaller than 1 N/50 mm, close contact of the diaper 1 with the wearer might decrease, and when it is greater than 5 N/50 mm, the side panels might need to be pulled by a strong force to stretch the elastic region and it might be difficult to use.
  • each side panel 70 in the lateral direction X is about 15 to about 25% of the dimension of the diaper 1 in the lateral direction X. More specifically, the side panels elastically stretch and contract in a relatively small range of the dimension of the diaper 1 in the lateral direction X, thereby the maximum stretch point may be easily sensed. Additionally, when putting the diaper 1 on a wearer, the wearer lies on the wearer's back so as to place the buttocks on the diaper 1 so as to regulate the stretch and contraction of the side panel elastics by the weight or friction of the wearer's body. Therefore, when the side panels elastically stretch and contract in a wide range of the dimension of the diaper 1 in the lateral direction X, it is not easy to control the maximum stretch point of the elastics. However, such inconvenience may be prevented by attaching the elastics only in the side panels 70, i.e., the chassis 10 is free of waist elastics being stretchable and contractible in the lateral direction in the rear waist region 12, as best seen in Fig. 2.
  • the side panels 70 continuously extend from the rear end edge 15 in the rear waist region 12 to the crotch region 13, and the dimension from the front end edge 70a to the rear end edge 70b in the longitudinal direction Y is about 180 to about 300 mm. In a specific configuration of this embodiment, it is about 240 mm (refer to FIG.2).
  • the dimension of the rear waist region 12 in the longitudinal direction Y is about 260 to about 320 mm. In a specific configuration of this embodiment, it is about 281.8 mm.
  • the dimension of the front waist region 11 in the longitudinal direction Y is about 170 to about 240 mm. In a specific configuration of this embodiment, it is about 193.5 mm.
  • the dimension of the front and rear waist regions 11, 12 in the longitudinal direction Y is a dimension from the front and rear end edges 14, 15 of the chassis 10 to a border with the crotch region 13 at which a dimension of the chassis 10 in the lateral direction X begins to reduce. Since the side panels 70 extend substantially across the entire region of the rear waist region 12 in the longitudinal direction Y, it is possible to keep the diaper 1 in close contact with the wearer not only in the waist opening defined by the front and rear end edges 14, 15, but also in the vicinity of the leg opening formed by the side edge 16 of the crotch region 13.
  • the side panels 70 are larger than the dimension of the front waist region 11 in the longitudinal direction Y, the side panels 70 may be connected in the entire front waist region 11 in the longitudinal direction Y, thereby keeping the entirety of the front waist region 11 in close contact with the wearer.
  • the side panels 70 may be disposed only on the side of the rear end edge 15 or only on the side of the crotch region 13 in the rear waist region 12, or a plurality of side panels spaced from each other in the longitudinal direction Y may be disposed.
  • the side panels 70 have a dimension in the lateral direction X smaller than the dimension in the longitudinal direction Y. Therefore, even when the side panels 70 are large in the longitudinal direction Y, which is located in the substantially entire region of the rear waist region 12, since the dimension in the lateral direction X is small relative to the dimension in the longitudinal direction Y, the side panels are easy to be pulled in the lateral direction X so as to reach the maximum stretch point at an early stage. Additionally, both the waist opening and leg openings are provided with stretch properties.
  • the side panels 70 when the side panels 70 extend in the substantially entire region of the rear waist region 12 in the longitudinal direction Y, compared to the side panels 70 with a small dimension in the longitudinal direction Y, it might be difficult to handle it and to connect to the front waist region 11. Particularly, when the side panels 70 extend in a wide range in the lateral direction X, it might be necessary to hold the side panels 70 and spread both arms widely in the lateral direction, which makes connecting the side panels 70 to the front waist region 11 more difficult. However, according to this embodiment, since there is the maximum stretch point in the side panels 70 at a relatively early stage, even if the side panels 70 enlarge in the longitudinal direction Y, it is easy to engage the side panels 70 with the front waist region 11.
  • the leg elastics 51 are attached in the crotch region 13 of the diaper 1 and the second end edges 51b thereof are located inboard of the side panels 70 in the lateral direction X. More specifically, the second end edges 51b of the leg elastics 51 are held between a pair of side panels 70, and an imaginary extension line extending in the lateral direction X so as to connect front end edges 70a of the pair of side panels 70 intersects with the leg elastics 51.
  • the second end edges 51b of the leg elastics 51 are also pulled outwardly in the lateral direction X together with the side panels 70, thereby the lateral edges 16 of the chassis 10 in which the leg elastics 51 are attached may stay in close contact about the wearer's legs.
  • strand-like or string-like elastics are used to form the elastic region in the side panels 70 in this embodiment, it is also possible to use an elastically stretchable film, an elastically stretchable nonwoven fabric, or the like so as to define the elastic region.
  • a loop element or the like may also be separately attached in the front waist region 11. If a loop element or the like is attached in the backsheet 30 as the first fastening component, a breathable plastic sheet or the like may be used as the backsheet 30.
  • an article normally used in this type of field such as an adhesive tape or the like may be used as long as the rear waist region 12 of the article may be connected to the front waist region 11.
  • an adhesive tape or the like used as the second fastening component
  • a plastic sheet or the like may be used as the first fastening component, for example.
  • FIG.7 is a developed plan view similar to Fig. 2 and illustrates a disposable diaper of another embodiment of the present invention.
  • This embodiment has a characteristic in that waist elastics 80 extending in the lateral direction X are attached in the rear waist region 12.
  • the components except for this characteristic are similar to those of the above-mentioned embodiment, and a detailed description thereof will be omitted.
  • a plurality of waist elastics 80 is attached along the rear end edge 15 of the diaper 1.
  • the waist elastics 80 are contractibly attached in a stretched state in the lateral direction X between the topsheet 20 and leakage-barrier sheet 50.
  • elastic threads of 940 dtex may be attached to the topsheet 20 and/or the leakage-barrier sheet 50 while being stretched to 2.5 times their original length.
  • the waist elastics 80 By attaching the waist elastics 80, it is possible to keep the diaper 1 in much closer contact with the waist corresponding to movements of the wearer.
  • the waist elastics 80 When the tensile stress of the waist elastics 80 is larger than the tensile stress of the side panel elastics 73, when the diaper 1 is put on, the waist elastics 80 may be arranged to elongate after the side panels 70 reaches the maximum stretch point. Since there is a sense of the maximum stretch point in the side panels 70, it is possible to readily put the diaper 1 on the wearer. Additionally, the waist elastics 80 allow the diaper 1 to come in close contact with the wearer's waist. It should be noted here that the tensile stress of the elastics will be measured alone, before the elastics are attached to the nonwoven fabric.
  • the waist elastics 80 are attached in the center of the rear waist region 12 in the lateral direction X, the buttocks or waist of the wearer overlap the waist elastics 80 when the diaper 1 is being put on. Accordingly, the weight of the wearer suppresses the extension of the waist elastics 80, the waist elastics 80 is ensured to extend after the maximum stretch point occurs in the side panels 70.
  • the waist elastics 80 and the side panel elastics 73 attached in the elastic region 78 of the side panels 70 are divided by an inner non-elastic region 79a or the like. More specifically, the waist elastics 80 and side panel elastics 73 are not continuous and separately stretch and contract. When these elastics are continuous, since both the side panel elastics 73 and waist elastics 80 are stretched when the side panels 70 are pulled in the lateral direction X, it might be difficult to obtain a sense of the maximum stretch point. In contrast, in this embodiment, the waist elastics 80 and side panel elastics 73 are divided by the non-elastic region or the like, thereby it is easy to obtain a sense of the maximum stretch point by the side panel elastics 73.
  • the tensile stress of the region in which the waist elastics 80 are attached equal to the tensile stress of the region in which the side panel elastics 73 are attached. In such configuration, it is possible to substantially equally stretch the region in which the waist elastics 80 are attached and the elastic region 78 of the side panels 70.
  • a disposable wearing article having a longitudinal direction and a lateral direction comprising: a chassis including: a skin facing side, a non-skin facing side opposite thereto, first and second waist regions, and a crotch region located between the first and second waist regions; and a fastening system configured to connect the first and second waist regions, the fastening system including: a first fastening component located on the first waist region, and a second fastening component connectable to the first fastening component and attached in one of a pair of side panels extending from the second waist region in the lateral direction, wherein: the side panels are elastically stretchable and contractible in the lateral direction, each side panel is provided with an elastic region being stretchable and contractible at least in the lateral direction and non-elastic regions located on opposite sides of the elastic region in the lateral direction, a stretch ratio of a dimension of the side panel in the maximum stretched state of the elastic region in the lateral direction is from about 10 to about
  • the aspects described in the above item (I) may include at least the following embodiments, which may be taken in isolation or in combination with one another: (1)
  • the dimension of the side panel in the maximum stretched state of the elastic region in the lateral direction is from about 15 to about 25% of a dimension of the wearing article in the lateral direction.
  • the elastic region has non-stretchable nonwoven fabrics, and a plurality of side panel elastics which are contractibly attached in a stretched state in the lateral direction to the nonwoven fabrics and which are disposed to be spaced from each other in the longitudinal direction.
  • the chassis has waist elastics being stretchable and contractible in the lateral direction in the second waist region.
  • Tensile stress of the side panel elastics is smaller than that of a region in which the waist elastics are attached.
  • the chassis has lateral edges extending in the longitudinal direction, and the first fastening component extends from one of the lateral edges to the other of the lateral edges in the lateral direction.
  • the second fastening component is a hook component, and the first fastening component is a nonwoven fabric to which the hook component is connectable.
  • a dimension of the wearing article in the lateral direction in the maximum stretched state of the elastic region is about 550 to about 1250 mm.
  • a dimension of the side panels in the longitudinal direction is larger than a dimension of the first waist region in the longitudinal direction.
  • each of the leg elastics includes a first end edge located on a side of the first waist region and a second end edge located on a side of the second waist region, and the second end edge is located in the second waist region and located inboard of the side panels in the lateral direction.
  • the side panel elastics are of about 470 to about 700 dtex, are stretched 2 to 3 times their original length in the lateral direction while being attached to the nonwoven fabrics, and are attached at a pitch of about 5 to about 15 mm in the longitudinal direction.
  • the chassis is free of waist elastics being stretchable and contractible in the lateral direction in the second waist region.
  • the second fastening components are attached in the side panels extending from the lateral edges of the chassis of the wearing article, the stretch ratio of the side panels are 10 to 40%, and the tensile stress in the lateral direction is 1 to 5 N/50 mm.
  • the side panels when the side panels are pulled in the lateral direction, they may reach a maximum stretch point at which no further stretch is available relatively soon after they are started to be pulled with a relatively weak force.
  • the second fastening components may be attached to the first fastening component with the side panels pulled to the maximum stretch point, and the landing positions of the second fastening components on the first fastening component are selected based on the size of the wearer's waist.
  • the wearing article will be unlikely to become too tight or too loose and may appropriately stay in close contact with the wearer's waist.
  • the disposable diaper 1 As components of the disposable diaper 1 as one example of disposable wearing articles according to some embodiments of the present invention, various known materials normally used in the related technical field or materials to be developed in the art may be used without limit in addition to the material described in the present description.
  • the terms "first” and "second” are used so as to merely distinguish similar elements, locations, or the like.

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Abstract

A disposable wearing article adapted to appropriately come in close contact with the wearer's waist. A pair of side panels (70) is attached in the lateral edges (16) in the rear waist region (12) of the chassis (10). Each side panel (70) includes the elastic region (78), inner and outer non-elastic regions (79a, 79b) which are not elastically stretchable and contractible. Inner and outer non-elastic regions (79a, 79b) are formed on the opposite lateral portions of the elastic region (78) in the lateral direction (X). Compared to a dimension (Bl) in a contracted state, a dimension (B2) in the maximum stretched state of the elastic region (78) has a stretch ratio of about 10 to about 40% thereof. The tensile stress of the side panels (70) in the lateral direction (X) is to be about 1 to about 5 N/50 mm.

Description

DISPOSABLE WEARING ARTICLE
The present disclosure relates to disposable wearing articles.
Background
Wearing articles used with front and rear waist regions connected to each other with fastening tapes are known. For example, JP 2009-183364 A (PTL 1) discloses a disposable diaper provided with flaps defined by hook members attached in the rear waist region, and the hook members may be connected to an outer sheet of the front waist region so as to form an annular waist opening. The flaps are elasticized by elastic members to be stretchable and contractible in a lateral direction. By elasticizing the flaps, it is possible to keep the diaper in close contact with the wearer's waist.
JP 2009-183364 A
Summary
Some embodiments of the present invention provide a disposable wearing article having a longitudinal direction and a lateral direction.
The article includes a chassis and a fastening system.
The chassis includes a skin facing side, a non-skin facing side opposite to the skin facing side, front and rear waist regions, a first waist region which is one of the front and rear waist regions, a second waist region which is the other thereof, and a crotch region located between the first and second waist regions.
The fastening system is configured to connect the first and second waist regions and includes a first fastening component located on the non-skin facing side of the first waist region and a second fastening component connectable to the first fastening component.
The second fastening component is attached in one of a pair of side panels extending from the second waist region in the lateral direction.
The side panels are elastically stretchable and contractible in the lateral direction.
Each side panel is provided with an elastic region being stretchable and contractible at least in the lateral direction and a non-elastic region located in outer lateral portions of the elastic region in the lateral direction.
A stretch ratio of a dimension of the side panel in a maximum stretched state of the elastic region in the lateral direction is about 10 to about 40% in relation to a dimension of the side panel in a contracted state of the elastic region in the lateral direction.
A tensile stress of the side panel in the lateral direction is about 1 to about 5 N/50 mm.
The term "maximum stretched state" refers to a state in which when the side panel is pulled in the lateral direction against a contracting force of the elastic region, the elastic region is extended to its full length and may not be further extended. It is a "maximum stretch point". It should be noted that it does not involve elongating the side panel until it is ruptured.
FIG.1 is a perspective view illustrating a worn state of a disposable diaper as an example of disposable wearing articles in some embodiments. FIG.2 is a developed plan view seen from a skin facing side of the diaper. FIG.3 is an exploded perspective view of the diaper. FIG.4 is a cross section view taken along IV-IV line of FIG.2. FIG.5(a) is a plan view of a side panel illustrating a contracted state of the side panel. FIG.5(b) is a plan view illustrating a stretched state of the side panel. FIG.6 is a graph illustrating a tensile strength characteristic of the side panel. FIG.7 is a developed plan view similar to Fig. 2 and illustrating a disposable diaper of other embodiments.
A diaper 1 according to some embodiments of the present invention is adapted to be used for adults, and particularly for a person who requires excretion assistance such as a bed-ridden person, a person in a wheel chair, or the like.
Referring to FIG.1, the diaper 1 has a longitudinal direction Y and lateral direction X, and includes a front waist region 11, a rear waist region 12, a crotch region 13 located between the front and rear waist regions 11, 12, front and rear end edges 14, 15 extending in the lateral direction X, and lateral edges 16 extending in the longitudinal direction Y. One of the front and rear waist regions is referred to herein as a first waist region, and the other of the front and rear waist regions is referred to herein as a second waist region. The diaper 1 is formed with a waist opening by engaging hook fasteners 77 of a mechanical fastening system provided in the rear waist region 12 with the front waist region 11, and thereby the diaper 1 may be kept in close contact with the wearer's body.
Referring to FIGs. 2 to 4, the diaper 1 has an imaginary longitudinal center line P-P to bisect a dimension in the lateral direction X so as to be substantially symmetrical about the imaginary longitudinal center line P-P. In the drawings, some reference signs of similar symmetrical components/portions are omitted. In FIGs. 2 to 4, respective elastics are shown in a state when the elastics are stretched against contracting forces thereof.
The diaper 1 includes a liquid permeable topsheet 20 lying on a skin facing side, backsheet 30 lying on a non-skin facing side (garment facing side), a body fluid absorbent structure 40 lying between the topsheet 20 and backsheet 30, and a hardly-liquid permeable or liquid impermeable leakage-barrier sheet 50 located between the absorbent structure 40 and backsheet 30. On the skin facing side of the topsheet 20, a pair of containment sheets 60 is provided being spaced from each other in the lateral direction X and extending in the longitudinal direction Y. The topsheet 20 and backsheet 30 define a chassis 10 of the diaper 1.
As the topsheet 20, for example, at least one of a hydrophilic spunbond nonwoven fabric and a point-bonded nonwoven fabric having a mass per unit area of about 15 to about 35 g/m2, preferably about 18 to about 23 g/m2 may be used. As the backsheet 30, for example, at least one of a spunbond/melt blown/spunbond (hereafter referred to as SMS) nonwoven fabric and a spunbond nonwoven fabric having a mass per unit area of about 10 to about 30 g/m2 may be used.
As the containment sheet 60, for example, an SMS nonwoven fabric having a mass per unit area of about 10 to about 30 g/ m2 may be used. Each containment sheet 60 are laid on the topsheet 20 so that the front and rear end edges 61, 62 of the containment sheet 60 may respectively align with front and rear end edges 21, 22 of the front sheet 20 and be joined to each other by known joining means such as a hot melt adhesive or the like (not illustrated). A proximal edge portion 63 of the containment sheet 60 and the lateral edge portion 33 of the backsheet 30 overlap, and are joined to each other by known joining means such as a hot melt adhesive or the like (not illustrated). A distal edge portion 64 of the containment sheet 60 is laid on the topsheet 20 in a state in which the diaper 1 is expanded in the longitudinal direction Y. In the distal edge portion 64, an elastic 65 extending in the longitudinal direction Y is contractibly attached in a stretched state. Due to the contraction of the elastic 65, the distal edge portion 64 may be spaced apart from the topsheet 20 toward the wearer's skin so as to come into close contact with the wearer's skin. As a result, bodily waste such as feces may be contained inside the containment sheet 60.
The absorbent structure 40 is disposed at least in the crotch region 13. In this embodiment, however, it is arranged to extend from the crotch region 13 into the front and rear waist regions 11, 12, thereby to absorb bodily exudates such as urine or the like in a relatively large range. The absorbent structure 40 is formed by wrapping a liquid absorbent core with a liquid dispersing wrapping sheet such as tissue paper or the like. As the core, fluff wood pulp, superabsorbent polymer particles or a mixture thereof may be used. The core and the wrapping sheet may be joined to each other by known joining means such as a hot melt adhesive or the like (not illustrated).
As the leakage-barrier sheet 50 disposed between the absorbent structure 40 and the backsheet 30, a hardly-liquid permeable, preferably liquid impermeable and breathable plastic film may be used. The leakage-barrier sheet 50 is formed to have a larger area than that of the absorbent structure 40. With such an arrangement, it is possible to prevent the exudates such as urine or the like having been absorbed by the absorbent structure 40 from leaking outside the diaper 1. The leakage-barrier sheet 50 may be interposed between the wrapping sheet of the absorbent structure 40 and the backsheet 30 and secured by known joining means such as a hot melt adhesive or the like (not illustrated).
Leg elastics 51 are attached to the leakage-barrier sheet 50 on a surface opposite to a surface facing the backsheet 30. The leg elastics 51 are joined to at least one of the leakage-barrier sheet 50 and the containment sheet 60 by known joining means such as a hot melt adhesive or the like (not illustrated). The leg elastics 51 extends in the longitudinal direction Y along the lateral edges 16 in the crotch region 13, and the first end edge 51a located on the side of the front waist region 11 extends to the front waist region 11, and the second end edge 51b located on the side of the rear waist region 12 extends to the rear waist region 12 and is contractibly attached in a stretched state in the longitudinal direction Y. As the leg elastics 51, a plurality of thread, string, or strand elastics may be used.
A pair of side panels 70 is attached in the lateral edges 16 in the rear waist region 12 of the chassis 10. Each side panel 70 includes a first sheet 71 lying on the skin facing side, a second sheet 72 lying on the non-skin facing side, and a plurality of side panel elastics 73 disposed between these sheets. Inner edges 71a, 72a of the first and second sheets 71, 72 are joined to the chassis 10 via the connecting sheet 74. Specifically, an inner edge 72a of the second sheet 72 is joined to one end portion of the connecting sheet 74, and at the other end portion of the connecting sheet 74, an opposite surface facing the second sheet 72 is joined to the backsheet 30. Outer edges 71b, 72b of the first and second sheets 71, 72 are joined between a first tab sheet 75 and a second tab sheet 76. The hook fastener 77 is secured on the skin facing side of the second tab sheet 76. In order to secure the second tab sheet 76 and hook fastener 77, or in order to join the respective sheets, known joining means such as a hot melt adhesive or fusion bonding may be used (not illustrated).
The first and second sheets 71, 72 are substantially the same in shape and size and joined to each other by known joining means such as a hot melt adhesive or fusion bonding (not illustrated). As material thereof, for example, an SMS nonwoven fabric having a mass per unit area of about 10 to about 30 g/ m2 may be used. These first and second sheets 71, 72 are made of non-stretchable nonwoven fabrics. The term "non-stretchable" means that it is not elastically stretchable and contractible, and when it is used for the diaper 1, it does not change any dimension affecting a circumferential dimension of the waist opening when putting the diaper 1 on a wearer even if it is pulled by at least a normal force in the lateral direction X. Even if such a normal force dissolves the entanglement and/or fusion bonding of fibers of the nonwoven fabric to cause it to elongate slightly non-elastically, this is considered to be non-stretchable. This is because it does not affect the circumferential dimension of the waist opening.
A plurality of side panel elastics 73 is attached to at least one of the first and second sheets 71, 72. The respective side panel elastics 73 are contractibly attached at predetermined intervals in the longitudinal direction Y and in a stretched state in the lateral direction X. With such an arrangement, an elastic region 78 being elastically stretchable and contractible in the lateral direction X is defined. Specifically, the elastic region 78 is a region in which the side panel elastics 73 are stretchable and contractible. When the both ends of the panel elastics 73 are subjected to cut back in the manufacturing process, the both end portions in which no stretching and contracting force is exerted, that is, the relaxed end portions, do not define the elastic region 78. As the side panel elastics 73, for example, thread, string or strand elastics of about 470 to about 940 dtex may be used, and these elastics are attached to the first and second sheets 71, 72 at a pitch of about 5 to about 15 mm in the longitudinal direction Y, while being stretched to about 2 to about 3 times their original length in the lateral direction X. In a specific configuration of this embodiment, the side panel elastics 73 of about 620 dtex are attached to the first and second sheets 71, 72 at a pitch of about 10 mm in the longitudinal direction Y, while being stretched to about 2.6 times their original length in the lateral direction X.
As materials of the connecting sheet 74 and first tab sheet 75, for example, a spunbond nonwoven fabric having a mass per unit area of about 30 to about 50 g/m2 may be used. As a material of the second tab sheet 76, for example, a spunbond nonwoven fabric having a mass per unit area of about 30 to about 50 g/m2 may be used.
In the side panel 70 above, inner and outer non-elastic regions 79a, 79b which are not elastically stretchable and contractible are formed on opposite sides of the elastic region 78 in the lateral direction X. In the outer non-elastic region 79b, two hook fasteners 77 being spaced from each other in the longitudinal direction Y are attached. By engaging the hook fastener 77 with the nonwoven fabric of the backsheet 30 of the front waist region 11, the front and rear waist regions 11, 12 are connected, and it may be put on the wearer in the form of a pant type diaper. The hook fastener 77 is also referred to as a second fastening component, and the backsheet 30 of the front waist region 11 is also referred to as a first fastening component. By using the backsheet 30 as the first fastening component, the first fastening component may be defined over an entire region in the lateral direction X from one side edge 16 to the other side edge 16 thereby to engage the hook fastener 77 to any portions of the non-skin facing side of the chassis 10. Since the hook fastener 77 may be connected in a wide range of the front waist region 11, the connection between the front and rear waist regions 11, 12 may be appropriately adjusted based on the body shape or physical condition of the wearer so as to keep it in close contact with the wearer. Moreover, since other members are not required for use of the backsheet 30 as the first fastening component, the production cost may be reduced accordingly. The first fastening component may be attached on the elective area of the front waist region 11 or in the substantially entirety of the front waist region 11.
In the diaper 1, in the chassis 10, a dimension A1 of the front waist region 11 in the lateral direction X and a dimension A2 of the rear waist region 12 in the lateral direction X are substantially equal. In the crotch region 13, a dimension in the lateral direction X is smaller than dimensions A1 and A2. The dimensions A1 and A2 are about 350 to about 650 mm. In a specific configuration of this embodiment, it is about 435 mm (refer to FIG.2).
Referring to FIG.5(a), the dimension B1 of the side panel 70 in the lateral direction X is about 80 to about 200 mm in a contracted state of the elastic region 78. In a specific configuration of this embodiment, it is about 120 mm. It should be noted here that the dimension of the side panel 70 in the lateral direction X is a dimension from the outer end edge 76a of the second tab sheet 76 to the side edge 16 of the chassis 10, and the term "contracted state" of the elastic region78 refers to a state in which the side panel elastics 73 are relaxed (i.e., without being subject to external forces) and elastically contract, creating gathers in the first and second sheets 71, 72, and in which a dimension of the side panel 70 in the lateral direction X is measured without pulling the side panel elastics 73 in the lateral direction X. Referring to FIG.5(b), the dimension B2 of the side panel 70 in the lateral direction X when the elastic region 78 is in a maximum stretched state is about 100 to about 300 mm. In a specific configuration of this embodiment, it is about 165mm. The "maximum stretched state" of the elastic region 78 refers to a state in which when the side panel 70 is pulled in the lateral direction X against a contracting force of the elastic region 78, the elastic region 78 is elongated to its full length and no further elongation is possible without rupture. In other words, it is a maximum stretch point. In this embodiment, it refers to a state in which the side panel elastics 73 are elastically stretched in the lateral direction X until the gathers created in the first and second sheets 71, 72 disappears. It should be noted here that the term "maximum stretched state" does not involve a state in which the side panel 70 is stretched until the first and/or second sheets 71, 72 in the side panels 70 is/are ruptured.
Compared to the dimension B1 in the contracted state, the dimension B2 of the side panels 70 in the maximum stretched state of the elastic region 78 has a stretch ratio of about 10 to about 40%, preferably about 15 to about 35%. The stretch ratio is calculated by using an equation as follows: (dimension B2 - dimension B1) / dimension B2 x 100. In a specific configuration of this embodiment, the stretch ratio is about 27%.
While the dimension A1 is substantially equal to A2 in a specific configuration of this embodiment, it is preferable that the dimension A1 be equal to or greater than about 50% of (dimension A2 + dimension B2). When the dimension A1 of the front waist region 11 in the lateral direction X is too smaller than that of the rear waist region 12, the region to be engaged with the hook fastener 77 might be too small and accordingly it might be difficult to engage the hook fastener 77 with the front waist region 11. Additionally, a size range of the waist opening defined by the front and rear waist regions 11, 12 might be narrower, and it might be difficult to put the diaper on a wearer particularly having a large waist size. In this embodiment, however, by setting the dimension A1 to the above range, a large area to be engaged with the hook fastener 77 may be ensured so that the diaper may be put on wearers having a variety of waist sizes.
The dimension B2 is about 15 to about 25% of the dimension of the diaper 1 in the lateral direction X. The dimension of the diaper 1 in the lateral direction X is defined as follows: (dimension A2) + (dimension B2) x 2. More specifically, it is defined as follows: dimension B2 / (dimension A2 + dimension B2 x 2) x 100 = about 15 to about 25%. In a specific configuration of this embodiment, it is 165 mm / (435 mm + 165 mm x 2) x 100 = about 21.6%.
The tensile stress of the side panel 70 in the lateral direction X as described above is about 1 to about 5 N/50 mm, preferably about 1 to about 4 N/50 mm.
<Measurement method of tensile stress>
The tensile stress of the side panels 70 was obtained based on a result of a tension test measured with INSTRON (model: 5564) of Instron Japan Company Ltd. Referring to FIG.5(a), as a sample S, the side panel in a contracted state was cut out into a piece in which a dimension in the lateral direction X was 150 mm and a dimension in the longitudinal direction Y was 50 mm for use. The sample S that was cut out had the elastic region 78 and inner and outer non-elastic regions 79a, 79b. The sample S was held at the end portions thereof between a pair of chucks of a measuring device. The parts held by the chucks were outboard of the elastic region 78, more specifically, the inner and outer non-elastic regions 79a, 79b. In the measuring device in which the sample S was set as described above, the chuck was pulled at a rate of 300 mm/min in opposite directions to each other. The measurement result is illustrated in a graph in FIG.6. In the graph in FIG.6, the longitudinal axis indicates the load and the lateral axis indicates the tensile elongation.
Referring to FIG.6, an increase in the load suddenly became large at the tensile elongation of about 45 mm. More specifically, the inclination of the graph suddenly become steep, and it is understood that the maximum stretch point occurred at this point. This was substantially the same as the dimension B2 when the side panel 70 was stretched in the lateral direction X in FIG.5(b). In FIG.6, the elongation exceeds 45 mm indicates a condition in which the entanglement or adhesion among fibers in the nonwoven fabric of the first and second sheets 71, 72 of the side panel 70 was broken. The tensile stress (N/50 mm) was obtained from a load (N) with 90% elongation in the graph in FIG.6 in which a tensile elongation (dimension B2) of the maximum stretch point is set to 100%. In this specific example, 90% elongation was 45 mm x 90% = 40.5 mm. The load of the tensile elongation of 40.5 mm in the graph in FIG.6 was about 2.5N, and the tensile stress was about 2.5 N/50 mm.
The diaper 1 may be put on a bed-ridden adult, for example. The dimension of the diaper 1 in the maximum stretched state of the elastic regions 78 in the lateral direction X, i.e., a dimension from one of the outer end edges 76a of the second tab sheet 76 to the other of the outer end edges 76a is represented by the dimension A2 + 2 x dimension B2, and it is about 550 to about 1250 mm in a specific configuration of this embodiment. With such a dimensional setting, the diaper 1 may be preferably used as a diaper for adults applicable to the wearers having a variety of body sizes. In order for putting the diaper 1 on the wearer, for example, the wearer is to lie down sideways on a bed. The diaper 1 is spread out flatwise on the bed (referring to FIG.2) such that when the wearer lies on the wearer's back, the diaper 1 underlies the buttocks of the wearer. Then, the wearer is turned over to the opposite side so as to lie sideways, and after the diaper 1 is aligned, the wearer is turned over to lie on the wearer's back again. When the wearer is turned over as described above, it is preferred to align the diaper 1 so as to extend straight in the lateral direction X without bending or folding the side panel 70. Since the side panels 70 extend from the lateral edges 16 of the diaper 1 corresponding to lateral portions of the wearer, it is easy to adjust a position of the diaper 1 according to the wearer's body by pulling the side panels 70.
After the diaper 1 is disposed on the buttocks of the wearer, the front waist region 11 of the diaper 1 is placed on the abdominal part of the wearer, and then the hook fasteners 77 formed in the side panels 70 are engaged with the backsheet 30 of the front waist region 11. In doing so, the second tab sheet 76 of each side panel 70 is pulled outwardly in the lateral direction X. Since the stretch ratio of the side panels 70 is about 10 to about 40%, each side panel 70 may be stretched to its full length at a relatively early stage after the side panel 70 started to be pulled and stop elongating any longer. This is because the elongation of the side panel elastics 73 is regulated by the first and second sheets 71, 72 being non-stretchable. This is a maximum stretch point. As described above, since the maximum stretch point occurs at a relatively early stage after the side panel 70 started to be pulled, in order for the wearer to use the diaper 1, the side panels 70 may be stretched up to the maximum stretch point, and then the hook fasteners 77 may be attached to the backsheet 30.
If the maximum stretch point does not occur, it is difficult for the user to decide how much to pull the side panels 70. If it is pulled too much, the diaper 1 becomes too tight, or if it was not pulled adequately, the diaper 1 might be too loose. Particularly, in diapers for adults having a large dimension of the chassis 10 in the lateral direction X, the dimension of the side panels in the lateral direction X is generally large, and the side panels easily elongate in the lateral direction X considerably. Therefore, if there is no sense of the maximum stretch point at an early stage, the side panels continue to be pulled in the lateral direction, which makes it more difficult to decide how much to pull and hard to use. However, according to this embodiment, the side panels 70 are stretched up to the maximum stretch point and then the hook fasteners 77 are engaged at appropriate positions on the other (e.g., front) waist region, it is possible that the size of the waist opening defined by the front and rear waist regions 11, 12 may be in a predetermined range, thereby the diaper 1 will be unlikely too tight or too loose every time the diaper is changed. When the stretch ratio of the side panels 70 is smaller than 10%, tight contact of the diaper 1 with the wearer might decrease, and when it is greater than 40%, a sense of the maximum stretch point might not be obtained.
Since the diaper 1 as described above is provided with the elasticized side panels 70, it may be used for wearers having a variety of waist sizes. Compared to diapers for babies, diapers for adults cover a wide range of waist sizes of the wearer. Waist sizes of adults considerably vary based on gender, and there is also a great difference in physique based on individuals. By using the elasticized side panels 70, the diaper 1 may be applicable to a wide range of waist sizes of the wearers. The side panels 70 may be pulled up to the maximum stretch point so as to attach the hook fasteners 77 for both a wearer having a narrow waist and a wearer having a large waist. Thus, even when the diapers 1 are used for a large number of wearers, for example, at hospitals, nursing-care homes or the like, each diaper may be put on with appropriate tightness.
Since the tensile stress of the side panels 70 is equal to or smaller than 5 N/50 mm, it is easy to stretch the elastic region 78 up to the maximum stretch point. When the tensile stress is smaller than 1 N/50 mm, close contact of the diaper 1 with the wearer might decrease, and when it is greater than 5 N/50 mm, the side panels might need to be pulled by a strong force to stretch the elastic region and it might be difficult to use.
The dimension B2 of each side panel 70 in the lateral direction X is about 15 to about 25% of the dimension of the diaper 1 in the lateral direction X. More specifically, the side panels elastically stretch and contract in a relatively small range of the dimension of the diaper 1 in the lateral direction X, thereby the maximum stretch point may be easily sensed. Additionally, when putting the diaper 1 on a wearer, the wearer lies on the wearer's back so as to place the buttocks on the diaper 1 so as to regulate the stretch and contraction of the side panel elastics by the weight or friction of the wearer's body. Therefore, when the side panels elastically stretch and contract in a wide range of the dimension of the diaper 1 in the lateral direction X, it is not easy to control the maximum stretch point of the elastics. However, such inconvenience may be prevented by attaching the elastics only in the side panels 70, i.e., the chassis 10 is free of waist elastics being stretchable and contractible in the lateral direction in the rear waist region 12, as best seen in Fig. 2.
The side panels 70 continuously extend from the rear end edge 15 in the rear waist region 12 to the crotch region 13, and the dimension from the front end edge 70a to the rear end edge 70b in the longitudinal direction Y is about 180 to about 300 mm. In a specific configuration of this embodiment, it is about 240 mm (refer to FIG.2). The dimension of the rear waist region 12 in the longitudinal direction Y is about 260 to about 320 mm. In a specific configuration of this embodiment, it is about 281.8 mm. The dimension of the front waist region 11 in the longitudinal direction Y is about 170 to about 240 mm. In a specific configuration of this embodiment, it is about 193.5 mm. The dimension of the front and rear waist regions 11, 12 in the longitudinal direction Y is a dimension from the front and rear end edges 14, 15 of the chassis 10 to a border with the crotch region 13 at which a dimension of the chassis 10 in the lateral direction X begins to reduce. Since the side panels 70 extend substantially across the entire region of the rear waist region 12 in the longitudinal direction Y, it is possible to keep the diaper 1 in close contact with the wearer not only in the waist opening defined by the front and rear end edges 14, 15, but also in the vicinity of the leg opening formed by the side edge 16 of the crotch region 13. Furthermore, since the side panels 70 are larger than the dimension of the front waist region 11 in the longitudinal direction Y, the side panels 70 may be connected in the entire front waist region 11 in the longitudinal direction Y, thereby keeping the entirety of the front waist region 11 in close contact with the wearer. The side panels 70 may be disposed only on the side of the rear end edge 15 or only on the side of the crotch region 13 in the rear waist region 12, or a plurality of side panels spaced from each other in the longitudinal direction Y may be disposed.
As described above, the side panels 70 have a dimension in the lateral direction X smaller than the dimension in the longitudinal direction Y. Therefore, even when the side panels 70 are large in the longitudinal direction Y, which is located in the substantially entire region of the rear waist region 12, since the dimension in the lateral direction X is small relative to the dimension in the longitudinal direction Y, the side panels are easy to be pulled in the lateral direction X so as to reach the maximum stretch point at an early stage. Additionally, both the waist opening and leg openings are provided with stretch properties.
As described above, when the side panels 70 extend in the substantially entire region of the rear waist region 12 in the longitudinal direction Y, compared to the side panels 70 with a small dimension in the longitudinal direction Y, it might be difficult to handle it and to connect to the front waist region 11. Particularly, when the side panels 70 extend in a wide range in the lateral direction X, it might be necessary to hold the side panels 70 and spread both arms widely in the lateral direction, which makes connecting the side panels 70 to the front waist region 11 more difficult. However, according to this embodiment, since there is the maximum stretch point in the side panels 70 at a relatively early stage, even if the side panels 70 enlarge in the longitudinal direction Y, it is easy to engage the side panels 70 with the front waist region 11.
The leg elastics 51 are attached in the crotch region 13 of the diaper 1 and the second end edges 51b thereof are located inboard of the side panels 70 in the lateral direction X. More specifically, the second end edges 51b of the leg elastics 51 are held between a pair of side panels 70, and an imaginary extension line extending in the lateral direction X so as to connect front end edges 70a of the pair of side panels 70 intersects with the leg elastics 51. By establishing the positional relationship as described above, when the side panels 70 are pulled outwardly in the lateral direction X so as to connect to the front waist region 11, the second end edges 51b of the leg elastics 51 are also pulled outwardly in the lateral direction X together with the side panels 70, thereby the lateral edges 16 of the chassis 10 in which the leg elastics 51 are attached may stay in close contact about the wearer's legs.
While the strand-like or string-like elastics are used to form the elastic region in the side panels 70 in this embodiment, it is also possible to use an elastically stretchable film, an elastically stretchable nonwoven fabric, or the like so as to define the elastic region. While the backsheet 30 of the front waist region 11 is used as the first fastening component in this embodiment, a loop element or the like may also be separately attached in the front waist region 11. If a loop element or the like is attached in the backsheet 30 as the first fastening component, a breathable plastic sheet or the like may be used as the backsheet 30. While the hook fastener is used as the second fastening component in this embodiment, an article normally used in this type of field such as an adhesive tape or the like may be used as long as the rear waist region 12 of the article may be connected to the front waist region 11. When an adhesive tape or the like is used as the second fastening component, a plastic sheet or the like may be used as the first fastening component, for example.
FIG.7 is a developed plan view similar to Fig. 2 and illustrates a disposable diaper of another embodiment of the present invention. This embodiment has a characteristic in that waist elastics 80 extending in the lateral direction X are attached in the rear waist region 12. The components except for this characteristic are similar to those of the above-mentioned embodiment, and a detailed description thereof will be omitted.
Referring to FIG.7, along the rear end edge 15 of the diaper 1, a plurality of waist elastics 80 is attached. The waist elastics 80 are contractibly attached in a stretched state in the lateral direction X between the topsheet 20 and leakage-barrier sheet 50. As the waist elastics 80, elastic threads of 940 dtex may be attached to the topsheet 20 and/or the leakage-barrier sheet 50 while being stretched to 2.5 times their original length.
By attaching the waist elastics 80, it is possible to keep the diaper 1 in much closer contact with the waist corresponding to movements of the wearer. When the tensile stress of the waist elastics 80 is larger than the tensile stress of the side panel elastics 73, when the diaper 1 is put on, the waist elastics 80 may be arranged to elongate after the side panels 70 reaches the maximum stretch point. Since there is a sense of the maximum stretch point in the side panels 70, it is possible to readily put the diaper 1 on the wearer. Additionally, the waist elastics 80 allow the diaper 1 to come in close contact with the wearer's waist. It should be noted here that the tensile stress of the elastics will be measured alone, before the elastics are attached to the nonwoven fabric.
Since the waist elastics 80 are attached in the center of the rear waist region 12 in the lateral direction X, the buttocks or waist of the wearer overlap the waist elastics 80 when the diaper 1 is being put on. Accordingly, the weight of the wearer suppresses the extension of the waist elastics 80, the waist elastics 80 is ensured to extend after the maximum stretch point occurs in the side panels 70.
The waist elastics 80 and the side panel elastics 73 attached in the elastic region 78 of the side panels 70 are divided by an inner non-elastic region 79a or the like. More specifically, the waist elastics 80 and side panel elastics 73 are not continuous and separately stretch and contract. When these elastics are continuous, since both the side panel elastics 73 and waist elastics 80 are stretched when the side panels 70 are pulled in the lateral direction X, it might be difficult to obtain a sense of the maximum stretch point. In contrast, in this embodiment, the waist elastics 80 and side panel elastics 73 are divided by the non-elastic region or the like, thereby it is easy to obtain a sense of the maximum stretch point by the side panel elastics 73.
It is also possible to make the tensile stress of the region in which the waist elastics 80 are attached equal to the tensile stress of the region in which the side panel elastics 73 are attached. In such configuration, it is possible to substantially equally stretch the region in which the waist elastics 80 are attached and the elastic region 78 of the side panels 70.
The disclosure described above may be summarized as follows:
(I) A disposable wearing article having a longitudinal direction and a lateral direction, the article comprising:
a chassis including:
a skin facing side, a non-skin facing side opposite thereto,
first and second waist regions, and
a crotch region located between the first and second waist regions; and
a fastening system configured to connect the first and second waist regions, the fastening system including:
a first fastening component located on the first waist region, and
a second fastening component connectable to the first fastening component and attached in one of a pair of side panels extending from the second waist region in the lateral direction, wherein:
the side panels are elastically stretchable and contractible in the lateral direction,
each side panel is provided with an elastic region being stretchable and contractible at least in the lateral direction and non-elastic regions located on opposite sides of the elastic region in the lateral direction,
a stretch ratio of a dimension of the side panel in the maximum stretched state of the elastic region in the lateral direction is from about 10 to about 40% in relation to a dimension of the side panel in a contracted state of the elastic region in the lateral direction, and
a tensile stress of the side panel in the lateral direction is about 1 to about 5 N/50 mm.
The aspects described in the above item (I) may include at least the following embodiments, which may be taken in isolation or in combination with one another:
(1) The dimension of the side panel in the maximum stretched state of the elastic region in the lateral direction is from about 15 to about 25% of a dimension of the wearing article in the lateral direction.
(2) The elastic region has
non-stretchable nonwoven fabrics, and
a plurality of side panel elastics which are contractibly attached in a stretched state in the lateral direction to the nonwoven fabrics and which are disposed to be spaced from each other in the longitudinal direction.
(3) The chassis has waist elastics being stretchable and contractible in the lateral direction in the second waist region.
(4) Tensile stress of the side panel elastics is smaller than that of a region in which the waist elastics are attached.
(5) The chassis has lateral edges extending in the longitudinal direction, and
the first fastening component extends from one of the lateral edges to the other of the lateral edges in the lateral direction.
(6) The second fastening component is a hook component, and the first fastening component is a nonwoven fabric to which the hook component is connectable.
(7) A dimension of the wearing article in the lateral direction in the maximum stretched state of the elastic region is about 550 to about 1250 mm.
(8) A dimension of the side panels in the longitudinal direction is larger than a dimension of the first waist region in the longitudinal direction.
(9) Leg elastics are contractibly attached in a stretched state in the longitudinal direction to the crotch region,
each of the leg elastics includes a first end edge located on a side of the first waist region and a second end edge located on a side of the second waist region, and
the second end edge is located in the second waist region and located inboard of the side panels in the lateral direction.
(10) The side panel elastics are of about 470 to about 700 dtex, are stretched 2 to 3 times their original length in the lateral direction while being attached to the nonwoven fabrics, and are attached at a pitch of about 5 to about 15 mm in the longitudinal direction.
(11) The chassis is free of waist elastics being stretchable and contractible in the lateral direction in the second waist region.
The described aspects and/or embodiments provide one or more of the following effects:
According to one or more embodiments of the present invention, the second fastening components are attached in the side panels extending from the lateral edges of the chassis of the wearing article, the stretch ratio of the side panels are 10 to 40%, and the tensile stress in the lateral direction is 1 to 5 N/50 mm. With such an arrangement, when the side panels are pulled in the lateral direction, they may reach a maximum stretch point at which no further stretch is available relatively soon after they are started to be pulled with a relatively weak force. The second fastening components may be attached to the first fastening component with the side panels pulled to the maximum stretch point, and the landing positions of the second fastening components on the first fastening component are selected based on the size of the wearer's waist. Thus, the wearing article will be unlikely to become too tight or too loose and may appropriately stay in close contact with the wearer's waist.
As components of the disposable diaper 1 as one example of disposable wearing articles according to some embodiments of the present invention, various known materials normally used in the related technical field or materials to be developed in the art may be used without limit in addition to the material described in the present description. In the description and claims of the present application, the terms "first" and "second" are used so as to merely distinguish similar elements, locations, or the like.
This application claims the benefit of Japanese Application No. 2011-203740 the entire disclosure of which is incorporated by reference herein.

Claims (12)

  1. A disposable wearing article having a longitudinal direction and a lateral direction, the article comprising:
    a chassis including:
    a skin facing side, a non-skin facing side opposite thereto,
    first and second waist regions, and
    a crotch region located between the first and second waist regions; and
    a fastening system configured to connect the first and second waist regions, the fastening system including:
    a first fastening component located on the first waist region, and
    a second fastening component connectable to the first fastening component and attached in one of a pair of side panels extending from the second waist region in the lateral direction, wherein:
    the side panels are elastically stretchable and contractible in the lateral direction,
    each side panel is provided with an elastic region being stretchable and contractible at least in the lateral direction and non-elastic regions located on opposite sides of the elastic region the lateral direction,
    a stretch ratio of a dimension of the side panel in the maximum stretched state of the elastic region in the lateral direction is from about 10 to about 40% in relation to a dimension of the side panel in a contracted state of the elastic region in the lateral direction, and
    a tensile stress of the side panel in the lateral direction is about 1 to about 5 N/50 mm.
  2. The disposable wearing article according to Claim 1, wherein the dimension of the side panel in the maximum stretched state of the elastic region in the lateral direction is from about 15 to about 25% of a dimension of the wearing article in the lateral direction.
  3. The disposable wearing article according to Claim 1 or 2, wherein the elastic region has
    non-stretchable nonwoven fabrics, and
    a plurality of side panel elastics which are contractibly attached in a stretched state in the lateral direction to the nonwoven fabrics and which are disposed to be spaced from each other in the longitudinal direction.
  4. The disposable wearing article according to any one of Claims 1 to 3, wherein the chassis has waist elastics being stretchable and contractible in the lateral direction in the second waist region.
  5. The disposable wearing article according to Claim 4, wherein a tensile stress of the side panel elastics is smaller than that of a region in which the waist elastics are attached.
  6. The disposable wearing article according to any one of Claims 1 to 5, wherein the chassis has lateral edges extending in the longitudinal direction, and
    the first fastening component extends from one of the lateral edges to the other of the lateral edges in the lateral direction.
  7. The disposable wearing article according to any one of Claims 1 to 6, wherein the second fastening component is a hook component, and the first fastening component is a nonwoven fabric to which the hook component is connectable.
  8. The disposable wearing article according to any one of Claims 1 to 7, wherein a dimension of the wearing article in the lateral direction in the maximum stretched state of the elastic region is about 550 to about 1250 mm.
  9. The disposable wearing article according to any one of Claims 1 to 8, wherein a dimension of the side panels in the longitudinal direction is larger than a dimension of the first waist region in the longitudinal direction.
  10. The disposable wearing article according to any one of Claims 1 to 9, wherein
    leg elastics are contractibly attached in a stretched state in the longitudinal direction to the crotch region,
    each of the leg elastics includes a first end edge located on a side of the first waist region and a second end edge located on a side of the second waist region, and
    the second end edge is located in the second waist region and located inboard of the side panels in the lateral direction.
  11. The disposable wearing article according to any one of Claims 3 to 10, wherein the side panel elastics are of about 470 to about 700 dtex, are stretched 2 to 3 times their original length in the lateral direction while being attached to the nonwoven fabrics, and are attached at a pitch of about 5 to about 15 mm in the longitudinal direction.
  12. The disposable wearing article according to any one of Claims 1 to 3, wherein the chassis is free of waist elastics being stretchable and contractible in the lateral direction in the second waist region.
PCT/JP2012/005807 2011-09-16 2012-09-13 Disposable wearing article WO2013038667A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201280044171.3A CN103826586B (en) 2011-09-16 2012-09-13 Disposable shorts

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011203740A JP5787689B2 (en) 2011-09-16 2011-09-16 Disposable wearing items
JP2011-203740 2011-09-16

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WO2013038667A1 true WO2013038667A1 (en) 2013-03-21

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JP2014036902A (en) * 2013-11-27 2014-02-27 Uni Charm Corp Disposable wearing article
CN104055631A (en) * 2014-07-08 2014-09-24 潍坊金一鸣卫生用品有限公司 Improved disposable paper diaper loop pasting band part
JP6017081B1 (en) * 2016-05-10 2016-10-26 ユニ・チャーム株式会社 Absorbent articles

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JP2005522273A (en) * 2002-04-12 2005-07-28 スリーエム イノベイティブ プロパティズ カンパニー Elastic closure tab
JP2006518633A (en) * 2003-02-24 2006-08-17 スリーエム イノベイティブ プロパティズ カンパニー Elastic fastening tab, fastening system, and manufacturing method thereof
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CN103826586A (en) 2014-05-28
CN103826586B (en) 2016-03-30
JP2013063183A (en) 2013-04-11

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