WO2013046703A1 - Article de protection jetable - Google Patents

Article de protection jetable Download PDF

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Publication number
WO2013046703A1
WO2013046703A1 PCT/JP2012/006210 JP2012006210W WO2013046703A1 WO 2013046703 A1 WO2013046703 A1 WO 2013046703A1 JP 2012006210 W JP2012006210 W JP 2012006210W WO 2013046703 A1 WO2013046703 A1 WO 2013046703A1
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WO
WIPO (PCT)
Prior art keywords
waist
elastic sheet
lateral direction
longitudinal direction
end edge
Prior art date
Application number
PCT/JP2012/006210
Other languages
English (en)
Inventor
Tatsuya Hashimoto
Toshifumi Otsubo
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
Publication of WO2013046703A1 publication Critical patent/WO2013046703A1/fr

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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 articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49011—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region
    • A61F13/49012—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region the elastic means being elastic panels
    • 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 articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/4902—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
    • A61F2013/49025—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material having multiple elastic strands
    • A61F2013/49026—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material having multiple elastic strands with variable spacing
    • 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 articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/4902—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
    • A61F2013/49036—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material having a inelastic zone by deactivating the elastic property
    • 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 articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F2013/49039—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located around the target zone

Definitions

  • the present disclosure relates to disposable wearing articles. More particularly, the present disclosure relates to disposable wearing articles such as disposable diapers, disposable training pants, disposable urinary incontinence pants, disposable sanitary panties and the like.
  • Disposable wearing articles are known to have a longitudinal direction and a lateral direction being perpendicular to each other, and include a skin-facing side, a non-skin-facing side, a front waist region and a rear waist region, a crotch region arranged between the front and rear waist regions, front waist elastics extending in the lateral direction in the front waist region, rear waist elastics extending in the lateral direction in the rear waist region, and a liquid-absorbent structure disposed in the crotch region so as to absorb bodily fluid.
  • JP 4421012 B discloses a disposable diaper which includes rear waist elastics being cut at the portion where the rear waist elastics would overlap with the liquid-absorbent structure.
  • This disposable diaper prevents the liquid-absorbent structure from shrinking in the lateral direction due to a contractile force of the rear waist elastics.
  • the inventor(s) have recognized that because the disposable diaper disclosed in PTL 1 includes the rear waist elastics which are partially cut, there is a likelihood that gaps are formed between the liquid-absorbent structure and the wearer's skin, which leads to leakage of body waste.
  • a disposable wearing article having a longitudinal direction and a lateral direction being perpendicular to each other.
  • the article includes: a skin-facing side and a non-skin-facing side; a front waist region and a rear waist region; a crotch region extending between the front and rear waist regions; waist members disposed in the front and rear waist regions; a crotch member disposed in the crotch region; a liquid-absorbent structure provided in the crotch member; and waist elastics attached to the waist members and extending in the lateral direction.
  • the waist members each includes an elastic sheet being elastically stretchable at least in the lateral direction and has an outer end edge and an inner end edge opposed to each other in the longitudinal direction.
  • the waist elastics each includes first waist elastics disposed on a side of the outer end edge of the corresponding waist member, and second waist elastics disposed on a side of the inner end edge of the corresponding waist member.
  • the second waist elastics are absent in respective regions of the liquid-absorbent structure.
  • the elastic sheets each includes lateral edges opposed to each other in the lateral direction and an outer end edge and an inner end edge opposed to each other in the longitudinal direction.
  • the inner end edges are each secured to the crotch member at least in a center region.
  • the elastic sheets are each deformed to constrict at least in the center region such that a dimension of the center region in the longitudinal direction becomes smaller than a dimension of each of the lateral edges in the longitudinal direction when a tensile load is applied between the lateral edges.
  • FIG. 1 is a perspective view of a disposable diaper as one example of disposable wearing articles according to one or more embodiments of the present invention.
  • FIG. 2 is a development view of the diaper where a part of the diaper is cut away.
  • FIG. 3 is a development view of the diaper where a part of a crotch member is cut away, and is similar to Fig. 2.
  • FIG. 4 is an enlarged cross-sectional view taken along line IV-IV of FIG. 2.
  • FIGs. 5(a) and 5(b) are views of an elastic sheet.
  • FIG. 5(a) illustrates the elastic sheet where the tensile load is not applied.
  • FIG. 5(b) illustrates the elastic sheet where the tensile load is applied in the lateral direction.
  • FIG. 5(a) illustrates the elastic sheet where the tensile load is not applied.
  • FIG. 5(b) illustrates the elastic sheet where the tensile load is applied in the lateral direction.
  • FIG. 5(a) illustrates the elastic
  • FIG. 6 is a partial plan view of the diaper illustrating a deformation of a rear waist member.
  • FIG. 7 is a development view of a diaper according to a modification, and is similar to FIG. 3.
  • FIG. 8(a) is a plan view of an example of the elastic sheet.
  • FIG. 8(b) is a cross-sectional view taken along line VIIIb-VIIIb of FIG. 8(a).
  • FIG. 9 is a cross-sectional view of another example of the elastic sheet.
  • FIG. 10 is a graph illustrating a relation between stretch and a contractile force in a lateral direction X where the elastic sheet is stretched in the lateral direction X.
  • FIG. 10 is a graph illustrating a relation between stretch and a contractile force in a lateral direction X where the elastic sheet is stretched in the lateral direction X.
  • FIG. 11 is a graph illustrating a relation between stretch and the contractile force in the lateral direction X where a sample nonwoven fabric is stretched in the lateral direction X.
  • FIG. 12 is a side view of a detection unit of a device that measures hardness of the elastic sheet and the sample nonwoven fabric.
  • X denotes a lateral direction while Y denotes a longitudinal direction perpendicular to the lateral direction X.
  • the diaper 10 includes a skin-facing side facing the wearer's body and a non-skin-facing side opposite to the skin-facing side.
  • the diaper 10 includes an annular waist member 11 extending in a waist circumferential direction and a crotch member 40 being coupled to the waist member 11 and extending in the longitudinal direction Y.
  • the waist member 11 is formed by coupling a front waist member 20 and a rear waist member 30 together in the form of an endless belt.
  • the diaper 10 includes a waist opening 15 defined by a front outer end edge 201 of the front waist member 20 and a rear outer end edge 311 of the rear waist member 30.
  • the diaper 10 also includes a pair of leg openings 16 each defined by one of lateral edges 40s of the crotch member 40, a front inner end edge 202 of the front waist member 20, and waist inner end edges 322, 323 of the rear waist member 30.
  • P denotes an imaginary longitudinal center line dividing the dimension of the developed diaper 10 in a lateral direction X in two while Q denotes an imaginary lateral center line dividing the dimension of the developed diaper 10 in the longitudinal direction Y in two.
  • the diaper 10 is symmetrical relative to the imaginary longitudinal center line P.
  • Z denotes a thickness direction perpendicular to both longitudinal direction Y and lateral direction X.
  • the diaper 10 in the configuration it would assume when placed on a wearer as shown in FIG. 1, includes a front waist region 12 and a rear waist region 13 facing each other on the skin-facing side.
  • the front waist member 20 is disposed in the front waist region 12.
  • the rear waist member 30 is disposed in the rear waist region 13.
  • the diaper 10 includes a crotch region 14 extending between the front waist region 12 and the rear waist region 13 in the longitudinal direction Y.
  • the crotch member 40 is disposed in the crotch region 14.
  • the front waist member 20 includes the front outer end edge 201, the front inner end edge 202, and front lateral edges 203.
  • the front outer end edge 201 is relatively far from the imaginary lateral center line Q and extends in the lateral direction X.
  • the front inner end edge 202 is relatively close to the imaginary lateral center line Q and extends in the lateral direction X.
  • the front lateral edges 203 connect the front outer end edge 201 and the front inner end edge 202 together and extend in the longitudinal direction Y, so that the front waist member 20 has a rectangular shape.
  • the rear waist member 30 includes a waist covering portion 31 and a buttock covering portion 32 contiguous to the waist covering portion 31.
  • the waist covering portion 31 has a rectangular shape being longer in the lateral direction X than in the longitudinal direction Y.
  • the waist covering portion 31 is formed in the same shape and size as the front waist member 20. That is, the waist covering portion 31 includes a waist outer end edge 311 (which is the rear outer end edge described above), the waist inner end edge 312, and waist lateral edges 313.
  • the waist outer end edge 311 is relatively far from the imaginary lateral center line Q and extends in the lateral direction X.
  • the waist inner end edge 312 is relatively close to the imaginary lateral center line Q and extends in the lateral direction X.
  • the waist lateral edges 313 connect the waist outer end edge 311 and the waist inner end edge 312 together and extend in the longitudinal direction Y, so that the waist covering portion 31 has a rectangular shape.
  • the buttock covering portion 32 is formed in an approximately trapezoidal shape extending from the waist inner end edge 312 of the waist covering portion 31 towards the imaginary lateral center line Q. That is, the buttock covering portion 32 includes a buttock outer end edge 321, which matches the waist inner end edge 312, a buttock inner end edge 322 extending in the lateral direction X, and buttock lateral edges 323.
  • the buttock lateral edges 323 connect the buttock outer end edge 321 and the buttock inner end edge 322 together and slantingly extend in the longitudinal direction Y, so that, the buttock covering portion 32 has the approximately trapezoidal shape.
  • the buttock covering portion 32 covers the buttocks of the wearer.
  • the front lateral edges 203 of the front waist member 20 and the waist lateral edges 313 of the rear waist member 30 are opposite to each other at the skin-facing sides.
  • the front lateral edges 203 and the waist lateral edges 313 overlap each other and are coupled by a series of joining portions 17 such as fusion bonded portions in the longitudinal direction Y.
  • the front waist member 20 and the rear waist member 30 each includes a non-elastic, but stretchable sheet 50, which is elastically non-stretchable in the lateral direction X and the longitudinal direction Y, and an elastic sheet 55, which is elastically stretchable in the lateral direction X and the longitudinal direction Y.
  • This diaper 10 described in this embodiment includes two non-elastic sheets 50.
  • the two non-elastic sheets 50 each includes a first non-elastic, but stretchable sheet 51 and a second non-elastic, but stretchable sheet 52 facing each other at a portion 56 in the thickness direction Z.
  • the first non-elastic sheet 51 is arranged on the skin-facing side at the portion 56.
  • the second non-elastic sheet 52 is arranged on the non-skin-facing side at the portion 56.
  • a first non-elastic sheet 51f which forms the front waist member 20, has a rectangular shape that is longer in the lateral direction X than in the longitudinal direction Y.
  • the first non-elastic sheet 51b which forms the rear waist member 30 is disposed over the entire buttock covering portion 32.
  • the first non-elastic sheet 51b is also disposed over a portion of the waist covering portion 31, the portion extending away from the imaginary lateral center line Q from the waist inner end edge 312 of the waist covering portion 31 adjacent to the buttock covering portion 32.
  • the second non-elastic sheet 52f which forms the front waist member 20, has a rectangular shape that is longer in the lateral direction X than in the longitudinal direction Y.
  • the second non-elastic sheet 52b which forms the rear waist member 30, is disposed over the entire buttock covering portion 32 and the entire waist covering portion 31.
  • These second non-elastic sheets 52b and 52f each have an outer portion 53 and a folded inner portion 54.
  • the folded inner portions 54 are folded from the outer end edges 201 and 311 of the outer portions 53 toward the skin-facing side.
  • the outer portions 53 cover the entire non-skin-facing sides of the front and rear waist members 20 and 30.
  • the folded inner portions 54 cover parts (adjacent the outer end edges 201 and 311) of the skin-facing sides of the outer portions 53.
  • an elastic sheet 55f covers the skin-facing side of an outer end edge 519f of the first non-elastic sheet 51f.
  • a front end flap 47f of the crotch member 40 covers the skin-facing side of an outer end edge 559f of the elastic sheet 55f.
  • the crotch member 40 has a front edge 40f with a skin-facing side covered with the folded inner portion 54 of the second non-elastic sheet 52.
  • a rear end flap 47b of the crotch member 40 covers a skin-facing side of an outer end edge 519b of the first non-elastic sheet 51b.
  • the crotch member 40 has a rear end edge 40b with a skin-facing side covered with an elastic sheet 55b.
  • the elastic sheet 55b has an outer end edge 559b covered with the folded inner portion 54 of the second non-elastic sheet 52.
  • the first non-elastic sheets 51b and 51f and the second non-elastic sheets 52b and 52f may be made of a spunbond-meltblown-spunbond (SMS) fibrous nonwoven fabric, a spunbond fibrous nonwoven fabric, an air-through fibrous nonwoven fabric, a plastic sheet, or a laminate of these material that are substantially non-stretchable and have a mass per unit area of about 15 to about 30 g/m 2 .
  • SMS spunbond-meltblown-spunbond
  • These sheets 51b, 51f, 52b, and 52f are joined by joining means such as a hot-melt adhesive applied over at least one inner side of the sheets 51b and 52b, and of the sheets 51f and 52f.
  • the elastic sheets 55 respectively includes the elastic sheet 55f located in the front waist region 12 and the elastic sheet 55b located in the rear waist region 13. These elastic sheets 55b and 55f each have a rectangular shape that is longer in the lateral direction X than in the longitudinal direction Y.
  • the elastic sheets 55b and 55f are each made of an elastically stretchable fibrous nonwoven fabric.
  • the elastically stretchable fibrous nonwoven fabric may be a fibrous nonwoven fabric such as a spunbond fibrous nonwoven fabric, a melt blown fibrous nonwoven fabric, a heat rolled fibrous nonwoven fabric, an SMS fibrous nonwoven fabric, an airlaid fibrous nonwoven fabric, and an air-through fibrous nonwoven fabric, or any combination of these.
  • the elastically stretchable fibrous nonwoven fabric is formed of: for example, an elastomer resin such as polystyrene-based or polyurethane-based resin; a thermoplastic resin such as polyethylene, polypropylene, polyester, and acryl; or a core-sheath or side-by-side conjugate fibers made of, for example, polyethylene/polypropylene, polyethylene/polyethylene terephthalate, and polypropylene/polyethylene terephthalate.
  • the elastic sheets 55f and 55b each preferably have a greater stretchability in the lateral direction X than in the longitudinal direction Y.
  • the elastic sheet 55f at the front waist region 12 includes the outer end edge 559f, an inner end edge 557f, and lateral edges 55s.
  • the outer end edge 559f is relatively far from the imaginary lateral center line Q and extends in the lateral direction X.
  • the inner end edge 557f is relatively close to the imaginary lateral center line Q and extends in the lateral direction X.
  • the lateral edges 55s couple the outer end edge 559f and the inner end edge 557f together and extend in the longitudinal direction Y.
  • the elastic sheet 55f has a rectangular shape.
  • the outer end edge 559f and the inner end edge 557f are opposite to each other in the longitudinal direction Y.
  • the elastic sheet 55b at the rear waist region 13 includes the outer end edge 559b, an inner end edge 557b, and lateral edges 55s.
  • the outer end edge 559b is relatively far from the imaginary lateral center line Q and extends in the lateral direction X.
  • the inner end edge 557b is relatively close to the imaginary lateral center line Q and extends in the lateral direction X.
  • the lateral edges 55s couple the outer end edge 559b and the inner end edge 557b together and extend in the longitudinal direction Y.
  • the elastic sheet 55b has a rectangular shape.
  • the outer end edge 559b and the inner end edge 557b are opposite to each other in the longitudinal direction Y.
  • an example of the elastic sheet 55 is formed in such a manner that urethane fibers 551 and polyolefin fibers 552 are mixed with each other.
  • a process for making the elastic sheet 55 containing the urethane and polyolefin fibers 551, 552 is well known in the art, and the disclosure of JP 2004-244791 A is hereby incorporated by reference.
  • the subject is the same.
  • the urethane fibers 551 are brighter than the polyolefin fibers 552 in FIG. 8(a), and the urethane fibers 551 and the polyolefin fibers 552 are enlarged 50 times.
  • the urethane fibers 551 are elastically stretchable in the longitudinal direction Y and the lateral direction X, and are mainly disposed at a center in a thickness direction Z.
  • the polyolefin fibers 552 are provided for the purpose of providing strength and fine texture, and are mainly disposed at top and bottom sides in the thickness direction Z.
  • the urethane fibers 551 appear on the top side and the bottom side, and the polyolefin fibers 552 are visible through the urethane fibers 551.
  • the polyolefin fibers 552 and the urethane fibers 551 are mixed with each other.
  • the elastic sheet 55 illustrated in FIGs. 8(a) and 8(b) preferably has the mass per unit area of about 25 to about 60 g/m 2 , and more preferably has a mass per unit area of about 26 to about 34 g/m 2 .
  • the fibers 551 and 552 constituting the elastic sheet 55 each preferably have a diameter of about 20 to about 25 um and a fineness of about 2.5 to about 5.0 dtex.
  • the elastic sheet 55 is, as illustrated in FIG. 9 for example, formed by stacking a nonwoven fabric 553 formed of urethane fibers and two nonwoven fabrics 554 formed of polyolefin fibers in a thickness direction. More specifically, the elastic sheet 55 is formed by stacking in a manner that the nonwoven fabric 553 is sandwiched by the two nonwoven fabrics 554. The nonwoven fabric 553 and the two nonwoven fabrics 554 are bonded together by hot embossing for example.
  • the non-elastic sheets 51f and 52f and the elastic sheet 55f in the front waste region 12, for example the non-elastic sheets 51f and 52f to which no external force is applied are bonded to the elastic sheet 55f to which no external force is applied with a hot-melt adhesive not shown.
  • the non-elastic sheets 51f and 52f to which no external force is applied may be bonded, with the hot-melt adhesive not shown, to the elastic sheet 55f deformed by applying the tensile load between the lateral edges 55s to have the center region 55c constricted in such a manner that the dimension in the longitudinal direction Y at each of the lateral edges 55s becomes larger than the dimension in the longitudinal direction Y at the center region 55c.
  • the non-elastic sheet 52b to which no external force is applied is bonded to the elastic sheet 55b to which no external force is applied with a hot-melt adhesive not shown.
  • the non-elastic sheet 52b to which no external force is applied may be bonded, with the hot-melt adhesive not shown, to the elastic sheet 55b deformed by applying the tensile load between the lateral edges 55s to have the center region 55c constricted in such a manner that the dimension in the longitudinal direction Y at each of the lateral edges 55s is larger than the dimension in the longitudinal direction Y at the center region 55c.
  • the bonding between the elastic sheet 55f and the non-elastic sheets 51f and 52f, as well as the bonding between the elastic sheet 55b and the non-elastic sheet 52b is not limited to that with the hot-melt adhesive but may also be achieved using a sonic seal, a heat seal, and the like.
  • the elastic sheet 55 has, as illustrated in FIG. 5(a), a rectangular shape in a natural state when no external force is applied.
  • the elastic sheet 55 has a width W0 in the lateral direction X and length L0 in the longitudinal direction Y.
  • the elastic sheet 55 in the state where a tensile load F is applied to the elastic sheet 55 in the lateral direction X (a length direction of the elastic sheet 55), the elastic sheet 55 is deformed as follows: the elastic sheet 55 has a constriction (necking) such that a length L2 in the longitudinal direction Y at least in the center region 55c, where the imaginary longitudinal center line P is located, is smaller than a length L1 of each of the lateral edges 55s in the longitudinal direction Y; and the length L1 in the longitudinal direction Y in the state where the tensile load F is applied between the lateral edges 55s is slightly smaller than the length L0 in the longitudinal direction Y in the natural state.
  • necking such that a length L2 in the longitudinal direction Y at least in the center region 55c, where the imaginary longitudinal center line P is located, is smaller than a length L1 of each of the lateral edges 55s in the longitudinal direction Y
  • the elastic sheet 55 used for the diaper 10 is as follows:
  • the elastic sheet 55 in the natural state had the width W0 in the lateral direction X equal to or more than 150 mm and the length L0 in the longitudinal direction Y of 80 mm.
  • the elastic sheet 55 is formed in such a manner that the polyolefin fibers 552 and the urethane fibers 551 are mixed together.
  • the lateral edges 55s of the elastic sheet 55 were respectively coupled to a pair of chucks (not shown) in a tensile tester (AG-1 made by Shimadzu Corporation in Japan) (a distance between the pair of chucks in an initial state was 150 mm). This pair of chucks were gradually moved away from each other by moving either one of the chucks.
  • the center region 55c had the length L2 of 68 mm in the longitudinal direction Y.
  • the constriction in the longitudinal direction Y was 12 mm. This distance between the chucks was determined on the assumption that the elastic sheet 55 was used in the diaper 10 that includes the front waist member 20 and the rear waist member 30 each having a dimension of 400 mm in the lateral direction X.
  • the center region 55c had the length L2 of 55 mm in the longitudinal direction Y.
  • the constriction in the longitudinal direction Y was 25 mm. This distance between the chucks was determined assuming that the elastic sheet 55 was used in the diaper 10 that includes the front waist member 20 and the rear waist member 30 each having a dimension of 500 mm in the lateral direction X.
  • the center region 55c had the length L2 of 47 mm in the longitudinal direction Y.
  • constriction in the longitudinal direction Y was 33 mm. This distance between the chucks was determined assuming that the elastic sheet 55 was used in the diaper 10 that includes the front waist member 20 and the rear waist member 30 each having a dimension of 600 mm in lateral direction X.
  • the center region 55c had the length L2 of 42 mm in the longitudinal direction Y.
  • constriction in the longitudinal direction Y was 38 mm. This distance between the chucks was determined assuming that the elastic sheet 55 was used in the diaper 10 that includes the front waist member 20 and the rear waist member 30 each having a dimension of 650 mm in the lateral direction X.
  • the elastic sheet 55 in the natural state had the width W0 of 150 mm in the lateral direction X.
  • a tensile load was applied such that a resultant width W1 in the lateral direction X was 325 mm, in other words, when a tensile load was applied such that the resultant width W1 in the lateral direction X was 2.17 times as large as that in the natural state, a dimension of the center region 55c in the longitudinal direction Y reduces from 80 mm to 42 mm.
  • the dimension of the center region 55c in the longitudinal direction Y reduced by 47.5% compared with that in the natural state.
  • the first non-elastic sheet 51 and the second non-elastic sheet 52 are bonded together in the entire opposing portion 56, where the first non-elastic sheet 51 and the second non-elastic sheet 52 face each other, with a hot-melt adhesive applied over at least one of the sheets 51 and 52.
  • the elastic sheet 55f has the outer end edge 559f secured to the second non-elastic sheet 52f at least in the center region 55c.
  • the elastic sheet 55f has the entire outer end edge 559f secured to the outer portion 53 of the second non-elastic sheet 52 by securing means (not shown) such as a hot-melt adhesive.
  • the elastic sheet 55b has the outer end edge 559b secured to the second non-elastic sheet 52b at least in the center region 55c.
  • the elastic sheet 55b has the entire outer end edge 559b secured to the outer portion 53 of the second non-elastic sheet 52 and the folded inner portion 54 by securing means (not shown) such as a hot-melt adhesive.
  • the elastic sheet 55f has at least the inner end edge 557f secured to the crotch member 40 at least in the center region 55c by the securing means 801.
  • the elastic sheet 55f is secured to a non-skin-facing side of the crotch member 40 by securing means 801 such as a hot-melt adhesive at the entire portion overlapped with the crotch member 40 as illustrated by a set of wavy lines in FIG. 3.
  • the securing means 801 forms a bonded region 80f between the elastic sheet 55f and the crotch member 40.
  • the elastic sheet 55b has at least the inner end edge 557b secured to the crotch member 40 at least in the center region 55c by the securing means 802.
  • the elastic sheet 55b is secured to the skin-facing side of the crotch member 40 by securing means 802 such as a hot-melt adhesive at a portion that is overlapped with the crotch member 40 and located on the side of an inner end edge 557b as illustrated by another set of wavy lines in FIG. 3.
  • the securing means 802 forms a bonded region 80b between the elastic sheet 55b and the crotch member 40.
  • the crotch member 40 has a rectangular shape that is longer in longitudinal direction Y than in lateral direction X.
  • the crotch member 40 is defined by the front end edge 40f extending in the lateral direction X, the rear end edge 40b extending in the lateral direction X, and the lateral edges 40s that connect the front end edge 40f and the rear end edge 40b together and extend in the longitudinal direction Y.
  • the crotch member 40 includes a liquid-absorbent structure 40A.
  • the liquid-absorbent structure 40A includes a topsheet 41 disposed on the skin-facing side, a backsheet 42 disposed on the non-skin-facing side, and a liquid-absorbent core (core material) 43 interposed between the topsheet 41 and the backsheet 42.
  • the topsheet 41 entirely covers the skin-facing side of the core 43 and may be formed of a liquid-permeable fibrous nonwoven fabric.
  • the backsheet 42 entirely covers the non-skin-facing side of the core 43 and may be formed of a hardly liquid-permeable or liquid-impermeable fibrous nonwoven fabric or plastic film.
  • the topsheet 41 and the backsheet 42 each may be formed of, for example, a spunbond fibrous nonwoven fabric, a spunbond-meltblown-spunbond (SMS) fibrous nonwoven fabric, an air-through fibrous nonwoven fabric, or a point-bond fibrous nonwoven fabric.
  • SMS spunbond-meltblown-spunbond
  • the topsheet 41 and the backsheet 42 extend beyond end edges 43f and 43b of the core 43 in the longitudinal direction Y.
  • the over extending portions are overlapped each other and bonded together with a hot-melt adhesive, thus forming front and rear end flaps 47f and 47b extending beyond the and edges 43f and 43b of the core 43.
  • the topsheet 41 and the backsheet 42 extend beyond lateral edges 43s of the core 43 in the lateral direction X.
  • the over extending portions are overlapped each other and bonded together by a hot-melt adhesive, thus forming the side flap 47s extending from the lateral edges 43s of the core 43.
  • the core 43 has a rectangular shape that is longer in the longitudinal direction Y than in the lateral direction X.
  • the core 43 extends in the longitudinal direction Y in the crotch region 14.
  • the core 43 includes, for example, absorbent polymer particles 48 and hydrophilic fibers 49.
  • the absorbent polymer particles 48 may be formed from a non-water-soluble and water swellable polymer such as a starch-based, acrylic acid-based, or amino acid-based material in a particulate or fiber-like shape with absorption capacity at least more than 10 times its own mass.
  • the hydrophilic fibers 49 may be formed of at least one of natural pulp fibers such as wood fluff pulp, recycled fibers such as rayon staple, and a mixture of these fibers.
  • the crotch member 40 includes, on its lateral edges 40s, a plurality of leg elastics 44 arranged between the topsheet 41 and the backsheet 42.
  • the leg elastics 44 are of thread, string or strand and are arranged to extend in the longitudinal direction Y in a stretched state.
  • the leg elastics 44 are attached to at least one of the topsheet 41 and the backsheet 42 by a hot-melt adhesive (not shown).
  • the crotch member 40 includes a pair of leakage-barrier sheets 45 which are symmetrical relative to the imaginary longitudinal center line P.
  • the pair of leakage-barrier sheets 45 are folded at the sides close to the imaginary longitudinal center line P to form a pair of sleeves 45a extending in the longitudinal direction Y.
  • the sleeves 45a include a plurality of thread, string or strand cuff elastics 46 contractibly attached in a stretched state.
  • Each of the cuff elastics 46 extends in the longitudinal direction Y and is secured to at least one of the leakage-barrier sheet 45 on the skin-facing side and the leakage-barrier sheet 45 on the non-skin-facing side by a hot-melt adhesive (not shown).
  • the front end flap 47f in the front waist region 12 is inserted between the elastic sheet 55f and the folded inner portion 54 of the second non-elastic sheet 52 in the thickness direction Z.
  • the front end flap 47f is bonded to the folded inner portion 54 of the second non-elastic sheet 52 and to the elastic sheet 55f with a hot-melt adhesive respectively on the skin-facing side and the non-skin-facing side.
  • the rear end flap 47b in the rear waist region 13 is inserted between the elastic sheet 55b and the outer portion 53 of the second non-elastic sheet 52 in the thickness direction Z.
  • the rear end flap 47b is bonded to the elastic sheet 55b and to the outer portion 53 of the second non-elastic sheet 52 with a hot-melt adhesive respectively on the skin-facing side and the non-skin-facing side.
  • the front waist member 20 includes a thread, string or strand front waist elastics 60 extending in the lateral direction X and contractibly attached in a stretched state.
  • the front waist elastics 60 include front first waist elastics 61 and front second waist elastics 62.
  • the front first waist elastics 61 are arranged on the side of the outer end edge 201.
  • the front second waist elastics 62 are arranged on the side of the inner end edge 202.
  • the front first waist elastics 61 are contractibly attached in a stretched state between the outer portion 53 of the second non-elastic sheet 52f and the folded inner portion 54.
  • the front first waist elastics 61 are secured by a hot-melt adhesive applied over at least one of the outer portion 53 and the folded inner portion 54.
  • the second non-elastic sheet 52f has a dimension in the lateral direction X that is larger than a dimension of the elastic sheet 55f in the lateral direction X, a contractile force of the front first waist elastics 61 makes the dimension of the second non-elastic sheet 52f in the lateral direction X approximately the same as the dimension of the elastic sheet 55f in the lateral direction X.
  • the front second waist elastics 62 are contractibly attached in a stretched state between the first non-elastic sheet 51 and the outer portion 53 of the second non-elastic sheet 52.
  • the front second waist elastics 62 are secured by a hot-melt adhesive applied over at least one of these sheets 51 and 52.
  • the first non-elastic sheet 51f has a dimension in the lateral direction X that is larger than a dimension of the elastic sheet 55f in the lateral direction X, a contractile force of the front second waist elastics 62 makes the dimension of the first non-elastic sheet 51f in the lateral direction X approximately the same as the dimension of the elastic sheet 55f in the lateral direction X.
  • the front waist elastics 60 may have a fineness of about 470 to about 780 dtex and a tensile ratio of about 2.5 to about 3.0 times.
  • the rear waist member 30 includes, on its waist covering portion 31, thread, string, or strand rear waist elastics 70 extending in the lateral direction X and contractibly attached in a stretched state.
  • the rear waist elastics 70 include rear first waist elastics 71 that are arranged at the side of the outer end edge 311 and rear second waist elastics 72 that are arranged at the side of the inner end edge 312.
  • the rear first waist elastics 71 are attached in a stretched state between the outer portion 53 of the second non-elastic sheet 52b and the folded inner portion 54.
  • the rear first waist elastics 71 are secured by a hot-melt adhesive applied over at least one of the outer portion 53 and the folded inner portion 54.
  • the second non-elastic sheet 52b has a dimension in the lateral direction X that is larger than a dimension of the elastic sheet 55b in the lateral direction X, a contractile force of the rear first waist elastics 71 makes the dimension of the second non-elastic sheet 52b in the lateral direction X approximately the same as the dimension of the elastic sheet 55b in the lateral direction X.
  • the rear second waist elastics 72 are attached in a stretched state between the first non-elastic sheet 51 and the outer portion 53 of the second non-elastic sheet 52.
  • the rear second waist elastics 72 are secured by a hot-melt adhesive applied over at least one of these sheets 51 and 52.
  • the first non-elastic sheet 51b has a dimension in the lateral direction X that is larger than a dimension of the elastic sheet 55b in the lateral direction X, a contractile force of the rear second waist elastics 72 makes the dimension of the first non-elastic sheet 51b in the lateral direction X approximately the same as the dimension of the elastic sheet 55b in the lateral direction X.
  • the rear waist elastics 70 may have a fineness of about 470 to about 780 dtex and a tensile ratio of about 2.5 to 3.0 times.
  • the buttock covering portion 32 also includes thread, string, or strand buttock covering elastics 73 extending in the lateral direction X and contractibly attached in a stretched state.
  • the buttock covering elastics 73 may have a fineness of about 470 to about 780 dtex and a tensile ratio of about 1.5 to 2.5 times.
  • the front and rear second waist elastics 62 and 72 and the buttock covering elastics 73 are cut off in elastic free regions 79f and 79b, which are indicated with crossed lines as shown in FIG. 2, so as not to exert contractile force in the elastic free regions 79f and 79b.
  • the front and rear waist elastics 62 and 72 and the buttock covering elastics 73 are cut off in the elastic free regions 79f and 79b where the front and rear waist elastics 62 and 72 and the buttock covering elastics 73 would be overlapped with the core 43 in the thickness direction.
  • the elastic free regions 79f and 79b are thus provided.
  • the elastic free region 79f has a dimension in the lateral direction X that is smaller than a dimension of the bonded region 80f in the lateral direction X.
  • the elastic free region 79b has a dimension in the lateral direction X that is smaller than a dimension of the bonded region 80b in the lateral direction X.
  • the front and rear second waist elastics 62 and 72 are absent in the regions 79f and 79b of the liquid-absorbent structure 40A. This prevents the liquid-absorbent structure 40A from shrinking(gathering) in the lateral direction X due to contractile forces of the front and rear second waist elastics 62 and 72.
  • the elastic sheet 55 has the inner end edge 557 secured to the crotch member 40 at least in the center region 55c.
  • the elastic sheet 55 is deformed to constrict at least in the center region 55c such that the length L2 of the center region 55c in the longitudinal direction Y becomes smaller than the length L1 of each of the lateral edges 55s in the longitudinal direction Y.
  • the elastic sheet 55 constricts in the center region 55c.
  • the center region of the crotch member 40 is lifted upward with the elastic sheets 55b and 55f, so that the close contact between the liquid-absorbent structure 40A and the wearer's skin is adequately maintained.
  • first waist elastics 61 and 71 are attached on the second non-elastic sheets 52b and 52f.
  • a stiffness of the second non-elastic sheets 52b and 52f is improved with the first waist elastics 61 and 71.
  • the center region of the crotch member 40 is lifted upward by the contractile forces of the elastic sheets 55b and 55f, close contact between the liquid-absorbent structure 40A and the wearer's skin is adequately maintained.
  • the elastic sheets 55b and 55f overlap with the crotch member 40 in the lateral direction X, and the dimensions of the elastic sheets 55b and 55f in the lateral direction X secured to the crotch member 40 are larger than the dimensions of the elastic free regions 79f and 79b in the lateral direction X in the second waist elastics 62 and 72. This allows the contractile forces of the elastic sheets 55b and 55f to press the crotch member 40 against the wearer's skin also in the elastic free regions 79f and 79b.
  • the waist members 20 and 30 include the non-elastic sheets 52f and 52b that are substantially non-stretchable at least in the lateral direction X, and include the first waist elastics 61 and 71 arranged in the non-elastic sheets 52b and 52f. Arrangement of the first waist elastics 61 and 71 improves a stiffness of the non-elastic sheets 52b and 52f. Furthermore, the elastic sheets 55f and 55b have the outer end edge 559 secured to the non-elastic sheets 52f and 52b at least in the center region 55c. Thus, the center region of the crotch member 40 is further lifted when the elastic sheets 55f and 55b are deformed.
  • the elastic sheets 55b and 55f each being made of a elastically stretchable fibrous nonwoven fabric are arranged in the front and rear waist members 20 and 30.
  • the desired fit is provided at the front and rear waist regions 13 and 14. Accordingly, less likely to be left on the wearer's skin by the front and rear waist elastics 60 and 70 made of a thread, string or strand elastic material.
  • the solid line represents the first cycle
  • the dashed line represents the second cycle.
  • the values in Table 1 each represents a magnitude (unit N) of the contractile force of the elastic sheet having the dimension in the lateral direction X of 50 mm in the natural state in a corresponding condition.
  • the elastic sheet 55 was formed in such manner that the urethane fibers 551 and the polyolefin fibers 552 were mixed, and had a urethane fiber 551 content of 47%, the dimension in the thickness direction of 0.98 mm, and a mass per unit area of 32.58 g/m 2 .
  • the contractile force applied in the lateral direction X in the state where the elastic sheet 55 having the dimension in the lateral direction X of 100 mm is stretched in the lateral direction X in the test was equivalent to the force required to enlarge the waist opening 15 for putting on the diaper 10. Meanwhile, the contractile force in the lateral direction X in the state where the force was gradually released after the elastic sheet 55 is stretched to be double in the dimension in the lateral direction X is equivalent to a force applied to the body of a wearer wearing the diaper 10.
  • a nonwoven fabric was prepared that had the dimensions in the longitudinal direction Y and in the lateral direction X in a state where no external force was applied the same as those of the elastic sheet 55.
  • a sample nonwoven fabric was prepared in which rubber threads extending in the lateral direction X were arranged at an equal interval in the longitudinal direction Y.
  • the contractile force approximately the same as the contractile force produced in the elastic sheet 55 stretched to be double in the dimension in the lateral direction X from the state where no external force was applied, in the cycle executed for a second time is produced in the sample nonwoven fabric.
  • the results of the test in which the cycle similar to the one described above was repeated is shown in the lower row of Table 1 and in FIG. 11.
  • the rubber thread was made of polyurethane-elastic fibers formed by a dry spinning method. Eleven urethane-elastic fibers each having a fineness of 470 dtex are arranged on the nonwoven fabric at an interval of 4 mm.
  • the sample nonwoven fabric had the dimension in the thickness direction Z of about 2.5 mm and a mass per unit area of about 70 g/m 2 .
  • the solid line represents the first cycle and the dashed line represents the second cycle.
  • % represents a ratio of the stretched dimension in the lateral direction X of the elastic sheet 55 and the sample nonwoven fabric at the time of measuring the contractile force with respect to the state where the dimension in the lateral direction X being 100 mm.
  • % in Table 1 corresponds to the stretch (mm) in the horizontal axis in FIG. 10 and FIG. 11.
  • the contractile force of the elastic sheet 55 is 1.01 N whereas the contractile force of the sample nonwoven fabric is 1.71 N.
  • the contractile force of the sample nonwoven fabric is approximately 1.7 times as large as the contractile force of the elastic sheet 55.
  • the contractile force of the elastic sheet 55 is 0.47 N whereas the contractile force of the sample nonwoven fabric is 1.22 N. In other words, the contractile force of the sample nonwoven fabric is approximately 2.6 times as large as the contractile force of the elastic sheet 55.
  • the contractile force of the elastic sheet 55 is the same as that of the sample nonwoven fabric.
  • the contractile force applied to the elastic sheet 55 becomes smaller than the contractile force applied to the sample nonwoven fabric.
  • the contractile force in the contraction from the stretched state that is, a state where the diaper 10 is being worn, is smaller in the elastic sheet 55 than in the sample nonwoven fabric.
  • the elastic sheet 55 exerts the contractile force of 0.05 to 0.5 N and more preferably, 0.10 to 0.35 N to return to the 50% contracted state from the state where the elastic sheet 55 is stretched to have the dimension in the lateral direction X twice as long as in the natural state where no external force is applied (the 50% contracted state is a state where the elastic sheet 55 has the dimension in the lateral direction X 50% longer than in the natural state).
  • the elastic sheet 55 can be pressed against the skin of the wearer with an appropriate contractile force. Accordingly, the elastic sheet 55 can be prevented from biting into the skin of the wearer.
  • the contractile force was measured with the same conditions as described above for the elastic sheet 55 illustrated in FIG. 9 formed by stacking the nonwoven fabric 553 made of urethane fibers and two sheets of the nonwoven fabric 554 made of polyolefin fibers in the thickness direction. The results are illustrated in Table 2.
  • this elastic sheet 55 also exerts the contractile force of 0.05 to 0.5 N and more preferably, 0.10 to 0.35 N to return to the 50% contracted state from the state where the elastic sheet 55 is stretched to have the dimension in the lateral direction X doubled.
  • the elastic sheet 55 can be pressed against the skin of the wearer with an appropriate contractile force. Accordingly, the elastic sheet 55 can be prevented from biting into the skin of the wearer.
  • the elastic sheet 55 and the sample nonwoven fabric each have the dimension in the longitudinal direction of 20 mm and the dimension in the lateral direction X of 25 mm in the state where no external force was applied.
  • Such elastic sheet 55 and sample nonwoven fabric were each attached to an attachment plate having longer lengths in the lateral X direction and in the longitudinal Y direction than those of the elastic sheet 55 and the sample nonwoven fabric to measure the hardness of the sheet end edges of the elastic sheet 55 and the sample nonwoven fabric.
  • the elastic sheet 55 and the sample nonwoven fabric were each attached to the attachment plate in such a manner that positions of sheet end edges in the longitudinal direction of the elastic sheet 55 and the sample nonwoven fabric match a position of an end in the longitudinal direction of the attachment plate.
  • the attachment plate includes recesses for attaching the elastic sheet 55 and the sample nonwoven fabric.
  • the recesses include a first recess extending in the lateral direction and a pair of second recesses extending in the longitudinal direction from respective both ends of the first recess.
  • the first recess was formed at a position that is 8 mm away from the position in the attachment plate where the positions of the end of the attachment plate and the sheet end edges of the elastic sheet 55 and the sample nonwoven fabric match.
  • the pair of second recesses was formed to be spaced apart from each other by 17 mm on the attachment plate.
  • the elastic sheet 55 and the sample nonwoven fabric were secured at the first recess and the second recess with a tape.
  • the hardness of the sheet end edges of the elastic sheet 55 and the sample nonwoven fabric was measured with a digital force gauge (SHIMPO FGP-0.2 manufactured by NIDEC-SHIMPO CORPORATION in Japan).
  • This hardness measurement device included a detection unit 81 having a column shape with a diameter of 6 mm as illustrated in FIG. 12.
  • the detection unit 81 included, at the distal end side, a first contact portion 81a and a second contact portion 81b bisected from the base end side toward the distal end side so that one end and the other end contact the sample nonwoven fabric and the elastic sheet 55.
  • the hardness measurement device was pressed against the sheet end edge of each of the elastic sheet 55 and the sample nonwoven fabric at the speed of 100 m/min to thereby measure the hardness of the sheet end edges of the elastic sheet 55 and the sample nonwoven fabric.
  • the sheet end edge of the elastic sheet 55 is softer than the end of the sample nonwoven fabric by approximately 30% in the average value.
  • the end of the elastic sheet 55 is softer than the end of the sample nonwoven fabric. Thus, wearing comfort can be improved.
  • the elastic sheet 55 which is used in the rear waist member 30 secured to the crotch member 40 in the diaper 10 according to at least one embodiment of the present invention, will be described below by referring to FIG. 6 and Table 4.
  • the elastic sheet 55 in the natural state has the width W0 equal to or more than 150 mm in the lateral direction X and the length L0 of 80 mm in the longitudinal direction Y.
  • the elastic sheet 55 is, as in the diaper 10, bonded to the non-elastic sheets 51 and 52 and the crotch member 40.
  • the waist outer end edge 311, which is most distant from the imaginary lateral center line Q, of the rear waist member 30 in the natural state is defined as a reference line L9, in Table 4,
  • A, B, C, D, and E represent distances (mm) from the reference line L9 to a specific portion of the diaper 10 when the tensile load F is applied.
  • a mark "a" is marked on the outer end edge 559 of the elastic sheet 55.
  • A is defined as a distance (mm) from the reference line L9 to the mark "a” when the tensile load F is applied to the diaper 10 such that a pair of the chucks 91 are separated from each other.
  • a mark "b" is marked on a middle position between the outer end edge 559 of the elastic sheet 55 and the elastic sheet bisector 55m in the longitudinal direction Y.
  • B is defined as a distance (mm) from the reference line L9 to the mark "b" when the tensile load F is applied to the diaper 10 by the pair of the chucks 91 moving away from each other in opposite directions.
  • a mark "c" is marked on a position of an elastic sheet bisector 55m that divides the dimension of the elastic sheet 55 in longitudinal direction Y in half.
  • C is defined as a distance (mm) from the reference line L9 to the mark "c" when the tensile load F is applied to the diaper 10 by the pair of the chucks 91 moving away from each other in opposite directions.
  • D in the diaper 10 in the natural state, a mark "d" is marked on a middle position between the inner end edge 557 of the elastic sheet 55 and the elastic sheet bisector 55m in the longitudinal direction Y.
  • D is defined as a distance (mm) from the reference line L9 to the mark "d" when the tensile load F is applied to the diaper 10 by the pair of the chucks 91 moving away from each other in opposite directions.
  • a mark "e” is marked on the inner end edge 557 of the elastic sheet 55 at a side close to the imaginary lateral center line Q in the elastic sheet 55.
  • E is defined as a distance (mm) from the reference line L9 to the mark "e”, when the tensile load F is applied to the diaper 10 by the pair of the chucks 91 moving away from each other in opposite directions.
  • an elastic sheet according to at least one embodiment of the present invention is not limited to the above-described ones.
  • the dimension of the center region in the longitudinal direction Y was 49 mm.
  • the inner end edge side in the center region constricted inward by 1 mm while no change was found at the outer end edge side.
  • the dimension of the center region in the longitudinal direction Y was 47 mm.
  • the inner end edge side in the center region constricted inward by 3 mm while no change was found at the outer end edge side.
  • the dimension of the center region in longitudinal direction Y was 43 mm.
  • the inner end edge side in the center region constricted inward by 4 mm while the outer end edge side constricted inward by 3 mm.
  • the dimension of the center region in longitudinal direction Y was 39 mm.
  • the inner end edge side in the center region constricted inward by 6 mm while the outer end edge side constricted inward by 5 mm.
  • non-elastic sheets 52f and 52b are attached on the non-skin-facing sides of the elastic sheets 55f and 55b, this should not be construed in a limiting sense.
  • a non-elastic sheet may be attached on the skin-facing side of the elastic sheets 55f and 55b.
  • attaching the non-elastic sheets 52f and 52b on the non-skin-facing sides of the elastic sheets 55f and 55b prevents the inner end edge 557 and the outer end edge 559 of the elastic sheets 55f and 55b in a worn state from being exposed to outside. This prevents delamination of the elastic sheets 55f and 55b.
  • Components of the disposable diaper 10 according to at least one embodiment of the present invention may be various kinds of known, or to be developed, materials used for this kind of articles without limitation in addition to the materials described in the description of the present disclosure.
  • terms of "first” and “second” are only used to distinguish, for example, similar components and positions.
  • FIG. 7 illustrates a diaper 100 according to a modification of at least one embodiment of the present invention.
  • the diaper 100 in FIG. 7 has a basic configuration similar to that of the above-described diaper 10. Thus, only the difference(s) will be described below.
  • the elastic sheet 55 and the second non-elastic sheet 52 are bonded together by, for example, a hot-melt adhesive applied over the entire opposing (overlapping) portion.
  • the elastic sheet 55 and the second non-elastic sheet 52 are bonded together by a hot-melt adhesive 805 applied over portions illustrated by wavy lines in the figure.
  • the lateral edges 55s of the elastic sheets 55b and 55f and the lateral edges 52s of the second non-elastic sheet 52 are bonded together while the outer end edges 559f and 559b of the elastic sheets 55b and 55f and the outer portion 53 of the second non-elastic sheet 52 are bonded together.
  • the elastic sheet 55 and the non-elastic sheet 52 are not bonded together.
  • a disposable wearing article having a longitudinal direction and a lateral direction perpendicular to each other, the article including: a skin-facing side and a non-skin-facing side; a front waist region and a rear waist regions; a crotch region extending between the front and rear waist regions in the longitudinal direction; waist members disposed in the front and rear waist regions; a crotch member disposed in the crotch region; a liquid-absorbent structure provided in the crotch member; and waist elastics attached to the waist members and extending in the lateral direction, wherein: the waist members each includes an elastic sheet being elastically stretchable at least in the lateral direction and has an outer end edge and an inner end edge opposed to each other in the longitudinal direction;, the waist elastics each includes first waist elastics disposed on a side of the outer end edge of the corresponding waist member and second waist elastics disposed on a side of the inner end edge of the corresponding waist member; the second
  • the above item (i) may include at least the following embodiments.
  • the waist members each includes a non-elastic sheet which is substantially non-elastically-stretchable at least in the lateral direction; the non-elastic sheets each includes the first waist elastics; and the elastic sheets have the outer end edges respectively secured to the non-elastic sheets at least in the center regions.
  • the elastic sheets overlap with the crotch member; and dimensions of the elastic sheets attached on the crotch member in the lateral direction are respectively longer than dimensions of the regions where the second waist elastics are absent in the lateral direction.
  • a contractile force of the elastic sheet in the lateral direction is smaller than contractile forces of the first waist elastics in the lateral direction.
  • the liquid-absorbent structure includes: a liquid permeable topsheet lying on the skin-facing side; a backsheet lying on the non-skin-facing side; a liquid-absorbent core interposed between the topsheet and the backsheet; and front and rear flaps defined by the topsheet and the backsheet at both end edges in the longitudinal direction, wherein the elastic sheets are respectively disposed on the front waist region and the rear waist region across edges of the front and rear end flaps of the liquid-absorbent structure in the longitudinal direction.
  • the elastic sheet has a greater stretchability in the lateral direction than in the longitudinal direction.
  • the elastic sheets respectively cover a front end and a back end of the crotch member in the longitudinal direction, and each exert a contractile force of 0.05 to 0.50 N when returning to a 50% contracted state from a state where the elastic sheet is stretched to have a dimension in the lateral direction twice as long as in a natural state in which no external force is applied, the 50% contracted state is a state where the elastic sheet has the dimension in the lateral direction 50% longer than in the natural state.
  • the second waist elastics are absent in the regions of the liquid-absorbent structure, thus preventing the liquid-absorbent structure from shrinking in the lateral direction by a contractile force of the front and rear second waist elastics.
  • the elastic sheet includes the inner end edge secured to the crotch member at least in the center region.
  • the elastic sheet When a tensile load is applied between the lateral edges, the elastic sheet is deformed to constrict at least in the center region such that a dimension of the center region in the longitudinal direction becomes smaller than a dimension of each of the lateral edges of in the longitudinal direction.
  • wearing the disposable wearing article constricts the center region of the elastic sheet. This allows the elastic sheet to lift the center region of the crotch member upward, thus preventing the degradation of the close contact capability of the liquid-absorbent structure with the skin.

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Abstract

La présente invention concerne une couche (10) comprenant une zone avant située au niveau de la taille (12) et une zone arrière située au niveau de la taille (13), une zone correspondant à l'entrejambe (14) placée entre les zones avant et arrière situées au niveau de la taille dans le sens longitudinal, des éléments (20, 30) placés dans les zones avant et arrière situées au niveau de la taille, un élément situé au niveau de l'entrejambe (40) disposé dans la zone de l'entrejambe, une structure absorbant les liquides (40A) située au niveau de l'élément situé au niveau de l'entrejambe et des élastiques situés au niveau de la taille (60, 70) et fixés aux éléments situés au niveau de la taille et se prolongeant dans le sens latéral. Les éléments situés au niveau de la taille (20, 30) comprennent respectivement des bords terminaux extérieurs (201, 311) et des bords terminaux intérieurs (202, 312). Les éléments situés au niveau de la taille (20, 30) comprennent également et respectivement des voiles élastiques (55f, 55b). Les élastiques situés au niveau de la taille (60, 70) comprennent respectivement des premiers élastiques situés au niveau de la taille (61, 71) respectivement disposés sur le côté des bords terminaux extérieurs (201, 311) de leurs éléments situés au niveau de la taille (20, 30) respectifs et des seconds élastiques situés au niveau de la taille (62, 72) respectivement situés sur le côté des bords terminaux intérieurs (202, 312) de leurs éléments situés au niveau de la taille (20, 30) respectifs. Les seconds élastiques situés au niveau de la taille (62, 72) sont respectivement absents des zones (79f, 79b) de la structure absorbant les liquides (40A). Chacun des voiles élastiques (55f, 55b) comprend des bords latéraux (55s), ainsi qu'un bord terminal extérieur (559) et un bord terminal intérieur (557). Le bord terminal intérieur (557) est fixé à l'élément situé au niveau de l'entrejambe (40) au moins dans une zone centrale (55c). Lorsqu'un effort de tension (F) est appliqué entre les bords latéraux (55s), chacun des voiles élastiques (55f) et (55b) est déformé afin de se comprimer au moins dans la zone centrale (55c), si bien que la dimension de la zone centrale (55c) dans le sens longitudinal (Y) devient inférieure à la dimension de chacun des bords latéraux (55s) dans le sens longitudinal (Y).
PCT/JP2012/006210 2011-09-30 2012-09-27 Article de protection jetable WO2013046703A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2011-218595 2011-09-30
JP2011218595 2011-09-30
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US20170165128A1 (en) * 2014-08-27 2017-06-15 The Procter & Gamble Company Wearable article having elastic belt
US20170165129A1 (en) * 2014-08-27 2017-06-15 The Procter & Gamble Company Wearable article having elastic belt
US20170165124A1 (en) * 2014-08-27 2017-06-15 The Procter & Gamble Company Wearable article having elastic belt
US20170165126A1 (en) * 2014-08-27 2017-06-15 The Procter & Gamble Company Wearable article having elastic belt
CN108472176A (zh) * 2015-12-28 2018-08-31 尤妮佳股份有限公司 一次性尿布
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JP2016010516A (ja) * 2014-06-27 2016-01-21 ユニ・チャーム株式会社 使い捨て着用物品
WO2015198665A1 (fr) * 2014-06-27 2015-12-30 ユニ・チャーム株式会社 Article a porter
JP2016182168A (ja) * 2015-03-25 2016-10-20 日本製紙クレシア株式会社 パンツ型吸収性物品
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JP2011136082A (ja) * 2009-12-28 2011-07-14 Unicharm Corp 着用物品

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US20170165129A1 (en) * 2014-08-27 2017-06-15 The Procter & Gamble Company Wearable article having elastic belt
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US20170165126A1 (en) * 2014-08-27 2017-06-15 The Procter & Gamble Company Wearable article having elastic belt
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US10624797B2 (en) * 2014-08-27 2020-04-21 The Procter & Gamble Company Wearable article having elastic belt
US20170143560A1 (en) * 2014-08-27 2017-05-25 The Procter & Gamble Company Wearable article having elastic belt
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US10624799B2 (en) * 2014-08-27 2020-04-21 The Procter & Gamble Company Wearable article having elastic belt
US11642254B2 (en) 2014-08-27 2023-05-09 The Procter & Gamble Company Wearable article having elastic belt
CN108472176A (zh) * 2015-12-28 2018-08-31 尤妮佳股份有限公司 一次性尿布
CN108472176B (zh) * 2015-12-28 2021-03-09 尤妮佳股份有限公司 一次性尿布
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KR20180099766A (ko) * 2015-12-28 2018-09-05 유니챰 가부시키가이샤 일회용 기저귀
CN112236111B (zh) * 2018-05-31 2022-06-28 王子控股株式会社 吸收性物品
CN112236111A (zh) * 2018-05-31 2021-01-15 王子控股株式会社 吸收性物品

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JP2013081752A (ja) 2013-05-09
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JP5865778B2 (ja) 2016-02-17

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