JP2013081752A - Disposable wearing article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable wearing article that improves adhesive force of a liquid-absorbent structure to skin by preventing the liquid-absorbent structure from shrinking in a lateral direction.SOLUTION: A diaper includes: a front waist region 12; a rear waist region 13; a crotch region 14; waist members 20, 30 disposed in the front and rear waist regions; a crotch member 40 disposed in the crotch region; a liquid-absorbent structure 40A provided to the crotch member; and waist elastics 60, 70 in the waist members. The waist members include elastic sheets 55f, 55b respectively. Each of the elastic sheets includes sheet both-side edges 55s in a lateral direction X; and a sheet outer end edge and a sheet inner end edge that face each other in a longitudinal direction Y. The sheet inner end edge is fixed to the crotch member in a center region. When a tensile load F is applied between the sheet both-side edges, the center region is deformed to form a constriction such that the dimension of the center region in the longitudinal direction Y becomes smaller than the dimension of each of the sheet both-side edges in the longitudinal direction Y.

Description

  The present invention relates to a disposable wearing article, and more particularly, to a disposable wearing article such as a disposable diaper, a disposable training pant, a disposable incontinence pant, and a disposable sanitary pant.

  Conventionally, the front waist region and the rear waist region which have a longitudinal direction and a lateral direction orthogonal to each other, a skin facing surface and a non-skin facing surface, and face each other on the skin facing surface, and the front waist region in the longitudinal direction And a crotch region disposed between the rear waist region, a front waist elastic body extending in the lateral direction in the front waist region and having elasticity, and a rear body extending in the lateral direction in the rear waist region and having elasticity. Disposable wearing articles comprising a waist elastic body and a liquid-absorbing structure that absorbs body fluid provided in the crotch region are known.

  For example, Patent Document 1 discloses a disposable diaper that is disposed in a state where a rear waist elastic body is cut at a portion where the rear waist elastic body overlaps the liquid absorbing structure.

  According to this disposable diaper, the liquid absorbing structure can be prevented from contracting in the lateral direction due to the contraction force of the rear waist elastic body.

Japanese Patent No. 4421012

  Since the disposable diaper currently disclosed by patent document 1 is arranged in the state where a part of the back waist elastic body was cut, the adhesion power to the skin of a liquid absorption structure falls, and the state which wore a diaper There was a problem that the liquid absorbing structure was separated from the skin.

  In view of this, an object of the present invention is to provide a disposable wearing article capable of preventing the liquid absorbing structure from contracting in the lateral direction and improving the adhesion of the liquid absorbing structure to the skin.

  In order to solve the above problems, the present invention has a lateral direction and a longitudinal direction orthogonal to each other, a skin facing surface and a non-skin facing surface, and a front waist region and a rear waist region facing each other on the skin facing surface. A crotch region located between the front waist region and the rear waist region in the longitudinal direction; a waist member disposed in the front waist region and the rear waist region; and a crotch member disposed in the crotch region. And a disposable wear article comprising a liquid-absorbing structure provided in the crotch member and a waist elastic body extending in the lateral direction in the waist member.

  In this disposable wearing article, the feature of the present invention is that the waist member has an outer end edge and an inner end edge facing in the longitudinal direction, and includes an elastic sheet that is stretchable at least in the lateral direction. The waist elastic body includes a first waist elastic body arranged on the outer end edge side of the waist member, and a second waist elastic body arranged on the inner end edge side of the waist member, The second waist elastic body does not exist in the region of the liquid-absorbing structure, and the elastic sheet includes both lateral edge portions of the lateral direction, an outer edge portion of the sheet facing the longitudinal direction, and A sheet inner edge, and the sheet inner edge is fixed to the crotch member in the at least central region, and when a tensile force is applied between the sheet both edges, the sheet both edges In the vertical Than the dimension of the direction, at least the central region in a manner that the longitudinal dimension of the central region is reduced is to deform as constricted.

  According to the disposable wearing article according to the present invention, since the second waist elastic body does not exist in the region of the liquid absorbent structure, the liquid absorbent structure is laterally moved by the contraction force of the front and rear second waist elastic bodies. Can be prevented from shrinking.

  In addition, the elastic sheet has a sheet inner edge fixed to the crotch member at least in the central region, and when a tensile force is applied between the sheet side edges, the longitudinal dimension at the sheet side edges It is deformed so that at least the central region is constricted in such a manner that the vertical dimension in the central region is reduced. Therefore, since the elastic sheet is constricted in the central region by wearing the disposable wearing article, the central region of the crotch member can be lifted upward by the elastic sheet, and the adhesion of the liquid absorbent structure to the skin is reduced. This can be prevented.

The perspective view of the disposable diaper as an example of the disposable wearing article which concerns on this invention. A partially broken development view of a diaper. The figure similar to FIG. 2 which fractured | ruptured a part of crotch member. The IV-IV line expanded sectional view of FIG. It is explanatory drawing which shows an elastic sheet, Comprising: (a) is explanatory drawing which shows the state in which the tensile force is not applied, (b) is explanatory drawing which shows the state in which the tensile force which mutually spaces apart is applied Figure. Explanatory drawing which shows a deformation | transformation of the back waist member of a diaper. The figure similar to FIG. 3 which shows the modification of a diaper. (A) The top view of an example of an elastic sheet. (B) VIIIb-VIIIb sectional view taken on the line of FIG. Sectional drawing of another example of an elastic sheet. The figure which showed the relationship between the expansion | extension to the horizontal direction X, and contraction force when the elastic sheet was extended to the horizontal direction X. FIG. The figure which showed the relationship between the expansion | extension to the horizontal direction X, and contraction force in the case of extending | stretching the sample nonwoven fabric to the horizontal direction X. FIG. The side view which shows the detection part of the apparatus which measures the hardness of an elastic sheet and a sample nonwoven fabric.

  FIG. 1 is a perspective view of a disposable diaper 10 which is a disposable wearing article according to the present invention. In FIG. 1, X indicates a horizontal direction, and Y indicates a vertical direction orthogonal to the horizontal direction X. The diaper 10 has a skin facing surface for the wearer and a non-skin facing surface that is the opposite surface.

  The diaper 10 includes an annular waist member 11 that extends in the direction around the waist of the wearer, and a crotch member 40 that is connected to the waist member 11 and extends in the longitudinal direction Y. The waist member 11 is formed by connecting the front waist member 20 and the rear waist member 30 in an annular shape.

The diaper 10 has a waistline opening 15 formed by a front outer end edge portion 201 described later of the front waist member 20 and a waistline outer end edge portion 311 of the rear waist member 30, and both side edge portions 40 s of the crotch member 40 described later. And a pair of leg openings 16 formed by the front inner end edge 202 of the front waist member 20 or the waist inner end edge 312 of the rear waist member 30.

  FIG. 2 is a developed view in which a part of the diaper 10 is broken, and FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. In FIG. 2, P indicates a virtual vertical center line that bisects the length dimension in the horizontal direction X when the diaper 10 is expanded, and Q indicates the length dimension in the vertical direction Y when the diaper 10 is expanded. Is a virtual horizontal center line that bisects. The diaper 10 is symmetric with respect to the virtual vertical center line P. In FIG. 4, Z indicates a thickness direction orthogonal to the vertical direction Y and the horizontal direction X, respectively.

  The diaper 10 has the front waist region 12 and the back waist region 13 which mutually oppose in a skin opposing surface in the wearing condition shown in FIG. A front waist member 20 is disposed in the front waist region 12, and a rear waist member 30 is disposed in the rear waist region 13.

  The diaper 10 has a crotch region 14 located between the front waist region 12 and the rear waist region 13 in the longitudinal direction Y. A crotch member 40 is disposed in the crotch region 14.

  The front waist member 20 has a front outer end edge portion 201 extending in the horizontal direction X on the side away from the virtual horizontal center line Q, and a front inner end edge portion 202 extending in the horizontal direction X on the side close to the virtual horizontal center line Q. The front outer edge 201 and the front inner edge 202 are connected to each other and a front side edge 203 extending in the longitudinal direction Y is defined in a rectangular shape.

  The rear waist member 30 is formed of a waistline cover portion 31 that has a rectangular shape whose dimension in the horizontal direction X is larger than that in the vertical direction Y, and a buttock cover portion 32 that is continuous with the waistline cover portion 31.

  The waistline cover portion 31 is formed in the same shape and size as the front waist member 20. That is, the waistline cover portion 31 includes a waistline outer end edge 311 extending in the lateral direction X on the side away from the virtual lateral centerline Q, and a waistline inner end edge extending in the lateral direction X on the side close to the virtual lateral centerline Q. A portion 312 is defined in a rectangular shape from a waistline outer edge 311 and a waistline inner edge 312, and a waistline side edge 313 extending in the longitudinal direction Y.

  The buttock cover portion 32 is formed in a substantially trapezoidal shape extending from the waistline inner end edge 312 of the waistline cover portion 31 toward the virtual lateral center line Q. That is, the buttock cover portion 32 includes a buttock outer end edge portion 321 that coincides with the waistline inner end edge portion 312, a buttock inner end edge portion 322 that extends in the lateral direction X, a buttock outer end edge portion 321, and a buttock inner end edge portion. It is defined in a substantially trapezoidal shape from both side edge portions 323 of the buttock portion extending by inclining in the longitudinal direction Y by connecting 322. The buttocks cover portion 32 covers the buttocks of the wearer wearing the diaper 10.

  The front side edge portions 203 of the front waist member 20 and the waist side side edge portions 313 of the front waist member 30 that face each other on the skin facing surface overlap each other and are welded portions 17 that are intermittently arranged in the longitudinal direction Y. It is joined.

  The front waist member 20 and the rear waist member 30 include an inelastic sheet 50 that is substantially non-stretchable in the lateral direction X and the longitudinal direction Y, and an elastic sheet 55 that is stretchable in the lateral direction X and the longitudinal direction Y. In the diaper 10 described in this example, two inelastic sheets 50 are used. Regarding the two inelastic sheets 50, in the portions 56 facing each other in the thickness direction Z, the first inelastic sheet 51 is located on the skin facing surface side, and the one located on the non skin facing surface side is the first. 2 is an inelastic sheet 52.

  The first inelastic sheet 51 f forming the front waist member 20 has an elongated rectangle having a dimension in the horizontal direction X larger than a dimension in the vertical direction Y.

  The first inelastic sheet 51b that forms the rear waist member 30 includes the entire region of the buttock cover portion 32, and a part of the waistline cover portion 31, specifically, the waistline of the waistline cover portion 31 adjacent to the buttock cover portion 32. A portion extending from the inner end edge 312 to the side away from the virtual lateral center line Q is included.

  The second non-elastic sheet 52f forming the front waist member 20 has a long and narrow rectangle whose dimension in the horizontal direction X is longer than that in the vertical direction Y.

  The second inelastic sheet 52 b forming the rear waist member 30 has the entire area of the buttock cover portion 32 and the entire area of the waistline cover portion 31.

  The second inelastic sheets 52b and 52f are a main body 53 extending in the longitudinal direction Y so as to be separated from the virtual lateral center line Q from a portion 56 facing the skin facing surface side of the first inelastic sheet 51. And a bent portion 54 from the outer end edge portions 201 and 311 of the main body portion 53 to the skin facing surface side.

  The main body portion 53 covers the entire area of the front and rear waist members 20 and 30 on the non-skin facing surface side, and the bent portion 54 is a part of the skin facing surface of the main body portion 53 (skin facing on the outer edge portions 201 and 311 side). Cover the surface).

  In the front waist region 12, the elastic sheet 55f covers the skin facing surface of the sheet outer edge 519f of the first inelastic sheet 51f. A front end flap 47f, which will be described later, of the crotch member 40 covers the skin facing surface of the sheet outer edge 559f of the elastic sheet 55f. The folded portion 54 of the second inelastic sheet 52 covers the skin facing surface of the front edge 40f of the crotch member 40.

  In the rear waist region 13, a later-described rear end flap 47b of the crotch member 40 covers the skin facing surface of the outer edge portion 519b of the first inelastic sheet 51b. The elastic sheet 55b covers the skin facing surface of the rear edge 40b of the crotch member 40. The bent portion 54 of the second inelastic sheet 52 covers the outer edge 559b of the elastic sheet 55b.

The first inelastic sheets 51b and 51f and the second inelastic sheets 52b and 52f are substantially non-stretchable SMS (spunbond / meltblown / spunbond) fiber nonwoven fabrics and spans each having a mass of about 15 to 30 g / m ^2. A bond fiber nonwoven fabric or an air-through fiber nonwoven fabric, a plastic sheet, or a laminate sheet thereof can be used. These sheets 51b, 51f, 52b, and 52f are joined by joining means such as a hot melt adhesive applied to the inner surface of at least one of the sheets 51b, 51f, 52b, and 52f.

  The elastic sheet 55 includes an elastic sheet 55 f disposed in the front waist region 12 and an elastic sheet 55 b disposed in the rear waist region 13. These elastic sheets 55b and 55f have an elongated rectangle having a dimension in the horizontal direction X longer than a dimension in the vertical direction Y.

  Elastic sheet nonwoven fabric is used for the elastic sheets 55b and 55f. As the stretchable fiber nonwoven fabric, for example, known fiber nonwoven fabrics such as spunbond fiber nonwoven fabric, melt blown fiber nonwoven fabric, heat roll fiber nonwoven fabric, SMS fiber nonwoven fabric, airlaid fiber nonwoven fabric and air-through fiber nonwoven fabric are used alone or in combination. be able to. Stretch fiber nonwoven fabrics are, for example, elastomer resins made of polystyrene, polyurethane, etc., thermoplastic resins made of polyethylene, polypropylene, polyester, acrylic, etc., cores made of polyethylene / polypropylene, polyethylene / polyethylene terephthalate, polypropylene / polyethylene terephthalate. It is formed from a sheath-type or side-by-side type composite fiber. In addition, it is preferable to use the elastic sheets 55f and 55b having a larger elongation rate in the horizontal direction X than the elongation rate in the vertical direction Y.

  The elastic sheet 55f located in the front waist region 12 extends in the lateral direction X on the side close to the virtual lateral center line Q and the seat outer edge 559f extending in the lateral direction X on the side away from the virtual lateral center line Q. The sheet is defined in a rectangular shape from an inner edge portion 557f of the sheet, and an outer edge edge portion 559f of the sheet and a both-side edge portion 55s of the sheet extending in the longitudinal direction Y by connecting the inner edge portion 557f of the sheet. The sheet outer edge portion 559f and the sheet inner edge portion 557f face each other in the vertical direction Y.

  The elastic sheet 55b located in the rear waist region 13 extends in the lateral direction X on the side close to the virtual lateral center line Q and the sheet outer end edge portion 559b extending in the lateral direction X on the side away from the virtual lateral center line Q. The sheet is defined in a rectangular shape from the sheet inner end edge portion 557b and the sheet both side edge portions 55s extending in the longitudinal direction Y by connecting the sheet outer end edge portion 559b and the sheet inner end edge portion 557b. The sheet outer edge 559b and the sheet inner edge 557b are opposed to each other in the vertical direction Y.

  An example of the elastic sheet 55 is formed so that the urethane fiber 551 and the polyolefin fiber 552 are mixed as shown in FIGS. 8A and 8B, for example. 8A and the reference photograph are taken of the same subject. In these photographs and drawings, the urethane fiber 551 is dyed red, and the urethane fiber 551 and the polyolefin fiber 552 are 50. It has doubled. The urethane fiber 551 has elasticity in the vertical direction Y and the horizontal direction X, and is mainly located in the center in the thickness direction Z. The polyolefin fiber 552 is for maintaining strength and improving the texture, and is mainly located on the front surface side and the back surface side in the thickness direction Z. As shown in the figure, when the elastic sheet 55 is viewed from the front surface side or the back surface side, the urethane fibers 551 appear on the front surface side and the back surface side, and the polyolefin fibers 552 are formed between the urethane fibers 551 on the front surface side and the back surface side. Appearing, polyolefin fiber 552 and urethane fiber 551 are mixed.

The elastic sheet 55 shown in FIGS. 8A and 8B preferably has a mass of about 25 to 60 g / m ² , more preferably 26 to 34 g / m ² , and the fibers 551 and 552 constituting the elastic sheet 55 The diameter is preferably about 20 to 25 μm, and the thickness of the fibers 551 and 552 is about 2.5 to 5.0 dtex.

  As another example of the elastic sheet 55, for example, as shown in FIG. 9, a nonwoven fabric 553 formed of sheet-like urethane fibers and a nonwoven fabric 554 formed of two sheet-like polyolefin fibers are laminated in the thickness direction. It is formed as follows. More specifically, the elastic sheet 55 is formed by laminating the nonwoven fabric 553 between two nonwoven fabrics 554. The nonwoven fabric 553 and the nonwoven fabric 554 are joined by, for example, hot embossing.

  In the front waist region 12, the non-elastic sheets 51f and 52f and the elastic sheet 55f are, for example, the non-elastic sheets 51f and 52f in which no force is applied to the elastic sheet 55f in which no force is applied. It is joined via an adhesive. In addition, as will be described later, a tensile force is applied between the sheet side edge portions 55s, and the central region 55c is smaller in the longitudinal direction Y dimension in the central region 55c than in the longitudinal direction Y dimension at the sheet both side edge portions 55s. The non-elastic sheets 51f and 52f to which no force is applied may be joined to the elastic sheet 55f in a deformed state so as to be constricted via a hot melt adhesive (not shown).

  In the rear waist region 13, the non-elastic sheet 52 b and the elastic sheet 55 b are, for example, an elastic sheet 55 b to which no force is applied and a non-elastic sheet 52 b to which no force is applied via a hot melt adhesive (not shown). Are joined together. In addition, as will be described later, a tensile force is applied between the sheet side edge portions 55s, and the central region 55c is smaller in the longitudinal direction Y dimension in the central region 55c than in the longitudinal direction Y dimension at the sheet both side edge portions 55s. The non-elastic sheet 52b to which no force is applied may be joined to the elastic sheet 55b in a deformed state so as to be constricted via a hot melt adhesive (not shown).

  The joining of the elastic sheet 55f and the non-elastic sheets 51f and 52f and the joining of the elastic sheet 55b and the non-elastic sheet 52b are not limited to hot melt adhesives, and may be joined by sonic sealing, heat sealing, or the like. .

  As shown in FIG. 5A, the elastic sheet 55 has a rectangular shape in a natural state where no force is applied. At this time, the dimension in the horizontal direction X is W0, and the dimension in the vertical direction Y is L0.

  On the other hand, as shown in FIG. 5B, the lateral direction X (the length direction of the elastic sheet 55) so as to be opposed to and separated from the virtual longitudinal center line P between both side edges 55 s of the elastic sheet 55 in the lateral direction X. When the tensile force F is applied to the central region 55c, the central region 55c is smaller in the longitudinal direction Y dimension L2 in at least the central region 55c where the virtual longitudinal center line P is located than in the longitudinal direction Y dimension L1 at the side edges 55s. Deforms so that necking occurs. Further, the dimension L1 in the longitudinal direction Y when the tensile force F is applied between the side edge portions 55s is slightly smaller than the dimension L0 in the longitudinal direction Y in the natural state.

  An example of the elastic sheet 55 used for this diaper 10 is shown below. The elastic sheet 55 has a dimension W0 in the horizontal direction X in a natural state of 150 mm or more and a dimension L0 in the vertical direction Y of 80 mm. The elastic sheet 55 is formed so that the urethane fiber 551 and the polyolefin fiber 552 are mixed as shown in FIG.

  When measuring the deformation of the elastic sheet 55, both side edge portions 55s of the elastic sheet 55 are respectively attached to a pair of chucks (not shown) of a tensile tester (manufactured by Shimadzu Corporation AG-I) (between the pair of chucks). The distance in the initial state is 150 mm), and by moving one of the chucks, the pair of chucks are gradually moved away from each other.

  When the distance between the pair of chucks is 200 mm, the dimension L2 in the longitudinal direction Y in the central region 55c is 68 mm. Therefore, the dimension in the longitudinal direction Y of the constriction is 12 mm. The distance between the chucks is assumed on the assumption that the elastic sheet 55 is applied to a diaper 10 having a lateral X dimension of the front waist member 20 and the rear waist member 20 of 400 mm.

  When the distance between the chucks becomes 250 mm, the dimension L2 in the longitudinal direction Y in the central region 55c is 55 mm. Therefore, the dimension in the longitudinal direction Y of the constriction is 25 mm. The distance between the chucks is assumed on the assumption that the elastic sheet 55 is applied to the diaper 10 in which the horizontal direction X of the front waist member 20 and the rear waist member 20 is 500 mm.

  When the distance between the chucks becomes 300 mm, the dimension L2 in the longitudinal direction Y in the central region 55c is 47 mm. Therefore, the dimension in the longitudinal direction Y of the constriction is 33 mm. The distance between the chucks is assumed on the assumption that the elastic sheet 55 is applied to the diaper 10 in which the horizontal direction X of the front waist member 20 and the rear waist member 20 is 600 mm.

  When the distance between the chucks becomes 325 mm, the dimension L2 in the longitudinal direction Y in the central region 55c is 42 mm. Therefore, the dimension in the longitudinal direction Y of the constriction is 38 mm. The distance between the chucks described above is assumed assuming that the elastic sheet 55 is applied to the diaper 10 having a lateral X dimension of the front waist member 20 and the rear waist member 20 of 650 mm.

  The elastic sheet 55 has a dimension W0 in the horizontal direction X of 150 mm in a natural state, and when a tensile force is applied so that the dimension W1 in the horizontal direction X is 325 mm, in other words, When a tensile force is applied so that the dimension W1 in the direction X is 2.17 times, the dimension in the longitudinal direction Y in the central area 55c is changed from 80 mm to 42 mm, and the dimension in the longitudinal direction Y with respect to the central area 55c in the natural state is 47. .5% decrease.

  The first inelastic sheet 51 and the second inelastic sheet 52 are joined with a hot melt adhesive applied to at least one of the sheets 51 and 52 in the entire region 56 facing each other.

  In the front waist region 12, the elastic sheet 55f is attached to the main body 53 of the second non-elastic sheet 52f by a fixing means (not shown) such as a hot melt adhesive. In other words, the elastic sheet 55f has the sheet outer end edge portion 559f attached to the second inelastic sheet 52f by fixing means at least in the central region 55c.

  In the rear waist region 13, the elastic sheet 55 b is attached to the main body portion 53 and the bent portion 54 of the second inelastic sheet 52 b with fixing means (not shown) such as a hot melt adhesive. It is. In other words, the elastic sheet 55b has the sheet outer end edge portion 559b attached to the second inelastic sheet 52b by the fixing means at least in the central region 55c.

  In the front waist region 12, the elastic sheet 55 f is fixed to the non-skin facing surface of the crotch member 40 by a fixing means 801 such as a hot melt adhesive as shown by the wavy line in FIG. 3. It is attached. In other words, the elastic sheet 55f has at least the sheet inner edge 557f fixed to the crotch member 40 by the fixing means 801. Further, a joining region 80f between the elastic sheet 55f and the crotch member 40 is formed by the fixing means 801.

  In the rear waist region 13, the elastic sheet 55 b overlaps with the crotch member 40 as shown by a wavy line in FIG. 3, and the side of the sheet inner edge 557 b faces the skin facing surface of the crotch member 40. It is attached by fixing means 802 such as a hot melt adhesive. In other words, the elastic sheet 55b has at least the sheet inner edge 557b fixed to the crotch member 40 by the fixing means 802. Further, a joining region 80b between the elastic sheet 55b and the crotch member 40 is formed by the fixing means 802.

  As shown in FIG. 3, the crotch member 40 has a rectangular shape having a size in the vertical direction Y larger than the size in the horizontal direction X, a front end edge 40 f extending in the horizontal direction X, and a rear end edge 40 b extending in the horizontal direction X. And both side edge portions 40s extending in the longitudinal direction Y connecting the front end edge 40f and the rear end edge 40b.

  The crotch member 40 is provided with a liquid absorbing structure 40A. As shown in FIGS. 3 and 4, the liquid-absorbent structure 40 </ b> A includes a top sheet 41 positioned on the skin facing surface side, a back sheet 42 positioned on the non-skin facing surface side, and the top sheet 41 and the back sheet 42. And a core material 43 that absorbs the body fluid interposed between them.

  The surface sheet 41 covers the entire skin facing surface of the core material 43, and a liquid-permeable fiber nonwoven fabric can be used.

  The back sheet 42 covers the entire area of the non-skin side surface of the core material 43, and a liquid non-permeable or liquid impermeable fiber nonwoven fabric or film can be used.

For the topsheet 41 and the backsheet 42, for example, a spunbond fiber nonwoven fabric, a spunbond meltblown spunbond (SMS) fiber nonwoven fabric, an air-through fiber nonwoven fabric, a point bond fiber nonwoven fabric, or the like can be used.

  The top sheet 41 and the back sheet 42 extend from both end edges 43f and 43b of the core member 43 in the longitudinal direction Y, and the extension portions are overlapped with each other and joined together with a hot melt adhesive. 43, front and rear end flaps 47f and 47b extending from both side edges 43s of the frame 43 are formed.

  The top sheet 41 and the back sheet 42 extend in the lateral direction X from both side edges 43 s of the core material 43, and the extended portions are overlapped with each other and joined with a hot melt adhesive, thereby forming the core material 43. Side flaps 47s extending from both side edges 43s are formed.

  The core material 43 has a rectangular shape whose dimension in the longitudinal direction Y is larger than the dimension in the transverse direction X, and is formed so as to extend in the longitudinal direction Y in the crotch region 14, for example, absorbent polymer particles 48 and absorbent fibers. 49. The absorbent polymer particles 48 include, for example, starch-based, acrylic acid-based, amino acid-based particles or fibers, and a water-insoluble and water-swellable polymer having an absorption capacity of at least several tens of times the self-mass. Can be used.

  As the absorbent fiber 49, natural pulp fiber such as wood fluff pulp, regenerated fiber such as rayon staple, and a mixture thereof can be used.

  A plurality of leg elastic bodies 44 are disposed between the top sheet 41 and the back sheet 42 at both side edges 40 s of the crotch member 40. The leg elastic body 44 has a string shape or a strand shape, and is arranged so as to extend in the longitudinal direction Y in an extended state. A hot melt adhesive (not shown) is attached to at least one of the top sheet 41 and the back sheet 42. It is attached.

  The crotch member 40 is provided with a pair of leak-proof sheets 45 so as to be symmetric with respect to the virtual vertical center line P. The pair of leak-proof sheets 45 are folded back on the sides close to the virtual vertical center line P, and form a pair of sleeves 45 a extending in the vertical direction Y. Inside the sleeve 45a, a plurality of string-like or strand-like cuff elastic bodies 46 are attached in an expanded state. Each cuff elastic body 46 extends in the longitudinal direction Y, and is fixed to at least one of the leakage preventing sheet 45 on the skin facing surface side and the leakage preventing sheet 45 on the non-skin facing surface side with a hot melt adhesive (not shown). .

  Of the front and rear end flaps 47f and 47b of the crotch member 40, the front end flap 47f located in the front waist region 12 has an elastic sheet 55f and a second inelastic sheet 52 in the thickness direction Z as shown in FIG. Between the bent portion 54 and the bent portion 54. The front end flap 47f has its skin facing surface joined to the bent portion 54 of the second inelastic sheet 52f with a hot melt adhesive, and its non skin facing surface is joined to the elastic sheet 55f with a hot melt adhesive. It is.

  The rear end flap 47b located in the rear waist region 13 is inserted between the elastic sheet 55b and the main body portion 53 of the second inelastic sheet 52b in the thickness direction Z. The rear end flap 47b has its skin facing surface joined to the elastic sheet 55b with a hot melt adhesive, and its non-skin facing surface joined to the main body 53 of the second non-elastic sheet 52b with a hot melt adhesive. It is.

  As shown in FIG. 3, a string-like or strand-like front waist elastic body 60 extending in the transverse direction X is attached to the front waist member 20 in an extended state.

  The front waist elastic body 60 includes a front first waist elastic body 61 located on the outer end edge portion 201 side and a front second waist elastic body 62 located on the inner end edge portion 202 side.

  The front first waist elastic body 61 is attached in an extended state between the main body portion 53 and the bent portion 54 of the second inelastic sheet 52f, and hot melt applied to at least one of the main body portion 53 and the bent portion 54. It is fixed with an adhesive.

  The length dimension in the lateral direction X of the second inelastic sheet 52f is larger than the length dimension in the lateral direction X of the elastic sheet 55f, but the lateral direction of the elastic sheet 55f is caused by the contraction force of the front first waist elastic body 61. It is substantially the same as the length dimension of X.

  The front second waist elastic body 62 is attached in an expanded state between the first inelastic sheet 51f and the main body 53 of the second inelastic sheet 52f, and is applied to at least one of these sheets 51f and 52f. Fixed with hot melt adhesive.

  The length dimension in the lateral direction X of the first inelastic sheet 51f is larger than the length dimension in the lateral direction X of the elastic sheet 55f, but the lateral direction of the elastic sheet 55f is caused by the contraction force of the front second waist elastic body 62. It is substantially the same as the length dimension of X.

  The front waist elastic body 60 has a thickness of about 470 to 780 dtex, and can be used at an expansion ratio of about 2.5 to 3.0 times.

  A string-shaped or strand-shaped rear waist elastic body 70 extending in the lateral direction X is attached to the waistline cover portion 31 of the rear waist member 30 in an expanded state.

  The rear waist elastic body 70 includes a rear first waist elastic body 71 located on the outer end edge portion 311 side and a rear second waist elastic body 72 located on the inner end edge portion 312 side.

  The rear first waist elastic body 71 is attached in an extended state between the main body portion 53 and the bent portion 54 of the second inelastic sheet 52b, and is applied to at least one of the main body portion 53 and the bent portion 54. It is fixed with an adhesive.

  The length dimension in the lateral direction X of the second inelastic sheet 52b is larger than the length dimension in the lateral direction X of the elastic sheet 55b, but the lateral direction of the elastic sheet 55b is caused by the contraction force of the rear first waist elastic body 71. It is substantially the same as the length dimension of X.

  The rear second waist elastic body 72 is attached in an extended state between the first inelastic sheet 51b and the main body portion 53 of the second inelastic sheet 52b, and applied to at least one of these sheets 51b and 52b. Fixed with hot melt adhesive.

  The length dimension in the lateral direction X of the first inelastic sheet 51b is larger than the length dimension in the lateral direction X of the elastic sheet 55b, but the lateral direction of the elastic sheet 55b is caused by the contraction force of the rear second waist elastic body 72. It is substantially the same as the length dimension of X.

  The rear waist elastic body 70 has a thickness of about 470 to 780 dtex and can be used at an expansion ratio of about 2.5 to 3.0 times.

  A string-like or strand-like collar cover elastic body 73 extending in the lateral direction X is also attached to the collar cover portion 32 in an extended state.

  The collar cover elastic body 73 has a thickness of about 470 to 780 dtex and can be used at an expansion ratio of about 1.5 to 2.5 times.

  The second waist elastic bodies 62 and 72 and the buttocks cover elastic body 73 are not present in the non-existing areas 79f and 79b of the elastic body 73 shown in FIG. The non-existing regions 79f and 79b are provided by cutting the regions 79f and 79b overlapping the core member 43 in FIG.

  In the front waist region 12, the dimension in the lateral direction X of the non-existing region 79f is smaller than the dimension in the lateral direction X of the joining region 80f.

  In the rear waist region 13, the dimension in the lateral direction X of the non-existing region 79b is smaller than the dimension in the lateral direction X of the joining region 80b.

  According to the diaper 10 according to the present invention, the second waist elastic bodies 62 and 72 do not exist in the regions 79f and 79b of the liquid-absorbing structure 40A. Thus, the liquid absorbing structure 40A can be prevented from contracting in the lateral direction X.

  In addition, the elastic sheet 55 has the sheet inner edge portions 557f and 557b fixed to the crotch member 40 at least in the central region 55c, and when the tensile force F is applied between the sheet both side edge portions 55s, It is deformed so that at least the central region 55c is constricted in such a manner that the vertical dimension Y2 in the central region 55c is smaller than the vertical dimension Y in 55s. Therefore, since the elastic sheets 55f and 55b are constricted in the central region 55c by wearing the diaper 10, the central region of the crotch member 40 can be lifted upward by the elastic sheets 55f and 55b, and the liquid absorbing structure 40A It can prevent that the adhesive force to skin falls.

  In addition, since the first waist elastic bodies 61 and 71 are attached to the second inelastic sheets 52f and 52b, the first waist elastic bodies 61 and 71 improve the rigidity of the second inelastic sheets 52f and 52b. Can do. Further, since the central area of the crotch member 40 can be lifted upward by the contraction force of the elastic sheets 55f and 55b, it is possible to reliably prevent the adhesion of the liquid absorbent structure 40A to the skin from being lowered. .

  Further, in the lateral direction X, the elastic sheets 55f and 55b overlap the crotch member 40, and the dimensions in the lateral direction X of the elastic sheets 55f and 55b fixed to the crotch member 40 are the same as those of the second waist elastic bodies 62 and 72. Since it is larger than the dimension in the lateral direction X of the existing regions 79f and 79b, the crotch member 40 can be pressed against the skin by the contraction force of the elastic sheets 55f and 55b even in the non-existing regions 79f and 79b.

  The waist members 20 and 30 include substantially non-stretchable non-elastic sheets 52f and 52b at least in the lateral direction X, and the first waist elastic bodies 61 and 71 are disposed on the non-elastic sheets 52f and 52b. Therefore, the presence of the first waist elastic bodies 61 and 71 can improve the rigidity of the non-elastic sheets 52f and 52b. Moreover, since at least the central area 55c of the outer edge 559 of the elastic sheet 55f, 55b is fixed to the non-elastic sheet 52f, 52b, when the elastic sheets 55f, 55b are deformed, the crotch member 40 is further improved. The central area can be lifted away from the virtual lateral center line Q.

  In addition, since the elastic sheets 55f and 55b formed of the stretchable fiber nonwoven fabric are disposed on the front and rear waist members 20 and 30, even if the extension force of the front and rear waist elastic bodies 60 and 70 is set to be relatively small, Desirable fit can be imparted in the front and rear waist regions 13 and 14. Therefore, it is possible to reduce the risk that the local compression marks are attached to the skin by the front and rear waist elastic bodies 60 and 70 formed of a string-like or strand-like elastic material.

  In the so-called three-piece type diaper formed by the front waist member, the rear waist member, and the crotch member, if only the crotch member 40 extends in the longitudinal direction Y in the crotch region 14, excrement such as urine is excreted. The crotch member 40 is easily separated from the skin when the diaper 10 is used, but according to the diaper 10, the crotch member 40 is separated from the skin even when excrement is excreted by utilizing the deformation of the elastic sheets 55f and 55b. Can be suppressed.

Further, an experiment was performed in which the elastic sheet 55 was stretched by applying the following force and the contraction force in the stretched state was measured. In this experiment, in a natural state where no force is applied, the elastic sheet 55 having a longitudinal direction Y dimension of 50 mm and a transverse direction X dimension of 100 mm is pulled in the transverse direction X to pull it in the transverse direction X. After extending so that the dimension is 200 mm (in other words, the dimension in the lateral direction X is twice as long), the dimension in the lateral direction X is 100 mm by gradually removing the force. Return. The result of the experiment in which this cycle was repeated is shown in the upper column of Table 1 and FIG. In FIG. 10, the solid line indicates the first cycle, and the broken line indicates the second cycle. Moreover, the numerical value in Table 1 is the magnitude | size of the contraction force (unit N) of the elastic sheet whose length of the horizontal direction X of a natural state is 50 mm in each condition. Further, as shown in FIG. 8, the elastic sheet 55 is formed so that the urethane fiber 551 and the polyolefin fiber 552 are mixed, the content of the urethane fiber 551 is 47%, and the thickness direction is The length is 0.98 mm and the mass is 32.58 g / m ² .

  In this experiment, when the elastic sheet 55 having a dimension of 100 mm in the horizontal direction X is stretched in the horizontal direction X, the contraction force applied in the horizontal direction X is when wearing the diaper 10 or when wearing the diaper 10. This corresponds to the force required to enlarge the waistline opening 15. On the other hand, after the elastic sheet 55 is stretched twice in the lateral direction X, the contraction force in the lateral direction X in a state where the force is gradually removed is the body of the wearer when the diaper 10 is worn. It corresponds to the force applied to.

In addition, a nonwoven fabric is prepared in which the dimension in the longitudinal direction Y and the dimension in the lateral direction X are the same as those of the elastic sheet 55 in a state where no force is applied. In this second nonwoven fabric, in the second cycle, from the state in which no force is applied, the contraction force that is almost the same as the contraction force generated in the elastic sheet 55 in a state in which a force that is doubled in the lateral direction X is applied. A sample nonwoven fabric prepared by attaching thread rubber extending in the transverse direction X at equal intervals in the longitudinal direction Y so as to generate force is prepared, and the results of the experiment in which the same cycle as described above is repeated are shown in the lower column of Table 1 and As shown in FIG. The rubber thread is a polyurethane elastic fiber formed by a dry spinning method. In the sample nonwoven fabric, 11 urethane elastic fibers each having a thickness of 470 dtex are arranged at intervals of 4 mm. The sample nonwoven fabric has a length in the thickness direction Z of about 2.5 mm and a mass of about 70 g / m ² . Note that the solid line in FIG. 11 represents the first cycle, and the broken line represents the second cycle.

  In Table 1, “1st” indicates the first cycle, and “2nd” indicates the second cycle. Further, “going” means that the elastic sheet 55 to which no force is applied is contracted in the horizontal direction X while being stretched so that the dimension in the horizontal direction X becomes 200 mm by pulling in the horizontal direction X. Showing power. Furthermore, “return” is in the middle of returning the dimension in the lateral direction X to 100 mm by gradually removing the force applied to the elastic sheet 55 stretched so that the dimension in the lateral direction X becomes 200 mm. The contraction force applied in the lateral direction X is shown. Further, “%” indicates the ratio of the length dimension in the lateral direction X in which the elastic sheet 55 and the sample nonwoven fabric are stretched when the contraction force is measured based on the state where the dimension in the lateral direction X is 100 mm. Therefore,% in Table 1 corresponds to the elongation mm on the horizontal axis in FIGS.

  As shown in Table 1, in the second cycle, in the state where the elastic sheet 55 that has been doubled in the lateral direction X is contracted to 75%, the contraction force of the elastic sheet 55 is 1.01 N. The shrinkage force of the sample nonwoven fabric is 1.71N. In other words, the shrinkage force of the sample nonwoven fabric is about 1.7 times the shrinkage force of the elastic sheet 55.

  In the second cycle, in the state where the elastic sheet 55 that has been doubled in the lateral direction X is contracted to 50%, the contraction force of the elastic sheet 55 is 0.47 N, whereas The contraction force is 1.22N. In other words, the shrinkage force of the sample nonwoven fabric is about 2.6 times the shrinkage force of the elastic sheet 55.

  As described above, when contracting from the stretched state, when the contraction force of the elastic sheet 55 is 100% in the second cycle, it is the same as that of the sample nonwoven fabric. As the applied force becomes smaller and approaches the natural state, the shrinkage force applied to the elastic sheet 55 becomes smaller than the shrinkage force applied to the sample nonwoven fabric. In other words, the shrinkage force when the diaper 10 is worn is substantially the same as that of the elastic sheet and that of the sample nonwoven fabric, but when the diaper 10 shrinks from the stretched state, that is, the elasticity when the diaper 10 is worn. The contraction force of the sheet 55 is smaller than that of the sample nonwoven fabric. The elastic sheet 55 has a contraction force in a case where the elastic sheet 55 returns from a natural state in which no force is applied to a state in which the length dimension is doubled in the lateral direction X to 50% contraction. Since it is 0.5N, more preferably 0.10 to 0.35N, it can be pressed against the wearer's skin with an appropriate contraction force, and the elastic sheet 55 can be prevented from biting into the wearer's skin. it can.

  The elastic sheet 55 shown in FIG. 9 is formed by laminating a nonwoven fabric 553 formed of sheet-like urethane fibers and a nonwoven fabric 554 formed of two sheet-like polyolefin fibers in the thickness direction. Contractile force was measured under the same conditions. The results are shown in Table 2.

  Similarly to the above, the elastic sheet 55 has a contraction force of 0.05 to 0.5 N when returning from a state where the length dimension is doubled in the lateral direction X to a state where it is contracted 50%, more preferably Since it is 0.10-0.35N, it can press on a wearer's skin with moderate contractive force, and it can prevent that the elastic sheet 55 bites into a wearer's skin.

  Experiments described below were performed on the elastic sheet 55 and the sample nonwoven fabric described above.

  The elastic sheet 55 and the sample nonwoven fabric have a length in the vertical direction of 20 mm and a length in the horizontal direction X of 25 mm when no force is applied. The elastic sheet 55 and the sample nonwoven fabric are attached to a mounting plate in which the length in the transverse direction X and the length in the longitudinal direction Y are larger than those of the elastic sheet 55 and the sample nonwoven fabric. The hardness of the edge was measured. The elastic sheet 55 and the sample nonwoven fabric are attached to the attachment plate so that the longitudinal end portion of the attachment plate and the longitudinal sheet edge portion of the elastic sheet 55 and the sample nonwoven fabric coincide with each other. Moreover, the recessed part for attaching the elastic sheet 55 and a sample nonwoven fabric is formed in the attachment plate. The recess is composed of a first recess extending in the lateral direction and a pair of second recesses extending in the vertical direction from both ends of the first recess. The 1st recessed part is formed in the attachment plate in the position 8 mm away from the location which made the edge part of the attachment board correspond with the sheet | seat edge part of the elastic sheet 55 and a sample nonwoven fabric. The pair of second recesses are formed on the mounting plate so that the distance between them is 17 mm. In these 1st recessed part and 2nd recessed part, the elastic sheet 55 and the sample nonwoven fabric were fixed with the tape.

  The hardness of the elastic sheet 55 and the sheet edge of the sample nonwoven fabric was measured using a digital force gauge (manufactured by Nidec Shinpo Co., Ltd .: SHIMPO FGP-0.2). As shown in FIG. 12, this hardness measuring device has a cylindrical detector 81 having a diameter of 6 mm, and the tip of the detector 81 is connected to the sample nonwoven fabric and the elastic sheet 55 on one end and the other. It has the 1st contact part 81a and the 2nd contact part 81b which were divided into two from the base end side to the front end side so that an edge part may contact. Further, the hardness measuring device is pressed against the sheet edge of the elastic sheet 55 and the sample nonwoven fabric at a speed of 100 m / min, and the hardness of the sheet edge of the elastic sheet 55 and the sample nonwoven fabric is measured.

  Table 3 shows the results of measuring the hardness of the elastic sheet 55 and the sheet edge of the sample nonwoven fabric using the hardness measuring apparatus described above.

  As shown in Table 3, the sheet edge of the elastic sheet 55 is about 30% softer than the edge of the sample nonwoven fabric in average.

  As described above, since the end portion of the elastic sheet 55 is softer than the end portion of the sample nonwoven fabric, the feeling of wear can be improved.

  By the way, in the diaper 10 which concerns on this invention, an example of the elastic sheet 55 used for the back waist member 30 fixed to the crotch member 40 is shown below using FIG. The elastic sheet 55 has a dimension W0 in the horizontal direction X in a natural state of 150 mm or more and a dimension L0 in the vertical direction Y of 80 mm. The elastic sheet 55 is joined to the non-elastic sheets 51 and 52 and the crotch member 40 as in the diaper 10.

  In Table 4, in the natural state, when the waistline outer end edge 311 farthest from the virtual lateral center line Q in the rear waist member 30 is the reference line L9, A, B, C, D, E are The distance mm from the reference line L9 to a specific part of the diaper 10 to be described later when the tensile force F is applied is shown.

  Regarding A, in the natural state of the diaper 10, a mark a is placed on the outer edge 559 of the elastic sheet 55. Next, when a tensile force F is applied to the diaper 10 so that the pair of chucks 91 face each other, the distance mm from the reference line L9 to the mark a is A.

  Regarding B, in the natural state of the diaper 10, a mark b is placed at a middle position in the longitudinal direction Y between the sheet outer edge 559 of the elastic sheet 55 and the elastic sheet bisector 55m. Next, when a tensile force F is applied to the diaper 10 so that the pair of chucks 91 face each other, the distance mm from the reference line L9 to the mark b is B.

  Regarding C, in the natural state of the diaper 10, a mark c is placed at the position of the elastic sheet bisector 55m that bisects the longitudinal dimension Y of the elastic sheet 55. Next, when a tensile force F is applied to the diaper 10 so that the pair of chucks 91 face each other, the distance mm from the reference line L9 to the mark c is C.

  With respect to D, in the natural state of the diaper 10, a mark d is placed at a middle position in the longitudinal direction Y between the sheet inner end edge portion 557 of the elastic sheet 55 and the elastic sheet bisector 55m. When the tensile force F is applied so that the pair of chucks 91 are opposed to each other, the distance mm from the reference line L9 to the mark d is D.

  Regarding E, in the natural state of the diaper 10, a mark e is marked on the inner edge portion 557 of the elastic sheet 55 on the side close to the virtual lateral center line Q in the elastic sheet 55. Next, when a tensile force F is applied to the diaper 10 so that the pair of chucks 91 face each other, the distance mm from the reference line L9 to the mark e is E.

  Table 4 shows the relationship between the facing distance between the pair of chucks 91 and A to E. The leftmost column in Table 4 indicates the facing distance mm between the pair of chucks 91.

  As shown in Table 4, while the change is small at the outer edge 559 of the elastic sheet 55, the change becomes larger as it approaches the inner edge 557 of the elastic sheet 55.

  Note that the elastic sheets 55f and 55b described above are described using only elastic fiber nonwoven fabrics. However, the elastic sheet which concerns on this invention is not restricted to what was mentioned above. For example, an elastic sheet constituted by laminating a stretchable fiber nonwoven fabric and a substantially non-stretchable fiber nonwoven fabric in the thickness direction can be used.

  The results obtained by using the above-described tensile tester for this elastic sheet, changing only the dimension in the longitudinal direction Y of the elastic sheet to 50 mm, and performing the other conditions are the same are shown below.

  When the facing distance between the pair of chucks is 200 mm, the dimension in the longitudinal direction Y in the central region is 49 mm. Further, the inner edge side of the sheet in the central region was narrowed inward by 1 mm, while the outer edge side of the sheet did not change.

  When the facing distance between the pair of chucks is 250 mm, the dimension in the longitudinal direction Y in the central region is 47 mm. Further, the inner end edge side of the sheet in the central region was constricted inward by 3 mm, while the outer end edge side of the sheet did not change.

  When the facing distance between the pair of chucks is 300 mm, the dimension in the longitudinal direction Y in the central region is 43 mm. Further, the inner end edge side of the sheet in the central region was constricted 4 mm inward, while the outer end edge side of the sheet was constricted 3 mm inward.

  When the facing distance between the pair of chucks is 325 mm, the dimension in the longitudinal direction Y in the central region is 39 mm. Further, on the inner edge side of the sheet in the central region, it was narrowed 6 mm inward, while on the outer edge side of the sheet, it was narrowed 5 mm inward.

  In the above-described embodiment, the non-elastic sheets 52f and 52b are attached to the non-skin facing surfaces of the elastic sheets 55f and 55b, but the present invention is not limited thereto. For example, a non-elastic sheet may be attached to the skin facing surface of the elastic sheets 55f and 55b. However, if the non-elastic sheets 52f and 52b are attached to the non-skin facing surfaces of the elastic sheets 55f and 55b, the inner and outer edge portions 557 and 559 of the elastic sheets 55f and 55b are exposed to the outside in the wearing state. Therefore, the elastic sheets 55f and 55b can be prevented from peeling off.

  For each constituent member constituting the disposable diaper 10 of the present invention, in addition to the materials described in the specification of the present invention, various known materials that are usually used in this type of article are used without limitation. In the specification and claims of this invention, the terms “first” and “second” are used merely to distinguish similar elements, positions, and the like.

  FIG. 7 shows a modification of the diaper 100 according to the present invention. Since the basic structure of the diaper 100 shown in FIG. 7 is the same as that of the diaper 10 mentioned above, only a different point is demonstrated below.

  In the diaper 10, the elastic sheet 55 and the second inelastic sheet 52 are bonded with, for example, a hot melt adhesive applied to the entire area of the portions facing each other. On the other hand, in the diaper 100, the elastic sheet 55 and the second inelastic sheet 52 are joined by applying a hot-melt adhesive 805 to a portion indicated by a wavy line in the drawing. Specifically, the sheet side edge portions 55s of the elastic sheets 55f and 55b and the side edge portions 52s of the second inelastic sheet 52 are joined, and the sheet outer edge portions 559f and 559b of the elastic sheets 55f and 55b, The main body portion 53 of the second inelastic sheet 52 is joined, and the elastic sheet 55 and the inelastic sheet 52 are not joined in other portions.

  If the elastic sheet 55 and the non-elastic sheet 52 are joined in this manner, the constriction generated in the central region 55c of the elastic sheet 55 when a tensile force is applied is joined to the entire region of the above-described opposing portions. Since it can be made larger than the generated constriction, the crotch member 40 can be lifted further upward.

  The disclosure relating to the present invention described above can be summarized at least in the following matters.

  The diaper 10 has a lateral direction X and a longitudinal direction Y that are orthogonal to each other, a skin facing surface and a non-skin facing surface, and a front waist region 12 and a rear waist region 13 that face each other on the skin facing surface, and a longitudinal direction Y. The crotch region 14 located between the front waist region 12 and the rear waist region 13, the waist members 20 and 30 disposed in the front waist region 12 and the rear waist region 13, and the crotch member 40 disposed in the crotch region 14. A liquid-absorbing structure 40A provided on the crotch member 40, and waist elastic bodies 60 and 70 extending in the lateral direction X in the waist members 20 and 30. The waist members 20 and 30 have outer end edge portions 201 and 311 and inner end edge portions 202 and 312 that face each other in the vertical direction Y, and include elastic sheets 55f and 55b that are stretchable in at least the lateral direction X. The waist elastic bodies 60 and 70 are the 1st waist elastic bodies 61 and 71 arrange | positioned at the outer end edge part 201 and 311 side of the waist members 20 and 30, and the inner end edge parts 202 and 312 of the waist members 20 and 30, respectively. 2nd elastic bodies 62 and 72 arranged at the side of the side. The second waist elastic bodies 62 and 72 do not exist in the regions 79f and 79b of the liquid absorbing structure. The elastic sheet has a sheet side edge 55s in the lateral direction X, a sheet outer edge 559 and a sheet inner edge 557 that face in the longitudinal direction Y, and the sheet inner edge 557 at least in the central region 55c. Is fixed to the crotch member 40, and when a tensile force F is applied between the sheet side edges 55s, the dimension in the longitudinal direction Y in the central area 55c is smaller than the dimension in the longitudinal direction Y at the sheet side edges 55s. In such a manner, at least the central region 55c is deformed so as to be constricted.

The present invention disclosed in the above paragraph [0136] can include at least the following embodiments.
(1) The waist members 20 and 30 include substantially non-stretchable non-elastic sheets 52f and 52b at least in the lateral direction X, and the first waist elastic bodies 61 and 71 are disposed on the non-elastic sheets 52f and 52b. At least the central region 55c of the outer edge portion 559 of the elastic sheet 55f, 55b is fixed to the non-elastic sheet 52f, 52b.
(2) Areas 79f and 79b in which the elastic sheets 55f and 55b overlap the crotch member 40, and the dimensions of the elastic sheets 55f and 55b attached to the crotch member 40 in the lateral direction X do not exist in the second waist elastic bodies 62 and 72. It is larger than the dimension in the horizontal direction X.
(3) The contraction force in the lateral direction X of the elastic sheets 55f and 55b is smaller than the contraction force in the lateral direction X of the first waist elastic body.
(4) The liquid-absorbent structure 40A includes a liquid-permeable surface sheet 41 positioned on the skin facing surface side, a back sheet 42 positioned on the non-skin facing surface side, and between the top sheet 41 and the back sheet 42. And the front and rear end flaps 47f and 47b formed by the top sheet 41 and the back sheet 42 at both ends in the longitudinal direction Y, and an elastic sheet 55f. , 55b are respectively arranged in the front waist region 12 and the rear waist region 13 so as to straddle both end edges of the front and rear end flaps 47f, 47b in the longitudinal direction Y of the liquid absorbent structure 40A.
(5) The elastic sheets 55f and 55b have a larger elongation rate in the horizontal direction X than the elongation rate in the vertical direction Y.
(6) The elastic sheets 55f and 55b cover the front end edge 40f and the rear end edge 40b in the longitudinal direction Y of the crotch member 40, and are extended twice in the lateral direction X with respect to the natural state where no force is applied. Therefore, the contraction force when returning to the contracted state is 0.05 to 0.50 N.

10 Disposable diapers (disposable wearing articles)
11 Waist member 12 Front waist region 13 Rear waist region 14 Crotch region 20 Front waist member 21 Rear waist member 40 Crotch member 40A Liquid absorbing structure 40f Front edge 40b Rear edge 50 Inelastic sheet 51 First inelastic sheet 51f First 1 inelastic sheet 51b first inelastic sheet 52 second inelastic sheet 52f second inelastic sheet 52b second inelastic sheet 55 elastic sheet 55f elastic sheet 55b elastic sheet 55c central region 55s sheet both side edges 60 front waist elastic body 61 Front first waist elastic body (first waist elastic body)
62 Front second waist elastic body (second waist elastic body)
70 Rear waist elastic body 71 Rear first waist elastic body (first waist elastic body)
72 Rear second waist elastic body (second waist elastic body)
79f Absent area 79b Absent area 557 Sheet outer edge 557f Sheet outer edge 557b Sheet outer edge 559 Sheet inner edge 559f Sheet inner edge 559b Sheet inner edge X Horizontal direction Y Vertical direction

Claims (7)

The front waist region and the rear waist region, which have a lateral direction and a vertical direction orthogonal to each other, a skin facing surface and a non-skin facing surface, and face each other on the skin facing surface, and the front waist region and the above in the longitudinal direction A crotch region located between the rear waist regions, a waist member disposed in the front waist region and the rear waist region, a crotch member disposed in the crotch region, and a liquid-absorbing structure provided in the crotch member A disposable wearing article comprising a body and a waist elastic body extending in the lateral direction in the waist member,
The waist member has an outer end edge portion and an inner end edge portion facing in the longitudinal direction, and includes an elastic sheet that is stretchable in at least the lateral direction,
The waist elastic body includes a first waist elastic body arranged on the outer end edge side of the waist member, and a second waist elastic body arranged on the inner end edge side of the waist member,
The second waist elastic body does not exist in the region of the liquid absorbing structure,
The elastic sheet has both side edges of the sheet in the lateral direction, a sheet outer edge and a sheet inner edge facing the longitudinal direction, and the sheet inner edge is at least in the central region. In a mode in which the longitudinal dimension in the central region is smaller than the longitudinal dimension in the sheet both side edges when fixed to the crotch member and a tensile force is applied between the sheet both side edges. The disposable wearing article, wherein the disposable wearing article is deformed so that at least the central region is constricted. The waist member includes an inelastic sheet that is substantially non-stretchable at least in the lateral direction, and the first waist elastic body is disposed on the inelastic sheet,
The disposable wearing article according to claim 1, wherein at least the central region of the outer edge portion of the elastic sheet is fixed to the inelastic sheet.   The said elastic sheet and the said crotch member overlap, The said horizontal dimension of the said elastic sheet attached to the said crotch member is larger than the said horizontal dimension of the area | region where the said 2nd waist elastic body does not exist. Or the disposable wearing article of 2.   The disposable wearing article according to claim 2 or 3, wherein the contraction force in the lateral direction of the elastic sheet is smaller than the contraction force in the lateral direction of the first waist elastic body. The liquid-absorbent structure is interposed between a liquid-permeable surface sheet positioned on the skin facing surface side, a back sheet positioned on the non-skin facing surface side, and the top sheet and the back sheet. And having a front and rear flap formed by the top sheet and the back sheet at both longitudinal edges of the longitudinal direction.
The elastic sheet is disposed in the front waist region and the rear waist region, respectively, so as to straddle both end edges of the front and rear flaps in the longitudinal direction of the liquid-absorbent structure. The disposable wearing article according to 1.   The disposable wearing article according to any one of claims 1 to 5, wherein the elastic sheet has an elongation rate in the transverse direction larger than an elongation rate in the longitudinal direction.   The elastic sheet covers the front end portion and the rear end portion in the longitudinal direction of the crotch member, and returns to a contracted state from a state in which it is stretched twice in the lateral direction with respect to a natural state in which no force is applied. The disposable wearing article according to any one of claims 1 to 6, wherein the shrinkage force in the case is 0.05 to 0.50 N.