JP5592578B1 - Pants-type wearing items - Google Patents

Abstract

An object of the present invention is to provide a pants-type wearing article that can easily pass a foot through a leg opening and can cover a buttock by giving a bulge to a buttock cover.
A worn article (10) includes a buttocks corresponding region (75) and a pair of leak-proof cuffs having a first cuff elastic body (57a) and a second cuff elastic body (57b). Has an innermost rear waist elastic body (80), a buttocks-corresponding elastic body (76), and a buttocks cover part (78) surrounded by the second cuff elastic body, and an elongation stress in a predetermined width of the buttocks elastic part And the extension stress in the predetermined width of the elastic region by the second cuff elastic body is lower than the extension stress in the predetermined width of the elastic region by the innermost rear waist elastic body.
[Selection] Figure 2

Description

  The present disclosure relates to pants-type wearing articles, and more particularly, to pants-type wearing articles such as disposable incontinence pants, disposable toilet training pants, disposable diapers, and other articles having substantially the same configuration.

  2. Description of the Related Art Conventionally, a pants-type wearing article including a chassis, a liquid absorbing structure attached to the skin-facing surface of the chassis, and a pair of leak-proof cuffs is known. For example, Patent Document 1 discloses a chassis that defines a front and rear waist region and a crotch region, a liquid absorbing structure that is attached to a skin-facing surface of the chassis, and a pair of leakage prevention units that are located on both sides of the liquid absorbing structure. A pants-type wearing article having a cuff and having a buttock corresponding area formed by a part of the rear waist region and a part of the crotch region on the rear waist region side is disclosed. In this wearing article, a plurality of rear waist elastic bodies extending in the lateral direction are arranged in the rear waist area, and a hip-corresponding elastic body in which the central part in the lateral direction is curved toward the crotch area side is arranged in the hip-corresponding area. In addition, a plurality of cuff elastic bodies are arranged on the free side edge portion of the leak-proof cuff that can be separated from the liquid absorbing structure. In the buttock corresponding region, on both sides of the liquid absorbing structure, a buttock cover portion surrounded by the innermost rear waist elastic body located on the crotch region side of the rear waist elastic body and the buttock corresponding elastic body is formed. .

JP 2013-255777 A

  According to the wearing article disclosed in Patent Literature 1, the cuff elasticity that can be brought into contact with the wearer's buttocks by the buttocks-corresponding elastic body and is arranged at the free side edge of the leak-proof cuff The body can raise a leak-proof cuff to prevent side leakage of body fluid.

  However, in the worn article in Patent Document 1, the buttock cover portion can be placed along the wearer's buttock, but the buttock cover portion cannot be covered so as to wrap around the heel portion. In particular, the plurality of cuff elastic bodies are arranged only on the free side edge of the leak-proof cuff and do not act on the buttock cover part. Therefore, the inner part of the buttock cover part close to the liquid absorbing structure is flat. It is formed and does not exhibit a three-dimensional shape. Moreover, in the wearing article in patent document 1, the separation interval of the elastic body corresponding to the buttock is narrower than the separation interval of the rear waist elastic body, and the elongation stress in the predetermined width of the buttock elastic portion is the elastic region due to the innermost rear waist elastic body. Therefore, the leg opening becomes narrow and it is difficult to pass the foot.

  Therefore, an object of the present invention is to improve the conventional technique, and it is easy to pass a leg through a leg opening at the time of wearing, and a pants-type wear that can cover a buttock by forming a buttock cover part in three dimensions The provision of goods.

  In order to achieve the above object, the present invention has a longitudinal direction and a lateral direction, a skin facing surface and a non-skin facing surface located on the opposite side thereof, a front waist region, a rear waist region, and the front and back sides. A chassis that defines a crotch region positioned between the waist regions, a liquid absorbing structure disposed on the skin-facing surface side of the chassis, and a waist that is defined by connecting both side edges of the front and rear waist regions The present invention is to improve a pants-type wearing article including an opening and a pair of leg openings.

In the present invention, the chassis includes a rear waist elastic region in which a plurality of rear waist elastic bodies spaced apart in the longitudinal direction in the rear waist region are attached in a stretched state so as to be contractible in the lateral direction, and the rear waist region Part of the crotch region and a portion corresponding to the buttock formed by the portion of the crotch region on the rear waist region side, and the liquid absorption structure is separated from the absorbent core in the lateral direction and the longitudinal direction. and a pair of leak-barrier cuffs extending in said leak-barrier cuffs, the proximal edge is joined to the absorbent structure, and a distal edge capable spaced from the liquid-absorbent structure, the distal A first cuff elastic body attached to the edge portion so as to be retractable in the longitudinal direction in a stretched state; and a first cuff elastic body attached to the proximal edge portion side of the distal edge portion so as to be shrinkable in the longitudinal direction. A two-cuff elastic body, and A collar portion in which the central portion in the lateral direction extends in a curved shape toward the crotch region between the inner end portions adjacent to the crotch region at both side edges of the strike region and overlaps with the liquid absorbing structure in plan view A corresponding elastic body, a collar elastic portion to which the collar corresponding elastic body is attached, an innermost rear waist elastic body located closest to the crotch region among the rear waist elastic bodies, the collar corresponding elastic body, and the second A collar cover part surrounded by a cuff elastic body, the collar elastic part being located on the outer side in the lateral direction of the absorbent core, the straight part extending linearly in the lateral direction, and the leg opening A pair of inclined portions extending along the vertical direction, and the collar cover portion has a maximum dimension in the longitudinal direction of 60 to 80% of a dimension in the longitudinal direction of a side edge portion of the rear waist region. Yes, the second cuff elasticity Is arranged such that the extensional stress is lower than that of the first cuff elastic body, is spaced apart from the innermost rear waist elastic body in the longitudinal direction, and at least one of the second cuff elastic bodies is in plan view The extension stress in the predetermined width of the inclined portion and the extension stress in the predetermined width of the elastic region by the second cuff elastic body are disposed in the absence region of the absorbent core. It is characterized by being lower than the elongation stress in a predetermined width of the elastic region by the innermost rear waist elastic body located on the outer side in the direction .

  According to one or more embodiments of the pants-type wearing article according to the present invention, the second cuff elastic body is disposed closer to the proximal edge than the distal edge of the leak-proof cuff, and the buttocks cover part is Since the innermost rear waist elastic body, the buttocks-corresponding elastic body, and the second cuff elastic body are surrounded, the inner portion of the buttocks cover portion can be contracted to form the buttocks cover portion in three dimensions. Further, since the extension stress in the predetermined width of the elastic region by the second cuff elastic body and the extension stress in the predetermined width of the elastic region by the second cuff elastic body are lower than the extension stress in the predetermined width of the elastic region by the innermost rear waist elastic body, the wearer Can be covered flexibly so as not to tighten the buttocks strongly. Moreover, since the extension stress in the predetermined width of the buttocks elastic part is lower than the extension stress in the predetermined width of the elastic region by the innermost rear waist elastic body, the leg opening can be widened to make it easy to pass the foot.

The drawings illustrate certain embodiments of the invention according to the present disclosure and include selective and preferred embodiments as well as essential configurations of the invention.
The perspective view seen from the back side of the underpants type disposable diaper in a 1st embodiment shown as an example of the underpants type wearing article concerning this indication. The partially broken expansion | deployment top view of the diaper extended to the vertical direction and the horizontal direction until the maximum expansion | extension of each elastic body (to the extent that the gathers by the contraction effect | action of an elastic member are lost). The partially broken disassembled perspective view of a diaper. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 2. The top view of a chassis. The elements on larger scale of the area | region enclosed with the dashed-dotted line VI shown in FIG. (A): The perspective view seen from the back side in the wearing state of a diaper. (B): Schematic cross-sectional view along the line VIIb-VII. The top view of the chassis similar to FIG. 5 in 2nd Embodiment.

<First Embodiment>
The following embodiment relates to a pants-type wearing article shown in FIGS. 1 to 4 which is an example of the present invention according to the present disclosure, and includes not only an indispensable structure of the invention but also a selective and preferable structure. In FIG. 2, each elastic body, which will be described later, has a natural visual perception of gathers generated in the member to which each elastic body is attached due to the contracting force in the lateral direction X and the longitudinal direction Y against the contracting force. It has been stretched to such an extent that it seems to be lost.

  Referring to FIGS. 1 to 3, a disposable pant-type diaper 10 which is an example of a pant-type wearing article according to the present invention includes a vertical direction Y and a horizontal direction X that are orthogonal to each other, a skin facing surface, and a non-facing surface on the opposite side. It has a skin-facing surface, a vertical axis P that bisects the length dimension in the vertical direction Y, and a horizontal axis Q that bisects the length dimension in the horizontal direction X, and is substantially symmetrical with respect to the vertical axis P. And the front waist region 11, the back waist region 12, and the crotch region 13 located between the front waist region 11 and the back waist region 12 are included.

  The diaper 10 further includes a chassis 14 in the form of a base, and a liquid absorbing structure 15 that is located on the skin facing surface of the chassis 14 and extends in the longitudinal direction Y with the crotch region 13 as the center. The chassis 14 has a concave curved shape at both side edges that define the crotch region 13, and the narrowest part of the crotch region 13 is offset from the horizontal axis Q toward the front waist region 11. The front side edges 11a and 11b of the front waist region 11 and the rear side edges 12a and 12b of the rear waist region 12 are side surfaces where the side edges facing each other in the front-rear direction of the diaper 10 extend intermittently in the longitudinal direction Y. By being connected by a seam 22, a waist opening 23 and a pair of leg openings 24 are defined. In the side seam 22, sheets that overlap each other are fused by known means such as embossing / debossing by heat or ultrasonic waves.

  The chassis 14 is located on the skin facing surface, and is positioned on the non-skin facing surface side, for example, a base sheet 25 made of fiber nonwoven fabric, which defines the front and rear waist regions 11 and 12 and the crotch region 13 in series. A front waist sheet 26 and a rear waist sheet 27 made of, for example, a fiber nonwoven fabric, which are spaced apart from each other, are further included.

<Base sheet>
The base sheet 25 includes first and second end edges 25a and 25b that are spaced apart in the vertical direction Y, and both side edges 25c and 25d that are spaced apart in the horizontal direction X. Both side edges 25c and 25d are formed from a straight portion in the front and rear waist regions 11 and 12 and a curved portion that protrudes deeper from the rear waist region 12 side toward the front waist region 11 side toward the vertical axis P in the crotch region 13. It is formed.

<Front waist seat>
The front waist seat 26 has a substantially trapezoidal shape that forms the front waist region 11 and a part of the crotch region 13, and extends in the longitudinal direction Y, with an intermediate inner edge 26 a and an outer edge 26 b extending in the lateral direction X. Both outer edges 26c and 26d, and both inner edges 26e and 26f connecting both outer edges 26c and 26d and the intermediate inner edge 26a are formed. The inner side edges 26e and 26f on both sides have a straight part extending straight from the outer edges 26c and 26d in the lateral direction X and a curved part extending from the straight part to the intermediate inner edge 26a. The front waist seat 26 has a rectangular main body 29 extending in the lateral direction X between both outer edges 26c and 26d, and a width narrower than the main body 29, and is located between both inner end edges 26e and 26f. And an exit 30. The main body portion 29 has a bent portion 33 that is bent inward along the waist opening edge. The bent portion 33 is bent inward along the first end edge 25a of the base sheet 25 in a state where the liquid absorbing structure 15 is disposed on the inner surface of the base sheet 25, and the base sheet 25 and the liquid absorbing structure 15 are thus bent. Fixed to the skin facing surface.

<Rear waist seat>
The rear waist sheet 27 has a substantially trapezoidal shape that forms the rear waist region 12 and a part of the crotch region 13, and extends from the intermediate inner edge 27a and the outer edge 27b extending in the lateral direction X, and from the outer edge 27b. Both outer edges 27c, 27d extending in the vertical direction Y, and both inner edges 27e, 27f that connect the outer edges 27c, 27d and the inner edge 27a in a curved shape are formed. The rear waist seat 27 has a rectangular main body 34 extending in the lateral direction X between the outer edges 27c and 27d, and is narrower than the main body 34, and is located between the inner end edges 27e and 27f on both sides. A trapezoidal extension 35. The main body 34 has a bent portion 38 that is bent inward along the waist opening edge. The bent portion 38 is bent inward along the second end edge 25b of the base sheet 25 in a state where the liquid absorbing structure 15 is disposed on the inner surface of the base sheet 25, and the base sheet 25 and the liquid absorbing structure 15 are thus bent. Fixed to the skin facing surface.

  Referring to FIGS. 3 to 5, a front waist elastic body 72 extending in the lateral direction X in the main body portion 29 is attached between the front waist sheet 26 and the base sheet 25 so as to be contracted in an extended state. Between the rear waist sheet 27 and the base sheet 25, a rear waist elastic body 74 extending in the lateral direction X in the main body portion 34, and a buttocks corresponding elastic body 76 extending in a curved shape from the main body portion 34 to the extending portion 35, Is attached in a stretched state so as to be contractible. The front and rear waist regions 11 and 12 have elastic elastic members 71 and 73 and a buttocks elastic portion 77, which will be described later, by arranging each elastic body.

As the base sheet 25 and the front and back waist sheets 26 and 27, for example, a spunbond fiber nonwoven fabric having a mass of, for example, about 10 to 40 g / m ² and a fiber density of, for example, about 0.03 to 0.10 g / cm ^3. SMS (spunbond / meltblown / spunbond) fiber nonwoven fabric, air-through fiber nonwoven fabric, moisture-permeable plastic sheet, or laminate sheet thereof can be used. In the present embodiment, the base sheet 25 has a mass of about 10 to 18 g / m ² , preferably a mass of about 13 g / m ² , and the front and rear waist sheets 26 and 27 have a mass of about 15 to 25 g / m ² . Preferably, a spunbond fiber nonwoven fabric having a mass of about 20 g / m ² can be used.

  In the present embodiment, the outer surfaces of the front and rear waist sheets 26 and 27 are optionally subjected to grid-like embossing / debossing, and uneven embossing / debossing patterns 28 are arranged. The emboss / deboss pattern 28 is not limited to a lattice pattern, and may be formed in other patterns such as a circular shape. By embossing / debossing the outer surfaces of the front and rear waist sheets 26, 27, the flexibility of the sheet is improved, the touch is improved, and the appearance like underwear can be provided. Moreover, in this embodiment, although the center part 13C of the crotch area 13 is formed only from the base sheet 25, you may form from suitable sheets, such as a some fiber nonwoven fabric. However, when the central portion 13C of the crotch region 13 is formed from a single-layer sheet, it is more flexible than the case where the central portion 13C is formed from a plurality of layers. It becomes easy to deform along the shape of the body when sandwiched between thighs. Moreover, manufacturing cost can be held down by forming a part of the chassis 14 with a single layer sheet.

  Speaking of each dimension of the diaper 10 (the same as the corresponding dimension of the chassis 14), the dimension L1 in the longitudinal direction Y of the diaper 10 is about 600 to 1000 mm, the dimension W1 in the lateral direction X is about 400 to 800 mm, and the front waist region 11 It is preferable that the dimension L2 in the longitudinal direction Y of the front edge portions 11a and 11b (the same as the dimension in the longitudinal direction Y of the rear edge portions 12a and 12b of the rear waist region 12) is about 80 to 150 mm.

<Liquid absorption structure>
2 and 3, the liquid absorption structure 15 has a front end portion 15A, a rear end portion 15B, and a central portion 15C located between the front and rear end portions 15A and 15B. The liquid-absorbing structure 15 is located on the skin-facing surface side, for example, a body-side liner 50 made of a fiber nonwoven fabric having liquid permeability, a liquid-absorbing absorber 51 having curved side edges, and a pair of barriers. A cuff sheet 52 and a leak-proof back sheet 53 are included. The absorbent body 51 is, for example, a core material formed from a mixture of fluff pulp having a mass of about 0 to 500 g / m ² and absorbent polymer particles and the like, and liquid absorption diffusion such as tissue paper encapsulating the entire core material Sex core wrap sheet. The body side liner 50, the barrier cuff sheet 52, and the leak-proof back sheet 53 form end flaps 56 a and 56 b extending from the front end edge 51 a and the rear end edge 51 b of the absorber 51 in the longitudinal direction Y, respectively. The liquid absorbing structure 15 and the chassis 14 (base sheet 25) have a bonding area 60 formed from a known bonding means such as a hot melt adhesive applied in an appropriate pattern on at least one of the opposed surfaces thereof. Are joined to each other. In the present embodiment, the bonding area 60 is configured by a plurality of bonding sites spaced in the longitudinal direction Y, but may be a continuous bonding area so as to bond the entire back surface of the liquid absorbing structure 15. .

  Referring to FIG. 2, the pair of barrier cuff sheets 52 are elongated in the vertical direction Y, folded in two and fixed to each other, and fixed to the skin facing surface of the body side liner 50. It has a front fixing portion and a rear fixing portion that face each other in the direction Y, a proximal edge portion 52b that extends in the longitudinal direction Y, and a distal edge portion 52a that is located inward in the lateral direction X from the proximal edge portion 52b. In the distal edge 52a of the barrier cuff sheet 52, a first cuff elastic body 57a extending in the longitudinal direction Y, between the proximal edge 52b and the distal edge 52a, that is, the distal edge 52a in plan view. At least one second cuff elastic body 57b is attached to the outer side in the lateral direction X so as to be retractable in an extended state. By contracting the first cuff elastic body 57a, the distal edge 52a is separated from the body-side liner 50 toward the wearer's body, and a pair of leak-proof cuffs for preventing side leakage of body fluid is formed. . The leak-proof back sheet 53 is formed of, for example, a liquid-impervious fiber nonwoven fabric, a liquid-impervious and moisture-permeable plastic film, or a laminate sheet thereof, and covers at least almost the entire lower surface of the absorbent body 51. It is arrange | positioned and it prevents that a bodily fluid leaks from the non-skin opposing surface (bottom surface) side of the liquid absorption structure 15. FIG.

  The first cuff elastic body 57a and the second cuff elastic body 57b can be formed of, for example, a string-like or strand-like elastic material. The elastic material is arranged so that the extension stress of the second cuff elastic body 57b is lower than the extension stress of the first cuff elastic body 57a by appropriately setting the material, fineness, and extension ratio. In the present embodiment, the first cuff elastic body 57a is made of two elastic materials having a fineness of 620 dtex and an expansion ratio of about 3.0 times, and the second cuff elastic body 57b includes the first cuff elastic body 57a and the first cuff elastic body 57a. The same material is made of two elastic materials having a fineness of 470 dtex and an expansion ratio of about 2.7 times. The first cuff elastic body 57a is arranged so that at least a portion thereof overlaps with the region where the absorber 51 exists in a plan view (Z direction), and at least one elastic body (outermost) of the second cuff elastic body 57b. The outermost cuff elastic body 58) is positioned so as not to overlap the absorber 51 in plan view.

<Front waist elastic area>
2 and 5, the front waist elastic region 71 includes a front outer elastic region 71a extending in the lateral direction X on the waist opening edge side, a front inner elastic region 71c extending in the horizontal direction X on the crotch region 13 side, and the front A front intermediate elastic region 71b located between the outer and front inner elastic regions 71a and 71c. The rear waist elastic region 73 includes a rear outer elastic region 73a extending in the lateral direction X on the waist opening edge side, a rear inner elastic region 73c extending in the horizontal direction X on the crotch region 13 side, and rear outer and rear inner elastic regions 73a and 73c. And a rear intermediate elastic region 73b located therebetween.

<Each elastic body>
The front waist elastic body 72 is formed of, for example, a string-like or strand-like elastic material having a fineness of about 450 to 1240 dtex and stretched about 1.5 to 3.5 times from a contracted or relaxed state. be able to. In the present embodiment, the front waist elastic body 72 positioned in the front outer elastic region 71a is made of, for example, a plurality of elastic materials having a fineness of 620 dtex and an expansion ratio of about 2.3 times, and is spaced by 6 mm in the longitudinal direction Y. Are spaced apart. The front waist elastic body 72 positioned in the front intermediate elastic region 71b is positioned so as to overlap with the end flap 56a of the liquid absorbing structure 15 in a plan view. For example, the front waist elastic body 72 has a fineness of 470 dtex and an expansion ratio of about 2.3 times. It is made of an elastic material of strips and is arranged about 10 mm apart in the longitudinal direction Y. The front waist elastic body 72 located in the front inner elastic region 71c is made of, for example, five elastic materials having a fineness of 780 dtex and a plurality of elastic materials having a fineness of 620 dtex, each having an expansion ratio of about 2.5 times. In the longitudinal direction Y, they are spaced from each other by about 7.5 mm.

  The back waist elastic body 74 is formed of, for example, a string-like or strand-like elastic material having a fineness of about 450 to 1240 dtex and stretched about 1.5 to 3.5 times from a contracted or relaxed state. be able to. In the present embodiment, the rear waist elastic body 74 positioned in the rear outer elastic region 73a is made of, for example, a plurality of elastic materials having a fineness of 620 dtex and an expansion ratio of about 2.3 times, and is spaced by 6 mm in the longitudinal direction Y. Are spaced apart. The rear waist elastic body 74 located in the rear intermediate elastic region 73b is arranged in a region where at least one elastic body overlaps the end flap 56b of the liquid absorbing structure 15, and has a fineness of 780 dtex and an expansion ratio of about 2.1, for example. It consists of four times as many elastic materials and is spaced apart in the longitudinal direction Y at intervals of 7 mm. The rear waist elastic body 74 located in the rear inner elastic region 73c is made of, for example, a plurality of elastic materials having a fineness of 780 dtex and an expansion ratio of 2.5, and is spaced apart by 15 mm in the longitudinal direction Y. .

  By appropriately setting the material of the elastic body, the fineness, the expansion ratio, and the separation distance in each of the rear waist elastic regions 73a, 73b, and 73c, the elongation stress of the rear inner elastic region 73c is higher than the elongation stress of the rear intermediate elastic region 73b. It is preferable to do. Specifically, the elongation stress at the time of 171% elongation (71% dimension when the maximum elongation dimension is 100%) in a predetermined width (30 mm width) of the portion outside the lateral direction X of the absorber 51 is: The rear intermediate elastic region 73b is about 2.0 to 6.0N, the rear inner elastic region 73c is about 3.0 to 8.0N, and the correlation between the elongation stress is as follows: rear inner elastic region 73c> rear outer elastic region 73a ≧ rear intermediate elastic region 73b. Thus, by making the elongation stress of the elastic region 73a on the waist opening 23 side higher than the other elastic regions 73b and 73c, the waist opening edge can be stably held around the waist of the wearer, In addition, by setting the extension stress of the rear intermediate elastic region 73b to be lower than that of the rear inner elastic region 73c, when the foot tip is inserted from the waist opening 23 during wearing, The circumferential dimension becomes large, and it becomes easy to insert the foot toward the leg opening 24. In order to exhibit such an effect more, the correlation of the elongation stress in the front waist elastic region 71 is the front outer elastic region 71a ≧ the front inner elastic region 71c> the front intermediate elasticity similarly to the correlation of the rear waist elastic region 73. The region 71b is preferable.

<Welcome area>
Referring to FIG. 5, the chassis 14 has a flange corresponding region 75 extending from the rear inner elastic region 73 c to a part of the crotch region 13, specifically, to the intermediate inner edge 27 a of the rear waist seat 27 in the crotch region 13. . The buttocks corresponding area 75 has a buttocks elastic part 77 to which a plurality of ribs corresponding elastic bodies 76 extending in a curved shape so as to protrude toward the horizontal axis Q are attached so as to be contracted in an extended state. The buttocks elastic part 77 includes a straight part 76a that extends in a straight line in the lateral direction X along the vicinity of the intermediate inner end edge 27a of the rear waist sheet 27, and a collar part-corresponding elastic body 76 that overlaps the liquid absorbing structure 15. The corresponding elastic body 76 does not overlap the liquid absorbing structure 15 and has inclined portions 76b located on both sides of the straight portion 76a.

  The hip-corresponding elastic body 76 has, for example, a fineness of about 500 to 800 dtex, an expansion ratio of the straight part 76a of about 1.0 to 1.5 times, and an expansion ratio of the inclined part 76b of about 1.2 to 2. It can be formed from, for example, a plurality of string-like or strand-like elastic materials that have been adjusted and stretched to 5 times. Further, the extension stress of the straight portion 76a in the predetermined width in the collar elastic portion 77 is lower than the extension stress in the predetermined width of the inclined portion 76b. Thus, by making the expansion ratio of the straight portion 76a lower than that of the inclined portion 76b and making the extension stress of the straight portion 76a lower than the extension stress of the inclined portion 76b, both sides of the liquid absorbing structure 15 are obtained. It is possible to stably fit the portion located in the body to the body, and it is possible to suppress the liquid absorption structure 15 from being deformed by the contraction action of the buttocks corresponding elastic body 76 and inhibiting the liquid absorption performance.

  The dimensions in the longitudinal direction Y of the respective elastic regions in the front and rear waist regions 11 and 12 can be classified so as to have a predetermined ratio as long as the effects of the present invention are exhibited. For example, the dimension in the longitudinal direction Y of the front and rear intermediate elastic areas 71b and 73b and the front and rear inner elastic areas 71c and 73c is 1.0 to 2.5 times larger than the dimension in the longitudinal direction Y of the front and rear outer elastic areas 71a and 73a. It can also be set so that the dimensions of each elastic region in the longitudinal direction Y can be equally divided. It is preferable that the longitudinal dimensions Y of the front and rear outer elastic regions 71a and 73a are set equal.

  Further, in the rear waist region 12, the innermost rear portion located closest to the crotch region 13 in the rear waist elastic body 74 by positioning the buttocks corresponding elastic body 76 in the vicinity of the inner ends of the rear edge portions 12a and 12b. The waist elastic body 80 is separated from the inner end portion 83 of the rear edge portion 12a by a given dimension, and the separation dimension R2 in the longitudinal direction Y is located closest to the crotch region 13 in the front waist elastic body 72. The innermost front waist elastic body 79 and the inner edge portion 82 of the front side edge portions 11a and 11b of the front waist region 11 are larger than the separation dimension R1 in the longitudinal direction Y. That is, the innermost front waist elastic body 79 is located closer to the leg opening 24 than the innermost rear waist elastic body 80. Thus, the innermost front waist elastic body 79 is positioned closer to the leg opening 24 than the innermost rear waist elastic body 80, so that the width dimension (the dimension in the longitudinal direction Y) of the front waist elastic region 71 is relatively large. It becomes larger than the width dimension of the rear waist elastic region 73 and extends in a belt shape along the wearer's abdomen protruding forward, thereby being stably fitted. Further, the leg opening edge is deformed so that the front side contracts and the shape of the leg opening 24 is convex forward, so that it is possible to prevent the leg opening edge from being caught when the foot tip is inserted. .

  6 is a partially enlarged plan view of a region surrounded by a one-dot chain line VI in FIG. 2, and FIG. 7 is a perspective view as seen from the back side in the wearing state of the diaper 10. 6 and 7, only the buttock cover portion 78 located on one side in the lateral direction X of the absorber 51 has been described, but the buttock cover portion 78 located on the other side also has the same configuration. In FIG. 7, the reference figure for clarifying the aspect of the buttocks cover part 78 in a wearing condition is shown.

  6 and 7, on the both sides of the absorbent body 51 in the buttock corresponding region 75, the buttock corresponding elastic body 76, the innermost rear waist elastic body 80 and the second cuff elastic body 57b, or the elastic bodies thereof, A collar cover portion 78 surrounded by each elastic region where the contraction force of each elastic body acts is formed. The buttock cover portion 78 is positioned facing the wearer's buttock 81 in the worn state, and the entire region formed of the flexible sheet member is surrounded by each elastic body, so that it swells outward. It takes the form like this. Here, in a normal disposable wearing article, the central portion 13C of the crotch region 13 is attracted to the buttocks by movement of the wearer or the like while being worn, or a part of the crotch region 13 is sandwiched between cracks. The part may be exposed to the outside. In particular, in a so-called three-piece structure diaper in which the front and rear waist regions 11 and 12 are formed from separate panels, such a situation is likely to occur, and a diaper having a buttock sheet covering an exposed buttock to prevent it is It is known. However, such a buttock sheet is intended to cover the ridge that has already been exposed to the outside, and is not intended to prevent exposure of the buttock itself.

  Referring to FIG. 7 (b), in the present embodiment, since the buttock cover portion 78 is shaped so as to bulge outward so as to cover the entire heel portion 81, it is caused by the movement of the wearer. Even if the buttocks-corresponding elastic body 76 and / or the second cuff elastic body 57b that delimits is pulled toward the central portion 13C side of the crotch region 13, it is pulled as shown by the phantom line in FIG. Since the portion that bulges outward by an amount is expanded and fits into the flange 81, there is no possibility that the rear leg opening edge enters the width and the flange 81 is exposed. Therefore, it is possible to prevent discomfort and leakage of excrement due to the exposure of the buttocks 81 from the diaper 10. In particular, in the diaper 10 according to the present embodiment, since the central portion 13C of the crotch region 13 is formed from a single layer sheet, the diaper 10 is deformed by being sandwiched between the crotch of the wearer. It is easy to be pulled down and this effect can be exhibited.

  In addition, in the present embodiment, in the present embodiment, there is a possibility that the diaper may be easily recognized as an external appearance in a form in which the diaper bulges outward in the region where the absorber 51 exists. When the buttock cover portion 78 made of a flexible sheet member has a form that bulges outward, the entire back surface of the diaper swells, giving a soft underwear-like impression. In particular, the present embodiment is embossed / debossed on the outer surfaces of the front and rear waist sheets 26 and 27 to improve flexibility, so that it is easy to bulge outward and give a soft and soft impression. / The debossed pattern 28 can have an appearance like underwear

  In each elastic region forming the buttock cover portion 78, the extension stress in the predetermined width of the buttock elastic portion 77 and the extension stress in the predetermined width of the elastic region by the second cuff elastic body 57b are the most crotch region in the rear waist elastic body 74. It is set lower than the elongation stress in a predetermined width of the rear inner elastic region 73c including the innermost rear waist elastic body 80 located on the 13th side. Specifically, in each of the rear waist elastic regions 73a, 73b, and 73c, at a predetermined width (30 mm width) of a portion outside the lateral direction X of the absorbent body 51 at the time of 171% extension (the dimension at the maximum extension is 100%) The elongation stress in the dimension (71% of the time) is about 3.0 to 8.0 N for the rear inner elastic region 73 c, about 0.5 to 5.0 N for the buttocks elastic part 77, and the second cuff elastic body of the leak-proof cuff At the time of 171% elongation in the predetermined width of the elastic region due to 57b, it is about 1.0 to 5.0N, and the correlation of the elongation stress is as follows: rear inner elastic region 73c> elastic region due to second cuff elastic body 57b ≧ buttock elasticity Part 77.

  In order to gently bulge the buttock cover portion 78 so as to wrap the buttock and prevent the buttock from being strongly tightened, the elongation stress of each elastic region that defines it is set to be relatively low. It is preferable to have a required elongation stress in a region where the wearer's waistline is stably held. In the present invention, the elongation stress of each elastic region has the above-mentioned correlation, and the rear inner side that comes into contact with the region where the wearer's waist is held, particularly, the portion where the iliac bone to be held most stably is located While the elastic region 73c has a required elongation stress and can effectively prevent the diaper from slipping down in the wearing state, the elastic region 73c is set to be lower than that in other elastic regions. There is no risk of discomfort.

  In addition, since the inclined portion 76b of the collar corresponding elastic body 76 has a curved shape, it can be expanded and contracted in the horizontal direction X and the vertical direction Y (or all directions). Therefore, when the buttock corresponding elastic body 76 is extended in the horizontal direction X as a whole as a whole, the buttock cover portion 78 is worn when it is pulled downward and the buttock cover portion 78 becomes flat. It can be extended in four directions along the shape of the person's buttocks to fit the body. Further, as assumed functions of the buttock cover portion 78, for example, the second cuff elastic body 57 b that defines the buttock cover portion 78 expands and contracts in conjunction with the movement of the absorbent body 51 due to the movement of the wearer. When the elastic body 76 expands and contracts, the buttock cover portion 78 repeatedly contracts and expands, and external air enters the buttock cover portion 78 from a gather (leg gather) formed by the buttock corresponding elastic body 76 at that time. The pump function which prevents the diaper 10 from being stuffy by leaving is considered.

  The second cuff elastic body 57b has a lower elongation stress than the first cuff elastic body 57a. The second cuff elastic body 57b forms a virtual elastic band that surrounds the leg opening edge by the front waist elastic body 72 and the buttocks corresponding elastic body 76 intersecting with the second cuff elastic body 57b. Functions to assist the standing of the leak-proof cuff and does not require a relatively high elongation stress. Accordingly, the first cuff elastic body 57a has a relatively high elongation stress for raising the distal edge 52a of the leak-proof cuff to exert a sufficient leak-proof function, while the second cuff elastic body 57b has a heel portion. It is sufficient to have a relatively low extensional stress that forms the cover portion 78, and the extensional stress of the entire leak-proof cuff becomes too high to suppress tightening of the body. Further, among the second cuff elastic bodies 57b, the outermost cuff elastic body 58 located on the outermost side in a plan view is disposed in the non-existing region of the absorber 51, and thus resists the rigidity of the absorber 51. Since it does not shrink, the base sheet 25 and the rear waist sheet 27 can be shrunk to such an extent that the buttock cover portion 78 can be formed even with a relatively low elongation stress.

  In order to form the buttock cover portion 78 so as to swell outward to the extent that it covers the entire buttock portion, the entire surface area of the buttock cover portion 78 needs to be relatively large. In this embodiment, Since the dimension of the vertical direction Y of the collar part cover part 78 is large compared with the other normally used diaper, it has a comparatively large surface area. Specifically, the dimension in the maximum vertical direction Y of the buttock cover part 78 (the distance between the innermost rear waist elastic body 80 and the straight part 76a of the buttock-corresponding elastic body 76; see FIG. 6) L3 is the rear waist. The rear side edges 12b and 12c of the region 12 have a size of about 60 to 80% of the dimension L2 in the longitudinal direction Y.

  Further, at both side edges of the rear waist region 12, the buttocks corresponding elastic body 76 and the innermost rear waist elastic body 80 (rear waist elastic body 74) are separated from each other in the longitudinal direction Y and intersect each other in plan view. Not. Since these elastic bodies do not intersect, the buttock corresponding elastic body 76 is not directly affected by the contracting action of the rear waist elastic body 74 in the direction around the waist. While fitting a part to a body, the curved convex shape cover part 78 can be formed by the curved shape. In order to exhibit such an effect, it is preferable that the separation dimension R3 in the longitudinal direction Y between the innermost rear waist elastic body 80 and the buttocks corresponding elastic body 76 in the rear edge portions 12a and 12b is about 100 to 180 mm. When the separation dimension R is less than about 100 mm, the contraction force of the elastic body 80 may affect the buttocks corresponding elastic body 76, and when the separation dimension R3 exceeds about 200 mm, the inclined portion 76 b and the elastic body 80. This is because the non-elastic region located between the two and the wearer's fit may be reduced.

  Further, the separation dimension (pitch) between the buttocks corresponding elastic bodies 76 is set smaller than the separation dimension between the rear waist elastic bodies 74 in the rear inner elastic region 73c. The elastic region including the innermost rear waist elastic body 80 may form a wide belt-like elastic region that can stably fit around the waist of the wearer by relatively increasing the separation dimension between the elastic bodies. On the other hand, by making the width dimension of the collar elastic part 77 relatively small, the collar elastic part 77 can be separated from the leg opening edge by a given dimension.

Second Embodiment
FIG. 8 is a plan view of a chassis similar to FIG. 5 according to the second embodiment of the present invention, and the absorber 51 is indicated by a virtual line. Since the basic configuration of the diaper 10 according to the present embodiment is the same as that according to the first embodiment, only differences will be described below.

  In the present embodiment, in the region where the front waist elastic region 71 overlaps the absorber 51 in plan view, a non-elastic region 91 where the contraction force of the front waist elastic body 72 is not substantially exerted is defined. In the region of the rear waist elastic region 73 and the buttock elastic portion 77 that overlaps the absorber 51 in plan view, inelastic regions 92 and 93 in which the contraction force of the elastic bodies 74 and 76 is not substantially exhibited are defined. Has been. By defining each inelastic region 91-93, the contraction force of each elastic body 72, 74, 76 is deformed to induce leakage of the absorbed body fluid by acting directly on the absorber 51. Can be suppressed. In order to achieve such an effect, it is sufficient that at least one of the non-elastic regions 91 to 93 is defined. The elastic region other than the elastic region in which the non-elastic region is formed in a portion overlapping the absorber 51 is It may extend continuously in the lateral direction X as in the first embodiment. Each of the non-elastic regions 91 to 93 can be formed by various methods known in this type of field. For example, each elastic body is non-joined in the region and is cut and cut back (so-called snap back). Or by removing the elastic body in the region or applying an elastic deterioration process.

<Method for measuring elongation stress>
The tensile stress of each elastic region of the front and rear waist elastic regions 71 and 73 is set to 100 mm / min using a tensile tester (INSTRON model: 5564) manufactured by Instron Japan Company Limited. Measured with For a portion of each elastic region that does not overlap with the absorber, a specimen having a length in the lateral direction X of 30 to 50 mm is cut out from the portion, and the specimen in the natural state has a separation dimension in the lateral direction X. A pair of 20 mm marked lines is entered, and the extension force of each specimen when it is extended until the separation dimension becomes 1.7 times is obtained and compared. In addition, when the dimension of the longitudinal direction Y of the diaper 10 which is the width dimension in each test piece is not constant, each extension stress when converted to a value in the case of a width of 30 mm for each test piece Compare the specimens. The same measurement was performed for the elastic region by the inclined portion 76b of the flange elastic portion 77 and the second cuff elastic body 57b of the leak-proof cuff. It should be noted that in the collar elastic part 77, a specimen having a width of 30 mm is cut and measured along the inclined part 76b of the collar corresponding elastic body 76, and the specimen in the longitudinal direction Y is measured in the elastic region by the second cuff elastic body 57b. Was cut and measured.

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

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

  The wearing article 10 has a longitudinal direction Y and a lateral direction X, a skin facing surface and a non-skin facing surface located on the opposite side, a front waist region 11, a rear waist region 12, a front and back waist region 11, A chassis 14 that defines a crotch region 13 located between 12, a liquid absorbing structure 15 disposed on the skin-facing surface side of the chassis 14, and both side edges 11 a, 12 a, 11 b of the front and rear waist regions 11, 12. , 12b, and a pair of leg openings 24. The chassis 14 includes a rear waist elastic region 73 in which a plurality of rear waist elastic bodies 74 spaced apart in the longitudinal direction Y in the rear waist region 12 are attached in a stretched state so as to be contractible in the lateral direction X, and one rear waist region 12. And a buttock corresponding region 75 formed by the portion of the crotch region 13 on the rear waist region 12 side. The liquid absorption structure 15 includes a pair of leak-proof cuffs that are spaced apart in the lateral direction X and extend in the vertical direction Y. The leak-proof cuff includes a proximal edge portion 52b that is joined to the liquid absorption structure 15 and an absorption line. A distal edge 52a separable from the liquid structure 15, a first cuff elastic body 57a attached to the distal edge 52a so as to be retractable in the longitudinal direction Y, and proximal to the distal edge 52a It has the 2nd cuff elastic body 57b attached to the edge part 52b side so that contraction in the vertical direction Y was carried out in the expansion | extension state. The buttock-corresponding region 75 absorbs the rear edge 12a, 12b of the rear waist region 12 with the central portion in the lateral direction X extending in a curved shape toward the crotch region 13 between the inner ends adjacent to the crotch region. A buttock corresponding elastic body 76 that overlaps the liquid structure 15 in plan view, a buttock elastic portion 77 to which the buttock corresponding elastic body 76 is attached, and the innermost rear waist located on the crotch region 13 side of the rear waist elastic body 74 An elastic body 80, a heel-corresponding elastic body 76, and a buttock cover portion 78 surrounded by the second cuff elastic body 57b, and an elongation stress in a predetermined width of the heel elastic portion 77 and an elastic region of the second cuff elastic body 57b. The elongation stress in the predetermined width is characterized by being lower than the elongation stress in the predetermined width of the elastic region by the innermost rear waist elastic body 80.

The present invention disclosed in the above paragraph 0049 can include at least the following embodiments, and each embodiment is implemented alone or in combination.
(1) The second cuff elastic body 57b is arranged so that the elongation stress is lower than that of the first cuff elastic body 57a.
(2) The liquid absorption structure 15 includes the absorbent core 51, and at least one second cuff elastic body 57 b is disposed in a region where the absorbent core 51 is absent in a plan view.
(3) The hip corresponding elastic body 76 is separated from the innermost rear waist elastic body 80 in the longitudinal direction Y.
(4) The front waist region 11 has a front waist elastic region 71 to which a plurality of front waist elastic bodies 72 are attached in a stretched state so as to be contractible in the lateral direction X, and the crotch region in the front waist elastic region 71 The innermost front waist elastic body 79 located on the 13th side is located closer to the leg opening 24 than the innermost rear waist elastic body 80.
(5) The buttocks-corresponding elastic body 76 includes a straight portion 76a that extends straight in the lateral direction and a pair of inclined portions 76b that extend along the leg opening 24, and the elongation stress of the straight portion 76a is inclined. It arrange | positions so that it may become lower than the elongation stress of the part 76b.
(6) The rear waist region 12 includes a rear outer elastic region 73a located on the waist opening 23 side, a rear inner elastic region 73c located on the crotch region 13 side and including the innermost rear waist elastic body 80, and a rear outer elastic property. A rear intermediate elastic region 73b located between the region 73a and the rear inner elastic region 73c, and the rear waist elastic body 74 has an extension stress of the rear inner elastic region 73c higher than that of the rear intermediate elastic region 73b. Is also arranged to be higher.
(7) The separation distance between the adjacent rear waist elastic bodies 74 in the rear inner elastic region 73c is larger than the separation distance between the adjacent buttocks corresponding elastic bodies 76.
(8) The liquid absorbing structure 15 includes the absorbent core 51, and at least one of the front and rear waist elastic bodies 72 and 74 is formed discontinuously in a region overlapping the absorbent core 51.
(9) The liquid absorbing structure 15 includes the absorbent core 51, and the collar corresponding elastic body 76 is discontinuously formed in a region overlapping the absorbent core 51.

10 Disposable pants-type diapers (pants-type wearing articles)
11 Front waist region 12 Rear waist region 13 Crotch region 14 Chassis 15 Liquid absorbing structure 52a Distal edge 52b Proximal edge 57a First cuff elastic body 57b Second cuff elastic body 71 Front waist elastic area 72 Front waist elastic body 73 rear waist elastic region 74 rear waist elastic body 75 buttocks corresponding region 76 buttocks corresponding elastic body 77 buttocks elastic portion 78 buttocks cover portion 80 innermost rear waist elastic body X lateral direction Y longitudinal direction

Claims (8)

It has a longitudinal direction and a lateral direction, a skin facing surface and a non-skin facing surface located on the opposite side thereof, and defines a front waist region, a rear waist region, and a crotch region located between the front and rear waist regions. A pant-type comprising a chassis, a liquid absorbing structure disposed on the skin facing surface side of the chassis, a waist opening and a pair of leg openings defined by connecting both side edges of the front and rear waist regions In wearing articles,
The chassis has a rear waist elastic region in which a plurality of rear waist elastic bodies spaced apart in the longitudinal direction in the rear waist region are attached to be contractible in the lateral direction in a stretched state, and a part of the rear waist region Having a buttock-corresponding region formed by a portion of the crotch region on the rear waist region side,
The liquid-absorbent structure comprises an absorbent core, and a pair of leak-barrier cuffs extending in the longitudinal direction at a distance from each other in the transverse direction,
The leak-proof cuff includes a proximal edge joined to the liquid absorbing structure, a distal edge separable from the liquid absorbing structure, and contracts in the longitudinal direction in an extended state at the distal edge. A first cuff elastic body that is detachably attached, and a second cuff elastic body that is attached to the proximal edge side from the distal edge portion so as to be contractible in the longitudinal direction in a stretched state.
The buttock corresponding area is formed such that a central part in the lateral direction extends in a curved shape toward the crotch area side between inner end parts adjacent to the crotch area at both side edges of the rear waist area. A buttock-corresponding elastic body that overlaps with the structure in plan view, a heel elastic part to which the buttock-corresponding elastic body is attached, and an innermost rear waist elastic body that is located closest to the crotch region among the rear waist elastic bodies, A buttock corresponding elastic body and a heel cover part surrounded by the second cuff elastic body,
The buttocks elastic part has a straight part extending straight in the lateral direction and a pair of inclined parts located on the outer side in the lateral direction of the absorbent core and extending along the leg opening,
As for the said collar part cover part, the maximum dimension in the said vertical direction is a magnitude | size of 60 to 80% of the dimension in the said vertical direction of the side edge part of the said rear waist area,
The second cuff elastic body is disposed so as to have a lower elongation stress than the first cuff elastic body, and is separated from the innermost rear waist elastic body in the longitudinal direction,
At least one of the second cuff elastic bodies is disposed in a non-existing region of the absorbent core in a plan view,
The extension stress in the predetermined width of the inclined portion and the extension stress in the predetermined width of the elastic region due to the second cuff elastic body are the elasticity of the innermost rear waist elastic body located on the laterally outer side of the absorbent core. The said wearing article characterized by being lower than the elongation stress in the predetermined width | variety of an area | region. The wearing article according to claim 1, wherein the buttocks-corresponding elastic body is separated from the innermost rear waist elastic body in the longitudinal direction. The front waist region has a front waist elastic region in which a plurality of front waist elastic bodies are attached in a stretched state so as to be contractible in the lateral direction,
The wearing article according to claim 1 or 2, wherein the innermost front waist elastic body located closest to the crotch region in the front waist elastic region is positioned closer to the leg opening than the innermost rear waist elastic body. The wearing article according to any one of claims 1 to 3, wherein the collar-corresponding elastic body is arranged such that an extension stress of the straight portion is lower than an extension stress of the inclined portion. The rear waist region includes a rear outer elastic region located on the waist opening side, a rear inner elastic region located on the crotch region side and including the innermost rear waist elastic body, the rear outer elastic region, and the rear A rear intermediate elastic region located between the inner elastic region and
The wearing article according to any one of claims 1 to 4, wherein the rear waist elastic body is arranged such that an extension stress of the rear inner elastic region is higher than an extension stress of the rear intermediate elastic region. The wearing article according to claim 5, wherein a separation distance between adjacent rear waist elastic bodies in the rear inner elastic region is larger than a separation distance between adjacent elastic bodies corresponding to the buttocks. In the region where at least one waist elastic body of the front and rear waist elastic bodies overlaps with the absorbent core in plan view, an inelastic region where the contraction force of the one waist elastic body is not substantially exhibited is defined. The wearing article according to claim 3. The non-elastic area | region where the contractile force of the said hip part corresponding | compatible elastic body is not substantially demonstrated is demarcated in the area | region where the said hip part corresponding elastic body overlaps with the said absorbent core in planar view. Wearing article as described in.