WO2015001914A1

WO2015001914A1 - Underpants-type wearable article

Info

Publication number: WO2015001914A1
Application number: PCT/JP2014/065208
Authority: WO
Inventors: 健島津; 市川　誠; 唯近藤
Original assignee: ユニ・チャーム株式会社
Priority date: 2014-02-21
Filing date: 2014-06-09
Publication date: 2015-01-08
Also published as: CN106029023A; JP2015156899A; TW201534283A; CN106029023B; JP5592578B1; TWI672130B

Abstract

　Provided is an underpants-type wearable article that has leg openings through which legs can easily pass, and that can be provided with a bulge at a buttock-covering part for covering the buttocks.　An underpants-type wearable article (10) has a region (75) corresponding to the buttocks, and a pair of leak-proof cuffs having first cuff elastic bodies (57a) and second cuff elastic bodies (57b). The region corresponding to the buttocks has a buttock-covering part (78) that is surrounded by an innermost rear-waist elastic body (80), elastic bodies (76) corresponding to the buttocks, and the second cuff elastic bodies. The tensile stress at a prescribed width of the elastic bodies corresponding to the buttocks and the tensile stress at a prescribed width of the elastic region due to the second cuff elastic bodies is lower than the tensile stress at a prescribed width of the elastic region due to the innermost rear-waist elastic body.

Description

Pants-type wearing article

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

DESCRIPTION OF RELATED ART Conventionally, the pants-type wearing article provided with the chassis, the liquid absorption structure attached to the skin opposing surface of this chassis, and a pair of leak-barrier cuff is well-known. For example, Patent Document 1 discloses a chassis that defines front and rear waist areas and a crotch area, a liquid absorbing structure attached to the skin-facing surface of the chassis, and a pair of leakage preventing leaks positioned on both sides of the liquid absorbing structure. A pant-type wearing article is disclosed which comprises a cuff and a buttocks-corresponding area formed by a part of the rear waist area and a part of the crotch area on the rear waist side. In this wearing article, a plurality of rear waist elastic bodies extending in the lateral direction are disposed in the rear waist area, and an elastic body corresponding to the buttocks in which the central portion in the lateral direction is curved toward the crotch area is disposed in the buttocks corresponding area. A plurality of elastic cuffs are arranged at the free side edge of the leak-barrier cuff which can be separated from the liquid-absorbent structure. In the area corresponding to the buttocks, on both sides of the liquid absorbent structure, the buttocks cover portion surrounded by the innermost rear waist elastic body positioned on the crotch region side among the post waist elastic bodies and the buttocks corresponding elastic body is formed .

JP, 2013-255777, A

According to the wearing article disclosed in Patent Document 1, the buttocks corresponding elastic body allows the buttocks cover portion to abut against the buttocks of the wearer, and the cuff elasticity disposed at the free side edge of the leak-barrier cuff The leak-barrier cuff can be erected by the body to prevent lateral leakage of body fluid.

However, in the wearing article in Patent Document 1, although the buttocks cover portion can be made to follow the buttocks of the wearer, the buttocks cover portion can not be covered so as to cover the buttocks with swelling. In particular, since the plurality of elastic cuffs are disposed only on the free side edge of the leak-barrier cuff and do not act on the buttocks cover, the inner portion of the buttocks cover adjacent to the liquid suction structure is flat It does not form a three-dimensional shape. Moreover, in the wearing article in Patent Document 1, the separation distance of the buttocks corresponding elastic body is narrower than the separation distance of the rear waist elastic body, and the extension stress in the predetermined width of the buttock elastic portion is the elastic region by the innermost rear waist elastic body. The leg opening is narrowed because it is higher than the tensile stress at the predetermined width of the leg, making it difficult to pass the foot.

Therefore, an object of the present invention is an improvement of the prior art, in which it is easy to pass the foot through the leg opening at the time of wearing, and wearing the pants type which can form the buttocks cover three-dimensionally to cover the buttocks It is in the provision of goods.

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

In the present invention, the chassis is provided with a rear waist elastic area and a rear waist area in which the plurality of rear elastic waist bodies spaced apart in the longitudinal direction are attached to be contractible in the lateral direction in the rear waist area. And a portion corresponding to the rear waist region of the crotch region, and the liquid-absorbent structure includes a pair of longitudinally-extending pair-wise Includes leaked cuffs. The leak-barrier cuff shrinks in the longitudinal direction in a stretched state at a proximal edge joined to the liquid-absorbent structure, a distal edge which can be separated from the liquid-absorbent structure, and the distal edge And a second cuff elastic body attached to be able to contract in the longitudinal direction so as to extend from the distal edge to the proximal edge side. The second cuff elastic body is disposed to have a lower extension stress than the first cuff elastic body. In the buttocks corresponding area, the central portion in the lateral direction extends in a curved shape toward the crotch area between the inner ends adjacent to the crotch area of the both side edges of the rear waist area, and the liquid absorption A buttocks corresponding elastic body overlapping in a plan view with the structure, a buttocks elastic portion to which the buttocks corresponding elastic body is attached, and an innermost rear waist elastic body positioned on the crotch region side of the after waist elastics, It has a buttocks corresponding elastic body and a buttocks cover part surrounded by the second cuff elastic body. The elongation stress at a predetermined width of the buttock elastic portion and the elongation stress at a predetermined width of the elastic area by the second cuff elastic body are lower than the elongation stress at a predetermined width of the elastic area by the innermost rear waist elastic body I assume.

According to one or more embodiments of the pants-type wearing article according to the present invention, the second cuff elastic body is disposed on the proximal edge side from the distal edge of the leak-barrier cuff, and the buttocks cover portion is Since it is surrounded by the innermost rear waist elastic body, the buttocks corresponding elastic body and the second cuff elastic body, the buttocks cover portion can be formed three-dimensionally by contracting the inner portion of the buttocks cover portion. In addition, since the stretching stress at the predetermined width of the buttocks elastic portion and the stretching stress at the predetermined width of the elastic area by the second cuff elastic body are lower than the stretching stress at the predetermined width of the elastic area by the innermost rear waist elastic body, It is possible to flexibly cover the buttocks so as not to tighten tightly while holding the waist circumference stably. Further, since the extension stress at the predetermined width of the buttocks elastic portion is lower than the extension stress at 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 present invention according to the present disclosure and include not only the essential features of the invention, but also optional and preferred embodiments.
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 the present disclosure. The partially broken development top view of the diaper extended longitudinally and laterally to the time of maximum expansion of each elastic body (The extent to which the gather by the contraction effect of an elastic member is lose | eliminated). The partially broken exploded perspective view of a diaper. FIG. 4 is a schematic cross-sectional view taken along the line IV-IV in FIG. Top view of the 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 side of the back in the wearing state of a diaper. (B): A schematic cross-sectional view taken 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 the 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 the essential configuration of the invention but also selective and preferable configurations. In FIG. 2, each elastic body to be described later is substantially produced by gathers generated in a member to which each elastic body is attached due to natural contraction by the contraction force in the transverse direction X and the longitudinal direction Y against the contraction force. It has been stretched to the extent that it appears to be lost.

1 to 3, a disposable pants-type diaper 10, which is an example of a pants-type wearing article according to the present invention, has a longitudinal direction Y and a transverse direction X orthogonal to one another, It has a skin facing surface, a vertical axis P which bisects the length dimension of the longitudinal direction Y, and a horizontal axis Q which bisects the length dimension of the horizontal direction X, and is substantially symmetrical with respect to the vertical axis P And a front waist region 11, a rear waist region 12, and a crotch region 13 located between the front waist region 11 and the rear waist region 12.

The diaper 10 further includes a chassis 14 in the form of a base, and a liquid-absorbent structure 15 located on the skin-facing surface of the chassis 14 and extending in the longitudinal direction Y about the crotch area 13. In the chassis 14, both side edges defining the crotch area 13 have a concave shape, and the narrowest part of the crotch area 13 is offset to the front waist area 11 side with respect to the transverse axis Q. 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 edges in which the side edges opposite to each other in the longitudinal direction of the diaper 10 extend intermittently in the longitudinal direction Y Connected by the seam 22 defines a waist opening 23 and a pair of leg openings 24. The side seams 22 fuse together the overlapping sheets by known means such as, for example, thermal or ultrasonic embossing / debossing.

The chassis 14 is located on the skin-facing surface, and a base sheet 25 made of, for example, a non-woven fabric which defines the front and

rear waist areas

11 and 12 and the crotch area 13 in series. It further includes a front waist sheet 26 and a rear waist sheet 27 opposite to each other and made of, for example, a non-woven fabric.

<Base sheet>
The base sheet 25 has first and

second end edges

25a, 25b spaced apart in the longitudinal direction Y, and

opposite side edges

25c, 25d spaced apart in the lateral direction X. Both

side edges

25c and 25d are straight portions in the front and

rear waist regions

11 and 12 and a curved portion in the crotch region 13 that is convexly curved deeper toward the front waist region 11 from the rear waist region 12 side toward the vertical axis P It is formed.

<Front waist seat>
The front waist sheet 26 has a substantially trapezoidal shape forming the front waist region 11 and a part of the crotch region 13 and extends in the longitudinal direction Y with the middle inner end edge 26 a and the outer end edge 26 b extending in the lateral direction X. It is formed of both

outer edges

26c, 26d and both

inner edges

26e, 26f connecting the

outer edges

26c, 26d and the middle inner edge 26a. The both

inner end edges

26e, 26f have a straight portion extending straight in the lateral direction X from the

outer edges

26c, 26d, and a curved portion extending from the straight portion to the middle inner end 26a. The front waist sheet 26 has a rectangular main body 29 extending in the lateral direction X between the

outer edges

26c and 26d, and is narrower than the main body 29 and extends between the two

inner edges

26e and 26f. And an outlet 30. The main body portion 29 has a bent portion 33 which is bent inward along the waist opening edge. The bent portion 33 is bent inward along the first edge 25 a of the base sheet 25 in a state where the liquid absorbent structure 15 is disposed on the inner surface of the base sheet 25, and the base sheet 25 and the liquid absorbent structure 15 are It is fixed on the skin facing side of

<Rear waist seat>
The rear waist sheet 27 has a substantially trapezoidal shape that forms the rear waist area 12 and a part of the crotch area 13, and extends from the middle inner edge 27a and the outer edge 27b extending in the lateral direction X, and the outer edge 27b. It is formed of both

outer edges

27c, 27d extending in the longitudinal direction Y, and both

inner edges

27e, 27f connecting the

outer edges

27c, 27d and the inner edge 27a in a curved shape. The rear waist sheet 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 substantially located between the two

inner end edges

27e and 27f. And a trapezoidal extending portion 35. The main portion 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 edge 25 b of the base sheet 25 in a state where the liquid absorbent structure 15 is disposed on the inner surface of the base sheet 25, and the base sheet 25 and the liquid absorbent structure 15 are It is fixed on the skin facing side of

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 in an expandable state so as to be contractible. 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 portion 34, and a collar portion corresponding elastic body 76 extending in a curved shape from the main portion 34 to the extension portion 35 Is attached retractably in the extended state. The front and

rear waist regions

11 and 12 have the elastic elastic stretchable front and rear waist

elastic regions

71 and 73 and a buttocks elastic portion 77 described later by arranging the respective elastic members.

The base sheet 25 and the front and

rear waist sheets

26 and 27 have a weight 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. An SMS (spunbond, meltblown, spunbond) fiber non-woven fabric, an air through fiber non-woven fabric, a moisture-permeable plastic sheet, or a laminate sheet thereof can be used. In the present embodiment, the base sheet 25 is, for example, an SMS fiber non-woven fabric having a mass of about 10 to 18 g / m ² , preferably 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 non-woven fabric having a weight of about 20 g / m ² can be used.

Further, in the present embodiment, the outer surface of the front and

rear waist sheets

26 and 27 is optionally subjected to a grid-like embossing / debossing process, and an embossed / debossed pattern 28 with irregularities is disposed. The embossing / debossed pattern 28 is not limited to a lattice-like pattern, and may be formed into another pattern such as a circular shape. By embossing / debossing the outer surfaces of the front and

rear waist sheets

26 and 27, the flexibility of the sheet can be improved, the touch can be improved, and the appearance like underwear can be obtained. Further, in the present embodiment, the central portion 13C of the crotch region 13 is formed only of the base sheet 25. However, the central portion 13C may be formed of an appropriate sheet such as a plurality of fibrous non-woven fabrics. However, when the central portion 13C of the crotch region 13 is formed of a single-layer sheet, the central portion 13C is superior in flexibility as compared to the case where it is formed of a plurality of layers. When sandwiched between the thighs, it becomes more likely to deform along the shape of the body. In addition, by forming a part of the chassis 14 with a single-layer sheet, the manufacturing cost can be reduced.

Regarding the dimensions of the diaper 10 (the same as the corresponding dimensions 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 transverse direction X is about 400 to 800 mm, and the front waist region 11 The dimension L2 in the longitudinal direction Y of the front

side edge portions

11a and 11b (the same as the dimension in the longitudinal direction Y of the rear

side edge portions

12a and 12b of the rear waist region 12) is preferably about 80 to 150 mm.

<Liquid-absorbent structure>
Referring to FIGS. 2 and 3, the liquid absorbent structure 15 has a front end 15A, a rear end 15B, and a central portion 15C located between the front and

rear ends

15A and 15B. The liquid absorbing structure 15 is located on the skin facing surface side, and for example, a body side liner 50 made of a liquid non-woven fibrous non-woven fabric, a liquid absorbing absorbent body 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 may be, for example, a core material formed of 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 and diffusion such as tissue paper encapsulating the whole core material. And a core wrap sheet of sex. The body side liner 50, the barrier cuff sheet 52 and the leakproof back sheet 53 form end flaps 56a and 56b extending in the longitudinal direction Y from the front end edge 51a and the rear end edge 51b of the absorber 51, respectively. The liquid-absorbent structure 15 and the chassis 14 (base sheet 25) are formed of a bonding area 60 formed of a known bonding means such as a hot melt adhesive applied in a suitable pattern on at least one of the opposing surfaces thereof. It is joined to each other. In the present embodiment, the bonding area 60 is composed of a plurality of bonding sites separated in the longitudinal direction Y, but may be a continuous bonding area so as to bond the entire back surface of the liquid absorbent structure 15 .

Referring to FIG. 2, the pair of barrier cuff sheets 52 is elongated in the longitudinal direction Y, is folded in two and has the inner surfaces fixed to one another, and is fixed to the skin facing surface of the body side liner 50. It has opposite front and rear fixed parts separated in the direction Y, a proximal edge 52b extending in the longitudinal direction Y, and a distal edge 52a located inward in the lateral direction X from the proximal edge 52b. A first cuff elastic body 57a extending in the longitudinal direction Y in the distal edge 52a of the barrier cuff sheet 52, 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 outside in the lateral direction X so as to be contractible in an extended state. The contraction of the first cuff elastic body 57a separates the distal edge 52a from the body side liner 50 toward the body of the wearer, and forms a pair of leakproof cuffs for preventing lateral leakage of body fluid. . The leak-proof back sheet 53 is formed of, for example, a liquid-impervious fibrous non-woven fabric, a liquid-impervious and moisture-permeable plastic film, or a laminate sheet thereof, so as to cover at least almost the entire lower surface of the absorber 51. It is arrange | positioned and prevents that a bodily fluid leaks out from the non-skin opposing surface (bottom face) side of the liquid absorption structure 15. As shown in 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 disposed such that the elongation stress of the second cuff elastic body 57b is lower than the elongation stress of the first cuff elastic body 57a by appropriately setting the material, the fineness, and the elongation 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 has the first cuff elastic body 57a and The same material is composed of two elastic materials having a fineness of 470 dtex and a stretching ratio of about 2.7 times. The first cuff elastic body 57a is disposed so that at least a part thereof overlaps the region where the absorber 51 exists in a plan view (Z direction), and at least one elastic body of the second cuff elastic body 57b The outermost cuff elastic body 58) is disposed so as not to overlap the absorber 51 in plan view.

<Front and rear 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 lateral direction X on the crotch region 13 side, and And 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 lateral direction X on the crotch region 13 side, and rear outer and rear inner

elastic regions

73a, 73c. And an intermediate elastic region 73b located therebetween.

<Each elastic body>
The front waist elastic body 72 is formed, for example, of a string-like or strand-like elastic material having a fineness of about 450 to 1240 dtex and being 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 located in the front outer elastic area 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. Are spaced apart. The front waist elastic body 72 located in the front intermediate elastic region 71b is positioned to overlap the end flap 56a of the liquid absorbent structure 15 in plan view, and, for example, a plurality of fibers having a fineness of 470 dtex and an extension magnification of about 2.3 times It consists of elastic material of a strip, and is mutually spaced apart about 10 mm 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 elongation ratio of about 2.5 And are spaced apart from each other by about 7.5 mm in the longitudinal direction Y.

The rear 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 being stretched about 1.5 to 3.5 times from a contracted or relaxed state, for example. be able to. In the present embodiment, the rear waist elastic body 74 located in the rear outer elastic area 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 separated 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 disposed in a region where at least one elastic body overlaps the end flap 56b of the liquid absorbent structure 15, and has a fineness of 780 dtex and an extension ratio of about 2.1. It consists of double elastic material, and is arranged at intervals of 7 mm in the longitudinal direction Y. The rear waist elastic body 74 located in the rear inner elastic region 73c is, for example, made of a plurality of elastic materials having a fineness of 780 dtex and an expansion ratio of 2.5 times, and is spaced apart in the longitudinal direction Y by 15 mm. .

By appropriately setting the material, fineness, extension ratio, and separation distance of the elastic body in each rear waist

elastic area

73a, 73b, 73c, the expansion stress of the rear inner elastic area 73c is higher than the expansion stress of the rear middle elastic area 73b. It is preferable to do. Specifically, the extensional stress at 171% elongation (a size of 171% when the size of the natural state is 100%) in the predetermined width (30 mm width) of the portion of the absorber 51 in the lateral direction X is The middle elastic zone 73b is about 2.0 to 6.0 N, and the back inner elastic zone 73c is about 3.0 to 8.0 N. The correlation of the extension stress is as follows: back inner elastic area 73c> back outer elastic area 73a It is 後 back middle elastic region 73b. Thus, the waist opening edge can be stably held around the waist of the wearer by setting the extension stress of the elastic area 73a on the waist opening 23 side higher than the other

elastic areas

73b and 73c. Further, 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 toe is inserted from the waist opening 23 at the time of wearing, the inside of the waist opening is relatively The circumferential dimension is increased to facilitate insertion of the foot towards the leg opening 24. In order to exhibit such an effect more, the correlation of the extension stress in the front waist elastic area 71 is the same as the correlation of the rear waist elastic area 73, the front outer elastic area 71a 前 front inner elastic area 71 c> front intermediate elasticity It is preferable that it is the area 71b.

<Crest area>
Referring to FIG. 5, the chassis 14 has a buttock correspondence area 75 extending from the rear inner elastic area 73c to a part of the crotch area 13, specifically to the middle inner edge 27a of the rear waist sheet 27 in the crotch area 13. . The buttocks corresponding area 75 has a buttocks elastic portion 77 to which a plurality of buttocks corresponding elastic bodies 76 extending in a curved shape so as to be convex toward the horizontal axis Q can be contracted in an extended state. The buttocks elastic portion 77 has a straight portion 76a which extends in the lateral direction X along the vicinity of the middle inner end edge 27a of the rear waist sheet 27 and the buttocks, and the buttocks corresponding elastic body 76 overlaps the liquid absorbent structure 15. The corresponding elastic body 76 does not overlap with the liquid absorbent structure 15, and has inclined portions 76b located on both sides of the straight portion 76a.

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

The dimension of the longitudinal direction Y of each elastic region in the front and

rear waist regions

11 and 12 can be divided so as to be a predetermined ratio as long as the effects of the present invention are exhibited. For example, the size in the longitudinal direction Y of the front and rear intermediate

elastic zones

71b, 73b and the front and rear inner

elastic zones

71c, 73c is 1.0 to 2.5 times the size in the longitudinal direction Y of the front and rear outer

elastic zones

71a, 73a. The dimensions can be set to be smaller or the dimensions in the longitudinal direction Y of each elastic region can be divided equally. It is preferable that the dimension of the longitudinal direction Y of the front and back outer side

elastic area

71a, 73a is set equally.

Further, in the rear waist region 12, the buttocks-corresponding elastic body 76 is positioned in the vicinity of the inner end of the rear

side edge portions

12a and 12b, whereby the innermost rear side of the rear waist elastics 74 located closest to the crotch region 13 side. The waist elastic body 80 is separated by a given dimension from the inner end portion 83 of the rear side edge portion 12a, and the separation dimension R2 in the longitudinal direction Y of them is located closest to the crotch region 13 among the front waist elastic bodies 72. The separation dimension R1 in the longitudinal direction Y between the innermost front waist elastic body 79 and the inner end portion 82 of the

front edge portions

11a and 11b of the front waist region 11 is larger than the separation dimension R1. 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 width dimension (the dimension in the longitudinal direction Y) of the front waist elastic region 71 is relatively set by the innermost front waist elastic body 79 being positioned closer to the leg opening 24 than the innermost rear waist elastic body 80. It becomes larger than the width dimension of the rear waist elastic region 73, extends in a band along the abdomen of the wearer projecting forward, and is stably fitted. Further, at the leg opening edge, the front side shrinks and the shape of the leg opening 24 deforms so as to be convex forward, so that it is possible to suppress the hook opening edge from being caught when inserting the toe .

6 is a partially enlarged plan view of the region surrounded by the alternate long and short dash line VI in FIG. 2, and FIG. 7 is a perspective view as viewed from the back side in the wearing state of the diaper 10. Although FIGS. 6 and 7 describe only the buttocks cover portion 78 located on one side in the lateral direction X of the absorber 51, the buttocks cover portion 78 located on the other side also has the same configuration. FIG. 7 shows a reference view for clarifying the aspect of the buttocks cover portion 78 in the worn state.

Referring to FIGS. 6 and 7, elastic members 76 corresponding to buttocks, innermost rear waist elastic members 80 and second cuff elastic members 57b on both sides of absorber 51 in buttocks corresponding region 75 or those elastic members The buttocks cover part 78 enclosed by each elastic area which the contraction force of each elastic body acts on is formed. The buttocks cover portion 78 is positioned opposite to the buttocks portion 81 of the wearer in the worn state, and the entire area formed of the flexible sheet member is bulged outward because it is surrounded by the respective elastic members. It takes a form like this. Here, in a normal disposable wearing article, the central portion 13C of the crotch area 13 is drawn to the buttocks by the movement of the wearer during wearing or the like, or a part thereof is caught in the beard clefts. The part may be exposed to the outside. In particular, in a so-called three-piece 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 the exposed buttocks for preventing it It is known. However, such a buttock sheet is for covering a buttock that is already exposed to the outside, and is not for preventing the buttock itself from being exposed.

Referring to FIG. 7 (b), in the present embodiment, the buttocks cover 78 has a form that bulges outward so as to cover the entire buttocks 81, so it is possible to move it by the movement of the wearer. Even if the buttocks-corresponding elastic body 76 and / or the second cuff elastic body 57b defining the upper and lower cuffs are drawn toward the central portion 13C of the crotch area 13, they are drawn as shown by the phantom lines in FIG. Since the portion which bulges outward by an amount is extended and fitted to the heel portion 81, there is no possibility that the rear leg opening edge enters the width and the heel portion 81 is exposed. Therefore, it is possible to prevent discomfort and leakage of excrement due to exposure of the buttocks 81 from the diaper 10. In particular, in the diaper 10 according to this embodiment, since the central portion 13C of the crotch region 13 is formed of a single-layer sheet, the crotch region of the wearer is sandwiched and deformed, whereby the buttocks-corresponding elastic body 76 is It is easy to be pulled downward, and such an effect can be exhibited.

Moreover, in the region where the absorbent body 51 is present, in general, the diaper may be formed to be outwardly bulged and it may be easily recognized as a diaper in appearance, in the present embodiment, When the buttocks cover part 78 which consists of a flexible sheet member takes on the form which bulges outward, the whole back of a diaper can be swelled and can give an impression like soft underwear. In particular, in the present embodiment, since the outer surfaces of the front and

rear waist sheets

26 and 27 are embossed / debossed to further improve the flexibility, they are easy to expand outward and give a soft impression, It is possible to have an undergarment-like appearance by the / debossed pattern 28.

In each elastic region forming the buttocks cover portion 78, the extension stress in the predetermined width of the buttocks elastic portion 77 and the extension stress in the predetermined width of the elastic region by the second cuff elastic body 57b It is set lower than the extension stress in a predetermined width of the back inner elastic area 73 c including the innermost back waist elastic body 80 located on the 13 side. Specifically, in each of the rear waist

elastic regions

73a, 73b, 73c, when 171% of the predetermined width (30 mm width) of the portion of the absorber 51 in the lateral direction X outside is expanded (the size in the natural state is 100%) Of the back inner elastic region 73c is about 3.0 to 8.0 N, the hip elastic part 77 is about 0.5 to 5.0 N, and the second cuff elastic body 57b of the leakproof cuff The 171% elongation at the predetermined width of the elastic range by the above is about 1.0 to 5.0 N, and the correlation of the extension stress is as follows: elastic range by the back inner elastic range 73c> second cuff elastic body 57b 臀 collar portion elastic part It is 77.

In order to expand the buttocks cover portion 78 so as to wrap the buttocks softly and to prevent the buttocks from being tightly tightened, the extensional stress of each elastic region defining it is set to be relatively low. Although it is preferable, it is preferable to have the required elongation stress in the area | region which hold | maintains a waist part of a wearer stably (hold). In the present invention, the extension stress of each elastic region is in the above-mentioned correlation, and the back inner side contacting with the area where the waist of the wearer is held, in particular, the site where the ilium to be held most stably is located. While the elastic region 73c has a required elongation stress to effectively prevent the diaper from slipping down in the worn state, the elongation stress in the other elastic regions is set lower than that, so that the tightening is caused by tightening. There is no risk of discomfort.

Further, since the inclined portion 76b of the buttocks corresponding elastic body 76 has a curved shape, it can expand and contract in the lateral direction X and the longitudinal direction Y (or all directions). Therefore, as compared with the case where the buttocks corresponding elastic body 76 extends straight in the lateral direction X, when it is pulled downward and the buttocks cover portion 78 becomes flat, the buttocks cover portion 78 is worn. It can be extended in four directions to fit the body according to the shape of the buttocks of the person. Further, as an assumed function of the buttocks cover portion 78, for example, the second cuff elastic body 57b defining the buttocks cover portion 78 expands and contracts in conjunction with the movement of the absorber 51 by the movement of the wearer, or the buttocks corresponding When the elastic body 76 expands and contracts, the buttocks cover portion 78 repeatedly contracts and expands, and at that time, external air enters the buttocks cover portion 78 from the gathers (leg gathers) formed by the buttocks corresponding elastic body 76, By leaving it out, a pump function that prevents the stuffiness in the diaper 10 can be considered.

The second cuff elastic body 57b has a lower extension stress than the first cuff elastic body 57a. The second cuff elastic body 57b forms a virtual elastic band surrounding the leg opening edge by the front waist elastic body 72 intersecting with it and the hip portion corresponding elastic body 76, a portion extending rearward from the hip portion corresponding elastic body 76 Functions to assist the erection of the leak-barrier cuff and does not require a relatively high tensile stress. Therefore, while the first cuff elastic body 57a has a relatively high elongation stress for causing the distal edge 52a of the leak-barrier cuff to stand up and exert a sufficient leak-proof function, the second cuff elastic body 57b has a buttock It is sufficient for the cover 78 to have a relatively low tensile stress to form the cover 78, and the tensile stress of the entire leak-barrier cuff is too high to suppress the body from being tightened. Further, among the second cuff elastic bodies 57 b, the outermost cuff elastic body 58 located on the outermost side in a plan view is disposed in the non-existing area of the absorber 51, and therefore, against the rigidity of the absorber 51. Since it does not shrink, even with a relatively low elongation stress, the base sheet 25 and the rear waist sheet 27 can be shrunk to such an extent that the buttocks cover portion 78 can be formed.

In order for the buttocks cover 78 to expand outward to cover the entire buttocks, the surface area of the entire buttocks cover 78 needs to be relatively large. Since the dimension of the longitudinal direction Y of the buttocks cover portion 78 is larger than that of other commonly used diapers, it has a relatively large surface area. Specifically, the dimension in the maximum longitudinal direction Y of the buttocks cover 78 (the distance between the innermost rear waist elastic body 80 and the straight portion 76a of the buttocks corresponding elastic body 76; see FIG. 6) L3 is the rear waist It has a size of about 60 to 80% of the dimension L2 in the longitudinal direction Y of the rear edge 12b, 12c of the area 12.

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 in the longitudinal direction Y and intersect each other in plan view Not. By not crossing these elastic bodies, the hip joint elastic body 76 is not directly affected by the contraction action of the rear waist elastic body 74 in the direction around the waist, so the leg opening edge is contracted by its own contraction action. While fitting the part to the body, the curved shape can form a convexly convex buttock cover part 78. In order to exhibit such an effect, the separation dimension R3 in the longitudinal direction Y between the innermost rear waist elastic body 80 and the buttocks corresponding elastic body 76 at the rear

side edge portions

12a and 12b is preferably about 100 to 180 mm. If 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 if the separation dimension R3 exceeds about 200 mm, the inclined portion 76b and the elastic body 80 And the inelastic area located between the two may be large, which may reduce the fit of the wearer's waist.

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 area including the innermost rear waist elastic body 80 forms a wide elastic band which can be stably fitted around the waist of the wearer by relatively increasing the distance between the elastic bodies. On the other hand, by making the width dimension of the buttock elastic portion 77 relatively small, the buttock elastic portion 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, showing the absorber 51 by imaginary lines. The diaper 10 according to the present embodiment has the same basic configuration as that of the first embodiment, so only the differences will be described below.

In the present embodiment, the inelastic area 91 where the contraction force of the front waist elastic body 72 is not substantially exerted is defined in the area where the front waist elastic area 71 overlaps the absorber 51 in plan view, and similarly In the region of the rear waist elastic region 73 and the buttocks elastic portion 77 overlapping with the absorber 51 in plan view, the

inelastic regions

92 and 93 in which the contraction force of each

elastic body

74 and 76 is not substantially exerted are defined. It is done. By defining the inelastic regions 91 to 93, the contraction force of the

elastic members

72, 74, 76 causes deformation such that leakage of the absorbed body fluid is caused by acting directly on the absorber 51. Can be suppressed. In order to exert such an effect, it is sufficient if at least one of the inelastic regions 91 to 93 is defined, and the elastic region other than the elastic region in which the inelastic region is formed in the portion overlapping the absorber 51 is It may extend continuously in the lateral direction X as in one embodiment. Each inelastic region 91 to 93 can be formed by various methods known in the field of this kind, and for example, each elastic body is unbonded in the region and cut to cut back (so-called snapback). Alternatively, it can be formed by removing the elastic body in the region or performing an elastic deterioration treatment.

<Method of measuring elongation stress>
Using the tensile tester manufactured by Instron Japan Co., Ltd. (INSTRON model: 5564) and setting the tensile speed to 100 mm / min, the elongation stress of each elastic area of the front and rear waist

elastic area

71, 73 is set as follows using the following method It measured by. In each elastic region, for a portion that does not overlap with the absorber, cut a test strip with a length of 30 to 50 mm in the lateral direction X from that portion, and for the specimen in the natural state, the separation dimension in the lateral direction X is A pair of 20 mm marked lines are drawn, and the extension force of each sample when it is extended until its separation dimension becomes 1.7 times is determined and compared. In addition, when the dimension of the vertical direction Y of the diapar 10 which is the width dimension in each sample is not constant, it is each according to the extension stress when the extension force about each sample is converted into the value in the case of 30 mm in width. Compare the samples. The elastic regions of the sloped portion 76b of the buttocks elastic portion 77 and the second cuff elastic body 57b of the leak-barrier cuff were also measured in the same manner. In the case of the buttocks elastic portion 77, a test piece having a width of 30 mm is cut out and measured along the inclined portion 76b of the buttocks corresponding elastic body 76, and in the elastic region by the second cuff elastic body 57b, the test piece along the longitudinal direction Y Was cut and measured.

In addition to the materials described in the specification, various known materials commonly used in this type of article may be used without limitation for each component constituting the disposable pants-type diaper 10 of the present invention. Can. Also, in the specification and claims, the terms "first" and "second" are used merely to distinguish similar elements, locations, and the like.

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

The pants-type worn article 10 has a longitudinal direction Y and a lateral direction X, a skin opposing surface and a non-skin opposing surface located on the opposite side, and includes a front waist region 11, a rear waist region 12, and a front and rear waist A chassis 14 defining a crotch region 13 positioned between the

regions

11 and 12, a liquid absorbing structure 15 disposed on the skin facing surface side of the chassis 14, and both side edges 11a of the front and

rear waist regions

11 and 12, A waist opening 23 and a pair of leg openings 24 defined by connecting 12a, 11b and 12b are included. The chassis 14 has a rear waist elastic region 73 and a rear waist region 12, in which a plurality of rear elastic waist bodies 74 spaced apart in the longitudinal direction Y in the rear waist region 12 are retractably attached in the lateral direction X in an extended state. It has a buttocks corresponding area 75 formed by the part and the part on the rear waist area 12 side of the crotch area 13. The absorbent structure 15 includes a pair of leak-barrier cuffs spaced apart in the lateral direction X and extending in the longitudinal direction Y, and the leak-barrier cuff includes a proximal edge 52 b joined to the liquid-absorbent structure 15, and A distal edge 52a separable from the fluid structure 15, a first elastic cuff 57a attached in the longitudinal direction in the longitudinal direction in a longitudinal Y direction so as to be contractible in the longitudinal direction, and a proximal end of the distal edge 52a The second cuff elastic body 57b is attached to the edge 52b side so as to be contractible in the longitudinal direction Y in a stretched state. The buttocks-corresponding area 75 extends in a curved shape toward the crotch area 13 at the central portion in the lateral direction X between the inner end parts of the

rear edge parts

12a and 12b of the rear waist area 12 adjacent to the crotch area. An innermost rear waist located on the crotch region 13 side of the rear waist elastics 74, the hips corresponding elastics 76 overlapping the liquid structure 15 in plan view, the hips elastics 77 to which the ridges corresponding elastics 76 are attached, and The elastic body 80, the elastic part 76 corresponding to the buttocks, and the buttocks cover 78 surrounded by the second cuff elastic body 57b, and the stretching stress at a predetermined width of the buttocks elastic section 77 and the elastic region by the second cuff elastic body 57b The elongation stress at the predetermined width is lower than the elongation stress at 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 practiced alone or in combination.
(1) The second cuff elastic body 57b is disposed so that the extension stress is lower than that of the first cuff elastic body 57a.
(2) The liquid absorbent structure 15 includes the absorbent core 51, and at least one second cuff elastic body 57b is disposed in the absence area of the absorbent core 51 in a plan view.
(3) The buttocks 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 the front waist elastic region 71 attached so as to be contractible in the lateral direction X in a stretched state, and the crotch region of the front waist elastic region 71 The innermost front waist elastic body 79 located on the 13 side is located closer to the leg opening 24 than the innermost rear waist elastic body 80.
(5) The collar portion corresponding elastic body 76 has a straight portion 76a extending linearly in the lateral direction, and a pair of inclined portions 76b extending along the leg opening 24, and the extension stress of the linear portion 76a is inclined It is arrange | positioned so that it may become lower than the extension stress of the part 76b.
(6) The rear waist region 12 is located at the waist opening 23 side, and the rear inner elastic region 73c including the innermost rear waist elastic body 80 located at the crotch region 13 side and the rear outer elastic region 73c. The rear waist elastic body 74 has a rear intermediate elastic area 73b located between the rear area 73a and the rear inner elastic area 73c, and the elastic modulus of the rear inner elastic area 73c is greater than that of the rear intermediate elastic area 73b. Are also arranged to be high.
(7) The separation distance between the adjacent rear waist elastic members 74 in the rear inner elastic region 73c is larger than the separation distance between the adjacent buttocks corresponding elastic members 76.
(8) The liquid absorbing structure 15 includes the absorbent core 51, and at least one of the front and rear waist elastics 72 and 74 is discontinuously formed in the region overlapping the absorbent core 51.
(9) The liquid absorbent structure 15 includes the absorbent core 51, and the buttocks corresponding elastic body 76 is discontinuously formed in the region overlapping the absorbent core 51.

10 disposable pants-type diapers (pants-type wearing articles)
11 front waist area 12 back waist area 13 crotch area 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 back waist elastic area 74 back waist elastic body 75 buttocks corresponding area 76 buttocks elastic body 77 buttocks elastic section 78 buttocks cover 80 innermost back waist elastic body X horizontal direction Y longitudinal direction

Claims

It has a longitudinal direction and a lateral direction, and a skin opposing surface and a non-skin opposing surface located on the opposite side, and defines a front waist region, a rear waist region, and a crotch region located between the front and back waist regions. A pants type including a chassis, a liquid absorbing structure disposed on the skin-facing surface side of the chassis, and a waist opening and a pair of leg openings defined by connecting both side edges of the front and rear waist regions. In the wearing item,
In the rear waist region, the chassis is attached to the rear elastic region in the horizontal direction so as to be contractible in the lateral direction in a stretched state, and a part of the rear waist region. And a buttocks corresponding area formed by the part on the rear waist side of the crotch area,
The liquid absorbing structure includes a pair of leak-barrier cuffs which are spaced apart in the lateral direction and extend in the longitudinal direction,
The leak-barrier cuff shrinks in the longitudinal direction in a stretched state at a proximal edge joined to the liquid-absorbent structure, a distal edge which can be separated from the liquid-absorbent structure, and the distal edge And a second cuff elastic body attached to the longitudinal direction so as to be contractible in a stretched state in a state of being extended to the proximal edge side from the distal edge.
In the buttocks corresponding area, the central portion in the lateral direction extends in a curved shape toward the crotch area between the inner ends adjacent to the crotch area of the both side edges of the rear waist area, and the liquid absorption A buttocks corresponding elastic body overlapping in a plan view with the structure, a buttocks elastic portion to which the buttocks corresponding elastic body is attached, and an innermost rear waist elastic body positioned on the crotch region side of the after waist elastics, And a buttocks covering elastic portion surrounded by the buttocks corresponding elastic body and the second cuff elastic body,
The elongation stress at a predetermined width of the buttock elastic portion and the elongation stress at a predetermined width of the elastic area by the second cuff elastic body are lower than the elongation stress at a predetermined width of the elastic area by the innermost rear waist elastic body The said wearing article to be.
The wearing article according to claim 1, wherein the second cuff elastic body is disposed so as to have a lower extension stress than the first cuff elastic body.
The absorbent structure includes an absorbent core,
The wearing article according to claim 1 or 2, wherein at least one of the second cuff elastic bodies is disposed in the absence area of the absorbent core in a plan view.
The wearing article according to any one of claims 1 to 3, 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 to the lateral direction so as to be contractible in an extended state;
The innermost front waist elastic body located on the crotch region side in the front waist elastic region is located on the leg opening side with respect to the innermost rear waist elastic body. Wearing items.
The buttocks-corresponding elastic body includes a straight portion linearly extending in the lateral direction, and a pair of inclined portions extending along the leg opening, and an extension stress of the linear portion is an elongation of the inclined portion. The wearing article according to any one of claims 1 to 5, which is arranged to be lower than the stress.
The rear waist region is a rear outer elastic region located on the waist opening side, a rear inner elastic region including the innermost rear waist elastic body located on the crotch region side, and the rear outer elastic region and the rear A rear intermediate elastic zone located between the inner elastic zone and
The wear article according to any one of claims 1 to 6, wherein the rear waist elastic body is disposed such that the extension stress of the back inner elastic region is higher than the extension stress of the rear middle elastic region.
The wearing article according to claim 7, wherein the separation distance between the adjacent rear waist elastics in the rear inner elastic region is larger than the separation distance between the adjacent buttocks corresponding elastic members.
The absorbent structure includes an absorbent core,
The wearing article according to claim 5, wherein at least one of the front and rear waist elastics is discontinuously formed in a region overlapping with the absorbent core.
The absorbent structure includes an absorbent core,
The wearing article according to any one of claims 1 to 9, wherein the buttocks corresponding elastic body is discontinuously formed in a region overlapping with the absorbent core.