JP4996524B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper having a stool separation wall surrounding a stool dropping region on the surface of a top sheet in addition to an absorbent body, a top sheet, and a back sheet.

  In recent years, as a diaper for infants or the elderly / handicapped, an absorbent body, a top sheet at least partly made of a liquid-permeable material and arranged to cover the upper surface of the absorbent body, and liquid-impermeable Disposable diapers comprising a back sheet made of a functional material and arranged so as to cover the lower surface of the absorber are widely used. By using the disposable diaper so that the surface of the top sheet is in contact with the skin of the wearer, the urine excreted by the wearer permeates the top sheet and is absorbed and held by the absorber. The back sheet having excellent leakage prevention prevents the excrement from leaking to the outside of the diaper.

  However, in the disposable diaper configured as described above, urine passes through the top sheet, but most of the feces do not pass through the top sheet and remains on the top sheet. And the stool (especially soft stool or watery stool) remaining on the top sheet flows toward the front body side region of the top sheet, and there is a problem that the urinary organs and genitals may be soiled.

  Therefore, a disposable diaper in which the portion corresponding to the feces excretion position on the surface of the top sheet is surrounded by a three-dimensional gather-like wall member and isolated from the other portions has been proposed (for example, Patent Documents 1 and 2). reference). In the disposable diaper having such a structure, the wall-like member can be expected to suppress the phenomenon that the stool flows toward the front body side region.

JP 2000-325394 A Japanese Patent No. 3550056

  However, the said disposable diaper had the subject that it was difficult to accommodate the excreted feces reliably in the internal space (stool accommodation space) enclosed by the wall-shaped member.

  The present invention has been made to solve the above-described problems of the prior art, and provides a disposable diaper that can reliably store excreted stool in a stool storage space.

  As a result of intensive studies to solve the problems of the prior art as described above, in the conventional disposable diaper, the wall-like member surrounding the excretion position of the stool is inclined toward the inside of the diaper. As described above (in a so-called inversion formula), the inventors have found that the above problems have occurred. Then, the present inventors have completed the present invention by conceiving that the above problems can be solved by turning the wall-like member outward by a method such as folding it outward from a certain position in the height direction of the wall. Specifically, the following disposable diapers are provided by the present invention.

[1] An absorbent body formed from the front body, the crotch part, and the back body, a top sheet that is made of at least a part of a liquid-permeable material and covers the upper surface of the absorbent body, and a liquid A back sheet made of an impermeable material and arranged to cover the lower surface of the absorber, and a stool separation wall made of a water-repellent sheet and configured to stand up three-dimensionally, A sheet material having a structure in which an elastic material for standing is sandwiched and fixed in an extended state between layers of a plurality of water-repellent sheets, and a part of the crotch region and the back body region of the top sheet surface The first sheet forming a fixed end side region extending from the fixed end to the pole changing portion with respect to the top sheet , and standing up in an annular shape so as to surround the feces falling region of the top sheet , Free from the above-mentioned inflection part The second sheet forming a free end side region extending to the end, the first sheet is inclined inward, the second sheet is inclined outward, and the stretchable material for standing up Comprises a first elastic member disposed at the pole changing portion and a second elastic member arranged on the free end side from the pole changing portion, and the first sheet has the first elastic member at one end portion. 1 stretchable material is disposed, and the other end is fixed to the surface of the top sheet to constitute the fixed end of the stool separation wall, and the one end is the one of the second sheet Joined along the edge opposite to the edge on which the second stretchable material is disposed to constitute the pole changing portion of the stool separation wall, and the second sheet is along the edge of the sheet The second elastic material is disposed, the second elastic material is not disposed, and the other end portion of the first sheet is disposed. The joined end portion on which the second stretchable material is disposed constitutes the free end without being joined to other members, and the contraction force F1 exhibited by the first stretchable material is the second stretchable shape. The disposable diaper comprised high compared with the contraction force F2 exhibited by the material .

[ 2 ] Of the surface of the top sheet, a pair of three-dimensional gathers made of a water-repellent sheet and configured to stand up three-dimensionally are attached to a region outside the fixed end of the stool separation wall, The disposable diaper according to [1], wherein the free end of the three-dimensional gather is arranged at a higher position than the free end of the stool separation wall.

[ 3 ] A urine separation wall made of a water-repellent sheet and configured to stand up three-dimensionally is provided, and the urine separation wall is sandwiched between a plurality of water-repellent sheets in a stretched state. consists sheet material fixed structure, of the surface of the topsheet, a portion of the front body region and the crotch region, and standing annularly to surround the urine fall region of said topsheet, said The sheet material includes a first sheet that forms a fixed end side region from the fixed end to the changing portion with respect to the top sheet, and a second end that forms a free end side region from the changing portion to the free end . is divided into a sheet, the first sheet is inclined inwardly, the second sheet is inclined outwardly, as the standing for stretchable material, the first stretchable member disposed in said inflection portion And arranged on the free end side from the changing portion. A second elastic material, wherein the first sheet has the first elastic material arranged at one end, and the other end is fixed to the surface of the top sheet, and the urine separation Constituting the fixed end of the wall, wherein the one end is joined along the edge of the second sheet opposite to the edge on which the second stretchable material is disposed, The second sheet is configured such that the second stretchable material is disposed along the edge of the sheet, the second stretchable material is not disposed, The other end portion of the sheet is joined and the end portion on which the second stretchable material is disposed constitutes the free end without being joined to another member, and is exhibited by the first stretchable material. serial contraction force F1, said that are highly configured than the contraction force F2 exerted by the second elasticized material [1] or [2] Disposable diapers.

  The disposable diaper of this invention can accommodate the excreted stool reliably in the stool accommodation space inside the stool separation wall.

  Hereinafter, the best mode for carrying out the disposable diaper of the present invention will be specifically described by taking a two-piece type pant diaper as an example. However, the present invention broadly encompasses disposable diapers having the invention specific items, and is not limited to the following embodiments. For the convenience of drawing, FIGS. 1C, 1D, 2B, 3B, 4B, and 4C are drawn in a form in which the leg-stretchable material is discarded.

  In this specification, the term “pants-type diaper” refers to the side edges corresponding to the front body 2 and the back body 6 (side edges 2a, 6a, side) as in the disposable diaper 1A shown in FIGS. 1A and 1B. By joining the edge portions 2b and 6b), a joint portion 8, one waist opening portion 10 and a pair of leg opening portions 12a and 12b are formed, which means a diaper configured in a pants shape in advance. To do.

  And "2 piece type" means an absorbent main body 14 that functions to absorb and retain the excrement of the wearer (absorption / holding function), like the disposable diaper 1A shown in FIGS. 1A and 1B, It is composed of an exterior member 16 having a function of encapsulating a wearer's body (a mounting function), and means a type of diaper in which an absorbent main body 14 is disposed inside the exterior member 16. As shown in FIG. 1C, the absorbent main body 14 is a member including an absorbent body 22, a top sheet 18, and a back sheet 20 as constituent elements.

  Furthermore, the "front body" is the part that covers the wearer's ventral side (front of the body) when the diaper is worn on the wearer, and the "inseam" is the wearer that wears the diaper on the wearer. The part covering the inseam of the wearer, “rear body”, means a part covering the wearer's back side (back of the body) when the wearer wears a diaper.

[1] Disposable diapers:
The disposable diaper of this invention is formed from each part of the front body 2, the crotch part 4, and the back body 6 like the disposable diaper 1A shown to FIG. 1A-FIG. 1D, and at least one part is liquid-permeable. A top sheet 18 made of a material and arranged to cover the upper surface of the absorber 22, a back sheet 20 made of a liquid-impermeable material and arranged to cover the lower surface of the absorber 22, and water repellency The disposable diaper includes a stool separation wall 24 made of a sheet and configured to stand up three-dimensionally.

  In the disposable diaper of the present invention, the stool separation wall 24 is annular so that the stool falling region of the top sheet 18 is surrounded by the crotch 4 region and the back body 6 region of the surface of the top sheet 18. The stool separation wall 24 has a fixed end side region from the fixed end 52 to the pole changing portion 54 with respect to the top sheet 18 and a free end side region from the pole changing portion 54 to the free end 56. It is characterized by the fact that the free end side region is inclined outward.

  In this way, when the stool separation wall is inclined outward from a certain position in the height direction of the wall, the opening of the stool storage space widens, and the stool easily falls into the stool storage space. Become. In addition, since the free end side (upper end side) of the stool separation wall has an outwardly inclined shape, the stool passes along the surface of the separation wall even if the stool falls on the outwardly tilted part. It falls into the storage space. Therefore, the excreted stool can be reliably stored in the stool storage space. Furthermore, when the opening part of the stool storage space is turned over, the opening part is likely to be in close contact with the wearer's skin. Therefore, it becomes difficult to produce a space | gap between a feces separation wall and a wearer's skin, and it becomes possible to guide | invade the inside of a feces accommodation space reliably, without leaking a sideways.

  The disposable diaper 1A shown in FIGS. 1A to 1D is provided with a urine separation wall 60 having the same structure as the stool separation wall 24 in addition to the stool separation wall 24. It is not limited to such a form. That is, the disposable diaper 1E shown in FIG. 6 that includes only the stool separation wall 24 and does not have the urine separation wall is naturally included in the scope of the present invention.

[1-1] Stool separation wall:
The stool separation wall is a wall-shaped member for isolating and storing excreted stool in a certain area. By providing the stool separation wall, the excreted stool is restrained from freely flowing on the surface of the top sheet. Therefore, it is possible to effectively prevent the problem that the urinary tract, genitals, and wearer's skin are contaminated by stool.

  The stool separation wall is constituted by a water-repellent sheet. With such a configuration, it is also possible to improve leakproofness against soft stool and watery stool. As the water repellent material, a nonwoven fabric such as spunbond or card embossing can be used. Among these, nonwoven fabrics such as SMS (spunbond / meltblown / spunbond) and SMMS (spunbond / meltblown / meltblown / spunbond) have the advantage of high water pressure resistance and can be suitably used.

  The stool separation wall is configured to stand up three-dimensionally. With such a configuration, when the diaper is worn, it is possible to form an internal space (stool storage space) for storing and separating the stool in a certain area.

The structure that can stand up three-dimensionally is a structure in which a stretchable material for standing is sandwiched and fixed between layers of a plurality of water-repellent sheets . The “interlayer between a plurality of water-repellent sheets” includes between the folded portions when one water-repellent sheet is folded.

When the stool separation wall having the above structure is fixed to the surface of the top sheet, the stretchable material for standing fixed in the stretched state contracts, and the stool separation wall stands up three-dimensionally. One or more standing stretchable members may be disposed per stool separation wall. And in order to make a stool separation wall stand up reliably, the elastic material for standing is arrange | positioned in the free end (upper end of a wall) vicinity of a stool separation wall .

  For example, the disposable diaper 1A shown in FIGS. 1B and 1C includes two standing stretchable materials 30 (first stretchable materials 30a) sandwiched between a plurality of water repellent sheets 24a and 24b, Between the folded-back portions, a stool separation wall 24 having a structure in which two standing stretchable materials 30 (second stretchable materials 30b) are sandwiched and fixed is provided. In this example, the first elastic member 30 a is disposed in the vicinity of the pole changing portion 54 of the stool separation wall 24, and the second elastic member 30 b is disposed in the vicinity of the free end 56 of the stool separation wall 24.

  As the stretchable stretchable material, stretchable materials that have been used in conventional disposable diapers can be suitably used. Specific examples include elastic rubber, elastic film, elastic foam (urethane foam, etc.), etc., as well as thread rubber and flat rubber made of elastic materials such as natural rubber and synthetic rubber (urethane rubber, etc.). .

  The stretchable material for standing is fixed to the water repellent sheet by an adhesive or other means. The fixing method may be, for example, adhesion using a hot melt adhesive or other highly fluid adhesive, or may be welding by heat such as heat sealing or ultrasonic waves.

  The stretchable material for standing up is preferably fixed in the stretched state in order to exert a sufficient stretch force on the stool separation wall. When the standing stretchable material is composed of natural rubber or synthetic rubber, it is preferably fixed in an extended state of 120 to 400%, more preferably fixed in an extended state of 200 to 300%. By fixing in the extended state in such a range, a sufficient stretching force can be applied, and the stool separation wall can be reliably erected.

  The feces separation wall is disposed in a part of the crotch region and the back body region on the surface of the top sheet. By forming a stool separation wall in the crotch region and the back body region (that is, the region excluding the front body region) on the surface of the top sheet, it becomes possible to suppress the phenomenon that the stool flows to the front body side. The problem of contaminating the urinary and genital organs with stool can be avoided.

  In order to obtain the above-described effect, the stool separation wall may be disposed in “a part” of the crotch region and the back body region, and does not need to be disposed in “all” of the crotch region and the back body region. For example, in the disposable diaper 1A shown in FIG. 1B, the stool separation wall 24 is arranged only in the rear region of the crotch region and the front region of the back body region on the surface of the top sheet 18, and the crotch region and the back body It is not located throughout the area.

  In the present specification, the term “inseam area” means an area that exists in a portion corresponding to the crotch part of the diaper among the constituent members (for example, a top sheet or the like). The same applies to the “front body region” and the “back body region”.

  The stool separation wall is disposed so as to surround the stool falling region of the top sheet. With such a configuration, excreted stool is captured in the vicinity of the stool dropping area and is prevented from diffusing to other areas.

  The “stool dropping area” is an area located immediately below the wearer's anus when a diaper is worn. The stool separation wall only needs to be arranged in a shape in which the locus of the fixed end partitions the stool falling region from other regions, and does not necessarily need to be arranged in an annular shape. That is, the feces separation wall may be arranged in a polygonal shape such as a rhombus shape or a rectangular shape in addition to a circular shape such as a circular shape or an elliptical shape.

  For example, the disposable diaper 1A shown in FIG. 1B is an example in which the stool separation wall 24 is arranged in a rectangular shape. In this example, four three-dimensional gather-like members are arranged in the front / rear / left / right so as to surround the feces falling area of the top sheet 18, and the end portions are joined to each other so that the rectangular stool separation wall 24 is formed. It is composed.

  Usually, the stool separation wall is disposed on the top sheet surface directly above the absorber. However, it is not necessary that the absorber exists immediately below all the fecal separation wall arrangement portions. That is, the feces separation wall may be disposed so as to protrude from the bonded portion (flap portion) of the top sheet and the back sheet.

The stool separation wall has a fixed end side region inclined inward and a free end side region inclined outward . In other words, the stool separation wall has a structure (so-called inward / outside-down structure) in which the stool separation wall is turned inward at a certain height from the fixed end and then turned over . With such a configuration, the feces accommodation space becomes a space having a constricted portion in the middle. Since this constricted portion also functions as a lid for the stool storage space, the stool once stored in the stool storage space is less likely to leak out to the outside again. Moreover, the effect that it becomes difficult for the stool accommodated in the stool accommodation space to adhere to a wearer's skin can be acquired.

  As a method for turning the stool separation wall upside down into a structure, the stool separation wall has a structure in which at least two standing stretchable materials are sandwiched and fixed between layers of a plurality of water repellent sheets, There is a method of making a difference in the shrinkage force exhibited by the two stretchable materials.

Specifically, the stool separation wall is made of a sheet material in which a standing stretchable material is sandwiched and fixed between layers of a plurality of water-repellent sheets, and is disposed at the pole changing portion as a standing stretchable material. A first expansion / contraction material and a second expansion / contraction material disposed on the free end side from the changing portion, and the contraction force F1 exhibited by the first expansion / contraction material is contracted by the second expansion / contraction material F2. It is configured higher than

  According to this structure, since the pole change part which has arrange | positioned the 1st elastic material shrink | contracts more largely than the free end side which has arrange | positioned the 2nd elastic material, a feces separation wall can be turned inward and outward. That is, the pole changing part (arrangement part of the first elastic member) of the stool separation wall is squeezed larger than the other part of the stool separation wall. Accordingly, the fixed end side region from the fixed end to the changing portion with respect to the top sheet is inclined inward, and the free end side region from the changing portion to the free end is inclined outward. be able to.

  The shrinkage force varies depending on the material of the stretchable material, the stretch rate when the stretchable material is fixed, the fineness (thickness) of the stretchable material, the number of stretchable materials arranged, and the like. Therefore, the shrinkage exerted by the first stretchable material arranged at the pole changing part is increased by increasing the stretch rate arranged at the pole changing part, increasing the fineness, increasing the number of arrangements, etc. compared to the free end side. The force F1 can be made higher than the contraction force F2 exerted by the second elastic member disposed on the free end side from the pole changing portion.

  The contraction forces F1 and F2 use strength values measured by a tensile tester. Specifically, the measurement site is cut out from the stool separation wall, stretched in the vertical direction until the stool separation wall in the contracted state is fully stretched, and the strength before the strength of the water-repellent sheet itself is expressed. Forces F1 and F2. As the tensile tester, for example, a strograph (trade name) manufactured by Toyo Seiki Seisakusho Co., Ltd. and Tensilon (trade name) manufactured by Orientec Co., Ltd. can be used.

  The value of the stretch rate is not particularly limited, but when the first stretchable material and the second stretchable material are the same material and the same fineness, the stretch rate of the first stretchable material is 150 to 300%, and the stretch rate of the second stretchable material is It is preferable that the first stretchable material is fixed at 120 to 250% at a stretch rate that is 50 to 100% higher than that of the second stretchable material.

  Further, the value of the fineness is not particularly limited, but when the first stretchable material and the second stretchable material are fixed at the same stretch rate, the fineness of the first stretchable material is 500 to 1200 dtex, and the fineness of the second stretchable material is 400 to 900 dtex. The first stretchable material is preferably made of rubber having a fineness higher by 50 to 300 dtex than the second stretchable material.

  For example, the disposable diaper 1A shown in FIG. 1C and FIG. 1D has the same configuration with respect to the material of the elastic material, the fineness (thickness) of the elastic material, and the number of the elastic materials arranged, and the expansion rate when the elastic material is fixed. In this example, the contraction force F1 is made higher than the contraction force F2 by making a difference.

  In the feces separation wall 24 of the disposable diaper 1A, the two first elastic members 30a arranged at the pole changing portion 54 have an elongation rate of 250%, and the two second elastic members arranged at the free end 56 side from the pole changing portion 54. The elastic material 30b is fixed at an expansion rate of 180%. Due to the difference in stretch rate, the fecal separation wall 24 is inclined inward in the region of the fixed end side from the fixed end 52 to the pole changing portion 54 with respect to the top sheet 18, and from the pole changing portion 54 to the free end 56. The free end side region of is inclined outward.

  Note that the “polarization part” means a part of a transition portion that changes from an inward direction to an outward direction in the inclination direction of the wall. For example, in the disposable diaper 1A shown in FIGS. 1C and 1D, the pole changing portion 54 is formed in a curved shape. However, as long as the inclination direction of the wall is changed, the shape of the pole changing portion is not limited to the curved shape, and may be a bent shape.

As a method of making the stool separation wall inward and outward, as shown in FIG. 1C, the stool separation wall 24 is composed of a fixed end 52 side region and a free end 56 side region using different sheet materials .

More specifically, as in the disposable diaper 1A shown in FIG. 1C and FIG. 1D, the feces separation wall 24 is a first sheet (in the illustrated example, a water-repellent sheet 24a) that forms a fixed end 52 side region as a sheet material. , 24b) and a second sheet (water repellent sheet 24c in the illustrated example) that forms a region on the free end 56 side, and the first sheet is provided with the first elastic member 30a at one end. In the second sheet, the second stretchable material 30b is disposed along the edge of the sheet. The other end of the first sheet is fixed to the surface of the top sheet 18 to form the fixed end 52 of the stool separation wall 24, and the second sheet is provided with the second elastic member 30b of the second sheet. It is joined along the edge opposite to the formed edge to constitute the pole changing portion 54 of the stool separation wall 24 .

  Further, as in the disposable diaper 1A shown in FIG. 1B, the stool separation wall is not formed using a plurality of three-dimensional gather-like members, but like the disposable diaper 1B shown in FIG. 2 or the disposable diaper 1C shown in FIG. In addition to the stool separation wall 24 having the fixed end 52 side region and the free end 56 side region made of different sheet materials, each of the “other sheet materials” is an integrated body having a through-hole formed in the center. A sheet is preferred. Such a structure is preferable because the opening can be formed in a desired shape by changing the shape of the through hole. For example, as shown in FIG. 2A, when the opening 28 has an elliptical shape, there is an advantage that stool can be easily guided to the inside of the stool separation wall 24.

  In the disposable diaper 1B shown in FIG. 2A and FIG. 2B, the region on the fixed end 52 side is fixed with the stretchable elastic material 30 (first elastic material 30a) sandwiched between the plurality of water repellent sheets 24a and 24b. It consists of a sheet material with a structure. This sheet material is formed in a rectangular shape, and an elliptical through hole is formed in the center. On the other hand, the region on the free end 56 side is composed of a sheet material having a structure in which a standing stretchable material 30 (second stretchable material 30b) is sandwiched and fixed between layers of the plurality of water repellent sheets 24d and 24e. This sheet material is formed in a rectangular shape, and an elliptical through hole is formed in the center.

  In the disposable diaper 1B shown in FIGS. 2A and 2B, both sheet materials are joined so that the edge of the through hole of the water repellent sheets 24d and 24e protrudes inward from the edge of the through hole of the water repellent sheets 24a and 24b. (Junctions 46 and 48). In this example, the water repellent sheet 24a and the water repellent sheet 24e are joined so as to contact each other.

  The disposable diaper 1C shown in FIGS. 3A and 3B has the same configuration as the disposable diaper 1B shown in FIGS. 2A and 2B, but the edges of the through holes of the water-repellent sheets 24a and 24b are formed on the water-repellent sheets 24d and 24e. This is an example in which both sheet materials are joined so as to protrude inward from the edge of the through-hole (joint portions 46, 48).

The disposable diaper 1D shown in FIGS . 4A to 4C includes a stool separation wall 24 having a structure in which two standing elastic members 30 are sandwiched and fixed between layers of a plurality of water repellent sheets 24a and 24b. The standing elastic member 30 is disposed in the vicinity of the free end 56 of the stool separation wall 24. In this example, the free end side region of the stool separation wall 24 is folded outward and the folded portion is fixed to a part of the fixed end side region. In this example, similarly to the disposable diaper 1A shown in FIGS. 1B to 1D, four solid gather-like members are arranged on the front and rear, left and right, and the ends are joined to each other, so that the rectangular feces separation wall 24 Is configured. And the junction part 58 which fixes a folding | returning part is formed in the center part of the three-dimensional gather-like member which comprises front and back.

[1-2] Urine separation wall:
The disposable diaper of the present invention is preferably provided with a urine separation wall for isolating and storing excreted urine in a certain region. This urine separation wall can be configured according to the stool separation wall already described.

  For example, the disposable diaper 1A shown in FIG. 1B and FIG. 1D includes a urine separation wall 60 made of water-repellent sheets 60a, 60b, and 60c and configured to stand up three-dimensionally. The urine separation wall 60 is disposed in a part of the front body region and the crotch region in the surface of the top sheet 18 so as to surround the urine dropping region of the top sheet 18. The urine separation wall 60 is inclined inward in a fixed end side region from the fixed end 52 to the changing portion 54 with respect to the top sheet 18, and the free end side from the changing portion 54 to the free end 56. The area is inclined outward.

  A disposable diaper 1A shown in FIG. 1B is an example in which urine separation walls 60 are arranged in a rectangular shape. In this example, four three-dimensional gather-like members are arranged on the front and rear, left and right so as to surround the urine dropping region of the top sheet 18, and the rectangular urine separation wall 60 is formed by joining the ends. It is composed. The “urine drop region” is a region located directly below the wearer's urinary organ when a diaper is worn.

  Moreover, in the disposable diaper 1A shown in FIG. 1B and FIG. 1D, the urine separation wall 60 is provided between the plurality of water-repellent sheets 60a and 60b or between the folded portions of the water-repellent sheet 60c. The first elastic material 64a and the second elastic material 64b) are sandwiched and fixed. The first stretchable material 64a disposed in the pole changing portion 54 is fixed at a stretch rate of 250%, and the second stretchable material 64b disposed on the free end 56 side from the pole changing portion 54 is fixed at a stretch rate of 180%. .

  A disposable diaper 1B shown in FIG. 2A includes a urine separation wall 60 having a structure similar to that of the stool separation wall 24. That is, the fixed end side region is composed of a sheet material having a structure in which a standing stretchable material (first stretchable material) is sandwiched and fixed between layers of a plurality of water repellent sheets including the water repellent sheet 60a. This sheet material is formed in a rectangular shape, and an elliptical through hole is formed in the center. On the other hand, the free end region is composed of a sheet material having a structure in which a standing stretchable material (second stretchable material 64b) is sandwiched and fixed between layers of a plurality of water repellent sheets including the water repellent sheet 60d. . This sheet material is formed in a rectangular shape, and an elliptical through hole is formed in the center.

  The disposable diaper 1B shown in FIGS. 2A and 2B is an example in which both sheet materials are joined such that the edge of the through hole of the water repellent sheet 60d protrudes inside the edge of the through hole of the water repellent sheet 60a. .

  The disposable diaper 1C shown in FIGS. 3A and 3B also includes a urine separation wall 60 having the same structure as the stool separation wall 24. However, unlike the urine separation wall 60 of the disposable diaper 1B shown in FIGS. 2A and 2B, the edge of the through hole of the water repellent sheet 60a protrudes inward from the edge of the through hole of the water repellent sheet 60d. Both sheet materials are joined.

  Further, in the disposable diaper 1D shown in FIGS. 4A and 4C, the free end side region of the urine separation wall 60 is folded outward, and the folded portion is fixed to a part of the fixed end side region. In this example, similarly to the disposable diaper 1A shown in FIG. 1C and FIG. 1D, four solid gather-like members are arranged on the front and rear, left and right, and the ends are joined together to form a rectangular urine separation wall 60. Is configured. And the junction part 58 which fixes a folding | returning part is formed in the center part of the three-dimensional gather-like member which comprises front and back.

[1-3] Solid gathering:
The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. By forming this three-dimensional gather, urine is excreted on the skin contact sheet, and even if urine diffuses along the skin contact sheet, the three-dimensional gather becomes a breakwater, and from the opening around the leg of the diaper, etc. Leakage (so-called “lateral leakage”) can be effectively prevented.

  In the disposable diaper of the present invention, a pair of three-dimensional gathers, which are made of a water-repellent sheet and configured to stand up three-dimensionally, are attached to a region outside the fixed end of the stool separation wall on the surface of the top sheet. It is preferable. In the disposable diaper of the present invention, a pair of three-dimensional gathers are preferably formed, but two or more pairs may be formed.

  Moreover, when attaching a three-dimensional gather, it is preferable that the free end of a three-dimensional gather is arrange | positioned in the position higher than the free end of a stool separation wall. With such a structure, even if excreted stool is not captured in the interior space of the stool separation wall and leaks outside the stool separation wall, leakage of the stool to the outside of the diaper is avoided.

  It is preferable that the free end of the three-dimensional gather is disposed at a position 10 to 40 mm higher than the free end of the stool separation wall. More specifically, the height of the stool separation wall is preferably 10 to 60 mm, and the height of the three-dimensional gather is preferably 20 to 100 mm.

  The structure of a three-dimensional gather can employ | adopt the structure used for the conventional disposable diaper and other absorbent articles. For example, it is possible to suitably use a material in which a stretchable material (a three-dimensional gathered stretchable material) is arranged on a part of the sheet material, and a gather is formed on the sheet material by the three-dimensional gathered stretchable material.

  As the sheet material constituting the three-dimensional gather, it is preferable to use a water-repellent material from the viewpoint of improving the leak-proof property of the three-dimensional gather. There are three types of three-dimensional gathers: (1) Inverted gathers that incline toward the inner side of the diaper, (2) Outer gathers that incline toward the outer side of the diaper, and (3) A bent portion at a part in the height direction. And three-dimensional gathers (C-folded gathers, Z-folded gathers, etc.) in which folded portions are formed. Of these, inward gathering is preferable in terms of high leakage prevention.

  The three-dimensional gather is preferably formed over the entire area of both side edges of the absorbent body, but may be disposed at least in a portion corresponding to the crotch part of the diaper for the purpose of preventing side leakage of urine.

  “Along each side edge of the absorber” means that the absorber is attached in the same direction as the side edge of the absorber. However, the side edge of the absorber may be formed in a curved line along the leg opening, and is not necessarily formed in a straight line. Therefore, it is not always necessary to be attached so as to be in contact with the side edge of the absorber, and it is not necessary to be attached so as to draw the same locus as the side edge of the absorber. Usually, the support wall is often arranged linearly regardless of the shape of the absorber. For example, like the disposable diaper 1A shown in FIG. 1B, the three-dimensional gathers 26 (26a, 26b) are linearly arranged in the front-rear direction of the diaper.

[1-4] Absorber:
The absorber is a member for absorbing and holding the wearer's urine. The absorber is made of an absorbent material because it needs to absorb and retain the wearer's urine and body fluid.

  Examples of the absorbent material constituting the absorber include conventionally known absorbent materials usually used for disposable diapers and other absorbent articles, such as fluff pulp, super absorbent polymer (Super Absorbent Polymer; hereinafter referred to as “SAP”). And a hydrophilic sheet. It is possible to use wood pulp or non-wood pulp defibrated as fluff pulp, sodium polyacrylate as SAP, tissue, absorbent paper, hydrophilized nonwoven fabric as hydrophilic sheet preferable.

  These absorbent materials are usually used as a single-layer or multi-layer mat. Under the present circumstances, 1 type may be used independently among the said absorptive materials, and 2 or more types may be used together. Especially, what used together about 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, the SAP may be uniformly mixed in each mat of fluff pulp, or may be arranged in layers between the layers of the multilayer fluff pulp.

  It is preferable that the absorber is interposed at least in part between the top sheet and the back sheet. Usually, the absorber is interposed between the top sheet and the back sheet by being sandwiched between the top sheet and the back sheet and sealing the peripheral edge thereof. Therefore, the flap part in which the absorber is not interposed is formed between the top sheet and the back sheet at the peripheral part of the absorber.

  It is preferable that the absorber is entirely wrapped with a hydrophilic sheet. Such a configuration has an advantage that SAP can be prevented from leaking from the absorber and shape stability can be imparted to the absorber.

  Although there is no restriction | limiting in particular about the shape of an absorber, The shape used in the conventional disposable diaper and other absorbent articles, for example, a rectangular shape, an hourglass type, a gourd type, a T shape etc. can be mentioned.

[1-5] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the upper surface (surface located in a wearer's skin side at the time of mounting | wearing of a diaper) may be coat | covered. At least a part (all or a part) of the top sheet is made of a liquid-permeable material because the absorber disposed on the lower surface side needs to absorb the wearer's urine.

  Examples of the liquid permeable material constituting the top sheet include a woven fabric, a nonwoven fabric, and a porous film. Among these, it is preferable to use a non-woven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon and subjected to a hydrophilic treatment.

  The top sheet may be composed of a single sheet material, but may be composed of a plurality of sheet materials. For example, in a tape-type diaper described later, a top sheet (center sheet) made of a liquid-permeable material is disposed at the center of the diaper, and a top sheet (side sheet) made of a water-repellent material is disposed on the side flap portion of the diaper. A form of arranging is often used.

[1-6] Backsheet:
A back seat | sheet is a sheet | seat arrange | positioned so that the lower surface (surface located in a wearer's clothing side at the time of mounting | wearing of a diaper) may be coat | covered. The back sheet is made of a liquid-impermeable material because it is necessary to prevent the wearer's urine from leaking outside the diaper.

  Examples of the liquid-impermeable material constituting the backsheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, a microporous polyethylene film is preferably used. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid impervious but has moisture permeability, so that the inside of the diaper can be prevented from being steamed There is.

  Note that a sheet material (cover sheet) may be bonded to the outer surface of the back sheet. This cover sheet is used to reinforce the back sheet and improve the feel (tactile feeling) of the back sheet.

  Examples of the material constituting the cover sheet include woven fabric and non-woven fabric. Especially, it is preferable to use the dry nonwoven fabric and wet nonwoven fabric which consist of thermoplastic resins, such as polyethylene, a polypropylene, and polyester.

[1-7] Absorbent body:
In the two-piece type pants-type diaper, the top sheet, the back sheet, and the absorbent body are configured as one member called an “absorbent body” that is responsible for absorption and holding functions, and an exterior member that is manufactured separately. A disposable diaper is formed by joining. Like the sanitary napkin, this absorbent main body has a top sheet on the upper surface side of the absorbent body and a back sheet on the lower surface side. The absorbent body is interposed between the top sheet and the back sheet. It has a structured. For example, in the disposable diaper 1A shown in FIG. 1C, the absorbent body 22 is sandwiched between the top sheet 18 and the back sheet 20, and the periphery of the absorbent body 22 is sealed, whereby the top sheet 18 and the back sheet 20 are sealed. It is the example which comprised the absorptive main body 14 of the structure where the absorber 22 was interposed in between.

  An absorptive main body is comprised by the size which covers at least the crotch part of a diaper. However, in order to ensure the effect of preventing leakage, it is preferable to have a size that covers not only the crotch part but also a part of the front body and the back body. The absorptive main body can be fixed to the exterior member using, for example, a hot melt adhesive.

[1-8] Exterior member:
The exterior member is a member having a mounting function for encapsulating the wearer's body, and specifically, is a sheet-like member that forms the front body, the crotch portion, and the back body.

  In the two-piece type pants-type diaper, the absorbent main body serves exclusively for the absorption / holding function of absorbing and holding the excrement of the wearer, so a liquid-impermeable material as a material constituting the exterior member There is no need to use. Examples of the material constituting the exterior member include a nonwoven fabric composed of synthetic fibers made of polyethylene, polypropylene, polyester, and other thermoplastic resins.

  And in order to fix an exterior member in the state which pinched | interposed the elastic material etc. around the leg, it is often configured by bonding two or more nonwoven fabrics together. For example, in the disposable diaper 1A shown in FIGS. 1A to 1C, the exterior member 16 is composed of two nonwoven fabrics, and the leg elastic members 40, the waist elastic members 42, and the belly elastic members between the two nonwoven fabrics. This is an example in which 44 is sandwiched and fixed.

[1-9] Various elastic materials:
In a pants-type disposable diaper, it is common to arrange an elastic material around the legs, arrange an elastic material around the waist, and more preferably arrange an elastic material around the abdomen.

  The leg circumference elastic material is an elastic material arranged along the leg circumference opening. By arranging the leg-stretchable material, a gather (leg gather) rich in stretchability can be formed in the leg-surrounding opening. Therefore, it is difficult to form a gap around the leg, and urine leakage from the opening around the leg can be effectively prevented.

  The waist elastic material is an elastic material arranged along the waist opening. By arranging the elastic material around the waist, a gather (waist gather) rich in elasticity can be formed in the waist opening. This waist gather makes it difficult for gaps to be formed around the waist, preventing urine leakage from around the waist, and improving the fit of the diaper to the wearer, thereby preventing the diaper from falling down.

  An abdominal circumference elastic material is an elastic material arrange | positioned in the part (namely, part equivalent to a wearer's abdominal circumference) between a waist circumference opening part and a leg circumference opening part. By arranging the elastic material around the abdomen, it is possible to form a highly elastic tammy gather around the abdomen of the wearer. This Tammy Gather, together with West Gather, can make the diaper fit and anti-slip effect even better.

  In the disposable diaper 1A shown in FIGS. 1A and 1B, a plurality of leg-hole stretchable members 40 are arranged on the periphery of the leg-hole openings 12 a and 12 b, and the waist-hole opening 10 is provided on the periphery of the waist-hole opening 10. A plurality of waist elastic members 42 are arranged so as to surround, and further, a portion between the waist opening 10 and the leg openings 12a and 12b (that is, a portion corresponding to the wearer's belly). This is an example in which a plurality of belly stretchable members 44 are arranged so as to surround the wearer's belly. Although not shown in FIG. 1B, the leg elastic members 40 are arranged so as to draw a U-shape on the front body 2 side and the back body 6 side, and are cut at the center of the crotch 4. Yes.

  About these elastic materials, the structure similar to the already described elastic material for standing can be employ | adopted. Then, after considering the degree of gather contraction and the like, the constituent material, the elongation rate of the material, the stretched state at the time of fixing, etc. may be determined.

[2] Manufacturing method:
Hereinafter, an example of a method for producing the disposable diaper of the present invention will be described with reference to an example of producing a disposable diaper 1A (a two-piece type pant diaper) shown in FIGS. 1A to 1D. In particular, the process of producing the stool separation wall will be described in detail with reference to the process diagram of FIG. For convenience of drawing, only the stool separation wall is shown in FIG. 5 and the urine separation wall is omitted. Actually, the urine separation wall was produced by the same method as the stool separation wall.

[2-1] Production of stool separation wall and urine separation wall:
As shown in FIG. 5, the first stretchable material 30a is placed and fixed on the surface of the water-repellent sheet 24b coated with hot melt adhesive, and the water-repellent sheet 24a is bonded to the upper surface to fix the stool separation wall. A portion to be an end region is formed ([I] diagram). At this time, as shown in the drawing, if the water-repellent sheet 24b protrudes from the water-repellent sheet 24a to form a single layer portion, the flexibility of the bonded portion can be ensured and the shape followability is impaired. It is preferable because it is not present (but not essential). A hot melt adhesive is applied to the portion where the water-repellent sheet 24b is a single layer to form a portion that becomes the joint 46 (FIG. [II]).

  On the other hand, the second stretchable material 30b is placed and fixed on the surface of the water-repellent sheet 24c having a part thereof coated with a hot melt adhesive (FIG. [III]). Thereafter, one end of the water-repellent sheet 24c is folded, and the folded portions are bonded so as to cover the second stretchable material 30b, thereby forming a portion that becomes a free end side region of the feces separation wall (FIG. IV).

  Subsequently, the part which becomes a fixed end side area | region of a stool separation wall, and the part which becomes a free end side area | region are bonded together, the junction part 46 is formed, and the three-dimensional gather-like member 70 is formed ([V] figure). The three-dimensional gather-like member 70 is folded back at the portion of the first elastic member 30a to form a fixed end side region 70a and a free end side region 70b ([VI] view).

  A hot melt adhesive is applied in a frame shape to a part of the surface of the top sheet 18 to form a portion that becomes the joint 48 ([VII] diagram). The four solid gather-like members 70 are bonded to this portion to form the joint portion 48. At this time, four three-dimensional gather-like members 70 are arranged on the front and rear, left and right so as to surround the feces falling area of the top sheet 18, and the end portions are joined to each other, so that the rectangular stool separation wall 24 is attached. The obtained top sheet 18 is obtained ([VIII] figure). A urine separation wall (not shown) is formed in the same manner.

[2-2] Formation of absorbent main body:
As shown in FIG. 5, a hot melt adhesive is applied to a part of the surface of the back sheet 20 in a frame shape to form a part to be a joint 50, and a hydrophilic property not shown in the center of the back sheet 20. The absorber 22 wrapped in a sheet is placed ([IX] diagram). The top sheet 18 provided with the stool separation wall 24 is bonded to the upper surface to form a joint 50, and the absorbent main body 14 provided with the stool separation wall 24 is obtained (FIG. [X]). Thereby, the peripheral part of the absorber 22 is sealed so as to be sandwiched between the top sheet 18 and the back sheet 20.

[2-3] Production of solid gathers:
One end of the water-repellent sheet 32a (32b) is folded back, and the two-sided stretchable materials 36a, 36b (36c, 36d) are sandwiched between the folded portions so that the three-dimensional gather 26a (26b) is bonded. )

[2-4] Attaching a three-dimensional gather to the absorbent main body:
Solid gathers 26a and 26b are fixed to the surface of the top sheet 18, and the three-dimensional gathers 26a and 26b are bonded so as to sandwich the side edges of the absorbent main body 14, and the three-dimensional gathers 26a and 26b are attached to the absorbent main body 14. Attached.

[2-5] Production of exterior member:
First, two nonwoven fabrics to be the exterior member 16 are prepared, and a waist elastic member 42, an abdominal elastic member 44, and a leg elastic member 40 are disposed on and bonded to the upper surface of one of the nonwoven fabrics. And by laminating and fixing another nonwoven fabric on the upper surface, the waist elastic member 42, the belly elastic member 44 and the leg elastic member 40 are interposed between the two nonwoven materials. The exterior member 16 is obtained. In addition, about the leg periphery elastic material 40, only the center part of the crotch part 4 is made into the non-adhesion state, and it snaps back by cut | disconnecting the non-adhesion part.

[2-6] Manufacture of disposable diapers:
The absorbent main body 14 is disposed and fixed near the crotch part of the exterior member 16. Next, the absorbent body 14 is turned inside, and the front body 2 and the back body 6 are folded in two so that the front body 2 and the back body 6 are matched, and the front body 2 and the back body 6 are joined by means such as heat sealing to form the joint 8. By doing, the disposable diaper 1A shown to FIG. 1A-FIG. 1D can be manufactured.

  The series of steps as described above can be continuously performed by mechanical means. For example, by adopting a method / apparatus such as continuously feeding a long sheet material or stretchable material from a roller, it becomes possible to continuously manufacture disposable diapers, which contributes to an improvement in productivity.

[3] Application target of the present invention:
The application object of the disposable diaper of this invention is not restricted to the said 2 piece type underpants type diaper, For example, it can apply also to a 1 piece type underpants type diaper and a tape type diaper. That is, also in these disposable diapers, the effect of the disposable diaper of the present invention can be enjoyed by disposing the skin contact sheet above the surface of the top sheet and forming at least a pair of three-dimensional gathers.

  “One-piece type” includes a top sheet, a back sheet, and an absorber as in the case of the two-piece type. However, the absorber that performs absorption and holding functions is interposed between the top sheet and the back sheet. This means a diaper of a type that is (built-in) and configured integrally with a top sheet and / or a back sheet that has a mounting function.

  The “tape-type diaper” includes a top sheet, a back sheet, an absorber interposed in at least a part between the two sheets, and a tape fastener for wearing. It shall mean a disposable diaper that can fix the back and back parts to each other. “Tape-type diapers” also have “1-piece type” and “2-piece type” as in pants-type diapers, but the disposable diaper of the present invention is applicable to any type of tape-type diaper.

  The disposable diaper of the present invention can be suitably used as a diaper for infants or for adults such as elderly people and persons with disabilities who need care. And since the disposable diaper of this invention is excellent in the accommodation capacity of the excreted feces, it can be used especially suitably as a disposable diaper for adults with many amounts of excrement.

It is a schematic perspective view which shows one Embodiment of the disposable diaper of this invention, and is a schematic perspective view which shows the state seen from the front of a diaper. It is a top view which shows one embodiment of the disposable diaper of this invention, is a top view which expand | deploys the disposable diaper shown to FIG. 1A, and shows the state seen from the absorptive main body side of the diaper. It is a schematic sectional drawing which shows one Embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section which cut | disconnected the disposable diaper shown to FIG. 1B along the X-X 'line. It is a schematic sectional drawing which shows one Embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section which cut | disconnected the disposable diaper shown to FIG. 1B along the Y-Y 'line. It is a top view which shows another embodiment of the disposable diaper of this invention, is a top view which expand | deploys a disposable diaper and shows the state seen from the absorptive main body side of the diaper. It is a schematic sectional drawing which shows another embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section which cut | disconnected the feces separation wall formation part of the disposable diaper shown to FIG. 2A along the X-X 'line. It is a top view which shows another embodiment of the disposable diaper of this invention, is a top view which expand | deploys a disposable diaper and shows the state seen from the absorptive main body side of the diaper. It is a schematic sectional drawing which shows another embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section which cut | disconnected the stool separation wall formation part of the disposable diaper shown to FIG. 3A along the XX 'line. . Is a plan view showing an embodiment of a disposable diaper, the disposable diaper to expand, is a plan view showing a state seen from the absorbent body of the diaper. It is a schematic sectional drawing which shows embodiment of a disposable diaper, and is a schematic sectional drawing which shows the cross section which cut | disconnected the disposable diaper shown to FIG. 4A along the XX 'line. It is a schematic sectional drawing which shows embodiment of a disposable diaper, and is a schematic sectional drawing which shows the cross section which cut | disconnected the disposable diaper shown to FIG. 4A along the YY 'line. It is process drawing which shows the manufacturing process of the disposable diaper of this invention, and is process drawing which shows the process of obtaining the absorptive main body provided with the feces separation wall. It is a top view which shows one embodiment of the disposable diaper of this invention, is a top view which expand | deploys a disposable diaper and shows the state seen from the absorptive main body side of the diaper.

Explanation of symbols

1A, 1B, 1C, 1D, 1E: disposable diapers, 2: front body, 2a, 2b: side edge, 4: crotch, 6: back body, 6a, 6b: side edge, 8: joint, 10 : Opening around waist, 12, 12a, 12b: Opening around leg, 14: Absorbent body, 16: Exterior member, 18: Top sheet, 20: Back sheet, 22: Absorber, 24: Stool separation wall, 24a 24b, 24c, 24d, 24e: water-repellent sheet, 26, 26a, 26b: three-dimensional gather, 28: opening, 30: stretchable material for standing, 30a: first stretchable material, 30b: second stretchable material, 32, 32a, 32b: Water repellent sheet, 34: Free end, 36, 36a, 36b, 36c, 36d: Standing stretchable material, 38: Fixed end, 40: Leg stretchable material, 42: Waist stretchable material, 44: Belly Around elastic material, 46, 48, 50: contact Part, 52: fixed end, 54: variable polarity part, 56: free end, 58: junction, 60: urine separation wall, 60a, 60b, 60c, 60d: water repellent sheet, 62: opening, 64: for standing Stretch material, 64a: first stretch material, 64b: second stretch material, 70: three-dimensional gather-like member, 70a: fixed end side region, 70b: free end side region.

Claims (3)

It is formed from each part of the front body, the crotch, and the back body,
An absorbent body, a top sheet that is at least partially made of a liquid-permeable material and arranged to cover the upper surface of the absorbent body, and a liquid-impermeable material that covers the lower surface of the absorbent body It is composed of an arranged back sheet and a water-repellent sheet, and has a stool separation wall configured to stand up three-dimensionally,
The stool separation wall is composed of a sheet material having a structure in which a standing stretchable material is sandwiched and fixed between layers of a plurality of water repellent sheets , and the crotch region and the back body of the top sheet surface. In a part of the area , standing up in an annular shape so as to surround the stool falling area of the top sheet,
The sheet material includes a first sheet that forms a fixed end side region from the fixed end to the changing portion with respect to the top sheet, and a free end side region that extends from the changing portion to the free end . Divided into two sheets , the first sheet is inclined inward, the second sheet is inclined outward ,
As the stretchable material for standing up, it comprises a first stretchable material arranged at the pole changing portion, and a second stretchable material arranged at the free end side from the pole changing portion,
The first sheet is configured such that the first elastic member is disposed at one end portion, and the other end portion is fixed to the surface of the top sheet to constitute the fixed end of the stool separation wall. The one end portion is joined along the end edge of the second sheet opposite to the end edge where the second stretchable material is disposed, and constitutes the pole changing portion of the stool separation wall,
In the second sheet, the second stretchable material is disposed along the edge of the sheet, the second stretchable material is not disposed, and the other end of the first sheet is disposed. And the end where the second elastic material is disposed constitutes the free end without being joined to other members,
A disposable diaper in which the shrinkage force F1 exhibited by the first stretchable material is configured to be higher than the shrinkage force F2 exhibited by the second stretchable material . Of the surface of the top sheet, in a region outside the fixed end of the stool separation wall, a pair of three-dimensional gathers, each composed of a water-repellent sheet and configured to stand up three-dimensionally, are attached.
The disposable diaper according to claim 1, wherein a free end of the three-dimensional gather is arranged at a position higher than a free end of the stool separation wall. A urine separation wall made of a water-repellent sheet and configured to stand up three-dimensionally,
The urine separation wall is made of a sheet material having a structure in which a standing stretchable material is sandwiched and fixed between layers of a plurality of water repellent sheets, and a front body region and a crotch portion of the surface of the topsheet. In a part of the area , standing up in an annular shape so as to surround the urine dropping area of the top sheet,
The sheet material includes a first sheet that forms a fixed end side region from the fixed end to the changing portion with respect to the top sheet, and a free end side region that extends from the changing portion to the free end . Divided into two sheets , the first sheet is inclined inward, the second sheet is inclined outward ,
As the stretchable material for standing up, it comprises a first stretchable material arranged at the pole changing portion, and a second stretchable material arranged at the free end side from the pole changing portion,
The first sheet has the first elastic member disposed at one end, and the other end is fixed to the surface of the top sheet to constitute the fixed end of the urine separation wall. The one end portion is joined along the end edge of the second sheet opposite to the end edge where the second stretchable material is disposed, and constitutes the pole changing portion of the urine separation wall;
In the second sheet, the second stretchable material is disposed along the edge of the sheet, the second stretchable material is not disposed, and the other end of the first sheet is disposed. And the end where the second elastic material is disposed constitutes the free end without being joined to other members,
The disposable diaper according to claim 1 or 2 , wherein the contraction force F1 exhibited by the first stretchable material is configured to be higher than the contraction force F2 exhibited by the second stretchable material .

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