JP2019071956A - Article for wearing - Google Patents

Abstract

An object of the present invention is to suppress displacement of a rear waist region with respect to a back portion, and have a portion capable of accommodating and holding excrement moving toward a waist opening side, while deforming in response to a change in posture of a wearer and When the posture returns to the original posture, it returns to the original state. A disposable diaper includes a waistband portion having a rear waist region located on a skin-facing surface and extending laterally, an outer wall portion 43 extending upward from a crotch region side, and a waistband portion and an outer wall portion in a front-rear direction. In a state where the inner wall portion is contracted in the horizontal direction by the elastic elasticity of the inner wall portion 42 which is located between and has elastic elasticity in the lateral direction, the waistband portion and the inner wall portion are opposed to each other, and the inner wall portion and the outer wall portion are opposed to each other. A space S is defined between the inner wall portion and the outer wall portion, and the rear end portion 12B of the absorbent chassis has a liquid-impermeable or liquid-impermeable back sheet 86, and a space is formed on the inner surface of the outer wall portion. It extends inward, and the extensional stress in the lateral direction of the outer wall is smaller than the extensional stress in the lateral direction of the inner wall. [Selection diagram] FIG.

Description

  The present invention relates to a wearing article such as a disposable diaper.

  Conventionally, it has vertical and horizontal directions in the wearing state, and front and back direction that intersects the vertical, and is positioned on the skin facing surface and the non-skin facing surface, the inner surface facing the wearer's body, and the opposite side Diapers having an outer surface, a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, and an absorbent chassis extending from the crotch region to the front and rear waist regions are known.

  For example, the front waist region of the diaper disclosed in Patent Document 1 has a belt-like waist extension on the non-skin-facing surface of the waist opening.

  The waist extension extends laterally in the lateral direction to the side edges of the rear waist region. The waist extension portion is located between the waistband portion and the outer wall portion in the front-rear direction, with the waist band portion located on the skin facing surface and extending in the lateral direction, the outer wall portion located closest to the non-skin facing surface And an inner wall portion.

JP, 2011-189068, A

  In the wearing article disclosed in Patent Document 1, the length dimension of the rear waist region can be expanded by the wearer himself pulling up while holding the waistband portion. Thus, for example, even if the wearer bends his back or raises his legs in a supine state and the rear waist area is pulled down, the wearer's back is covered by pulling up the waistband portion. be able to.

  In addition, since a plurality of gathers are formed in the waist band portion, there is a possibility that the excrement may leak out of the gap of the gathers through the skin, and excrete between the inner wall portion and the outer wall portion of the waist extension portion. If the space which can accommodate a thing is formed, the leak to the exterior can be controlled. However, since the outer wall portion has an elastic body extending in the lateral direction, the outer wall portion approaches the inner wall portion by the contraction action of the elastic body, and a space capable of containing excrement between the inner wall portion and the outer wall portion is formed. I can not do it. In addition, the waist extension has a problem that it can not return to the original state unless a force is externally applied once the third party such as the mother or the user lifts it while holding it.

  The present invention suppresses the back displacement (displacement of the rear waist region with respect to the back), and copes with changes in the wearer's posture while having a portion capable of containing and holding excrement moving to the waist opening side. The present invention relates to the provision of a wearable article that can be deformed and returned to the original state when the attitude returns to the original position.

  In order to solve the above problems, the present invention has vertical and horizontal directions in the worn state, and front and back directions intersecting the vertical and horizontal directions, and the skin facing surface and the non-skin facing surface, the front A disposable wearing article comprising a waist area, a rear waist area, a crotch area located between the front and rear waist areas, and an absorbent chassis extending from the crotch area to the front and rear waist areas.

  The rear waist region in the present invention is a waist band portion located on the skin facing surface and extending in the lateral direction, an outer wall portion extending upward from the crotch region side, and the waist band portion in the front-rear direction The waistband portion has an inner wall portion located between the outer wall portion and having the elastic elasticity in the lateral direction, and the inner wall portion is contracted in the lateral direction by the elastic elasticity of the inner wall portion. And the inner wall face each other, the inner wall and the outer wall face each other to define a space between the inner wall and the outer wall, and the rear end of the absorbent chassis is not It has a liquid-permeable or liquid-impermeable back sheet and extends inside the space at the inner surface of the outer wall, and the tensile stress in the lateral direction of the outer wall is the lateral direction of the inner wall. Less than elongation stress And said that no.

  The rear waist region is formed by the sheet, and by bending the sheet, the first bent portion which is located between the waistband portion and the inner wall portion and extends in the lateral direction, and is located between the inner wall portion and the outer wall portion A laterally extending second bent portion, a waistband portion, an inner wall portion, and an outer wall portion are formed. Therefore, since the waist band portion, the inner wall portion, and the outer wall portion can be formed by bending the sheet constituting the rear waist region, it is not necessary to fix a plurality of sheets by the adhesive and the adhesive is cured. Can prevent the touch of the sheet from being reduced.

  The rear waist region has a wall forming sheet, and by bending the wall forming sheet, a laterally extending first bent part, a waist band, which is located between the waist band and the inner wall, and An inner wall portion is formed. Therefore, the space for accommodating excrement can be easily formed by fixing the inner wall portion and the outer wall portion.

  The waistband portion has elastic stretchability in the lateral direction, and the correlation of the extension stress in the lateral direction of the waistband portion, the inner wall portion, and the outer wall portion is: waistband portion> inner wall portion> outer wall portion. Therefore, since the extension stress of the waist band portion is large, it is possible to suppress the displacement of the position of the rear waist region with respect to the wearer's back, and the extension stress of the outer wall portion is small. It can suppress that space becomes small.

  The absorbent chassis has an absorbent core extending from the crotch area to the front and back waist area, and the absorbent core extends to the inside of the space between the inner wall and the outer wall. Therefore, when excrement such as soft stool is excreted in the space between the inner wall portion and the outer wall portion, excrement can be absorbed by the absorbent core.

  In the natural state, the waist opening edge of the front waist region is located below the waist opening edge of the rear waist region. Therefore, when the wearing article is worn by an infant, the upper end edge of the front waist area is relatively low, and the wearer's umbilical part is exposed, and the umbilical part touches the front waist area to cause discomfort or irritation Can be suppressed.

  The outer wall portion is not provided with an elastic body extending in a contractable manner in the lateral direction. Therefore, the space between the inner wall portion and the outer wall portion can be suppressed from becoming small, and the elastic stretchability of the inner wall portion deforms according to the posture of the wearer, and the posture returns to the original posture. You can return to the original state when you return.

  The rear waist region has a pair of first fixing regions respectively joining the waistband portion, the inner wall portion and the outer wall portion, and a pair of second fixing regions respectively joining the inner wall portion and the outer wall portion, The lateral dimension of the first fixation region is larger than the lateral dimension of the second fixation region, and the second fixation region is located inward of the first fixation region. Therefore, the dimension of the horizontal direction of the space between an inner wall part and an outer wall part can be made small, and it can suppress that the excretion inside the space comes out outside.

  A plurality of elastic members extending in the lateral direction are disposed in the waist band portion and the inner wall portion, and the dimension in the vertical direction of the elastic body in the waist band portion is based on the dimension in the vertical direction of the elastic body in the inner wall portion Too small. Therefore, it is possible to easily make the tensile stress of the waistband greater than the tensile stress of the inner wall.

  According to the wearing article according to the present invention, due to the elastic stretchability of the inner wall portion, it can be deformed according to the posture of the wearer, and can return to the original state when the posture returns to the original posture. In addition, the rear waist region can be expanded in the vertical direction to suppress back displacement, and the tensile stress in the lateral direction of the outer wall portion is smaller than the tensile stress in the lateral direction of the inner wall portion. The contraction force can prevent the space located between the inner wall portion and the outer wall portion from being reduced, and can maintain a space for containing excrement.

The drawings illustrate specific embodiments of the present invention and include not only the essential features of the invention, but also optional and preferred embodiments.
The perspective view which looked the diaper of 1st Embodiment which is an example of the wearing article of the present invention from the back side. The top view which looked the diaper in a non-wearing state (natural state) from the front. The partially broken development view of a diaper in the state which extended each elastic body to the transverse direction of a diaper, and the longitudinal direction. The disassembled perspective view of a diaper. Development view of the rear waist panel. VI-VI sectional view taken on the line of FIG. Sectional drawing similar to FIG. 6 in the state which the inner wall part and outer wall part in a back waist area deform | transformed. (A) The side view which shows a mode when a wearer raises a leg in a supine state. (B) The side view which shows a mode when a wearer extends a leg in a supine state. The figure similar to FIG. 3 of the diaper which concerns on 2nd Embodiment.

  A pants-type disposable diaper (pull-on diaper) 10 shown as an example of the disposable wearing article according to the present invention has a longitudinal direction Y, a transverse direction X, and a longitudinal direction Z which is a thickness direction intersecting (orthogonal to) them, longitudinal It has a longitudinal axis P extending along the direction Y and bisecting the dimension in the lateral direction X, and a transverse axis Q extending along the transverse direction X and bisecting the dimension in the longitudinal direction Y.

  FIG. 1 shows a diaper 10 worn by a wearer, but the body of the wearer is omitted for the convenience of description. Referring to FIGS. 1 to 3, the diaper 10 has an absorbent chassis joined to the skin-facing surface and the non-skin-facing surface facing it, an annular elastic waist panel 11 extending around the waist, and the elastic waist panel 11. 12 includes a front waist region 13, a rear waist region 14, and a crotch region 15 located between the front and rear waist regions 13 and 14. The diaper 10 is formed symmetrically with respect to the longitudinal axis P. The elastic waist panel 11 comprises a front waist panel 17 located in the front waist region 13 and a rear waist panel 18 located in the rear waist region 14.

  The front waist region 13 has an inner end 13a extending in the lateral direction X, an outer end (front waist opening edge) 13b extending in the lateral direction X opposite to the inner end 13a in the longitudinal direction Y, and an inner end It has a horizontally long rectangular shape defined by the side edges 13c extending in the longitudinal direction Y between the edge 13a and the outer edge 13b.

  The rear waist region 14 has an inner edge 14a extending in the lateral direction X, an outer edge (front and rear waist opening edge) 14b extending in the lateral direction X opposite to the inner edge 14a in the longitudinal direction Y, and an outer edge It is defined by both outer edges 14c extending downward from the edge 14b and both inner edges 14d connecting the outer edges 14c and the inner edge 14a and extending in a manner inclined downward to the longitudinal direction Y and the transverse direction X It has a substantially trapezoidal shape.

  Each of the side edges 13c of the front waist region 13 and each of the outer edges 14c of the rear waist region 14 are overlapped with each other and connected by the side seams 19 spaced in the longitudinal direction Y to form a diaper Ten side edges are formed to define a waist opening 21 and a pair of leg openings 22. The side seams 19 are made by known adhesive means, for example, various known heat welding means such as heat embossing / debossing processing, sonic processing and the like.

<Waist overlap part>
Referring to FIG. 6, the rear waist region 14 of the diaper 10 has a waist overlapping portion 30 capable of containing waste such as stool on the side of the waist opening 21 in a worn state. The waist overlapping portion 30 is a band-shaped waistband portion 23 positioned on the skin facing surface and in contact with the wearer's body, an outer wall portion 43 extending upward from the crotch region 15 side, and the waistband portion 23 in the longitudinal direction Z And the outer wall 43, and the waist band 23, the inner wall 42 and the outer wall 43 are arranged to overlap in the front-rear direction Z, and the inner wall 42 and the outer wall It is configured to have a space S with the part 43. The waistband portion 23 and the inner wall portion 42 are continuous via a first bending line 31a extending in the lateral direction X, and the inner wall portion 42 and the outer wall portion 43 are via a second bending line 33a extending in the lateral direction X It is connected. The waist overlapping portion 30 is formed over a predetermined area extending in the lateral direction X around the longitudinal axis P, and can be opened downward (toward the crotch region 15 in the non-wearing state) . The waist overlapping portion 30 is located on the side of the waist opening 21 of the rear waist region 14. Here, "the side of the waist opening 21 of the rear waist region 14" means a region on the outer edge 14b side of a line that bisects the dimension in the longitudinal direction Y of the rear waist region 14.

  In the waist overlapping portion 30, since the inner wall portion 42 and the outer wall portion 43 are not connected by the tuck (having a fold line extending in the longitudinal direction) folded inward, the three-dimensional box-like storage space Is not formed, but when the inner wall 42 is elastically contracted in the lateral direction X, the excrement which has moved between the inner wall 42 and the outer wall 43 to the side of the waist opening 21 of the rear waist region 14 A space S capable of accommodating the Thus, the space S is formed between the inner wall portion 42 and the outer wall portion 43, whereby it is possible to prevent the body from being soiled by highly excrete excrement such as soft stool and body fluid.

  The side seams 19 are located on both sides in the lateral direction X of the waist overlapping portion 30, and the side seams 19 function as junction regions (first junction regions) that close the both sides in the lateral direction X of the space S. The waistband 23, the inner wall 42 and the outer wall 43 forming the waist overlap 30 are joined only at the side seam 19 and not between the side seams 19. In addition, as long as the space S in the waist overlapping portion 30 is defined, the first joining area joining the inner wall 42 and the outer wall 43 is not the side seam 19 joining the both side edges of the diaper 10, but Also, the junction area may be located inside in the lateral direction X.

Absorbent chassis
Referring to FIGS. 3, 4 and 6, the absorbent chassis 12 has a substantially rectangular shape, and is located between the front end 12A, the rear end 12B, and the front end 12A and the rear end 12B. And 12C. The absorbent chassis 12 is located on the skin-facing surface side, and a body-side liner 84 made of a liquid-permeable fibrous nonwoven fabric, a liquid-absorbent absorbent core 85, and a back sheet 86 located on the non-skin-facing surface side. And a back sheet 87. The back sheet 86 is a leakproof sheet formed of a liquid-impervious plastic film covering the entire bottom surface of the absorbent core 85, and the back sheet 87 forms the entire non-skin facing surface of the absorbent chassis 12. It is a liquid-impervious or liquid-impervious coated sheet. The absorbent chassis 12 extends from the rear end edge of the absorbent core 85 to the outside in the longitudinal direction Y, the rear end 84a of the body side liner 84, the rear end 86a of the back sheet 86, and the rear end 87a of the back sheet 87. And an end flap 93 including

  The absorbent core 85 is composed of a core formed of a mixture of fluff pulp and absorbent polymer particles, and a liquid diffusive core cover sheet formed of tissue paper or the like covering the entire core. . The absorbent core 85 extends from the crotch region 15 to the front and rear waist regions 13 and 14, and the rear end 85a of the absorbent core 85 extends to a space S defined by the inner wall 42 and the outer wall 43 ing. As a result, the absorbent core 85 can absorb excrement such as highly flexible soft stool excreted in the space S of the waist overlapping portion 30.

  Both sides of the back sheet 87 are folded inward in the lateral direction X along a bending line (not shown) extending in the longitudinal direction Y, and extend in the longitudinal direction Y between the two sides and the opposing portion thereof. A plurality of string-like or strand-like leg elastic bodies 90 are contractably fixed in the stretched state. The leg elastic body 90 is formed of a plurality of elastic materials spaced apart by a given dimension in the lateral direction X and forms an elastic band having elasticity in a fixed width, so that the leg elastic body 90 is worn around the wearer's leg It can be fitted on the surface to effectively prevent the side leakage of excrement.

<Elastic waist panel>
Referring to FIGS. 3 and 4, the front waist panel 17 has two front waist sheets 50 that define the outer shape of the front waist region 13. The front waist sheet 50 has a main portion 52 in which the front end portion 12A of the absorbent chassis 12 is disposed, and an extending portion 53 positioned on the outer side in the longitudinal direction Y of the main portion 52. The extension 53 is bent inward along a bending line extending in the lateral direction X and is fixed to the main body 52 and the front end 12A of the absorbent chassis 12 disposed on the inner surface of the main body 52. . Between the main portions 52 of the two front waist sheets 50, a plurality of string-like or strand-like front waist elastic bodies 55 extending in the lateral direction X are attached so as to be contractible in an extended state. The front waist elastic body 55 is cut and removed at a central portion in the lateral direction X and overlapping the absorbent core 85 to define a central inelastic region.

  The rear waist panel 18 has a rear waist sheet 60 that defines the outer shape of the rear waist region 14 as shown in FIGS. 3 and 5. The rear waist sheet 60 has a first rear waist sheet 61, and a second rear waist sheet 62 located on the inner surface side of the first rear waist sheet 61 and covering a part of the first rear waist sheet 61.

  In the first and second rear waist sheets 61 and 62, the dimension in the longitudinal direction Y of the first rear waist sheet 61 is larger than the dimension in the longitudinal direction Y of the second rear waist sheet 62. In the state where the second rear waist sheet 62 is disposed on the inner surface, the first rear end and the second outer rear end of the second rear waist sheet 62 extend outward in the longitudinal direction Y, and the first and second portions 2 rear waist seat 61, 62 is the same shape

  The rear waist sheet 60 is formed by joining the first and second rear waist sheets 61, 62, and a main body having areas 60A, 60B, 60C, which will be described later, and a second side extending from the main body in the longitudinal direction Y It has an extension portion 60D formed only from the first rear waist sheet 61, and a plurality of bending lines 31a, 33a, 34a extending in the lateral direction X. The main part of the rear waist sheet 60 is a first area 60A located on the crotch area 15 side, a second area 60B located between the first bending line 31a and the second bending line 33a, and a first area A third area 60C is located between the bending line 31a and the third bending line 34a.

  A plurality of strings or strands are attached to the main part of the rear waist sheet 60 so as to be contractible in an extended state in the lateral direction X between the first rear waist sheet 61 and the second rear waist sheet 62. The waist elastics 63, 64, 65, which are made of elastic material, are arranged. The rear waist elastics 63, 64, 65 are located in the rear lower waist elastic 63 located in the first area 60A of the main body, the inner wall elastic body 65 located in the second area 60B, and the third area 60C. And a band portion elastic body 64. The rear lower waist elastic body 63 is cut and removed at the center in the lateral direction X and overlapping with the absorbent core 85 to define a central inelastic area.

  In the main part of the rear waist panel 18, the first rear waist sheet 61 and the second rear waist sheet 62 are connected via hot melt adhesive applied to one of the facing surfaces of both sheets in various known application patterns. In addition to being bonded together, they can also be bonded together via a hot melt adhesive applied to the entire circumference of each elastic body 63, 64, 65.

  The rear end 12 </ b> B of the absorbent chassis 12 is located on the skin-facing surface of the first area 60 </ b> A of the rear waist sheet 60. The extension portion 60D of the rear waist sheet 60 is bent toward the inner surface of the main portion along the bending line 34a, and is positioned in the main portion and the first area 60A through the hot melt adhesive. It is joined to a part of the rear end 12B.

  The first area 60A has an inelastic portion 66 without an elastic body, which is located between the first bending line 33a and the rear lower waist elastic body 63. The rear end 12 </ b> B of the absorbent chassis 12 is positioned to overlap the inelastic portion 66.

  With reference to FIG. 4, the rear waist sheet 60 is bent along the second bending line 33 a from the crotch region 15 side in a state in which the extension portion 60D is joined to the main portion (mountain fold) first region 60A And the second area 60B face each other, and are further bent along the first bending line 31a (valley fold) so that the second area 60B and the third area 60C face each other Thereby, in the longitudinal cross section, the inelastic portion 66 of the first section 60A and the second and third sections 60B and 60C are folded in a Z shape.

  In such a folded state, the waistband portion 23 of the third area 60C, which extends continuously in the lateral direction X between the side seams 19, by joining overlapping portions in the side seams 19, the second An inner wall 42 composed of the area 60B and an outer wall 43 composed of the inelastic part 66 of the first area 60A are respectively formed. Further, the respective bending portions are formed by the portions bent by the bending lines 31a and 33a, and a space S capable of containing and holding excrement between the inner wall portion 42 and the outer wall portion 43. Is defined.

  In the present embodiment, the rear waist sheet 60 is bent at a plurality of folding lines extending in the lateral direction X to form the waist overlapping portion 30 having the waist band portion 23, the inner wall portion 42 and the outer wall portion 43. Thus, manufacturing cost can be held down by forming by folding the integral waist sheet 60, without forming by combining a separate sheet | seat.

  The method for forming the waist overlapping portion 30 is not limited to this embodiment, and the waist overlapping portion 30 may be formed from a wall portion forming sheet separate from the rear waist sheet 60. That is, the portion of the rear waist panel 18 excluding the waist overlapping portion 30 may be formed of the rear waist sheet 60, and the waist overlapping portion 30 may be formed of a separate wall portion forming sheet. Furthermore, in the wall portion forming sheet, only the waist band portion 23 may be formed from a separate sheet, or the portion excluding the outer wall portion 43 and the waist overlapping portion 30 is formed from the rear waist sheet 60, and from the wall portion forming sheet The waistband portion 23 and the inner wall portion 42 may be formed. Moreover, the waistband part 23, the inner wall part 42, and the outer wall part 43 may be formed from the sheet | seat of another body, respectively.

  In the rear waist region 14, the elastic members 63, 64, 65 are disposed in the rear waist elastic region in which the waist band portion 23, the inner wall portion 42, and the rear lower waist elastic body 63 are disposed. A stretchable elastic zone is formed.

  The thickness of the elastic bodies 63, 64 and 65 can be appropriately adjusted according to the fineness, pitch and expansion ratio of the elastic bodies 63, 64 and 65, and preferably the back lower elastic body 63 The thickness is 310 to 1240 Dtex, the thickness of the band elastic body 64 is 310 to 1240 Dtex, and the thickness of the inner wall elastic body 65 is 310 to 1240 Dtex. More preferably, the thickness of the rear lower elastic body 63 is 470 to 940 Dtex, the thickness of the band elastic body 64 is 470 to 940 Dtex, and the thickness of the inner wall elastic body 65 is 470 to 940 Dtex. Further, regarding the expansion ratio, preferably, the rear lower waist elastic body 63 is 2.0 to 3.5 times, the band elastic body 64 is 1.8 to 3.0 times, and the inner wall elastic body 65 is 1. It is attached to the sheets 61 and 62 in a state of being stretched 8 to 3.0 times.

  Referring to FIG. 5, the dimension (pitch) L3 in the longitudinal direction Y (vertical direction) of the band elastic body 64 in the waist band portion 23 is the dimension (pitch) in the longitudinal direction Y (vertical direction) of the inner wall elastic body 65 in the inner wall 42 Size (pitch) smaller than L4. Specifically, the dimension L3 in the longitudinal direction Y of the band elastic body 64 in the waistband portion 23 is 3.0 to 8.0 mm, and the dimension L4 in the longitudinal direction Y of the inner wall elastic body 65 in the inner wall 42 Is 5.0 to 10.0 mm. Here, the pitch of the elastic bodies 64 and 65 means not the distance between the centers of the elastic bodies 64 and 65 but the dimension between the side edges of the elastic bodies 64 and 65 facing each other.

  On the side of the waist opening 21 of the rear waist region 14, the correlation of the extension stress of the predetermined width in the lateral direction X of the waistband 23, the inner wall 42 and the outer wall 43 is as follows: waistband 23> inner wall 42> outer wall It is 43. In this embodiment, since the inelastic part 66 which does not have the back lower waist elastic body 63 is arrange | positioned in the outer wall part 43 and it does not have elasticity substantially, the inner wall part 42 and the waistband part Elongation stress is lower than 23. Further, in order to make the extension stress of the predetermined width of the waist band portion 23 be higher than that of the inner wall portion 42, the fineness, pitch and stretch ratio of the elastic bodies 64 and 65 may be appropriately adjusted. By making the pitch between the band elastic members 64 smaller than the pitch of the inner wall elastic members 65, the correlation is adjusted. In addition, since the pitch between the band elastics 64 of the waistband 23 is smaller than the pitch between the inner elastics 65 of the inner wall 42, the skin contacts the wearer's skin and the skin contact is good. And it becomes difficult to get rubber marks.

  Here, “the correlation of the extension stress of the predetermined width in the lateral direction X of the waist band portion 23, the inner wall portion 42 and the outer wall portion 43 is“ waist band portion 23> inner wall portion 42> outer wall portion 43 ” In addition to the case where the elastic body is not disposed and not substantially elastic, the case where the elastic action is slightly developed by the contraction action of the rear lower waist elastic body 63 is included.

<Method of measuring extension stress of the waist band portion 23, the inner wall portion 42, and the outer wall portion 43>
For measurement of the extension stress of the waist band portion 23, the inner wall portion 42, and the outer wall portion 43, an autograph tensile tester (for example, AG-1KN1) manufactured by Shimadzu Corporation was used. First, the waistband portion 23 and the inner wall portion 42 in the rear waist region 14 in a state in which the rear waist region 14 of the diaper 10 is extended to the extent that gathers due to the contraction action of the elastic bodies 63, 64, 65 are eliminated. , And the dimensions of the outer wall 43 in the vertical direction (longitudinal direction Y) are measured, and then the waist band 23, the inner wall 42, and the outer wall 43 are cut with the dimensions by a cutter. The waist band portion 23, the inner wall portion 42, and the outer wall portion 43 were cut so as to include the elastic bodies 63, 64, 65, and used as samples. Next, one end of each sample is held by a fixed chuck, and the other end is held by a movable chuck, and expanded to about 90% of the initial dimension at a speed of 300 mm / min and then inverted to about 75% of the initial dimension The tensile load (N) when each sample was shrunk to the size was determined, and converted to stress (N / mm) per unit width (mm) to obtain an elongation stress.

  In general diapers, when the wearer (newborn baby or low-aged infants) operates to lift the legs with the buttocks up from the floor in the supine state, the back waist area of the diaper is from the back A sliding force acts, and the waist opening edge of the rear waist region is lowered downward, and a part of the buttocks may be exposed and the excrement may leak out from the waist opening edge.

  Referring to FIGS. 7 and 8A, in the diaper 10 according to the present embodiment, when the wearer 1 lifts the leg 1b so as to approach the abdomen 1a in a state of supine, the back waist of the diaper 10 A force acts on the area 14 to lower it from the back 1c. In such a state, the waistband portion 23 having a relatively large expansion stress does not slip down, and moves obliquely downward and backward so that the inner wall portion 42 is separated from the waistband portion 23, and the outer wall portion 43 downwardly Moving. In this manner, the waist overlapping portion 30 is deformed in response to the movement of the wearer's body so that the dimension in the longitudinal direction Y (vertical direction) of the rear waist region 14 is expanded, so that the waistband portion 23 is lowered. It is possible to absorb the force to prevent back displacement. Since the waist overlapping portion 30 is deformed so as to be developed while being pulled down as a whole, the bent portion of the second bending line 33a has a gently curved convex shape. In the vicinity of the bending portion of the second bending line 33a, no elastic body is disposed and the rigidity is relatively low and flexible, so that it is likely to be deformed following the movement of the body.

  Next, as shown in FIG. 8 (b), when the posture is changed from the state where the wearer lifts the leg to the state where the leg is pulled down so that the buttocks come in contact with the floor surface, While approaching the portion 23, the waist overlapping portion 30 stands up so as to face the waist band portion 23, and the outer wall portion 43 moves upward and returns (see FIG. 6). As described above, since the inner wall portion 42 can be separated and approached to the waist band portion 23, the rear waist panel 18 expands in the vertical direction Y (vertical direction) according to the change in the posture of the wearer. While being able to be deformed and suppressing a back gap, when a wearer becomes in the original posture, the wearer and the wearing assistant can automatically return to the original state without operation. .

  In the present embodiment, since the correlation of the extension stress of the predetermined width in the lateral direction X is: waist band 23> inner wall 42> outer wall 43, the waist band 23 is stably fitted to the body In addition, since the inner wall portion 42 has lower elasticity than the waistband portion 23, the inner wall portion 42 can be laid diagonally downward and rearward so as to be separated from the waistband portion 23 according to the movement of the wearer.

  The expansion of the dimension in the longitudinal direction Y (vertical direction) of the rear waist region 14 due to the deformation of the waist overlapping portion 30 is not only the movement of the legs of the wearer but also the bending of the body in the lying state of the wearer This also occurs when the wearing assistant holds the wearer and can suppress back displacement.

  Moreover, before and after the deformation of the waist overlapping portion 30, the outer wall 43 approaches the inner wall 42 and the space S becomes smaller because the elastic body is not disposed in the outer wall 43 and is substantially inelastic. There is nothing to lose or to lose. Further, since the end flap 93 which is a part of the rear end 12B of the absorbent chassis 12 is located in the space S, the outer wall 43 is formed of only the sheet member in the lateral direction X, as compared with the case. It has high rigidity. Therefore, even if the waist overlap 30 is deformed or pressure is applied, the dimension of the outer wall 43 in the lateral direction X is not narrowed, and the width of the space S is not reduced. Moreover, while the outer wall portion 43 is formed by the back waist sheet 60 and the back sheets 86 and 87 (including the body side liner 84) of the absorbent chassis 12, the inner wall portion 42 is formed only by the back waist sheet 60 Therefore, the number of sheets forming the outer wall 43 is larger than the number of sheets forming the inner wall 42. Therefore, the rigidity of the outer wall 43 is larger than the rigidity of the inner wall 42, and the inner wall 42 is flexibly deformed according to the movement of the wearer's body, while the outer wall 43 is vertically deformed. Becomes smaller relative to the inner wall portion 42.

  In addition, the sheets constituting the waistband portion 23, the inner wall portion 42, and the outer wall portion 43 are fixed only by the pair of side seams 19 located on both side edges in the lateral direction X. It is fixed. Therefore, the dimension in the lateral direction X in which the inner wall portion 42 can be deformed can be made as large as possible.

  Furthermore, since the end flap 93 has the liquid-impervious or liquid-impervious back sheet 86, 87, it is possible to suppress leakage of highly mobile excrement that has moved to the space S. Further, in the present embodiment, not only the end flap 93 but also the rear end portion 85a of the semi-rigid absorbent core 85 having rigidity higher than that of the sheet member is located in the space S. Can be further suppressed, and excrement that has moved into the space S can be sufficiently absorbed.

  As described above, in the diaper 10 according to the present embodiment, the size in the vertical direction of the rear waist region 14 can be expanded according to the posture of the wearer to suppress back displacement and move toward the waist opening Since the highly fluid excrement can be stored and held in the waist overlap 30, it is possible to prevent the back from being soiled by the excrement.

  Again referring to FIG. 2, the upper end edge (front waist opening edge) 13 b of the front waist region 13 is located below the upper edge (rear waist opening edge) 14 b of the rear waist region 14. With the diaper 10 unfolded and pulled in the longitudinal direction Y and the transverse direction X, the separation dimension from the horizontal axis Q to the outer edge 13 b of the front waist region 13 and the outer edge of the rear waist region 14 from the horizontal axis Q Although the separation dimension to 14 b is substantially the same, in the rear waist region 14, the inner wall portion 42 contracts and becomes oblique with respect to the waist band portion 23 so that the waist band portion 23 is pulled upward and upward It has a convexly curved shape. Therefore, it is considered that the outer edge 14 b of the rear waist region 14 extends upward above the outer edge 13 b of the front waist region 13. When the baby 10 wears the diaper 10, the outer edge 13b of the front waist region 13 is relatively low, so the umbilical part of the wearer is exposed, and the umbilical part touches the front waist region 13 to feel discomfort. You can suppress the stimulation.

Second Embodiment
FIG. 9 is a developed plan view similar to FIG. 3 of the diaper 10 according to the second embodiment. The basic configuration aspect of the diaper 10 according to the present embodiment is the same as that of the first embodiment, and different configurations will be described below.

  A second fixed area 97 (a hatched portion in FIG. 9) is positioned between a pair of side seams 19 which is a first fixed area joining the waistband portion 23, the inner wall portion 42 and the outer wall portion 43 to each other. doing.

  The second fixing area 97 joins the inner wall 42 and the outer wall 43 to each other by an adhesive such as a hot melt adhesive, for example. The dimension L1 in the lateral direction X of the pair of side seams 19 is larger than the dimension L2 in the lateral direction X of the pair of second fixed regions 97, and the second fixation region 97 is positioned inward of the pair of side seams 19 There is. The second fixing area 97 does not have to be formed of an adhesive, and can be formed, for example, by using a welding method such as heat sealing or sonic.

  Since the second fixed area 97 joins the inner wall 42 and the outer wall 43, the dimension in the lateral direction X of the space S of the waist overlapping portion 30 is reduced. The second fixed area 97 is located outside of the back sheet 86 in the lateral direction X. For this reason, the dimension in the lateral direction X of the space S for containing excrement such as soft stools is narrowed, and is substantially limited to the area overlapping the existing area of the absorbent chassis 12, but both sides of the absorbent chassis 12 in the space S The excrement stored in the space S can be suppressed from leaking out to the crotch region 15 side from the opening located at the

  In the lateral direction X, the waistband 23 and the inner wall 42 are not fixed between the side seam 19 and the second fixed area 97 which are the first fixed area, and the inner wall 42 and the outer wall 43 are Since the rear waist region 14 is not fixed, it is possible to prevent the rear waist region 14 from being reduced in touch by the adhesive and increased in rigidity.

  In addition, the diaper 10 which does not arrange | position elastic body 63,64,65 in the outer wall part 43 was demonstrated to the said embodiment. However, the present invention is not limited thereto, and an elastic body may be disposed on the outer wall 43. Even in this case, it is preferable that the correlation of the extension stress in the lateral direction X be: waist band portion 23> inner wall portion 42> outer wall portion 43.

  With respect to each constituent material constituting the diaper 10 of the present invention, various known materials generally used in this type of field can be used without limitation, unless otherwise specified. Moreover, although the diaper 10 comprised from three panels of the front waist panel 17, the back waist panel 18, and the absorptive chassis 12 was illustrated in this specification as a basic structure of the diaper 10, back and front waist area 13, 14 And the crotch area 15 may be constituted by a continuous panel. Moreover, in the non-wearing state, not the pull-on type diaper in which the side edges of the front and rear waist areas 13 and 14 are connected but in the non-wearing state, the side edges of the front and back waist area are not connected. It may be an open type diaper that connects the two side edges with tape fasteners when wearing one, while in the non-wearing state, one side in the transverse direction X is connected while the other is open and worn Sometimes it may be an open type diaper in which the other in the lateral direction X is connected by a tape fastener. Moreover, terms such as "first" to "second" used in the present specification are used merely to distinguish similar elements, positions and the like.

10 Disposable diapers (disposable items)
12 Absorbent chassis 12B rear end 13 front waist area 13b upper end edge (rear waist opening edge of rear waist area)
14 back waist area 14b top edge (front waist opening edge of back waist area)
15 crotch area 19 side seam (first fixed area)
21 waist opening 23 waist band portion 30 waist overlapping portion 31 a first bending line (first bending portion)
33a second bending line (second bending portion)
42 inner wall portion 43 outer wall portion 61 first rear waist sheet 62 second rear waist sheet 63 rear lower waist elastic body 64 band portion elastic body 65 inner wall elastic body 85 absorbent core 86 back sheet (leakage leakage sheet)
87 Back sheet (coated sheet)
90 leg elastic body 97 second fixing area L1 lateral dimension L2 of the first fixing area lateral dimension L2 of the second fixing area L3 longitudinal dimension of the band elastic body L4 longitudinal direction of the inner wall elastic body Dimension S Space X Horizontal Y Vertical (Vertical)
Z longitudinal direction

Claims (9)

In the wearing state, it has vertical and horizontal directions, and an anteroposterior direction intersecting the vertical and horizontal directions, and the skin opposing surface and the non-skin opposing surface, the front waist region, the rear waist region, and the front and rear regions A disposable wearable article comprising a crotch area located between waist areas and an absorbent chassis extending from said crotch area to said front and rear waist areas,
The rear waist region includes a waist band portion located on the skin facing surface and extending in the lateral direction, an outer wall portion extending upward from the crotch region side, the waist band portion and the outer wall portion in the front and rear direction, And an inner wall portion having elastic stretchability in the lateral direction,
In a state where the inner wall is contracted in the lateral direction by the elastic stretchability of the inner wall, the waistband and the inner wall face each other, and the inner wall and the outer wall face each other so that the inner wall is opposed. A space is defined between the wall and the outer wall,
The rear end portion of the absorbent chassis has a liquid-impervious or liquid-impervious back sheet and extends inside the space on the inner surface of the outer wall portion,
A wearing article characterized in that the extension stress in the lateral direction of the outer wall part is smaller than the extension stress in the lateral direction of the inner wall part.   The rear waist region is formed by a sheet, and the first bent portion extending between the waist band portion and the inner wall portion and extending in the lateral direction by bending the sheet, the inner wall portion and the outer wall portion The wear article according to claim 1, wherein the laterally extending second bent portion, the waistband portion, the inner wall portion, and the outer wall portion are formed therebetween.   The rear waist region includes a wall forming sheet, and the first bending part extending in the lateral direction is positioned between the waist band and the inner wall by bending the wall forming sheet, The worn article according to claim 1, wherein the waist band portion and the inner wall portion are formed. The waistband portion has elastic stretchability in the lateral direction,
The correlation between the extensional stress in the lateral direction of the waist band portion, the inner wall portion, and the outer wall portion is: waist band portion> the inner wall portion> the outer wall portion according to any one of claims 1 to 3. Wearing items. The absorbent chassis has an absorbent core extending from the crotch area to the front and rear waist areas,
The wearing article according to any one of claims 1 to 4, wherein the absorbent core extends to the inside of the space between the inner wall and the outer wall.   The wearing article according to any one of claims 1 to 5, wherein in a natural state, a waist opening edge of the front waist region is positioned lower than a waist opening edge of the rear waist region.   The wearing article according to any one of claims 1 to 6, wherein the outer wall portion is not provided with an elastic body extending in a contractable manner in the lateral direction. The rear waist region includes a pair of first fixing regions respectively joining the waistband portion, the inner wall portion and the outer wall portion, and a pair of second fixing regions respectively joining the inner wall portion and the outer wall portion. Have and
The lateral dimension of the first fixation zone is greater than the lateral dimension of the second fixation zone;
The wearing article according to any one of claims 1 to 7, wherein the second fixing area is located inside the first fixing area. A plurality of elastic bodies extending in a contractable manner in the lateral direction are disposed on the waist band portion and the inner wall portion,
The wearing article according to any one of claims 1 to 8, wherein the dimension in the vertical direction of the elastic body in the waist band portion is smaller than the dimension in the vertical direction of the elastic body in the inner wall portion.

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