CN110709041B - Wearing article - Google Patents

Abstract

The wearing article (10) comprises a front waist region (13), a rear waist region (14), a crotch region (15) located between the front and rear waist regions, and an absorbent chassis (12) extending from the crotch region (15) to the front and rear waist regions. The rear waist region has: a waist band (23) located on the skin-facing side and extending in the transverse direction (X); an outer wall (43) extending laterally upward from the crotch region; an inner wall (42) located between the waist belt and the outer wall in the front-back direction (Z) and having elastic stretchability in the transverse direction. In a state where the inner wall is contracted in the lateral direction due to the elastic stretchability of the inner wall, the waist band is opposed to the inner wall, and the inner wall is opposed to the outer wall, thereby defining a space (S) between the inner wall and the outer wall. The rear end portion (12B) of the absorbent chassis has a liquid-impermeable or liquid-impermeable back sheet (86) and extends into the space on the inner surface of the outer wall. The elongation stress of the outer wall in the transverse direction is smaller than the elongation stress of the inner wall in the transverse direction (X).

Description

Wearing article

Technical Field

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

Background

Conventionally, the following diapers are known: the absorbent article has a vertical direction and a horizontal direction, a front-back direction intersecting the vertical direction, a skin-facing surface and a non-skin-facing surface, an inner surface facing the body of the wearer, and an outer surface on the opposite side of the inner surface, and includes a front waist region, a rear waist region, a crotch region located between the front waist region and the rear waist region, and an absorbent chassis extending from the crotch region to the front waist region and the rear waist region.

For example, the front waist region of the diaper disclosed in patent document 1 has a belt-like waist-enlarged portion on the non-skin-facing side of the waist opening.

The waist-enlarged portion extends in a belt-like shape in the transverse direction to both side edges of the rear waist region and has: a waist band located on the skin-facing side and extending in the transverse direction; an outer wall on a non-skin facing side; and an inner wall located between the waist belt and the outer wall in the front-rear direction.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2011-189068

Disclosure of Invention

The wearing article disclosed in patent document 1 can enlarge the length dimension of the rear waist region by the wearer pulling up while gripping the waist band. Therefore, even when the rear waist region is pulled down by, for example, arching the back of the wearer or raising the legs in a supine state, the back of the wearer can be covered by pulling up the waist band.

Further, since the waist band is formed with a plurality of gathers, there is a possibility that excrement may leak out through the skin from the gaps between the gathers, and if a space capable of accommodating excrement is formed between the inner wall and the outer wall of the waist enlarged portion at this time, leakage to the outside can be suppressed. However, since the outer wall has the elastic body extending in the lateral direction, the outer wall approaches the inner wall by the contraction action of the elastic body, and a space capable of accommodating excrement cannot be formed between the inner wall and the outer wall. There are also the following problems: when the waist-enlarging portion is gripped and pulled up by a third person or user such as mother, the waist-enlarging portion can be restored to its original state only by applying a force from the outside.

The present invention provides a wearing article which has a portion capable of accommodating and holding excrement moving toward a waist opening side while suppressing back displacement (displacement of a rear waist region with respect to the back), can deform in accordance with a change in posture of a wearer, and can return to an original state after the posture of the wearer returns to the original state.

In order to solve the above problem, the present invention is directed to a wearing article having a vertical direction, a lateral direction, and a front-back direction intersecting the vertical direction and the lateral direction in a worn state, the wearing article including: skin-facing and non-skin-facing surfaces; 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 back waist regions.

The rear waist region of the present invention has: a pocket structure located on the skin-opposing side and extending in the transverse direction; an outer wall extending laterally upward from the crotch region; and an inner wall that is located between the bag structure and the outer wall in the front-rear direction and has elastic stretchability in the transverse direction, the bag structure being opposed to the inner wall and the inner wall being opposed to the outer wall in a state where the inner wall is contracted toward the transverse direction due to the elastic stretchability of the inner wall so as to define a space between the inner wall and the outer wall, a rear end portion of the absorbent substrate having a liquid-impermeable or liquid-impermeable back sheet and extending to the inside of the space on an inner surface of the outer wall, an elongation stress of the outer wall in the transverse direction being smaller than an elongation stress of the inner wall in the transverse direction.

The rear waist region is formed by a sheet, formed by folding the sheet: a 1 st bend located between the pocket structure and the inner wall and extending in the transverse direction, a 2 nd bend located between the inner wall and the outer wall and extending in the transverse direction, the pocket structure, the inner wall, and the outer wall. Accordingly, the pocket structure, the inner wall, and the outer wall can be formed by folding the sheet constituting the rear waist region, and therefore, it is not necessary to fix the plurality of sheets with the adhesive, and it is possible to prevent the deterioration of the skin feel of the sheet due to the curing of the adhesive.

The rear waist region has a wall forming sheet formed by folding the wall forming sheet: a 1 st fold between the pocket structure and the inner wall and extending in a transverse direction, the pocket structure, and the inner wall. Thus, by fixing the inner wall and the outer wall, a space for accommodating excrement can be easily formed.

The bag structure has elastic elasticity in the transverse direction, and the elongation stress of the bag structure, the inner wall and the outer wall in the transverse direction is related to: the bag structure is larger than the inner wall and the outer wall. This makes it possible to suppress the position of the rear waist region from being displaced with respect to the back of the wearer because of the large extension stress of the bag structure, and to suppress the space for containing excrement from becoming small because of the small extension stress of the outer wall.

The absorbent chassis has a liquid-absorbent core extending from the crotch region to the front and rear waist regions, the liquid-absorbent core extending into the space between the inner and outer walls. Thus, when excrement such as loose stools is discharged into the space between the inner wall and the outer wall, the excrement can be absorbed by the liquid-absorbent core.

In the unworn state, the waist opening edge of the front waist region is located below the waist opening edge of the rear waist region. Thus, when the infant wears the diaper, the upper end edge of the front waist region is positioned at a relatively low position, and therefore the umbilical region of the wearer is exposed, and the occurrence of discomfort or irritation due to the umbilical region contacting the front waist region can be suppressed.

The outer wall is not provided with an elastic body that extends in a laterally contractible manner. This makes it possible to suppress the space between the inner wall and the outer wall from becoming small, to deform the inner wall in accordance with the posture of the wearer due to the elastic stretchability of the inner wall, and to return to the original state after the posture of the wearer returns to the original state.

The rear waist region has: a pair of 1 st fixing regions joining the bag structure, the inner wall and the outer wall to each other, respectively; and a pair of 2 nd fixing regions joining the inner wall and the outer wall to each other, a transverse dimension of the 1 st fixing region being larger than a transverse dimension of the 2 nd fixing region, the 2 nd fixing region being located inside the 1 st fixing region. This can reduce the lateral dimension of the space between the inner wall and the outer wall, and can prevent the excrement in the space from being discharged to the outside.

A plurality of elastic bodies extending in a contractible manner in the transverse direction are arranged on the bag structure and the inner wall, and the dimension of the elastic body in the up-down direction at the bag structure is smaller than the dimension of the elastic body in the up-down direction at the inner wall. This makes it possible to easily increase the elongation stress of the bag structure with respect to the elongation stress of the inner wall.

Effects of the invention

According to the wearing article of the present invention, the deformation can be caused in accordance with the posture of the wearer by the elastic stretchability of the inner wall, and the wearing article can be restored to the original state after the posture of the wearer is returned to the original posture. Further, the rear waist region is enlarged in the vertical direction, so that the back displacement can be suppressed, and the extension stress of the outer wall in the lateral direction is smaller than the extension stress of the inner wall in the lateral direction, so that the space between the inner wall and the outer wall can be suppressed from being made smaller by the contraction force of the outer wall, and the space for containing excrement can be maintained.

Drawings

The drawings illustrate specific embodiments of the invention, not just the structures essential to the invention, but also alternative and preferred embodiments.

Fig. 1 is a perspective view of a diaper according to embodiment 1 as an example of a wearing article of the present invention, viewed from the back side.

Fig. 2 is a plan view of the diaper in an unworn state, as viewed from the front.

Fig. 3 is a partially cut-away developed view of the diaper in a state where each elastic body is extended in the transverse direction and the longitudinal direction of the diaper.

Fig. 4 is an exploded perspective view of the diaper.

Fig. 5 is a developed view of the rear waist panel.

Fig. 6 is a sectional view taken along line VI-VI in fig. 1.

Fig. 7 is a cross-sectional view similar to fig. 6 in a state where the inner wall and the outer wall in the rear waist region are deformed.

Fig. 8 (a) is a side view of the diaper when the wearer lifts his or her legs in the supine position. Fig. 8 (b) is a side view of the diaper when the wearer extends his legs in the supine position.

Fig. 9 is a view similar to fig. 3 of the diaper of embodiment 2.

Detailed Description

A pants-type disposable diaper (pull-on diaper) 10 shown as an example of a wearing article of the present invention includes: a longitudinal direction Y; a transverse direction X; a front-rear direction Z as a thickness direction intersecting the longitudinal direction Y and the lateral direction X; a longitudinal axis P extending in the longitudinal direction Y and bisecting the dimension 2 in the transverse direction X of the disposable diaper 10; and a transverse axis Q extending in the transverse direction X and bisecting the dimension 2 in the longitudinal direction Y of the disposable diaper 10.

Fig. 1 shows a diaper 10 worn by a wearer, and the body of the wearer is omitted for convenience of explanation. Referring to fig. 1-3, a diaper 10 includes: a skin-facing surface and a non-skin-facing surface opposite thereto; an annular elastic waist panel 11 extending in the waist-surrounding direction; an absorbent chassis 12 joined to the elastic waist panel 11; 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 to be symmetrical about a longitudinal axis P. The elastic waist panel 11 is composed of 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 a laterally long rectangular shape defined by: a lower edge 13a extending in the transverse direction X; an upper end edge (front waist opening edge) 13b extending in the lateral direction X so as to face the lower end edge 13a in the longitudinal direction Y; and two side edges 13c extending in the longitudinal direction Y between the lower end edge 13a and the upper end edge 13 b.

Likewise, the rear waist region 14 has a shape defined by: a lower end edge 14a extending in the lateral direction X; an upper end edge (front and rear waist opening edges) 14b extending in the transverse direction X so as to face the lower end edge 14a in the longitudinal direction Y; two side edges 14c extending downward from the upper edge 14 b; and two concave curved edges 14d between the side edges 14c and the lower end edge 14 a.

Both side edges 13c of the front waist region 13 and both side edges 14c of the rear waist region 14 are overlapped with each other and joined by side seams 19 intermittently extending in the longitudinal direction Y to form both side edge portions of the diaper 10, and define a waist opening 21 and a pair of leg openings 22. The side seams 19 are realized by known bonding means, for example, various known thermal welding means such as hot embossing and ultrasonic processing.

< bag construction >

Referring to fig. 6, the rear waist region 14 of the diaper 10 has a bag structure 30 capable of containing excrement such as feces on the waist opening 21 side in a worn state. The bag structure 30 includes: a waist band 23 opposite the wearer's body; an outer wall 43 extending laterally upward from the crotch region 15; and an inner wall 42 located between the waist belt 23 and the outer wall 43 in the front-rear direction Z, the waist belt 23, the inner wall 42 and the outer wall 43 having an arrangement relationship extending in the transverse direction X and overlapping in the front-rear direction Z, respectively, and defining a space S between the inner wall 42 and the outer wall 43. The waist belt 23 is connected to the inner wall 42 via the 1 st bending line 31a extending in the transverse direction X, and the inner wall 42 is connected to the outer wall 43 via the 2 nd bending line 33a extending in the transverse direction X. The pocket structure 30 is formed over a predetermined area extending in the lateral direction X about the longitudinal axis P, and can open toward the crotch region 15. The pocket structure 30 is located at the waist opening 21 side of the rear waist region 14. Here, the "waist opening 21 side of the rear waist region 14" means a region closer to the upper end edge 14b than a line bisecting the dimension in the longitudinal direction Y of the rear waist region 14 by 2.

The pouch structure 30 is not formed by joining both side portions of the inner wall 42 and the outer wall 43 by a tuck seam folded inward, but is formed by elastically contracting the inner wall 42 in the transverse direction X, so that a space S capable of accommodating excrement moved to the waist opening 21 side of the rear waist region 14 is formed between the inner wall 42 and the outer wall 43. This can prevent the body from being contaminated with excrement having high fluidity such as loose stools and bodily fluids.

The side seams 19 are located on both sides of the bag structure 30 in the transverse direction X, and the side seams 19 also function as joining regions (1 st joining region) that close both sides of the space S in the transverse direction X. The waist belt 23, the inner wall 42 and the outer wall 43 forming the pouch structure 30 are joined to each other only at the side seams 19, and are not joined to each other between the side seams 19. If the space S in the bag structure 30 can be defined, the 1 st joining region joining the inner wall 42 and the outer wall 43 may be positioned at another position inside the lateral direction X than the side seam 19, instead of being doubled by the side seam 19 (which joins both side edges of the diaper 10).

< absorbent substrate >

Referring to fig. 3, 4, and 6, the absorbent chassis 12 is substantially rectangular, and has a front end portion 12A, a rear end portion 12B, and an intermediate portion 12C located between the front end portion 12A and the rear end portion 12B. The absorbent chassis 12 has: a body-side liner 84 made of a liquid-permeable fibrous nonwoven fabric and located on the skin-facing surface side; the liquid-absorbent core 85; and base sheets 86, 87 on the non-skin-facing side. The back sheet 86 is formed of a liquid-impermeable plastic film covering the entire bottom surface of the liquid-absorbent core 85 and has leakage preventing properties, and the back sheet 87 has liquid-impermeable or liquid-impermeable properties and covers the entire non-skin-facing surface of the absorbent substrate 12. The absorbent chassis 12 further has an end flap 93 extending outward in the longitudinal direction Y from the rear end edge of the liquid-absorbent core 85, the end flap 93 including the rear end portion 84a of the body-side liner 84, the rear end portion 86a of the back sheet 86, and the rear end portion 87a of the back sheet 87.

The liquid-absorbent core 85 is constituted by, for example: a core formed from a mixture of fluff pulp and absorbent polymer particles; and a liquid-diffusing core material covering sheet formed of a thin paper covering the entire core material. The liquid-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 liquid-absorbent core 85 extends to the space S defined by the inner wall 42 and the outer wall 43. This allows the liquid-absorbent core 85 to absorb excrement such as loose stool having high fluidity discharged into the space S of the bag structure 30.

Both side portions of the back sheet 87 are folded inward in the lateral direction X along a folding line (not shown) extending in the longitudinal direction Y, and a plurality of linear or band-shaped leg elastic bodies 90 extending in the longitudinal direction Y are fixed so as to be contractible in an extended state between the both side portions and portions opposed thereto. The leg elastic members 90 are made of a plurality of elastic materials arranged at predetermined intervals in the lateral direction X, and form elastic regions having a predetermined width. Therefore, the leg band of the wearer is fitted in a planar manner in the worn state, and the leakage of the excrement from the side is effectively prevented.

< elastic waist panel >

Referring to fig. 3 and 4, the front waist panel 17 includes 2 front waist panels 50 forming the front waist region 13. The front waist sheet 50 has: a main body 52 for disposing the front end 12A of the absorbent chassis 12; and an extension 53 located outside the body portion 52 in the longitudinal direction Y. The extended portion 53 is bent inward along a bend line extending in the lateral direction X and is fixed to the main body portion 52 and the front end portion 12A of the absorbent chassis 12 disposed on the inner surface of the main body portion 52. A plurality of linear or belt-like front waist elastic members 55 extending in the transverse direction X are fixed so as to be contractible in an extended state between the main body portions 52 of the 2 front waist sheets 50. The front waist panel 17 is divided into a central inelastic region by cutting away a portion of the front waist elastic 55 that overlaps the liquid-absorbent core 85 located at the center in the transverse direction X.

As shown in fig. 3 and 5, the rear waist panel 18 includes a rear waist panel 60 forming the rear waist region 14. The rear waist panel 60 includes: the 1 st rear waist panel 61; and a 2 nd rear waist panel 62 covering a portion of the 1 st rear waist panel 61 on an inner surface of the 1 st rear waist panel 61.

With respect to the 1 st and 2 nd rear waist panels 61 and 62, the dimension in the longitudinal direction Y of the 1 st rear waist panel 61 is larger than the dimension in the longitudinal direction Y of the 2 nd rear waist panel 62, and in a state where the 2 nd rear waist panel 62 is disposed on the inner surface of the 1 st rear waist panel 61, the 1 st rear waist panel 61 extends outward in the longitudinal direction Y than the upper end edge of the 2 nd rear waist panel 62, and the 1 st and 2 nd rear waist panels 61 and 62 have the same shape except for the extended portion.

The rear waist panel 60 is formed by joining a 1 st rear waist panel 61 and a 2 nd rear waist panel 62, and has the following portions: a main body portion having regions 60A, 60B, and 60C described later; an extension portion 60D extending outward in the longitudinal direction Y from the main body portion and formed only by the 1 st rear waist panel 61; and a plurality of doglegs 31a, 33a, 34a extending in the transverse direction X. The main body portion of the rear waist panel 60 has: the 1 st region 60A on the crotch region 15 side; a 2 nd region 60B located between the 1 st broken line 31a and the 2 nd broken line 33 a; and a 3 rd region 60C located between the 1 st zigzag line 31a and the 3 rd zigzag line 34 a.

A plurality of linear or belt-like rear waist elastic bodies 63, 64, 65 made of an elastic material are arranged in the main body portion of the rear waist panel 60, and the rear waist elastic bodies 63, 64, 65 are contractibly fixed between the 1 st rear waist panel 61 and the 2 nd rear waist panel 62 in a state of being stretched in the lateral direction. The rear waist elastic bodies 63, 64, 65 have: a lower-rear waist elastic body 63 located in the 1 st region 60A of the main body; an inner wall elastic body 65 located at the 2 nd region 60B; and a belt elastic body 64 located at the 3 rd region 60C. The rear lower waist elastic member 63 is cut away at the center in the transverse direction X and at a portion overlapping the liquid-absorbent core 85, thereby defining a central inelastic region.

In the main body portion of the rear waist panel 18, the 1 st and 2 nd rear waist panels 61 and 62 can be joined together by hot melt adhesive applied to the facing surfaces of one of the two panels in various known application patterns, and in addition, can be joined together by hot melt adhesive applied to the entire circumference of the elastic bodies 63, 64, and 65.

The rear end portion 12B of the absorbent chassis 12 is positioned on the skin-facing side of the 1 st region 60A of the rear waist panel 60. The extended portion 60D of the rear waist panel 60 is folded along the folding line 34a toward the inner surface of the main body, and is joined to the main body and a portion of the rear end portion 12B of the absorbent chassis 12 located in the 1 st region 60A by means of a hot melt adhesive.

The 1 st region 60A has a non-elastic portion 66 where no elastic body is disposed, and the non-elastic portion 66 is located between the 1 st zigzag line 33a and the rear lower waist elastic body 63. The rear end portion 12B of the absorbent chassis 12 overlaps with the inelastic portion 66.

Referring to fig. 4, in a state where the extension portion 60D is joined to the main body portion, the rear waist panel 60 is folded (mountain-folded) along the 2 nd folding line 33a from the crotch portion 15 side so that the 1 st region 60A and the 2 nd region 60B face each other, and further folded (valley-folded) along the 1 st folding line 31a so that the 2 nd region 60B and the 3 rd region 60C face each other, whereby the inelastic portion 66, the 2 nd region 60B, and the 3 rd region 60C of the 1 st region 60A are folded in a zigzag shape in the vertical cross section.

In the thus folded state, the portions overlapping each other at the side seams 19 are joined, thereby respectively forming the following regions extending continuously in the lateral direction X between the side seams 19: a waist band 23 comprised of the 3 rd region 60C, an inner wall 42 comprised of the 2 nd region 60B, and an outer wall 43 comprised of the inelastic portion 66 of the 1 st region 60A. In addition, each of the bent portions is formed by the bent portions 31a and 33a, and a space S capable of accommodating and holding excrement is defined between the inner wall 42 and the outer wall 43.

In the present embodiment, the pouch structure 30 having the waist band 23, the inner wall 42 and the outer wall 43 is formed by folding the rear waist panel 60 at a plurality of folding lines extending in the transverse direction X. In this way, it is not necessary to form a bag structure by combining separate sheets, and the waist sheet 60 can be formed by bending integrally, so that the manufacturing cost can be suppressed.

The method of forming the pocket structure 30 is not limited to the present embodiment, and the pocket structure 30 may be formed by a wall forming sheet separate from the rear waist panel 60. That is, the rear waist panel 60 may form a portion of the rear waist panel 18 other than the pocket structure 30, and the pocket structure 30 may be formed by a wall-forming sheet separate from the rear waist panel 60. In addition, in the wall forming sheet, only the waist belt 23 may be formed of a separate sheet, and the outer wall 43 and a portion other than the pouch structure 30 may be formed of the rear waist sheet 60 and the waist belt 23 and the inner wall 42 may be formed of the wall forming sheet. Further, the waist belt 23, the inner wall 42 and the outer wall 43 may be formed of separate pieces.

In the rear waist region 14, elastic bodies 63, 64, 65 are arranged in the waist band 23, the inner wall 42, and the rear waist elastic region in which the rear lower waist elastic body 63 is arranged, thereby forming an elastic region that can expand and contract in the lateral direction X.

The thicknesses of the elastic bodies 63, 64, 65 can be appropriately adjusted by the thicknesses, pitches, and extension ratios of the elastic bodies 63, 64, 65, and it is preferable that the thickness of the rear lower waist elastic body 63 is 310 to 1240dtex, the thickness of the belt elastic body 64 is 310 to 1240dtex, and the thickness of the inner wall elastic body 65 is 310 to 1240 dtex. More preferably, the thickness of the rear lower waist elastic body 63 is 470 to 940dtex, the thickness of the belt elastic body 64 is 470 to 940dtex, and the thickness of the inner wall elastic body 65 is 470 to 940 dtex. In addition, the stretch ratio is preferably fixed to the sheets 61 and 62 in a state where the rear lower waist elastic body 63 is stretched 2.0 to 3.5 times, the belt elastic body 64 is stretched 1.8 to 3.0 times, and the inner wall elastic body 65 is stretched 1.8 to 3.0 times.

Referring to fig. 5, the dimension (pitch) L3 in the longitudinal direction Y (up-down direction) of the belt elastic body 64 at the waist belt 23 is smaller than the dimension (pitch) L4 in the longitudinal direction Y (up-down direction) of the inner wall elastic body 65 at the inner wall 42. Specifically, the dimension L3 in the longitudinal direction Y of the belt elastic body 64 at the waist belt 23 is 3.0 to 8.0mm, and the dimension L4 in the longitudinal direction Y of the inner wall elastic body 65 at the inner wall 42 is 5.0 to 10.0 mm. Here, the pitch of the elastic bodies 64 and 65 does not mean a distance between the centers of the elastic bodies 64 and 65, but means a dimension between side edges of the elastic bodies 64 and 65 adjacent to and facing each other.

The elongation stress of the waist belt 23, the inner wall 42 and the outer wall 43 at a predetermined width in the transverse direction X in the rear waist region 14 on the waist opening 21 side has the following relationship: the waist belt 23 is larger than the inner wall 42 and larger than the outer wall 43. In the present embodiment, the inelastic portion 66 having no rear lower waist elastic 63 (fig. 3) is located in the outer wall 43, and has substantially no elasticity, and the outer wall 43 has a lower extension stress than the inner wall 42 and the waist band 23. In order to make the elongation stress of the predetermined width of the waist belt 23 higher than the elongation stress of the predetermined width of the inner wall 42, the thicknesses, pitches, and elongation ratios of the elastic bodies 64, 65 may be appropriately adjusted, and in the present embodiment, the above-described correlation is established by adjusting the pitch between the belt elastic bodies 64 to be smaller than the pitch between the inner wall elastic bodies 65. As described above, the distance between the belt elastic bodies 64 of the waist belt 23 is smaller than the distance between the inner wall elastic bodies 65 of the inner wall 42, so that the waist belt 23 is in surface contact with the skin of the wearer, and the skin feel is good, and the rubber mark is less likely to be drawn.

Here, the "relation of the elongation stress of the specified width in the transverse direction X of the waist band 23, the inner wall 42, and the outer wall 43 is: the term "waist belt 23 > inner wall 42 > outer wall 43" includes not only the case where the outer wall 43 has no elastic body and has substantially no elasticity, but also the case where the elasticity is slightly developed by the contraction action of the rear lower waist elastic body 63.

< method for measuring elongation stress of waist band 23, inner wall 42 and outer wall 43 >

The elongation stress of the waist belt 23, the inner wall 42 and the outer wall 43 was measured by using an autograph type tensile tester (for example, AG-1 KN1) manufactured by Shimadzu corporation. First, the vertical dimension (longitudinal direction Y) of the waist belt 23, the inner wall 42, and the outer wall 43 in the rear waist region 14 was measured in a state where the rear waist region 14 of the diaper 10 was stretched to such an extent that the gathers formed by the contraction action of the elastic bodies 63, 64, and 65 on the surface thereof disappeared, and then the waist belt 23, the inner wall 42, and the outer wall 43 were cut by a cutter in accordance with the respective dimensions, and the waist belt 23, the inner wall 42, and the outer wall 43 were cut out from the rear waist region 14 in a state where the elastic bodies 63, 64, and 65 were fixed, to obtain a sample. Next, one end of each sample was clamped to a fixed chuck, the other end was clamped to a movable chuck, the sample was stretched to a size of about 90% of the initial size at a speed of 300 mm/min and then inverted, and a tensile load (N) when each sample was contracted to a size of about 75% of the initial size was obtained as an elongation stress in terms of a stress (N/mm) per unit width (mm).

In a typical diaper, when a wearer (a newborn or a small-aged infant) lifts his or her legs while leaving their buttocks on the ground in a supine position, a force to slide down the back acts on the rear waist region of the diaper, and the waist opening edge of the rear waist region slides down, so that, for example, a part of the buttocks may be exposed and excrement may leak from the waist opening edge.

Referring to fig. 7 and 8 (a), in the diaper 10 of the present embodiment, when the wearer 1 lifts the legs 1b to approach the abdomen 1a while lying on his/her back, a force is applied to the rear waist region 14 of the diaper 10 to slide down from the back 1 c. In this state, the lumbar belt 23 having a relatively large extension stress does not slip down, but the inner wall 42 moves obliquely downward and rearward away from the lumbar belt 23, and the outer wall 43 moves downward. As described above, the pocket structure 30 is deformed so that the size of the rear waist region 14 in the longitudinal direction Y (vertical direction) increases in accordance with the body movement of the wearer, and absorbs the force of the waist band 23 trying to slip down, thereby suppressing the back displacement. The bag structure 30 is deformed so as to be stretched while being pulled down as a whole, and the bent portion of the 2 nd fold line 33a is formed into a convex curved surface shape which is gently curved. In the vicinity of the bent portion of the 2 nd bending line 33a, an elastic body is not disposed, and the rigidity is relatively low and the flexibility is low, so that the deformation is likely to follow the body motion.

Next, as shown in fig. 8 (b), when the wearer changes posture from the leg-up state to the leg-down state so that the buttocks contact the ground, the inner wall 42 approaches the waistband 23 to be in a state where the bag structure 30 is raised so as to face the waistband 23, and the outer wall 43 moves upward and returns (see fig. 6). As described above, the inner wall 42 can move away from and toward the waist belt 23, and therefore the rear waist panel 18 can be deformed so as to expand in the longitudinal direction Y (vertical direction) in accordance with a change in the posture of the wearer, so that the back displacement is suppressed, and the wearer can automatically return to the original state without being operated by the wearer and the wearer-assistant when returning to the original posture.

In the present embodiment, the relation of the elongation stress of a predetermined width in the lateral direction X is: the waist belt 23 > the inner wall 42 > the outer wall 43, so that the waist belt 23 can be stably fitted to the body, and the inner wall 42 can be made to have less elasticity than the waist belt 23, so that the inner wall 42 can be made to fall obliquely downward and rearward to separate from the waist belt 23 in accordance with 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 pocket structure 30 as described above is not caused only when the legs of the wearer move but also when the wearer twists his or her body in the transverse direction in a bedtime state or the wearer holds the wearer, and can suppress the back displacement.

Further, since the outer wall 43 is substantially inelastic without disposing an elastic body, the outer wall 43 and the inner wall 42 do not approach each other and the space S does not decrease or disappear before and after the deformation of the bag structure 30. In addition, since the end flap 93, which is a part of the rear end portion 12B of the absorbent chassis 12, is located in the space S, the outer wall 43 has higher rigidity in the lateral direction X than the case of being formed of only a sheet. Therefore, even in a state where the bag structure 30 is deformed or a state where pressure is applied, the dimension of the outer wall 43 in the lateral direction X does not become small, and the lateral width of the space S does not become small. Further, since the outer wall 43 is formed by the back waist panel 60 and the back sheets 86 and 87 (including the body-side liner 84) of the absorbent chassis 12, and the inner wall 42 is formed only by the back waist panel 60, 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 higher than that of the inner wall 42, the inner wall 42 is flexibly deformed in accordance with the movement of the wearer's body, and the deformation amount of the outer wall 43 is smaller than that of the inner wall 42 although the outer wall moves in the vertical direction.

The sheet forming the waist belt 23, the inner wall 42 and the outer wall 43 is fixed only by the pair of side seams 19 located at both side edges in the lateral direction X, and is not fixed between the pair of side seams 19. Therefore, the deformable lateral dimension X of the inner wall 42 can be increased as much as possible.

Further, since the end flap 93 has the back sheets 86 and 87 which are liquid-impermeable or liquid-impermeable, leakage of highly fluid excrement which has moved into the space S can be suppressed. In the present embodiment, since the rear end portion 85a of the semi-rigid liquid-absorbent core 85 having higher rigidity than the sheet material constituting the diaper is positioned in the space S as well as the end flap 93, the deformation of the outer wall 43 can be further suppressed, and the excrement moved into the space S can be sufficiently absorbed.

As described above, in the diaper 10 of the present embodiment, the vertical dimension of the rear waist region 14 can be enlarged in accordance with the posture of the wearer to suppress back displacement, and the highly fluid excrement that has moved to the waist opening side can be accommodated and held by the pocket structure 30, so that the back can be prevented from being soiled with the excrement.

Referring again to fig. 2, the upper end edge (front waist opening edge) 13b of the front waist region 13 is located below the upper end edge (rear waist opening edge) 14b of the rear waist region 14. When the diaper 10 is unfolded and stretched in the longitudinal direction Y and the lateral direction X, the dimension between the transverse axis Q and the upper end edge 13b of the front waist region 13 is substantially the same as the dimension between the transverse axis Q and the upper end edge 14b of the rear waist region 14, but the inner wall 42 is contracted in the rear waist region 14 and is inclined with respect to the waist belt 23 so that the waist belt 23 is pulled upward and has an upwardly convex shape. Therefore, the upper end edge 14b of the rear waist region 14 may be considered to extend upward from the upper end edge 13b of the front waist region 13. When the infant wears the diaper 10, the upper edge 13b of the front waist region 13 is positioned at a relatively low position, and the umbilical region of the wearer is exposed, so that the occurrence of discomfort or irritation due to the umbilical region contacting the front waist region 13 can be suppressed.

< embodiment 2 >

Fig. 9 is an exploded plan view of the diaper 10 of embodiment 2, similar to fig. 3. The basic configuration of the diaper 10 of the present embodiment is the same as that of embodiment 1, and the different configurations will be described below.

The 2 nd fastening region 97 (the portion with dots in fig. 9) is located between a pair of side seams 19 as the 1 st fastening region, the pair of side seams 19 joining the waist belt 23, the inner wall 42 and the outer wall 43 to each other.

The 2 nd fixing region 97 is formed by bonding the inner wall 42 and the outer wall 43 to each other with an adhesive such as a hot melt adhesive. The dimension L1 in the transverse direction X of the pair of side seams 19 is greater than the dimension L2 in the transverse direction X of the pair of 2 nd fastening regions 97, the 2 nd fastening region 97 being located inside the pair of side seams 19. The 2 nd fixing region 97 need not be formed by an adhesive, and may be formed by welding means such as heat sealing or sonic waves.

The No. 2 securing region 97 joins the inner wall 42 with the outer wall 43, thus reducing the dimension of the space S of the bag structure 30 in the transverse direction X. The 2 nd fastening region 97 is located laterally outward of the backsheet 86 in the transverse direction X. Therefore, the dimension in the transverse direction X of the space S for containing excrement such as loose stools is narrowed, and is basically defined as a region overlapping the region where the absorbent chassis 12 is present, and the excrement contained in the space S can be prevented from leaking out from the openings of the space S located on both sides of the absorbent chassis 12 toward the crotch region 15.

In the lateral direction, between the side seam 19 as the 1 st fixing region and the 2 nd fixing region 97, the bag structure 30 and the inner wall 42 are not fixed, and the inner wall 42 and the outer wall 43 are not fixed, so that it is possible to suppress a decrease in the skin feeling and an increase in the rigidity of the rear waist region 14 due to the adhesive.

In the above embodiment, the diaper 10 in which the elastic members 63, 64, and 65 are not disposed on the outer wall 43 has been described. However, the present invention is not limited to this, and an elastic body may be disposed on the outer wall 43. In this case, the correlation of the elongation stress in the transverse direction X is also preferably: the waist belt 23 is larger than the inner wall 42 and larger than the outer wall 43.

Various known materials generally used in this field can be used for each constituent material constituting the diaper 10 of the present invention without limitation except for those specifically described. In the present specification, the diaper 10 having three panels, i.e., the front waist panel 17, the rear waist panel 18, and the absorbent chassis 12, is illustrated as a basic structure of the diaper 10, but may be configured of panels in which the front waist region 13, the rear waist region 14, and the crotch region 15 are continuous. In addition, instead of a pull-on diaper in which both side edge portions of the front waist region 13 and the rear waist region 14 are connected in an unworn state, an open diaper as follows may be used: in the unworn state, the side edge portions of the front and rear waist regions are not connected, and when the diaper 10 is worn, the side edge portions are connected by the tape fastener, and an open-type diaper may be one in which: in the unworn state, one side in the lateral direction X is connected and the other side is open, and in the wearing state, the other side in the lateral direction X is connected by the belt fastener. In addition, terms such as "1 st" to "2 nd" are used in the present specification only for distinguishing similar elements, positions, and the like.

Description of the reference numerals

10 wearing article (Disposable diaper)

12 absorbent substrate

12B rear end portion

13 front waist region

13b Upper edge (rear waist opening edge of rear waist region)

14 rear waist region

14b Upper edge (rear waist opening edge of rear waist region)

15 crotch region

19 side seam (1 st fixed area)

21 waist opening

23 waist belt

30 bag structure

31a 1 st bending line (1 st bending part)

33a 2 nd fold line (2 nd fold part)

42 inner wall

43 outer wall

61 st back waist panel

62 nd 2 rear waist panel

63 elastic body for waist at back lower part

64 band elastomer

65 inner wall elastomer

85 liquid absorbent core

86 bottom sheet (leak-proof sheet)

87 bottom sheet (coating sheet)

90 leg elastic body

97 nd 2 fixing region

L1 transverse dimension as side seam of the 1 st fastening region

L2 transverse dimension of No. 2 fastening region

L3 longitudinal dimension with elastomer

Longitudinal dimension of L4 inner wall elastomer

S space

In the X transverse direction

Y longitudinal direction (up-down direction)

Z front-to-back direction.

Claims (8)

1. A wearing article having a top-bottom direction, a lateral direction, and a front-back direction intersecting the top-bottom direction and the lateral direction in a worn state, the wearing article comprising: skin-facing and non-skin-facing surfaces; 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, the wearing article being characterized in that,

the rear waist region has: a pocket structure located on the skin-opposing side and extending in the transverse direction; an outer wall extending laterally upward from the crotch region; and an inner wall located between the bag structure and the outer wall in the front-rear direction and having elastic stretchability in the transverse direction,

a plurality of elastic bodies retractably extending in the transverse direction are provided in the bag structure and the inner wall,

the bag structure is opposed to the inner wall and the inner wall is opposed to the outer wall in a state where the inner wall is contracted in the lateral direction due to elastic stretchability of the inner wall, thereby dividing a space between the inner wall and the outer wall,

the rear end portion of the absorbent substrate has a liquid-impermeable or liquid-impermeable back sheet, and the rear end portion of the absorbent substrate extends to the inside of the space on the inner surface of the outer wall,

the elongation stress of the outer wall in the lateral direction is smaller than the elongation stress of the inner wall in the lateral direction,

the dimension of the elastic body at the pocket structure in the up-down direction is smaller than the dimension of the elastic body at the inner wall in the up-down direction.

2. The wearing article defined by claim 1,

the rear waist region is formed by a sheet formed by folding the sheet: a 1 st bend located between the pocket structure and the inner wall and extending in the lateral direction, a 2 nd bend located between the inner wall and the outer wall and extending in the lateral direction, the pocket structure, the inner wall, and the outer wall.

3. The wearing article defined by claim 1,

the rear waist region has a wall forming sheet formed by folding the wall forming sheet: a 1 st fold between the pocket structure and the inner wall and extending in the transverse direction, the pocket structure, and the inner wall.

4. The wearing article defined in any one of claims 1-3,

the bag structure is elastically stretchable in the transverse direction,

the bag structure, the inner wall and the outer wall have a relation of elongation stress in the transverse direction of: the pocket structure > the inner wall > the outer wall.

5. The wearing article defined in any one of claims 1-4,

the absorbent chassis having a liquid-absorbent core extending from the crotch region to the front and back waist regions,

the liquid-absorbent core extends to the inside of the space between the inner wall and the outer wall.

6. The wearing article defined in any one of claims 1-5,

the waist opening edge of the front waist region is located below the waist opening edge of the rear waist region in an unworn state.

7. The wearing article defined in any one of claims 1-6,

the outer wall is not provided with an elastic body that extends in the transverse direction in a contractible manner.

8. The wearing article defined in any one of claims 1-7,

the rear waist region has: a pair of 1 st fixation areas joining the bag structure, the inner wall and the outer wall, respectively, to each other; and a pair of No. 2 fixing regions joining the inner wall and the outer wall to each other,

the dimension in the transverse direction of the 1 st fixing region is larger than the dimension in the transverse direction of the 2 nd fixing region,

the 2 nd fixing region is located inside the 1 st fixing region.

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