CN114681207A

CN114681207A - Disposable wearing article

Info

Publication number: CN114681207A
Application number: CN202011586965.5A
Authority: CN
Inventors: 川上祐介; 高居义; 王茵华; 郑凌霜
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2022-07-01
Also published as: WO2022145212A1; JPWO2022145212A1

Abstract

The present invention relates to a disposable wearing article. Provided is a wearing article with an opening region that is easily expanded when worn and that is not easily displaced when worn. The disposable wearing article has an opening region provided with a stretchable sheet formed of a laminate sheet including an elastic sheet, the stretchable sheet having an elasticity retention rate of 80% or more as measured by the following tensile test: (1) a 1 st cycle is performed, the 1 st cycle including a 1 st advancing path and a 1 st returning path, (2) a 2 nd cycle is performed following the 1 st cycle, the 2 nd cycle including a 2 nd advancing path and a 2 nd returning path, (3) the elasticity retention is calculated as a ratio of a tensile force at 50% stretch on the 2 nd returning path to a tensile force at 50% stretch on the 1 st advancing path.

Description

Disposable wearing article

Technical Field

The present disclosure relates to a disposable wearing article.

Background

Elastic members such as elastic threads and stretch nonwoven fabrics are often used in disposable wearing articles such as disposable paper diapers.

For example, patent document 1 discloses the following composite sheet as a stretch nonwoven fabric.

A composite sheet, comprising: a non-stretchable sheet; a stretchable nonwoven fabric comprising thermoplastic fibers and elastomer fibers different from the thermoplastic fibers, wherein a plurality of band-shaped sparse regions and a plurality of band-shaped dense regions formed along a 1 st direction are alternately and continuously formed on both surfaces of the stretchable nonwoven fabric in a 2 nd direction orthogonal to the 1 st direction, and the band-shaped dense regions on one surface and the band-shaped dense regions on the other surface are alternately arranged in the 2 nd direction; and a bonding section for bonding the non-stretchable sheet to the stretchable non-woven fabric.

Documents of the prior art

Patent document

Patent document 1: international publication No. 2008/066009

Disclosure of Invention

Problems to be solved by the invention

When the x-axis and y-axis of an elastic member such as an elastic yarn or a stretch nonwoven fabric are respectively an elongation and a tensile force, the tensile force at the time of contraction (return path) tends to be smaller than that at the time of elongation (forward path), and in order to prevent a worn article from slipping down in a worn state, the elastic member is often designed based on a relatively low tensile force at the time of contraction. That is, in the wearing article, the opening region requires a relatively high stretching force to stretch when worn, and is difficult to expand and wear. In particular, in summer, when the skin of the wearer is wet with sweat or the like, the friction between the wearing article and the skin increases, and the wearing article becomes more difficult to wear.

Further, the elastic member tends to decrease in tensile force at the time of re-extension and re-contraction due to repeated expansion and contraction, and is likely to slip down in a worn state.

Accordingly, an object of the present disclosure is to provide a wearing article in which an opening region is easily expanded when worn and is not easily displaced in a worn state.

Means for solving the problems

The present inventors have found that a disposable wearing article having an opening region is characterized in that the wearing article is provided with a stretchable sheet in the opening region, the stretchable sheet is formed of a laminate sheet including an elastic sheet obtained by molding an elastic resin material containing a thermoplastic elastic resin as a main component into a sheet shape, the stretchable sheet has an elasticity retention rate of 80% or more as measured by the following tensile test: (1) performing a 1 st cycle including a 1 st advancing path for elongating the stretch panel by 80% at a speed of 300 mm/min and a 1 st returning path for returning the stretch panel to 0% at the same speed, (2) performing a 2 nd cycle including a 2 nd advancing path for elongating the stretch panel again by 80% at a speed of 300 mm/min and a 2 nd returning path for returning the stretch panel to 0% at the same speed, following the 1 st cycle, (3) calculating the elasticity retention as a ratio of a tensile force at 50% elongation on the 2 nd returning path to a tensile force at 50% elongation on the 1 st advancing path.

ADVANTAGEOUS EFFECTS OF INVENTION

In the worn article of the present disclosure, the opening region is easily expanded when worn and is not easily displaced in a worn state.

Drawings

Fig. 1 is a diagram for explaining a pants-type diaper 1 according to embodiment 1.

Fig. 2 is a diagram for explaining the pants-type diaper 1 according to embodiment 1.

Fig. 3 is a diagram for explaining the pants-type diaper 1 according to embodiment 1.

Fig. 4 is a diagram for explaining the pants-type diaper 1 according to embodiment 1.

Fig. 5 is a diagram for explaining the pants-type diaper 1 according to embodiment 1.

Fig. 6 is a diagram for explaining the pants-type diaper 1 according to embodiment 1.

FIG. 7 is a graph showing a tensile test of the stretch panel No.1 of example 1.

FIG. 8 is a graph showing a tensile test of the stretch nonwoven fabric No.1 of comparative example 1.

FIG. 9 is a graph showing a tensile test of the elastic yarn-containing nonwoven fabric No.1 of comparative example 2.

FIG. 10 is a graph showing a tensile test of the stretch film No.1 of comparative example 3.

Description of the reference numerals

1. A pants-type diaper; 3. an exterior body; 5. an absorbent main body; 7. a card-holding section; 9. a left side locking part; 11. a right-side locking part; 13. a waist opening; 15. a leg opening; 17. a stretchable sheet; 19. a front side expansion piece; 20. a rear expansion sheet; 21. a front outer sheet; 23. a front inner sheet; 25. the front side is folded back; 27. a rear outer sheet; 29. a rear inner panel; 31. the back side is folded back; 33. a front elastic sheet; 51. a rear elastic sheet; FP, the precursor part; RP, back parts; WR, waist region; FWR, front waistline region; RWR, rear waistline region; CR, leg girth area.

Detailed Description

Specifically, the present disclosure relates to the following technical solutions.

[ solution 1]

A disposable wearing article having an opening region, characterized in that,

the wearing article includes, in the opening region, a stretchable sheet formed of a laminate sheet including an elastic sheet obtained by molding an elastic resin material containing a thermoplastic elastic resin as a main component into a sheet shape, the stretchable sheet having an elasticity retention rate of 80% or more as measured by a tensile test as follows:

(1) performing a 1 st cycle including a 1 st advancing path of elongating the stretch panel by 80% at a speed of 300 mm/min and a 1 st returning path of returning the stretch panel to 0% at the same speed,

(2) following cycle 1, cycle 2 is performed, the cycle 2 including a 2 nd advancing path for re-elongating the stretch panel by 80% at a speed of 300 mm/min and a 2 nd returning path for returning the stretch panel to 0% at the same speed,

(3) the elastic retention was calculated as the ratio of the tensile force at 50% elongation on the 2 nd return path to the tensile force at 50% elongation on the 1 st forward path.

The wearing article includes a stretchable sheet having a predetermined elasticity retention rate in the opening region. The above elastic retention was calculated as the ratio (percentage) of the tensile force at 50% elongation on the 2 nd return path to the tensile force at 50% elongation on the 1 st forward path. The "stretching force at 50% elongation in the 1 st forward path" corresponds to an "stretching force" for stretching the opening region of the wearing article when the wearing article is worn, and the "stretching force at 50% elongation in the 2 nd return path" corresponds to a "contracting force" for contracting the opening region in a worn state of the wearing article, and the predetermined elasticity retention ratio is such that the difference between the "stretching force" for stretching the opening region of the wearing article when the wearing article is worn and the "contracting force" for contracting the opening region in a worn state of the wearing article is small.

Therefore, even when the stretchability of the opening region including the stretchable sheet is designed based on the contractive force (the tensile force in the 2 nd return path) in the worn state, the stretching force (the tensile force in the 1 st forward path) during wearing is not likely to increase. In addition, in the above-described wearing article, since the opening region is provided with the stretchable sheet having a predetermined elasticity retention rate, the contractile force (tensile force in the 2 nd return path) of the opening region is less likely to decrease with time.

Therefore, in the wearing article, the opening region is easily expanded when worn and is not easily displaced in a worn state.

In the present specification, "worn" means when a new worn article is worn by a wearer, and "worn state" means a state in which the worn article is worn by the wearer.

[ solution 2]

The wearing article according to claim 1, wherein,

the stretch panel has the elasticity retention rate of 90% or more.

In the wearing article, the stretchable sheet has a predetermined elasticity retention rate, and therefore, the opening region is likely to expand when worn and is less likely to be displaced when worn.

[ solution 3]

The wearing article according to claim 1 or 2, wherein,

the opening region is a waistline region having a waistline opening.

In the wearing article, the opening region is a waistline region having a waistline opening. Therefore, in the worn article, the waistline region is easily expanded when worn, and is less likely to slip off in the worn state.

[ solution 4]

The wearing article according to claim 3, wherein,

the stretchable sheet is configured to be in contact with the waist opening portion.

In the wearing article, the stretchable sheet is disposed in contact with the waist opening portion. Therefore, the wearing article can be easily worn by spreading the portion of the waistline region close to the waistline opening portion large. In addition, since the stretchability of the waistline region in the vicinity of the waistline opening portion is less likely to decrease with time, the waistline region is less likely to slip off in the worn state in the worn article.

[ solution 5]

The wearing article according to claim 3 or 4, wherein,

the wearing article further includes an absorbent core,

the wearing article is provided with the stretch panel so as not to overlap the absorbent core in the thickness direction in the expanded state of the wearing article.

Since the wearing article includes the absorbent core at a predetermined position, the expansion and contraction of the expansion sheet is not easily hindered by the absorbent core. Therefore, in the worn article, the waistline region is likely to expand when worn and is less likely to slip off in the worn state.

[ solution 6]

The wearing article according to claim 5, wherein,

the wearing article further includes an absorbent main body containing at least a liquid-permeable sheet and the absorbent core,

the wearing article includes the stretchable sheet so as not to overlap the absorbent main body in the thickness direction in the expanded state of the wearing article.

Since the wearing article includes the absorbent main body at a predetermined position, the expansion and contraction of the stretchable sheet is not easily hindered by the absorbent main body. Therefore, in the worn article, the waistline region is likely to expand when worn and is less likely to slip off in the worn state.

[ solution 7]

The wearing article according to any one of claims 3 to 6, wherein,

the wearing article is a pants-type wearing article having a waistline direction and a height direction orthogonal to the waistline direction, and including a front body portion, a back body portion, and a pair of leg hole openings,

the wearing article includes a pair of locking portions in the waistline region, the pair of locking portions being formed by fusing a nonwoven fabric containing heat-fusible fibers constituting the front body portion and the nonwoven fabric constituting the rear body portion, and extending from the waistline opening portion to the pair of leg hole opening portions,

the stretchable sheet is a laminate of the elastic sheet and the nonwoven fabric, and is disposed on one or both of the pair of locking portions.

In the clothing article, the stretchable sheet is disposed in one or both of the pair of locking portions.

In the above-described wearing article, since the stretchable sheet having a predetermined elasticity retention rate is disposed in the waistline region, the waistline region can be expanded with a relatively small force when worn, and therefore, the pair of locking portions is not easily broken originally when worn.

In the clothing article, the elastic resin material in the stretchable sheet has a different composition from the heat-fusible fiber in the nonwoven fabric, and therefore the elastic resin material in the stretchable sheet functions to reduce the strength of the locking portion formed by fusing the nonwoven fabric.

Therefore, the wearing article is easy to wear because the pair of locking portions are not easily broken when worn, and easy to discard because the pair of locking portions are easily broken when discarded.

[ solution 8]

The wearing article according to claim 7, wherein,

the nonwoven fabric contains 50 to 100 mass% of the heat-fusible fiber.

In the clothing article, the nonwoven fabric contains the heat-fusible fiber at a predetermined mass ratio, and therefore, the locking strength of the portion of the pair of locking portions where the stretchable sheet is not disposed can be relatively increased, and the locking strength of the portion where the stretchable sheet is disposed can be relatively decreased. Therefore, the difference in the locking strength between the portion where the stretchable sheet is not disposed and the portion where the stretchable sheet is disposed can be increased, and further, the pair of locking portions is made less likely to break when the wearing article is worn, so that the wearing article can be worn easily, and the pair of locking portions is made more likely to break when the wearing article is discarded, so that the wearing article can be discarded easily.

[ solution 9]

The wearing article according to claim 7 or 8, wherein,

the non-woven fabric is selected from the group consisting of a through-air non-woven fabric, a spunbond non-woven fabric, a point-bond non-woven fabric, a needle-punched non-woven fabric, a meltblown non-woven fabric, and an SMS non-woven fabric.

In the clothing article, the nonwoven fabric is selected from a predetermined group, and therefore, the waistline region of the clothing article is likely to expand when worn and is less likely to slip off when worn. Further, the wearing article is easy to wear because the pair of locking portions are not easily broken when worn, and easy to discard because the pair of locking portions are easily broken when discarded.

[ solution 10]

The wearing article according to any one of claims 7 to 9, wherein,

the stretchable sheet is disposed in a high-count region where the number of the nonwoven fabrics constituting the pair of locking portions is relatively large.

In the pair of locking portions, the strength of locking tends to be higher in a high number region where the number of sheets is relatively large than in a low number region where the number of sheets is relatively small. As a result, the locking strength of the pair of locking portions varies depending on the location, and it may be difficult to break the pair of locking portions when the worn article is discarded.

In the above-described wearing article, the stretchable sheet is disposed in the high sheet number region of the pair of locking portions, and therefore the strength of locking in the high sheet number region can be reduced, and the variation in the locking strength of the pair of locking portions with location can be reduced. Therefore, the pair of locking portions can be easily broken when the wearing article is discarded, and the wearing article can be easily discarded.

[ solution 11]

The wearing article according to any one of claims 7 to 10, wherein,

the stretchable sheet is disposed in a predetermined stretchable sheet disposition region extending in the waistline direction and the height direction in the waistline region.

In the wearing article, the stretchable sheet is arranged in the predetermined stretchable sheet arrangement region, and therefore the wearing article can reliably exhibit the effect of the stretchable sheet.

[ solution 12]

The wearing article according to claim 11, wherein,

the stretch panel arrangement region is disposed so as to be within 50% or less of the height of the waistline region in the height direction.

In the wearing article, the stretchable sheet is disposed so as to be within a predetermined range of the waistline region. Therefore, the pair of locking portions can be divided into a portion that is relatively easy to break and a portion that is relatively difficult to break. Therefore, the wearing article can be easily worn by making the pair of locking portions less likely to break when the wearing article is worn, and the wearing article can be easily discarded by making the pair of locking portions likely to break when the wearing article is discarded.

[ solution 13]

The wearing article according to claim 11 or 12, wherein,

the stretch panel arrangement region is arranged so as to be wound around the waist in the waistline direction.

In the wearing article, the stretch panel arrangement region is arranged so as to be wound around in the waistline direction, and therefore, in the wearing article, the waistline region is more likely to expand when worn and is less likely to slip off in the worn state.

[ solution 14]

The wearing article according to any one of claims 11 to 13, wherein,

the stretchable sheet is continuously arranged in the stretchable sheet arrangement region.

In the clothing article, the stretchable sheet is continuously arranged in the stretchable sheet arrangement region, and therefore, the effect of the stretchable sheet can be reliably exhibited in the entire stretchable sheet arrangement region.

[ solution 15]

The wearing article according to any one of claims 11 to 14, wherein,

the stretch panel arrangement region is arranged so as not to contact the leg hole opening portion.

In the wearing article, the stretch panel arrangement region is arranged so as not to contact the leg hole openings to which a strong force is likely to be applied in a worn state. Therefore, the pair of locking portions is not easily broken in the worn state of the wearing article.

Hereinafter, the wearing article of the present disclosure will be described in detail.

Fig. 1 to 6 are views for explaining a disposable wearing article, specifically, a disposable pants-type diaper 1 according to one embodiment of the present disclosure (hereinafter, referred to as "embodiment 1"). Specifically, fig. 1 is a perspective view of a pants-type diaper 1. Fig. 2 is an expanded view of the pants-type diaper 1. Fig. 3 is a development view of the absorbent main body 5. Fig. 4 and 5 are partially enlarged views of the front body part FP and the back body part RP of the pants-type diaper 1 in the developed view of the pants-type diaper 1, respectively. Fig. 6 is a cross-sectional view of the left locking portion 9 of the exterior body 3 corresponding to the VI-VI end face of fig. 2. In fig. 6, the state of compression is not reflected from the viewpoint of understanding the constituent members of the left engaging portion 9 (engaging portion 7) of the exterior body 3.

The pants-type diaper 1 according to embodiment 1 is divided into an outer package 3 and an absorbent main body 5 disposed inside (on the skin side) the outer package 3.

As shown in fig. 1, the pants-type diaper 1 has a waistline direction WD and a height direction HD perpendicular to the waistline direction WD in a worn state. As shown in fig. 2, the pants-type diaper 1 according to embodiment 1 has a longitudinal direction L, a width direction W, and a thickness direction T that are orthogonal to each other in an unfolded state.

As shown in fig. 2, the pants-type diaper 1 is divided into a front part FP and a back part RP by a longitudinal center line LC extending in parallel with the width direction W at the center in the longitudinal direction L. The pants-type diaper 1 is divided in the longitudinal direction L into a waist region WR and leg-surrounding regions CR, which are regions where a pair of locking portions 7 (left locking portion 9 and right locking portion 11) are present, and the waist region WR is divided into a front waist region FWR disposed in the front part FP and a rear waist region RWR disposed in the rear part RP. In fig. 2, the leg hole regions CR are disposed between the front waistline region FWR and the rear waistline region RWR.

The waistline region WR and the leg hole region CR are in contact with the waistline opening 13 and the leg hole openings 15, respectively.

The absorbent main body 5 includes: a liquid-permeable sheet 101; a liquid-impermeable sheet 107; and a 1 st absorbent core 103 and a 2 nd absorbent core 105 disposed between the liquid-permeable sheet 101 and the liquid-impermeable sheet 107.

In addition, the absorbent main body 5 includes: a pair of leakage preventing walls 109 provided with elastic members 111 for the leakage preventing walls; and a leg-surrounding elastic member 113 that imparts elasticity to the leg-surrounding region CR.

The outer package 3 includes, in the front waistline region FWR: a front outer sheet 21; a front-side inner sheet 23; and a front elastic sheet 33 and a plurality of front elastic members 37 arranged between the front outer sheet 21 and the front inner sheet 23.

The front outer sheet 21, the front inner sheet 23, and a front folded sheet 25 described later are each formed of a long fiber nonwoven fabric containing 100 mass% of heat-fusible fibers. The front elastic sheet 33 is formed by molding an elastic resin material containing a thermoplastic elastic resin as a main component into a sheet shape. The plurality of front-side thread-like elastic members 37 are elastic threads, respectively.

The exterior body 3 includes a front folded-back sheet 25 in the front waistline region FWR, the front folded-back sheet 25 is formed by folding back the front outer sheet 21 inward at an end edge (not shown) of the waistline opening 13, and the front folded-back sheet 25 is disposed inward (on the skin side) of the front inner sheet 23.

The front folded-back sheet 25 covers the front end portion (not denoted by a reference numeral) of the absorbent main body 5 and is disposed inside the front end portion of the absorbent main body 5, thereby preventing the end portion of the absorbent main body 5 from coming into direct contact with the wearer.

The front elastic panel 33 is disposed in the front stretch panel disposition region 35 of the front waistline region FWR, and the plurality of front-side elastic members 37 are disposed in the front-side elastic member disposition region 39 of the front waistline region FWR.

The front stretch panel disposition region 35 occupies about 25% of the height h in the height direction HD of the front waistline region FWR, and is disposed in the vicinity of the waistline opening 13. The front-side elastic member disposition region 39 occupies about 75% of the height h of the front waistline region FWR in the height direction HD, is in contact with the front stretch panel disposition region 35, and is disposed in the vicinity of the leg hole openings 15.

In the front stretch panel disposition region 35, the front elastic panel 33 is ultrasonically bonded together with the front outer panel 21, the front inner panel 23, and the front folded panel 25 to form the front stretch panel 19 as a laminate. The front stretchable panel 19 includes a plurality of front joining portions 45 formed by ultrasonically joining and welding the front outer panel 21, the front elastic panel 33, the front inner panel 23, and the front folded panel 25. The plurality of front-side joining portions 45 are arranged in a staggered manner in the front-side stretch panel arrangement region 35.

In the front stretch panel disposition region 35, an adhesive (e.g., a hot melt adhesive) for bonding the front outer panel 21, the front elastic panel 33, the front inner panel 23, and the front folded panel 25 is not used.

In the front-line elastic member disposition region 39, the plurality of front-line elastic members 37 are joined to the front outer sheet 21 and the front inner sheet 23 by a hot-melt adhesive applied to the plurality of front-line elastic members 37. Further, the front inner sheet 23 and the front folded sheet 25 are joined by a hot melt adhesive.

The outer package 3 includes, in the rear waistline region RWR: a rear outer sheet 27; a rear inner sheet 29; and a rear elastic sheet 51, a plurality of rear linear elastic members 55, and a plurality of rear leg-surrounding linear elastic members 58, which are disposed between the rear outer sheet 27 and the rear inner sheet 29.

The rear outer sheet 27, the rear inner sheet 29, and a rear folded sheet 31 described later are each formed of a long fiber nonwoven fabric containing 100 mass% of heat-fusible fibers. The rear elastic sheet 51 is formed by molding an elastic resin material containing a thermoplastic elastic resin as a main component into a sheet shape. The plurality of rear-side linear elastic members 55 and the plurality of rear-side leg-surrounding linear elastic members 58 are elastic threads, respectively.

The exterior body 3 includes a rear folded-back sheet 31 formed by folding back the rear outer sheet 27 inward at the end edge (not shown) of the waistline opening 13 in the rear waistline region RWR, and the rear folded-back sheet 31 is disposed at a position further inward (skin side) than the rear inner sheet 29.

The rear folded sheet 31 covers the rear end portion (not denoted by a reference numeral) of the absorbent main body 5 and is disposed inside the rear end portion of the absorbent main body 5, thereby preventing the end portion of the absorbent main body 5 from coming into direct contact with the wearer.

The rear elastic sheet 51 is disposed in the rear stretch sheet disposition region 53 of the rear waistline region RWR, and the plurality of rear elastic members 55 are disposed in the rear elastic member disposition region 57 of the rear waistline region RWR.

The rear stretch panel disposition region 53 occupies about 25% of the height h of the rear waistline region RWR in the height direction HD, and is disposed in the vicinity of the waistline opening 13. The rear-side linear elastic member disposition region 57 occupies approximately 75% of the height h of the rear waistline region RWR in the height direction HD, is in contact with the rear stretchable panel disposition region 53, and is disposed in the vicinity of the leg hole openings 15.

In the rear stretchable panel disposition region 53, the rear elastic panel 51 is ultrasonically bonded to the rear outer panel 27, the rear inner panel 29 and the rear folded-back panel 31 to form the rear stretchable panel 20 as a laminate sheet. The rear stretchable panel 20 includes a plurality of rear joining portions 63 formed by ultrasonically joining and welding the rear outer panel 27, the rear elastic panel 51, the rear inner panel 29 and the rear folded-back panel 31. The plurality of rear joining portions 63 are arranged in the rear stretch panel arrangement region 53 in a staggered manner.

In the rear stretch panel disposition region 53, an adhesive (for example, a hot melt adhesive) for bonding the rear outer panel 27, the rear elastic panel 51, the rear inner panel 29, and the rear folded-back panel 31 is not used.

In the rear-side linear elastic member arrangement region 57, the plurality of rear-side linear elastic members 55 are joined to the rear outer sheet 27 and the rear inner sheet 29 by a hot-melt adhesive applied to the plurality of rear-side linear elastic members 55. The rear inner sheet 29 and the rear folded sheet 31 are joined together by a hot-melt adhesive.

The front waistline region FWR is divided into: a front high sheet count region 41 including the front outer sheet 21, the front inner sheet 23, and the front folded sheet 25; and a front low-count region 43 which is constituted by the front outer sheet 21 and the front inner sheet 23 and does not include the front folded sheet 25.

The front stretch panel disposition region 35 in which the front elastic panel 33 is disposed in the front high sheet count region 41.

The rear waistline region RWR is divided into: a rear high sheet count region 59 composed of the rear outer sheet 27, the rear inner sheet 29, and the rear folded sheet 31; and a rear low sheet count region 61 which is constituted by the rear outer sheet 27 and the rear inner sheet 29 and does not include the rear folded-back sheet 31.

The rear stretch panel arrangement region 53 in which the rear elastic panel 51 is arranged in the rear high-count region 59.

The pair of latching portions 7 (the left latching portion 9 and the right latching portion 11) are formed by: the pants-type diaper 1 in the unfolded state is folded with the longitudinal centerline LC as a folding line so that the absorbent main body 5 is positioned inside, and then, both ends (not shown) in the width direction W of the front waistline region FWR and the rear waistline region RWR are compressed by overlapping so that the front high-count region 41 of the front waistline region FWR coincides with the rear high-count region 59 of the rear waistline region RWR and so that the front low-count region 43 of the front waistline region FWR coincides with the rear low-count region 61 of the rear waistline region RWR.

In the pants-type diaper 1 according to embodiment 1, each of the front side stretch panel 19 and the rear side stretch panel 20 has an elasticity retention ratio of 90% or more in a predetermined tensile test. In the pants-type diaper 1, the stretchable panel 17 composed of the front stretchable panel 19 and the rear stretchable panel 20 is disposed so as to be wound around the waist region WR in the waist direction while sandwiching the pair of locking portions 7 therebetween. As a result, the waist region WR of the pants-type diaper 1 is likely to expand when worn, and is less likely to slip off when worn.

The stretch panel 17 is disposed in a region of 25% or less of the height h in the height direction HD of the waistline region WR. Thus, the pants-type diaper 1 can be easily worn by making the pair of locking portions 7 less likely to break when the pants-type diaper 1 is worn, and the pants-type diaper 1 can be easily discarded by making the pair of locking portions 7 more likely to break when the pants-type diaper 1 is discarded.

The stretch panel 17 is disposed so as to contact the waistline opening 13. As a result, the pants-type diaper 1 is easily worn with the portion of the waistline region WR near the waistline opening 13 expanded to a large extent. In addition, since the stretchability of the waist region WR in the portion near the waist opening 13 is less likely to decrease with time, the waist region WR is less likely to slip off in the worn state of the pants-type diaper 1.

The stretchable sheet 17 is disposed so as not to contact the leg hole openings 15. Thus, the pair of locking portions 7 is less likely to be broken when the wearing article is worn.

The disposable wearing article of the present disclosure (hereinafter, may be referred to as "the wearing article of the present disclosure") is not particularly limited as long as it has an opening region, and examples thereof include disposable diapers, disposable pants, disposable underpants, and the like.

Examples of the opening region include a waistline region having a waistline opening, and a leg-surrounding region having a leg-surrounding opening.

The wearing article of the present disclosure includes the stretchable sheet in the opening region. The stretch panel is a laminate sheet including an elastic sheet obtained by molding an elastic resin material containing a thermoplastic elastic resin as a main component into a sheet shape.

The thermoplastic elastic resin is preferably a thermoplastic resin exhibiting rubber elasticity at room temperature, and examples thereof include JIS K6418: 2007 to U.S. Pat. No. 4. The thermoplastic elastomer resin preferably has a temperature range of elastic deformation of about 100 ℃ or less.

Examples of the thermoplastic elastic resin include olefin elastomers (for example, VERSIFY (trademark) by dow chemical), propylene elastomers (for example, Vistamaxx (trademark) by exxon mobil), and styrene elastomers (for example, Quintac (trademark) by japan rayleigh corporation).

The elastic sheet can be produced by using the thermoplastic elastic resin, for example, according to the method described in international publication No. 2019/150801.

The stretchable sheet is a laminate of the elastic sheet and another sheet. Examples of the other sheet include a nonwoven fabric, a woven fabric, and a woven fabric.

For example, the stretch panel may include a 1 st nonwoven fabric, a 2 nd nonwoven fabric, and an elastic sheet disposed between the 1 st nonwoven fabric and the 2 nd nonwoven fabric.

Examples of the nonwoven fabric include a hot-air nonwoven fabric, a spunbond nonwoven fabric, a point-bond nonwoven fabric, a spunlace nonwoven fabric, a needle-punch nonwoven fabric, a meltblown nonwoven fabric, and an SMS nonwoven fabric (spunbond-meltblown-spunbond nonwoven fabric).

The nonwoven fabric contains heat-fusible fibers, and the nonwoven fabric contains heat-fusible fibers in an amount of preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, and still more preferably 90% by mass or more. The nonwoven fabric may contain 100 mass% of the heat-fusible fiber. Accordingly, the pair of locking portions is not easily broken when the wearing article is worn, so that the wearing article can be easily worn, and the pair of locking portions is easily broken, so that the wearing article can be easily discarded.

In the stretch panel, the elastic sheet and the other sheet may be joined to each other by, for example, a welded portion (e.g., embossed, ultrasonic-based, or the like), an adhesive portion (e.g., hot-melt adhesive-based) or the like. The joining portion is preferably a welded portion, and particularly preferably an ultrasonic welded portion. This is because, in particular, the weld portion by ultrasonic waves is less likely to hinder the stretchability of the stretch panel by reducing the size thereof.

The stretch sheet has an elasticity retention of 80% or more, preferably 85% or more, and more preferably 90% or more in a tensile test. The stretch panel preferably has an elasticity retention of 100% or less, more preferably 98% or less, and still more preferably 96% or less. Thus, the opening region of the wearing article is easily expanded when worn and is less likely to be displaced when worn.

The tensile test was performed as follows.

(1) As the tensile testing machine, a universal testing machine (3400 series) manufactured by Instron corporation was prepared.

(2) The stretch pieces were allowed to stand at 25 ℃. + -. 2 ℃ for 24 hours.

(3) The stretch panels were cut into 160mm by 40mm sizes to prepare samples, and the distance between chucks: 80mm the sample was placed on a jig.

(4) Cycle 1 was performed, which cycle 1 comprised elongating the sample to elongation at a rate of 300 mm/min: 80% (+64mm, inter-chuck distance 144mm) of 1 st advance path and then return the sample to elongation at a speed of 300 mm/min: 0% (+ -0 mm, inter-chuck distance: 80mm) 1 st return path.

(5) Following cycle 1, cycle 2 was performed, which cycle 2 included elongating the sample to elongation at a rate of 300 mm/min: 80% (+64mm, inter-chuck distance 144mm) of the 2 nd path of advance and then returning the sample to elongation at a speed of 300 mm/min: 0% (+ -0 mm, inter-chuck distance: 80mm) 2 nd return path.

(6) The elastic retention was calculated as the ratio (percentage) of the tensile force at 50% elongation (inter-chuck distance: 120mm) on the 2 nd return path of the 2 nd cycle to the tensile force at 50% elongation (inter-chuck distance: 120mm) on the 1 st advance path of the 1 st cycle.

In the case where the wearing article of the present disclosure includes a waistline region having a waistline opening portion as an opening region provided with the stretchable sheet, the stretchable sheet is preferably disposed so as to be in contact with the waistline opening portion. Thus, the wearing article can be easily worn by widening the waist opening. In addition, since the stretchability of the waistline opening is less likely to decrease with time, the wearing article is less likely to slip off in a worn state.

In the present disclosure, the stretchable panel is provided so as to be in contact with the waistline opening, and the distance between the stretchable panel and the waistline opening end is preferably 5% or less, more preferably 3% or less, and still more preferably 1% or less of the height (height in the height direction) of the waistline region.

In the case where the wearing article of the present disclosure includes a waistline region having a waistline opening portion as the opening region, when the wearing article further includes an absorbent core, the wearing article preferably includes an extensible sheet so as not to overlap with the absorbent core in a thickness direction in an expanded state thereof. This makes the stretch of the stretchable sheet less likely to be hindered by the absorbent core, and the waistline region of the worn article is likely to expand when worn and less likely to slip off when worn.

In the case where the wearing article of the present disclosure includes a waistline region having a waistline opening portion as the opening region, when the wearing article further includes an absorbent main body, the wearing article preferably includes a stretchable sheet so as not to overlap with the absorbent main body in the thickness direction in the developed state. This makes the stretch of the stretchable sheet less likely to be hindered by the absorbent main body, and the waistline region of the wearing article is likely to expand when worn and less likely to slip off when worn.

The absorbent main body may include at least a liquid-permeable sheet and an absorbent core, and may further include a pair of leakage-preventing walls, a liquid-impermeable sheet, an outer sheet, and the like.

In the case where the wearing article of the present disclosure is a pants-type wearing article having a waistline direction and a height direction orthogonal to the waistline direction and including a front body portion, a back body portion, and a pair of leg hole openings, the wearing article includes a pair of locking portions in a waistline region, the pair of locking portions being formed by welding a nonwoven fabric including heat-fusible fibers constituting the front body portion and the nonwoven fabric constituting the back body portion, and extending from the waistline opening to the pair of leg hole openings, in this case, it is preferable that the stretchable sheet is a laminate sheet of the elastic sheet and the nonwoven fabric, and the stretchable sheet is disposed in one or both of the pair of locking portions. Accordingly, the wearing article is easy to wear because the pair of locking portions are not easily broken when worn, and is easy to discard because the pair of locking portions are easily broken when discarded.

The expansion piece is preferably disposed on both of the pair of locking portions. This is because the above-described effect can be reliably exhibited in both of the pair of locking portions.

The pair of locking portions is generally disposed on the right and left sides in the worn state, but is not limited thereto.

Preferably, the stretchable sheet is disposed in the high-count region when the pair of locking portions are divided into the high-count region in which the number of nonwoven fabrics constituting the locking portions is relatively large and the low-count region in which the number of nonwoven fabrics constituting the locking portions is relatively small. Examples of the high sheet count region include a folded-back sheet formed by folding back an outer sheet inward, and a protective sheet disposed on the inner side (skin side) of the end portion in the longitudinal direction of the absorbent main body to prevent the end portion of the absorbent main body from directly contacting the wearer.

The stretchable panel may be disposed in a predetermined stretchable panel disposition region extending in the waistline direction and the height direction in the waistline region. In the predetermined stretch panel disposition region, the stretch panels (elastic panels) may be disposed continuously (integrally) or intermittently in the stretch panel disposition region.

For example, in the predetermined stretch panel arrangement region, the stretch panels may be arranged continuously or intermittently in the height direction. In the predetermined stretch panel disposition region, the stretch panels may be disposed continuously or intermittently in the waistline direction.

For example, by arranging the stretch panels continuously (continuously in both the height direction and the waistline direction) in the stretch panel arrangement region, the effect of the stretch panels can be achieved over the entire stretch panel arrangement region.

Further, by intermittently arranging the stretch panel (intermittently in at least one of the height direction and the waistline direction) in the stretch panel arrangement region, the effect of the stretch panel can be exhibited, and the air permeability (air permeability in the thickness direction) of the stretch panel in the stretch panel arrangement region can be ensured.

The stretch panel disposition region may be disposed in a region 100% of the height of the waistline region in the height direction, but is preferably disposed in a region of 75% or less, more preferably in a region of 50% or less, and even more preferably in a region of 25% or less. The stretch panel disposition region is preferably disposed in a region of 5% or more, more preferably 10% or more, and still more preferably 12% or more in the height direction. Accordingly, the wearing article can be easily worn by making the pair of locking portions less likely to break when the wearing article is worn, and the wearing article can be easily discarded by making the pair of locking portions more likely to break when the wearing article is discarded.

The stretch panel disposition region may be disposed so as to make a round turn in the waistline direction in the stretch panel disposition region. In this way, in the worn article, the waistline region is more likely to expand when worn, and is less likely to slip off when worn.

The stretch panel placement region may be disposed so as not to contact the leg hole opening. Thus, the pair of locking portions is not easily broken in the worn state of the wearing article.

The stretchable sheet (elastic sheet) has a predetermined height (length) in the height direction, preferably 5mm or more, more preferably 10mm or more, and still more preferably 15mm or more. Thus, the worn article can reliably function as the stretchable sheet.

[ examples ]

The present disclosure will be described below by way of examples, but the present disclosure is not limited to these examples.

Production example 1

As the thermoplastic elastic resin, a styrene elastomer was used to produce elastic sheet No. 1.

In a state where the elastic sheet No.1 was elongated by 100% (2 times the original length), a spunbonded nonwoven fabric (basis weight: 15 g/m) was used²) And SMS nonwoven fabric (weight per unit area: 13g/m²) The resultant was sandwiched and ultrasonically bonded, thereby producing a laminate having a plurality of bonding portions (bonding area: 0.06mm²Number density: 82,000 pieces/m²) The stretchable sheet No. 1.

Production example 2

A gear-stretched stretchable nonwoven fabric manufactured by Mitsui chemical Co., Ltd was subjected to gear stretching, and a spunbond nonwoven fabric (weight per unit area: 15 g/m) was used in a state where the stretched nonwoven fabric after gear stretching was stretched to 100% (2 times the original length)²) And SMS nonwoven fabric (weight per unit area: 13g/m²) The resultant was sandwiched and ultrasonically bonded, thereby producing a laminate having a plurality of bonding portions (bonding area: 0.12mm²Number density: 150,000 pieces/m²) Is telescopicSheet No. 1.

Production example 3

620dtex elastic yarn was arranged at 5mm intervals, and in a state where the elastic yarn was stretched 100% (2 times the original length), a hot melt adhesive was applied to the elastic yarn using a V-shaped slit, and a spunbonded nonwoven fabric (basis weight: 15 g/m)²) And SMS nonwoven fabric (weight per unit area: 13g/m²) A nonwoven fabric No.1 containing elastic yarns was prepared with the elastic yarns sandwiched therebetween.

Production example 4

A hot-melt adhesive was applied in an omega pattern on the entire surface of a stretchable film manufactured by 3M company, and a spun-bonded nonwoven fabric (weight per unit area: 15 g/M) was used in a state where the stretchable film was stretched 100% (2 times the original length)²) And SMS nonwoven fabric (weight per unit area: 13g/m²) Nonwoven fabric No.1 containing the stretch film was produced by sandwiching.

Example 1 and comparative examples 1 to 3

The stretch sheet No.1, the stretch nonwoven fabric No.1, the nonwoven fabric No.1 containing elastic threads, and the nonwoven fabric No.1 containing a stretch film were subjected to a tensile test. Fig. 7 (example 1), fig. 8 (comparative example 1), fig. 9 (comparative example 2), and fig. 10 (comparative example 3) show graphs of tensile tests. In addition, the elasticity retention is shown in table 1.

In each of fig. 7 to 10, the 1 st cycle and the 2 nd cycle are data of which the upper side is a forward path and the lower side is a return path.

[ Table 1]

TABLE 1

Claims

1. A disposable wearing article having an opening region, characterized in that,

the wearing article is provided with a stretchable sheet in the opening region,

the stretch panel is formed from a laminate sheet comprising an elastic sheet obtained by molding an elastic resin material containing a thermoplastic elastic resin as a main component into a sheet shape, and has an elasticity retention rate of 80% or more,

the retention of elasticity is measured by the following tensile test:

2. The article of wear of claim 1,

the stretch panel has the elasticity retention rate of 90% or more.

3. The article of wear of claim 1 or 2,

the opening region is a waistline region having a waistline opening.

4. The article of wear of claim 3,

5. The wearing article according to claim 3 or 4,

the wearing article further comprises an absorbent core which,

6. The article of wear of claim 5,

the wearing article includes the stretch panel so as not to overlap the absorbent main body in the thickness direction in the expanded state of the wearing article.

7. The wearing article according to any one of claims 3 to 6,

8. The article of wear of claim 7,

the nonwoven fabric contains 50 to 100 mass% of the heat-fusible fiber.

9. The article of wear of claim 7 or 8,

10. The wearing article according to any one of claims 7 to 9,

11. The wearing article according to any one of claims 7 to 10,

12. The article of wear of claim 11,

the stretch panel disposition region is disposed within a range of 50% or less of the height of the waistline region in the height direction.

13. The wearing article according to claim 11 or 12,

14. The wearing article according to any one of claims 11 to 13,

15. The wearing article according to any one of claims 11 to 14,