CN112789018A

CN112789018A - Disposable diaper having a disposable diaper

Info

Publication number: CN112789018A
Application number: CN201880098225.1A
Authority: CN
Inventors: 松田昂平
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2018-10-01
Filing date: 2018-10-01
Publication date: 2021-05-11
Anticipated expiration: 2038-10-01
Also published as: RU2759896C1; GB2591901A; DE112018008043T5; GB2591901B; JP7168677B2; CN112789018B; WO2020070780A1; GB202103877D0; JPWO2020070780A1

Abstract

The disposable diaper of the present invention includes an absorber, a non-skin surface sheet disposed on a non-skin-facing surface side of the absorber, and an outer surface sheet disposed on a non-skin-facing surface side of the non-skin surface sheet, and has a stomach-side portion disposed on the stomach side of a wearer in a worn state, a crotch portion disposed in a crotch portion, and a back-side portion disposed on the back side. The absorbent body has a low grammage portion having a relatively low grammage compared with other portions of the absorbent body at any position from the crotch portion to the back side portion. The outer sheet of the disposable diaper and the sheet positioned on the skin-facing surface side of the outer sheet are joined by an adhesive, thereby forming a plurality of joined portions extending in the diaper longitudinal direction. The plurality of joining portions are located in a region overlapping the low grammage portion. In the region, the grammage of the adhesive is higher in the side regions of the diaper widthwise opposite side regions than in the central region of the widthwise central region.

Description

Disposable diaper having a disposable diaper

Technical Field

The present invention relates to a disposable diaper.

Background

Diapers have been proposed to prevent leakage of water-rich excrement such as watery feces and muddy feces to the outside. For example, patent document 1 describes a diaper having a pocket forming portion of a pocket openable downward in a rear waist region. This document also describes that the pocket forming portion includes: an inner pocket region extending upward from both side fixing portions fixed to the belt region; an outer pocket region located in a direction of elongation of the absorbent body; and two side regions of the pocket formed from two side portions of the inner and outer side regions of the pocket, wherein the inner region of the pocket of the forming portion is reduced in lateral dimension, and the two side regions of the pocket are bent inward in the lateral direction.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-67958

Disclosure of Invention

The present invention relates to a disposable diaper comprising: an absorbent body; a non-skin surface sheet disposed on the non-skin-facing surface side of the absorber; and an outer surface sheet disposed on the non-skin-facing surface side of the non-skin surface sheet, and the disposable diaper has a stomach-side portion disposed on the stomach side of the wearer in a worn state, a crotch portion disposed in the crotch portion, and a back-side portion disposed on the back side. The absorbent body has a low grammage portion having a relatively low grammage compared with other portions of the absorbent body at an arbitrary position from the crotch portion to the back side portion. The outer sheet and the sheet positioned on the skin-facing surface side of the outer sheet are joined together with an adhesive to form a plurality of joined portions extending in the diaper longitudinal direction. The plurality of joining portions are located in a region overlapping with the low grammage portion in the thickness direction. In the region, the grammage of the adhesive is higher in the side regions on both sides in the diaper width direction than in the central region located at the center in the diaper width direction.

Drawings

Fig. 1 is a perspective view schematically showing a natural state of a disposable diaper according to the present invention.

Fig. 2 is an expanded plan view schematically showing the skin-facing surface side (inner surface side) in an expanded and stretched state of the diaper shown in fig. 1.

3 FIG. 33 3( 3 a 3) 3 is 3 a 3 sectional 3 view 3 showing 3 an 3 embodiment 3 at 3 the 3 line 3 A 3- 3 A 3 of 3 the 3 diaper 3 shown 3 in 3 FIG. 32 3. 3

FIG. 3(B) is a sectional view showing an embodiment at the line B-B of the diaper shown in FIG. 2.

Fig. 4(a) is a plan view showing an embodiment of an absorbent body of the diaper shown in fig. 2, and fig. 4(b) is an I-I side view of the absorbent body of fig. 4 (a).

Fig. 5 is a schematic view showing an embodiment of a joint portion of the outer sheet.

Fig. 6 is a perspective view schematically showing a state after use of the disposable diaper of the present invention.

Fig. 7 is a schematic view showing another embodiment of the joint portion of the outer sheet.

3 FIG. 3 8 3 is 3 a 3 sectional 3 view 3 showing 3 another 3 embodiment 3 at 3 the 3 line 3 A 3- 3 A 3 of 3 the 3 diaper 3 shown 3 in 3 FIG. 32 3. 3

Fig. 9 is a plan view showing another embodiment of the absorbent body of the diaper shown in fig. 2.

Detailed Description

Since the diaper described in patent document 1 has a pouch formed in the back side portion thereof, the absorbent body protrudes toward the skin-facing side of the diaper, and the wearing sensation is impaired. In the diaper described in this document, the pouch is formed to bulge the back side portion of the diaper, thereby impairing the appearance of the diaper.

Accordingly, the present invention is directed to a disposable diaper and a method of manufacturing the same that can solve the disadvantages of the prior art.

The disposable diaper of the present invention will be described below based on preferred embodiments of the disposable diaper of the present invention. Fig. 1 to 3 show a pants-type disposable diaper as an embodiment of the disposable diaper of the present invention. The diaper 1 has a stomach-side portion F disposed on the stomach-side of the wearer, a back-side portion R disposed on the back-side in a worn state, and a crotch portion M located between these members and disposed in the crotch portion of the wearer. These components extend continuously in the front-rear direction of the wearer. The diaper 1 has a diaper longitudinal direction X (hereinafter, this will be simply referred to as "longitudinal direction X") extending from the abdominal side of the wearer to the back side via the crotch portion, and a diaper transverse direction Y (hereinafter, this will be simply referred to as "transverse direction Y") orthogonal thereto.

As shown in fig. 1 and 2, the diaper 1 includes an absorbent main body 2 and an outer cover 3, the absorbent main body 2 includes an absorbent body 23 capable of absorbing and retaining excrement, and the outer cover 3 is disposed on the non-skin-facing surface side of the absorbent main body 2. The opposite side edges on the front side and the opposite side edges on the back side of the diaper 1 are joined to each other by known joining means such as adhesive, heat sealing, ultrasonic sealing, etc., to form a pair of side seals S, S, a waist opening WH through which the waist of the wearer passes, and a pair of leg openings LH through which the lower limbs of the wearer pass. The details of the exterior body 3 will be described later.

Although not shown, the diaper of the present invention may be a so-called open-type disposable diaper instead of the above-described embodiment. That is, a pair of fastener tapes are formed on both side edges of the back portion R in the longitudinal direction X of the diaper 1 instead of the pair of side seals S, S. The fastener tape is attached with a fastening portion, and a fastened region where the fastening portion of the fastener tape can be detachably fastened is formed on a non-skin-facing surface of the abdomen-side portion F of the diaper 1. The fastening region is formed by being joined and fixed to a non-skin-facing surface of the non-skin-facing surface sheet that forms the non-skin-facing surface of the abdomen-side portion F.

In the present specification, the "skin-facing surface" is a surface facing the skin side of the wearer when the diaper is worn, when the diaper or a component thereof (for example, an absorbent main body) is focused on, and the "non-skin-facing surface" is a surface facing the opposite side of the skin side when the diaper is worn. That is, the skin-facing surface is a surface relatively closer to the skin of the wearer, and the non-skin-facing surface is a surface relatively farther from the skin of the wearer. "when worn" refers to a state in which the proper wearing position of the diaper is maintained.

As shown in fig. 1, the diaper 1 has a waistline portion W disposed on the waistline of the wearer when worn, between the waist opening portion WH and the leg opening portion LH. The waistline portion W is a region located at the same position in the longitudinal direction X as the side seal portion S of the diaper 1, and in the present embodiment, the abdomen-side portion F is the waistline portion W on the abdomen side, and the back-side portion R is the waistline portion W on the back side.

As shown in fig. 2, the absorbent main body 2 has a substantially rectangular shape in the unfolded and extended state of the diaper 1, and is disposed from the front side F to the back side R. The longitudinal direction of the absorbent body 2 is aligned with the longitudinal direction X of the diaper 1, and the absorbent body 2 is disposed in the center of the outer package 3 in the width direction Y. The absorbent main body 2 is joined to the exterior body 3 by joining means such as an adhesive. The "unfolded and extended state" of the diaper 1 refers to a state in which the diaper 1 is unfolded by tearing or releasing the fastening of the fastening portion of the fastener tape and the fastened region at the side seal S, and the diaper 1 in this unfolded state is extended to expand to a design size (the same size as when it is extended to a flat shape with the influence of the stretchable member completely excluded).

As shown in fig. 2 and 3, the absorbent main body 2 includes a liquid-permeable skin-facing sheet 21 forming a skin-facing surface, a liquid-impermeable (including water-repellent) non-skin-facing sheet 22 forming a non-skin-facing surface, and a liquid-retentive absorbent member 23 disposed between the

sheets

21 and 22. The absorbent body 23 is formed by covering an absorbent core 231 having absorbent performance with a liquid-permeable core-covering sheet 232. The absorbent body 23 is in direct contact with the skin sheet 21 and the non-skin sheet 22, respectively.

The absorbent body 23 in the absorbent body 2 has a low grammage part 2L having a relatively low grammage compared with other parts of the absorbent body 23 at a position from the crotch part M to the back part R in the longitudinal direction X. The low grammage portion 2L may be located only in the crotch portion M, only in the back portion R, or in both the crotch portion M and the back portion R in the longitudinal direction X. The low grammage portion 2L may be present in the entire region in the width direction Y or may be present in a part thereof. The absorbent body 23 shown in fig. 4(a) has a single low grammage part 2L only in the entire regions in the longitudinal direction X and the width direction Y of the back portion R, and the low grammage part 2L is not present in the crotch portion M. As shown in fig. 4(b), the low grammage portion 2L is recessed toward the non-skin-facing surface side from the skin-facing surface side of the absorbent body 23, and gradually decreases in thickness toward the end edge of the back side portion R.

The absorber 23 has a high grammage portion 2H having a higher grammage than the low grammage portion 2L. The boundary between the low grammage portion 2L and the high grammage portion 2H may be formed with a step different from the embodiment shown in fig. 4 (b). The high grammage portion 2H may be present at two or more locations in the absorbent body 23. In this case, the grammage of the two or more high grammage portions 2H may be the same or different. When 3 or more regions having different grammage exist in the absorbent body 23, the region having the lowest grammage is defined as the low grammage part 2L, and the other regions are defined as the high grammage parts 2H. The low grammage portion 2L is present at any position from the crotch portion M to the back portion R, and may be present at other positions as necessary.

The skin sheet 21, the non-skin sheet 22, and the absorber 23 can be made of any material conventionally used in absorbent articles without any particular limitation. For example, various nonwoven fabrics, apertured films, and the like can be used as the skin-facing sheet 21, and a resin film, a laminate of a resin film and a nonwoven fabric, and the like can be used as the non-skin-facing sheet 22. As the absorbent core 231, an aggregate of hydrophilic fibers such as wood pulp and hydrophilized synthetic fibers, or a material in which a water-absorbent polymer is held in the aggregate can be used for the absorbent body 23, and as the core sheet 232, the same material as that of the skin-facing sheet 21 can be used.

As shown in fig. 3, an outer sheet 25 is disposed on the non-skin-facing surface side of the non-skin-facing sheet 22 in the absorbent main body 2. The outer sheet 25 is disposed at least in the crotch portion M of the absorbent main body 2, and preferably extends to the front side portion F and the back side portion R through the crotch portion M. The outer sheet 25 is disposed at least between the absorbent main body 2 and the outer package 3 described later at positions located on the front side F and the back side R. The outer sheet 25 may be exposed only at the crotch portion M on the outer surface of the diaper 1, or may be further covered with the outer cover 3 so as not to be exposed at the front side F, the crotch portion M, and the rear side R.

Returning to fig. 2, the diaper 1 includes an outer package 3. The outer package 3 is disposed on the non-skin-facing surface side of the outer sheet 25 and forms the outer surface of the diaper 1. As shown in fig. 2, the peripheral edge of the outer package 3 forms the outline of at least the front side F and the back side R of the diaper 1. The exterior body 3 positioned on the front side F and the back side R has a rectangular shape having a length in the width direction Y longer than the length direction X, and forms a waist portion W. Namely, the diaper 1 shown in fig. 2 is in the following form: the outer cover 3 is divided into a back-side outer cover 3R disposed on the back side of the wearer and a front-side outer cover 3F disposed on the front side, and the absorbent main body 2 is fixed while being stretched between the back-side outer cover 3R and the front-side outer cover 3F. Instead of the above-described embodiment, the diaper of the present invention may be formed in such a shape that the outer package 3 is continuously disposed in the crotch portion M in addition to the front and back portions F and R.

As shown in fig. 3(b), the outer package 3 includes a laminate of an outer layer nonwoven fabric 31 which forms a non-skin-facing surface of the diaper 1 in a worn state, and an inner layer nonwoven fabric 32 which is disposed on a skin-facing surface of the outer layer nonwoven fabric 31. In the worn state of the diaper 1, the outer layer nonwoven fabric 31 forms a non-skin-facing surface of the diaper 1, and the inner layer nonwoven fabric 32 forms a skin-facing surface of the diaper 1. The outer layer nonwoven fabric 31 and the inner layer nonwoven fabric 32 are joined to each other at predetermined portions by joining means such as an adhesive. In relation to the outer sheet 25, the inner layer nonwoven fabric 32 is disposed on the non-skin-facing surface side of the outer sheet 25, and the outer layer nonwoven fabric 31 is disposed on the non-skin-facing surface side of the inner layer nonwoven fabric 32.

In fig. 3(b), the outer-layer nonwoven fabric 31 and the inner-layer nonwoven fabric 32, and the inner-layer nonwoven fabric 32 and the outer-surface sheet 25 are shown as being separated from each other, but this is shown only for convenience of explanation, and the nonwoven fabrics and the sheets are not actually separated and are joined to each other, not shown.

As shown in fig. 1 and 2, a plurality of 2 nd elastic members 33 in a linear or belt shape are disposed between the outer layer nonwoven fabric 31 and the inner layer nonwoven fabric 32 at intervals in the diaper longitudinal direction X. The 2 nd elastic members 33 extend in the diaper width direction Y, and are fixed in an extended state by being arranged in a plurality of numbers between the outer layer nonwoven fabric 31 and the inner layer nonwoven fabric 32. By contraction of the 2 nd elastic member 33, a waistline gather is formed at the waistline portion W when the diaper 1 is worn. The waistline gathers are formed so as to extend in the width direction Y, which is the stretchable direction of the 2 nd elastic member 33.

As shown in fig. 3 and 5, the outer sheet 25 and the sheet positioned on the skin-facing surface of the outer sheet 25 are joined together with an adhesive, thereby forming a plurality of joined portions 27 extending in the diaper longitudinal direction X and formed discontinuously in the width direction Y. The joint portion 27 is located in a region overlapping the low grammage portion 2L of the absorbent main body 2 in the thickness direction when the diaper 1 is viewed in plan, and is formed so as to extend in the longitudinal direction X. The joint portions 27 are constituted by joint portions 27a (hereinafter, also referred to as "central joint portions 27 a") formed in the central region located in the central region in the width direction Y of the diaper 1, and joint portions 27b (hereinafter, also referred to as "side joint portions 27 b") formed in the side regions located in both side regions in the width direction Y, and these joint portions are overlapped with the low grammage portion 2L in the thickness direction. The central joining portion 27a is formed by joining the outer sheet 25 to the non-skin surface sheet 22 in the central region in the width direction Y. The lateral joining portions 27b are formed by joining the outer sheet 25 to an intermediate sheet 29, which will be described later, in both lateral regions in the width direction Y. The region where the joint portion 27 and the low grammage portion 2L of the absorbent main body 2 overlap in the thickness direction is constituted by the central region 27C and the side regions 27S. The central region 27C includes a central joint portion 27a and is located at the center in the diaper width direction. The side regions 27S are located on the lateral sides in the diaper width direction with the center region 27C therebetween. The grammage of the adhesive is different between the central region 27C and the side regions 27S, and the grammage of the adhesive in the side regions 27S is preferably higher than that in the central region 27C.

Specifically, the following modes are listed: (1) is formed in the following way: the

bonding portions

27a and 27b present in the

respective regions

27C and 27S are formed of the same amount of adhesive, and the adhesive is applied so that the application intervals of the adhesive are different in the respective regions, and the grammage of the adhesive is made different between the central region 27C and the side regions 27S; (2) is formed in the following way: the side joining portions 27b present in the side regions 27S are formed so that the amount of adhesive applied to the joining portions is larger than that of the center joining portion 27a present in the center region 27C, and the adhesive is applied so that the application intervals of the adhesive are the same, so that the grammage of the adhesive in the center region 27C and the grammage of the adhesive in the side regions 27S are different from each other; or (3) the adhesive is applied in different amounts and at different intervals, and the grammage of the adhesive in the central region 27C and the lateral regions 27S are different from each other.

The diaper 1 may further include an intermediate sheet 29 disposed in both side regions in the width direction Y thereof. As shown in fig. 3, the intermediate sheet 29 is positioned between the non-skin facing sheet 22 and the outer facing sheet 25. The intermediate sheet 29 is made of a liquid-repellent or water-repellent nonwoven fabric having air permeability. The intermediate sheet 29 is formed in at least the crotch portion M of the absorbent main body 2.

The fixed end 29c of the intermediate sheet 29 along the longitudinal direction X is positioned between the non-skin-facing sheet 22 and the outer sheet 25, the free end 29a is folded back toward the skin-facing surface side of the absorbent body 23 to form a leakage preventive cuff, and the elastic member 29b is disposed in an extended state at the free end 29S of the leakage preventive cuff positioned on the free end 29a side, and has stretchability in the longitudinal direction X. The intermediate sheet 29 can rise toward the skin of the wearer starting from both side edges or the vicinity thereof in the width direction Y of the absorbent body 23 by contraction of the elastic members 29 b. The elastic member 29b is disposed along the longitudinal direction X and fixed to the intermediate sheet 29 in an extended state. The fixed end portion 29c of the side edge of the intermediate sheet 29 on the opposite side of the free end portion 29a is positioned between and joined to the non-skin-facing sheet 22 and the outer-facing sheet 25 of the absorbent main body 2.

As shown in fig. 3(a) and (b), the fixed end portion 29c has a 2 nd joining portion 27A obtained by joining the non-skin-facing sheet 22 and the intermediate sheet 29 with an adhesive. The 2 nd joining portions 27A are formed by joining the non-skin-facing sheet 22 and the intermediate sheet 29, and are formed so as to overlap the side joining portions 27b in the thickness direction Z. Further, the region where the 2 nd joining portion 2A is formed and the side region 27S are formed so as to overlap in the thickness direction Z.

According to the diaper 1 of the present embodiment having such a configuration, after the diaper is put on, since the components such as pockets are not formed on the outer surface of the diaper, the diaper has a refreshing appearance with less irregularities, and the appearance is good. Further, after excretion of heavy excrement such as feces, the widthwise central region of the absorber deforms so as to protrude outward, and a pocket 1P capable of containing feces in a wrapped manner is formed, so that even feces containing much moisture can be held well in the widthwise central region of the absorber as shown in fig. 6, and as a result, leakage of feces can be prevented. The reason why the widthwise central region of the absorbent body is deformed is that, in addition to the fact that the absorbent body has a low grammage portion which is easily deformed, the widthwise central region of the non-skin-facing sheet 22 and the outer-facing sheet 25 is also easily deformed because the grammage of the adhesive is lower in the central region 27C where the central joining portion 27a is present than in the side regions 27S where the side joining portions 27a are present.

The joining portion 27 is preferably formed to have a length in the longitudinal direction X longer than the low grammage portion 2L. With such a structure, the pouch 1P capable of retaining excrement in a wrapped manner can be formed over the entire area of the low grammage portion 2L, and leakage of excrement can be further effectively prevented.

The central region 27C is preferably a region formed in a range of 40% to 70% with the central portion of the absorbent body 23 (including the central portion of the absorbent body 23) therebetween over the entire length of the absorbent body 23 in the width direction Y, and the side regions are preferably formed in a range of 15% to 30% from both side edges of the absorbent body 23 over the entire length of the absorbent body 23 in the width direction Y. With such a configuration, the rigidity of the side region 27S where the side joining portion 27b is located can be increased, and the pouch 1P for containing feces can be formed more easily. The boundary between the central region 27C and the side region 27S is defined as the end portion of the side region 27S located closest to the center in the width direction Y on the widthwise central side of the side joining portion 27b, and the widthwise outer end of the side region 27S is defined as the widthwise end portion of the absorbent body 23.

The ratio (B/a) of the grammage (B) of the adhesive in the side region 27S where the side joining portion 27B is located to the grammage (a) of the adhesive in the central region 27C where the central joining portion 27a is located is preferably 1.3 or more, more preferably 1.5 or more, further preferably 3.0 or more, and furthermore preferably 100 or less, more preferably 80 or less, and further preferably 50 or less. Specifically, the ratio (B/a) of the grammage (B) of the adhesive in the side region 27S where the side joining portion 27B is located to the grammage (a) of the adhesive in the central region 27C where the central joining portion 27a is located is preferably 1.3 or more and 100 or less, more preferably 1.5 or more and 80 or less, and further preferably 3.0 or more and 50 or less. The grammage of the adhesive in each region is based on the area of each region when viewed in plan. With such a configuration, the rigidity of the side joining portions 27b can be further improved, and the pocket 1P for accommodating feces can be formed more smoothly.

From the same viewpoint, the grammage of the adhesive in the central region 27C where the central joining portion 27a is located is preferably 0.1g/m, provided that the above-mentioned ratio is satisfied²Above, more preferably 0.3g/m²Above, more preferably 0.5g/m²The above is preferably 10g/m²Hereinafter, more preferably 8g/m²Hereinafter, more preferably 1g/m²The following. Similarly, the grammage of the adhesive in the side region 27S where the side joining portion 27b is located is preferably 0.5g/m, provided that the above ratio is satisfied²Above, more preferably 0.7g/m²Above, more preferably 1g/m²Above, it is preferably 15g/m²Hereinafter, more preferably 10g/m²Hereinafter, it is more preferably 2g/m²The following. The grammage of each region can be measured by cutting the region to be measured as a sample, and dividing the amount of adhesive applied (g) by the area of the sample when viewed from above (m)²) And then the result is obtained.

As shown in fig. 5, the number of the side joining portions 27b extending in the longitudinal direction X is preferably larger than the number of the center joining portions 27a extending in the longitudinal direction X. With such a configuration, the rigidity of the side joint portions 27b can be further improved, and ventilation can be performed from the widthwise central region where the joint portions 27 are small, so that both ease of formation of the pouch 1P and suppression of stuffiness during wearing can be achieved.

Each of the joining portions 27 shown in fig. 5 is formed in a rib shape along the longitudinal direction X, and for example, a strip-like (long strip shape), a spiral shape, or an omega-like joining pattern having a constant width can be used. Each joint 27 can be formed continuously or discontinuously in the entire region in the longitudinal direction X of the outer sheet 25.

In particular, as shown in fig. 7, the joining portions 27 are preferably formed at intervals in the longitudinal direction X. In the joint portion 27 shown in the figure, both the central joint portion 27a and the side joint portions 27b are formed at intervals, but only one of these joint portions may be formed at intervals. With such a configuration, the rigidity of the side joint portions 27b can be increased to easily form the pocket 1P, and the flexibility of the diaper 1 itself can be increased.

The 2 nd joint portion 27A is preferably formed in a plurality of strips or a spiral shape along the longitudinal direction X, similarly to the joint portion 27 described above. With such a configuration, the rigidity of the side regions of the absorbent body can be further improved, the central region of the absorbent body can be easily deformed, and a pouch for holding feces can be easily formed. As a result, the excrement can be well retained in the pouch, and leakage can be prevented.

From the viewpoint of ease of formation of the pocket, the absorbent body 23 is preferably formed of a single layer and has the low grammage portion 2L. As an example of the form of the absorbent body 23 having a single layer and a low grammage portion 2L, a form in which the thickness of the absorbent body 23 gradually decreases with the side face as shown in fig. 4(b) can be cited.

The absorbent body 23 preferably has a higher shrinkage rate in the low grammage portion 2L in the longitudinal direction X than in other regions. As such a structure, for example, a stretchable absorbent body described in japanese patent application laid-open No. 2009-136498 or the like can be used, and absorbent bodies formed so that the low grammage portion 2L and the other portions thereof have different shrinkage rates can be used. With such a configuration, both the followability to the wearer and the deformability to the excrement can be satisfied, and leakage of the excrement can be prevented.

As shown in fig. 3, the elastic member 29b in the stretched state is preferably provided so as to overlap the central region 27C in which the central joining portion 27a is located in the thickness direction Z. When a plurality of elastic members 29b are present, at least one of the plurality of elastic members 29b may overlap the central region 27C where the central joining portion 27a is located in the thickness direction Z. With this configuration, the standing of the leakage preventing cuffs formed in the intermediate sheet 29 can be improved, and the lateral leakage of excrement can be prevented.

Returning to fig. 1, at least one of the 2 nd elastic members 33 disposed in the waistline portion W of the diaper 1 is preferably disposed so as to overlap the low grammage portion 2L of the absorbent body 23 in the thickness direction Z. That is, in the unfolded and stretched state of the diaper 1 shown in fig. 2, the low grammage portion 2L is preferably present in the back portion R of the diaper at a position where the 2 nd elastic member 33 is disposed. With such a configuration, the absorbent body 23 can be more easily deformed three-dimensionally by contraction of the 2 nd elastic member 33, and leakage of stool can be further prevented.

In particular, it is preferable that at least one of the 2 nd elastic members 33 existing at a position overlapping the low grammage portion 2L in the thickness direction is cut into a plurality of pieces so as not to exhibit stretchability. Such a process can be performed by pressing the 2 nd elastic member 33 in accordance with the position where the low grammage portion 2L of the absorbent body 23 is disposed, for example, by using the elastic member cutting portion or the like used in the method for manufacturing a composite stretchable member described in japanese patent application laid-open No. 2002-253605. With this configuration, excessive compression in the thickness direction due to contraction of the 2 nd elastic member 33 is suppressed, so that the three-dimensional deformation of the absorber is facilitated, and leakage of excrement can be prevented.

The two end portions of the 2 nd elastic member 33P cut by the above-described treatment have elastic member joining portions 35 joined by an adhesive, and the elastic member joining portions 35 and the side joining portions 27b preferably overlap in the thickness direction Z. With such a configuration, the rigidity of the side region of the absorber 23 is further improved, the three-dimensional deformation of the absorber is facilitated, and leakage of stool can be effectively prevented.

In order to minimize the gap between the back of the wearer and the waistline portion W of the back portion R, facilitate the three-dimensional deformation of the absorbent body 23, and prevent leakage of excrement in the longitudinal direction and the width direction, it is preferable that the 2 nd elastic member 33 not cut be positioned on the back-side end portion 1E side of the 2 nd elastic member 33P that is cut.

Fig. 8 and 9 show other embodiments of the absorbent body of the diaper of the present invention. In the following description, only the portions different from the above-described embodiment will be described, and the above description will be applied to the other portions. Note that the same members as those of the above embodiment are denoted by the same reference numerals.

The diaper 1 shown in fig. 8 includes an absorbent body 23 having a plurality of low rigidity portions 2S extending in the longitudinal direction X. The low stiffness portion 2S shown in fig. 9 does not include a material for forming the absorbent core 231 of the absorbent body 23, and is an open hole portion that penetrates in the thickness direction. Instead of this, a material for forming the absorbent core 231 may be present in the low stiffness portion 2S, and the grammage may be lower than that of the other regions of the absorbent body 23, or the thickness may be thinner. The

low rigidity portions

2S and 2S are provided so as to overlap the central joining portion 27a in the thickness direction Z. The low rigidity portion 2S shown in the figure is formed at least in the crotch portion M of the absorbent body, and preferably extends to the stomach-side portion F and the back-side portion R beyond the crotch portion M. With such a configuration, the absorbent body 23 can be deformed three-dimensionally with the low rigidity portions 2S as the bending axes during excretion, and a pocket capable of holding excrement is formed, so that excrement can be more perfectly held in the central region of the absorbent body as a result, and leakage can be more effectively prevented.

The width in the width direction Y of one low rigidity portion 2S is preferably larger than the width in the width direction Y of one joining portion 27 existing in the side joining portion 27 b. The width of one low rigidity portion 2S in the width direction Y is preferably smaller than the total width of the side joining portions 27b in the width direction Y. With such a configuration, it is possible to achieve both improvement of the three-dimensional deformability of the absorber 23 and suppression of accidental leakage of excrement through the low rigidity portion 2S.

Specifically, the width W1 (see fig. 9) in the width direction Y of the low rigidity portion 2S depends on the width and thickness of the absorbent body 23, but is preferably 0.5mm or more, more preferably 5mm or more, and further preferably 20mm or less, more preferably 15mm or less. The width of the joining portion 27 existing in the lateral joining portion 27b in the width direction Y is preferably 0.5mm or more, more preferably 0.8mm or more, and preferably 5mm or less, more preferably 2mm or less per piece.

As shown in fig. 8, in a cross-sectional view in the diaper width direction Y, the positions of the outer side edges 27L and the low stiffness portions 2S in the width direction Y of the central region 27C where the central joined portion 27a is formed preferably overlap in the thickness direction. That is, the boundary portion 27L between the central region 27C and the side region 27S preferably overlaps the position of the low rigidity portion 2S in the thickness direction. With such a configuration, since the portions of the absorbent body 23 having different grammage of the adhesive can be deformed substantially in conformity with the low rigidity portion 2S, the effect of forming pockets by the three-dimensional deformation of the absorbent body can be enhanced, and leakage of stool can be effectively prevented.

From the same viewpoint, it is preferable that the low rigidity portion 2S is present at least in the low grammage portion 2L as shown in fig. 9. That is, the low rigidity portion 2S preferably extends to a portion where the low grammage portion L is located. The high grammage portion 2H shown in the figure is preferably located outward in the diaper longitudinal direction X relative to the low grammage portion 2L and is formed to be located on the side of the rear side portion R. With such a configuration, the pocket can be formed three-dimensionally by deformation of the low grammage portion 2L, so that the feces can be kept intact, and leakage from the front-rear direction of the wearer can be prevented more effectively.

In terms of facilitating the formation of a pouch capable of retaining excrement in the absorbent body in a three-dimensional manner and preventing leakage, the ratio (T2/T1) (see fig. 9) of the length T2 from the widthwise central portion CL of the absorbent body 23 to the widthwise outer side portions of the low stiffness portions 2S to the length T1 from the widthwise central portion CL of the absorbent body 23 to the widthwise end portions in a cross-sectional view in the diaper widthwise direction Y is preferably 0.4 or more, more preferably 0.5 or more, further preferably 0.6 or more, furthermore preferably 0.9 or less, more preferably 0.8 or less, further preferably 0.7 or less. Specifically, it is preferably 0.4 or more and 0.9 or less, more preferably 0.5 or more and 0.8 or less, and still more preferably 0.6 or more and 0.7 or less.

Specifically, the length T1 from the widthwise central portion CL to the widthwise end portions of the absorbent body 23 is preferably 35mm or more, more preferably 50mm or more, and further preferably 75mm or less, more preferably 65mm or less. The length T2 from the widthwise central portion CL to the widthwise outer end of the low rigidity portion 2S is preferably 20mm or more, more preferably 30mm or more, and further preferably 50mm or less, more preferably 40mm or less.

The disposable diaper having the above structure can be an open-type or pants-type disposable diaper. From the viewpoint of wearing convenience for the wearer and the wearing assistant, a pants type as shown in fig. 1 and 6 is preferable. As a pants-type disposable diaper, a mode may be adopted in which the outer cover 3 is divided into a front-side outer cover and a back-side outer cover, or a mode may be adopted in which the outer cover 3 is disposed from the front-side portion F to the back-side portion R via the crotch portion M instead of this mode. In any case, the disposable diaper of the present invention has a good appearance after wearing the diaper, and after excreta such as feces, the pocket 1P is formed so that the absorber protrudes outward as shown in fig. 6, so that the feces can be absorbed and held in the pocket 1P, and leakage of the feces can be suppressed.

The present invention has been described above based on preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. For example, the absorbent body 23 shown in fig. 4(a) may be provided with the low rigidity portion 2S shown in fig. 9.

The present invention further discloses the following pants-type disposable diaper and a method for manufacturing the same.

<1>

A disposable diaper, comprising: an absorbent body; a non-skin surface sheet disposed on the non-skin-facing surface side of the absorber; and an outer surface sheet disposed on the non-skin-facing surface side of the non-skin surface sheet, and the disposable diaper has a stomach-side portion disposed on the stomach side of the wearer in a worn state, a crotch portion disposed in the crotch portion, and a back-side portion disposed on the back side,

the absorbent body has a low grammage part having a relatively low grammage compared with other parts of the absorbent body at any position from the crotch part to the back part,

the outer sheet and the sheet positioned on the skin-facing surface side of the outer sheet are joined together with an adhesive to form a plurality of joined portions extending in the longitudinal direction of the diaper,

a plurality of the joint portions are located in a region overlapping with the low grammage portion in a thickness direction,

in the region, the grammage of the adhesive is higher in the side regions on both sides in the diaper width direction than in the central region located at the center in the diaper width direction.

<2>

The disposable diaper according to the above <1>, wherein a length of the joining portion in the diaper longitudinal direction is longer than a length of the low grammage portion in the diaper longitudinal direction.

<3>

The disposable diaper according to the above <1> or <2>, wherein a ratio of a grammage of the adhesive in the side regions to a grammage of the adhesive in the central region is 1.3 or more and 100 or less.

<4>

The disposable diaper according to any one of the above <1> to <3>, wherein a ratio of a grammage of the adhesive in the side regions to a grammage of the adhesive in the central region is preferably 1.3 or more, more preferably 1.5 or more, further preferably 3.0 or more, and further preferably 100 or less, more preferably 80 or less, further preferably 50 or less.

<5>

As described above<4>The disposable diaper described above is preferably such that the grammage of the adhesive in the central region satisfies the above ratio, and is 0.1g/m²Above, more preferably 0.3g/m²Above, more preferably 0.5g/m²The above is preferably 10g/m²Hereinafter, more preferably 8g/m²Hereinafter, more preferably 1g/m²The following.

<6>

As described above<4>Or<5>The disposable diaper described above, wherein the grammage of the adhesive in the side regions satisfies the above ratio, and is preferably 0.5g/m²Above, more preferably 0.7g/m²Above, more preferably 1g/m²Above, it is preferably 15g/m²Hereinafter, more preferably 10g/m²Hereinafter, it is more preferably 2g/m²The following.

<7>

The disposable diaper according to any one of the above <1> to <6>, wherein the number of the joining portions formed in the side regions is larger than the number of the joining portions formed in the central region.

<8>

The disposable diaper according to any one of the above <1> to <7>, wherein the joint portions are formed at intervals in a diaper longitudinal direction.

<9>

The disposable diaper according to any one of the above <1> to <8>, wherein the absorbent body is single-layered.

<10>

The disposable diaper according to any one of the above <1> to <9>, wherein the absorbent body has a single low grammage portion only in the entire region in the longitudinal direction and the width direction of the back side portion.

<11>

The disposable diaper according to any one of the above <1> to <10>, wherein the low grammage portion gradually decreases in thickness as it goes to an end edge of the back side portion.

<12>

The disposable diaper according to any one of the above <1> to <11>, which comprises an intermediate sheet between the non-skin surface sheet and the outer surface sheet,

and a 2 nd joining part formed by joining the non-skin-facing sheet and the intermediate sheet with an adhesive,

the region where the 2 nd joining portion is formed and the side region are provided so as to overlap in the thickness direction.

<13>

The disposable diaper according to <12> above, wherein the intermediate sheet is disposed in both side regions in the diaper width direction,

the outer sheet is joined to the non-skin-facing sheet in a central region in a diaper width direction to form the joint portion in the central region, and is joined to the intermediate sheet in both side regions in the diaper width direction to form the joint portion in the side regions.

<14>

The disposable diaper according to the above <12> or <13>, wherein the 2 nd joining part and the joining part formed in the side region are provided so as to overlap in a thickness direction.

<15>

The disposable diaper according to any one of the above <12> to <14>, wherein a plurality of the 2 nd joining parts are formed in a strip shape or a spiral shape along a diaper longitudinal direction.

<16>

The disposable diaper according to any one of the above <12> to <15>, wherein one side region of the intermediate sheet in the diaper longitudinal direction is positioned between the non-skin surface sheet and the outer sheet, the other side region is folded back toward the skin-facing surface side of the absorbent body to form a leakage preventive cuff, and the elastic member is disposed at a free end of the leakage preventive cuff in an extended state.

<17>

The disposable diaper according to the above <16>, wherein a position of the elastic member in an extended state overlaps the central region in a thickness direction.

<18>

The disposable diaper according to any one of the above <1> to <17>, wherein the absorbent body has a plurality of low rigidity portions extending in a longitudinal direction thereof,

each of the low rigidity portions overlaps the joint portion formed in the central region in the thickness direction.

<19>

The disposable diaper according to the above <18>, wherein a width of one of the low rigidity portions is larger than a width of one of the joining portions formed in the side regions.

<20>

The disposable diaper according to the above <18> or <19>, wherein a width of one of the low rigidity portions is smaller than a total width of the joining portions formed in the side regions.

<21>

The disposable diaper according to any one of <18> to <20> above, wherein a ratio of a length from a widthwise central portion of the absorbent body to a widthwise outer portion of the low stiffness portion to a length from the widthwise central portion of the absorbent body to widthwise end portions of the absorbent body in a cross section in a diaper widthwise direction is 0.4 or more and 0.9 or less.

<22>

The disposable diaper according to any one of <18> to <21> above, wherein a ratio of a length from the widthwise central portion to the widthwise outer side portions of the low rigidity portion to a length from the widthwise central portion to the widthwise end portions of the absorbent body in a cross section in the diaper widthwise direction is preferably 0.4 or more, more preferably 0.5 or more, further preferably 0.6 or more, and further preferably 0.9 or less, more preferably 0.8 or less, further preferably 0.7 or less.

<23>

The disposable diaper according to any one of <18> to <22> above, wherein a length from a widthwise central portion to widthwise end portions of the absorbent body is preferably 35mm or more, more preferably 50mm or more, and further preferably 75mm or less, more preferably 65mm or less.

<24>

The disposable diaper according to any one of <18> to <23> above, wherein a length from a widthwise central portion of the absorbent body to a widthwise outer end portion of the low rigidity portion 2S is preferably 20mm or more, more preferably 30mm or more, and further preferably 50mm or less, more preferably 40mm or less.

<25>

The disposable diaper according to any one of the above <18> to <24>, wherein each outer edge of the joint portion formed in the central region and the low rigidity portion overlap in a thickness direction.

<26>

The disposable diaper according to any one of the above <18> to <25>, wherein the low rigidity portion is present at least in the low grammage portion.

<27>

The disposable diaper according to any one of the above <18> to <26>, wherein a material forming an absorbent core of the absorbent body is not present in the low rigidity portion.

<28>

The disposable diaper according to any one of <18> to <27> above, wherein a width of the low rigidity portion in the width direction is preferably 0.5mm or more, more preferably 5mm or more, and further preferably 20mm or less, more preferably 15mm or less.

<29>

The disposable diaper according to any one of the above <18> to <28>, wherein the low rigidity portion preferably extends to a portion where the low grammage portion is located.

<30>

The disposable diaper according to any one of the above <1> to <29>, wherein,

an exterior sheet having an exterior body on a non-skin-facing surface side thereof,

the outer package has an inner nonwoven fabric disposed on the non-skin-facing surface side of the outer sheet and an outer nonwoven fabric disposed on the non-skin-facing surface side of the inner nonwoven fabric,

a plurality of No. 2 elastic members extending in the diaper width direction are arranged between the outer layer nonwoven fabric and the inner layer nonwoven fabric,

at least one of the 2 nd elastic members and the low grammage portion are arranged so as to overlap in the thickness direction, forming a waist gather extending in the diaper width direction.

<31>

The disposable diaper according to the above <30>, wherein at least one of the 2 nd elastic members existing at a position overlapping the low grammage portion in the thickness direction is cut so as not to exhibit stretchability.

<32>

The disposable diaper according to the above <30> or <31>, which comprises an elastic member joining part formed by joining both end parts of a cut 2 nd elastic member to the exterior body with an adhesive, wherein the elastic member joining part and the joining part formed in the side region overlap each other in a thickness direction.

<33>

The disposable diaper according to any of <30> to <32> above, wherein the 2 nd elastic member that is not cut is located on the back side end portion side of the 2 nd elastic member that is cut.

<34>

The disposable diaper according to any one of the above <1> to <33>, wherein the absorbent body has a high grammage part higher than the grammage of the low grammage part at a position on a back side of the low grammage part.

<35>

The disposable diaper according to any one of the above <1> to <34>, wherein a contraction rate of the low grammage portion in a diaper longitudinal direction is higher than a contraction rate of the other region of the absorbent body.

<36>

The disposable diaper according to any one of the above <1> to <35>, wherein the central region is formed in a range of 40% to 70% with the central portion of the absorber interposed therebetween, over the entire length of the absorber in the width direction,

the side regions are formed in a range of 15% to 30% from both side edges of the absorbent body, respectively, with respect to the entire length of the absorbent body in the width direction.

<37>

The disposable diaper according to any one of the above <1> to <36>, wherein the outer sheet has an outer covering on a non-skin-facing surface side thereof,

the outer cover is divided into a back-side outer cover arranged on the back side of the wearer and a front-side outer cover arranged on the front side,

an absorbent body including the absorber is fixed while being stretched between the back-side outer cover and the abdomen-side outer cover.

<38>

The disposable diaper according to any one of the above <1> to <37>, which is pants-type.

Industrial applicability of the invention

According to the present invention, a disposable diaper capable of preventing leakage of feces without impairing the appearance when worn can be provided.

Claims

1. A disposable diaper, comprising: an absorbent body; a non-skin surface sheet disposed on the non-skin-facing surface side of the absorber; and an outer surface sheet disposed on the non-skin-facing surface side of the non-skin surface sheet, and the disposable diaper has a stomach-side portion disposed on the stomach side of the wearer in a worn state, a crotch portion disposed in the crotch portion, and a back-side portion disposed on the back side,

the disposable diaper is characterized in that:

2. The disposable diaper of claim 1, wherein:

the length of the joint portion in the diaper longitudinal direction is longer than the length of the low grammage portion in the diaper longitudinal direction.

3. A disposable diaper according to claim 1 or 2, characterized in that:

the ratio of the grammage of the adhesive in the side regions to the grammage of the adhesive in the central region is 1.3 or more and 100 or less.

4. A disposable diaper according to any of claims 1 to 3, characterized in that:

the number of the joining portions formed in the side regions is larger than the number of the joining portions formed in the central region.

5. The disposable diaper according to any one of claims 1 to 4, characterized in that:

the joint portions are formed at intervals in the diaper longitudinal direction.

6. The disposable diaper according to any one of claims 1 to 5, characterized in that:

the absorbent body is single-layered.

7. The disposable diaper according to any one of claims 1 to 6, characterized in that:

comprising an intermediate sheet positioned between the non-skin facing sheet and the outer facing sheet,

8. The disposable diaper of claim 7, wherein:

the intermediate sheet is disposed in both side regions in the width direction of the diaper,

9. A disposable diaper according to claim 7 or 8, characterized in that:

the 2 nd joining portion and the joining portion formed in the side region are provided so as to overlap in a thickness direction.

10. A disposable diaper according to any of claims 7 to 9, characterized in that:

the 2 nd joint portion is formed in a plurality of strips or a spiral shape along the diaper longitudinal direction.

11. A disposable diaper according to any of claims 7 to 10, characterized in that:

in the intermediate sheet, one side region of the intermediate sheet in the diaper longitudinal direction is positioned between the non-skin-facing sheet and the outer sheet, the other side region is folded back toward the skin-facing surface side of the absorbent body to form a leakage prevention cuff, and the elastic member is disposed at a free end of the leakage prevention cuff in an extended state.

12. The disposable diaper of claim 11, wherein:

the position of the elastic member in the stretched state overlaps the central region in the thickness direction.

13. A disposable diaper according to any of claims 1 to 12, characterized in that:

the absorber has a plurality of low rigidity portions extending in the longitudinal direction thereof,

14. The disposable diaper according to claim 13, characterized in that:

the width of one of the low rigidity portions is larger than the width of one of the joining portions formed in the side region.

15. A disposable diaper according to claim 13 or 14, characterized in that:

the width of one of the low rigidity portions is smaller than the total width of the joining portions formed in the side region.

16. A disposable diaper according to any of claims 13 to 15, characterized in that:

in a cross section in the diaper width direction, a ratio of a length from a widthwise central portion of the absorbent body to widthwise outer portions of the low stiffness portions to a length from the widthwise central portion of the absorbent body to widthwise end portions of the absorbent body is 0.4 or more and 0.9 or less.

17. A disposable diaper according to any of claims 13 to 16, characterized in that:

each of outer side edges of the joint portion formed in the central region and the low rigidity portion overlap in a thickness direction.

18. A disposable diaper according to any of claims 13 to 17, characterized in that:

the low rigidity portion is present at least in the low grammage portion.

19. A disposable diaper according to any of claims 1 to 18, characterized in that:

20. The disposable diaper of claim 19 wherein:

at least one of the 2 nd elastic members existing at a position overlapping the low grammage portion in the thickness direction is cut so as not to exhibit stretchability.

21. The disposable diaper of claim 20 wherein:

and an elastic member joint portion formed by joining both end portions of the cut 2 nd elastic member and the exterior body with an adhesive, the elastic member joint portion and the joint portion formed in the side region being overlapped in a thickness direction.

22. A disposable diaper according to claim 20 or 21, characterized in that:

the 2 nd elastic member that is not cut is located on the back end side of the 2 nd elastic member that is cut.

23. A disposable diaper according to any of claims 1 to 22, characterized in that:

the absorber has a high grammage portion having a higher grammage than the low grammage portion on a back side of the low grammage portion.

24. A disposable diaper according to any of claims 1 to 23, characterized in that:

the contraction rate of the low grammage part in the diaper longitudinal direction is higher than that of the other region of the absorbent body.

25. A disposable diaper according to any of claims 1 to 24, characterized in that:

the central region is formed in a range of 40% to 70% with the central portion of the absorber interposed therebetween, with respect to the entire length of the absorber in the width direction,

26. A disposable diaper according to any of claims 1 to 25, characterized in that:

the disposable diaper is pants-type.