CN114929173A

CN114929173A - Pants-type absorbent article

Info

Publication number: CN114929173A
Application number: CN202080089970.7A
Authority: CN
Inventors: 有田光佑; 恩田蓝子; 藏前亮太
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2019-12-26
Filing date: 2020-12-23
Publication date: 2022-08-19
Also published as: JP2021104151A; JP7377705B2; CN116747079A; WO2021132293A1

Abstract

The invention provides a pants-type absorbent article. An absorbent body (2) of an absorbent article (1) comprises an absorbent body (5) having an absorbent sheet (51), and the absorbent sheet (51) has particles of an absorbent polymer (513) disposed between 2 fibrous sheets (511, 512). The back-side outer package (3B) has a back-side extension (39) extending downward from the side seal (S). The back-side extension (39) has a back-side first expansion region (X1) that extends in the lateral direction (Y) and is expandable and contractible in the lateral direction (Y). When the absorbent article (1) is viewed in plan, the first back-side stretchable region (X1) does not overlap the central region (5A) of the absorbent body (5) in the lateral direction (Y), and overlaps the side regions (5B) adjacent to the central region.

Description

Pants-type absorbent article

Technical Field

The present invention relates to a pants-type absorbent article such as a pants-type disposable diaper.

Background

Pants-type disposable diapers mainly comprising 3 sheets of an abdomen-side sheet, a back-side sheet and a crotch sheet are known. This type of diaper has an advantage that legs of a wearer can be easily moved because legs in the crotch portion can be largely secured, and the appearance in a worn state becomes neat. However, the buttocks are easily exposed, and the covering property is not sufficient. Therefore, it has been proposed to provide a back side sheet with an extensible part by disposing an elastic member extending in the lateral direction, thereby improving the coverage of the buttocks (see patent documents 1 and 2).

In addition to the above techniques, a technique for improving the fit of a diaper by thinning an absorbent body has been proposed. For example, patent document 3 describes a disposable diaper having an absorbent body formed of 2 layers of an upper absorbent body and a lower absorbent body, wherein the upper absorbent body is composed of pulp and an absorbent polymer, and the lower absorbent body is composed of a structure in which the absorbent polymer is arranged between 2 sheets.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2016-202569

Patent document 2: US2018/271715A1

Patent document 3: japanese patent laid-open publication No. 2018-50987

Disclosure of Invention

The present invention relates to a pants-type absorbent article.

The absorbent article includes an abdominal-side outer cover disposed on the abdominal side of a wearer, a back-side outer cover disposed on the back side of the wearer, and an absorbent main body fixed to the outer covers so as to be stretched between the abdominal-side outer cover and the back-side outer cover.

The absorbent article has a longitudinal direction extending between the front-side exterior body and the back-side exterior body and a transverse direction orthogonal to the longitudinal direction, and has side seals formed by joining both side edges of the front-side exterior body and the back-side exterior body to each other.

The absorbent main body includes an absorbent body having absorbent sheets having 2 fibrous sheets which are the same or different, and particles of absorbent polymers disposed between the fibrous sheets.

The back-side exterior body has a back-side extension portion extending downward from the side seal portion.

The dorsal extension has a dorsal first expansion region extending along the lateral direction and expandable and contractible along the lateral direction.

The first back-side stretchable region does not overlap the widthwise central region of the absorbent body and overlaps side regions adjacent to the central region in a plan view of the absorbent article.

Drawings

Fig. 1 is a view schematically showing a natural state of a pants-type disposable diaper as one embodiment of a pants-type absorbent article of the present invention.

Fig. 2 is a developed plan view schematically showing the skin-facing surface side in a developed and stretched state of the diaper shown in fig. 1.

Fig. 3 is an exploded perspective view schematically showing the skin-facing surface side in an unfolded and stretched state of the diaper shown in fig. 1.

Fig. 4 is a cross-sectional view schematically showing a section along the longitudinal centerline CLx of fig. 2 in a worn state of the diaper shown in fig. 1.

Fig. 5 is a cross-sectional view schematically showing the section I-I of fig. 2 in a worn state of the diaper shown in fig. 1.

Fig. 6 is a cross-sectional view schematically showing a cross section along the thickness direction of an embodiment of an absorbent sheet usable as the absorbent body of the present invention.

Fig. 7 is a schematic perspective view of the absorbent sheet shown in fig. 6.

Fig. 8 is a schematic enlarged view illustrating another arrangement of the auxiliary layer.

Fig. 9 is a schematic diagram illustrating the structure of a modification of the auxiliary layer.

Fig. 10 is a schematic diagram illustrating the structure of an auxiliary layer having a low-rigidity portion.

Fig. 11 is a developed plan view schematically showing the structure of a pants-type absorbent article having a different structure of the back-side outer body.

Fig. 12 is a developed plan view schematically showing the structure of a pants-type absorbent article having a different structure of the back-side outer body.

Fig. 13 is an expanded plan view schematically showing the structure of a pants-type absorbent article having a different structure of an absorbent main body.

Detailed Description

In the diapers described in

patent documents

1 and 2, the absorbent body is disposed in the vicinity of the leg circumference in the worn state, and the absorbent body is likely to be deformed by the movement of the wearer. In particular, when the absorbent body located at a position corresponding to the buttocks is deformed, the deformed absorbent body enters the buttocks, and there is a possibility that the wearing appearance is deteriorated, a feeling of wearing discomfort, and leakage. When a thin absorbent body as described in patent document 3 is used, the absorbent body is more severely deformed due to the low rigidity of the absorbent body.

Accordingly, the present invention provides a pants-type absorbent article which can prevent deformation of a thin absorbent body to a satisfactory extent without impairing the fit of the absorbent body, and which can exhibit a good appearance in a worn state.

Hereinafter, a pants-type absorbent article according to a preferred embodiment of the present invention will be described with reference to the drawings. Fig. 1 to 4 show a pants-type diaper 1 as one embodiment of a pants-type absorbent article according to the present invention.

The diaper 1 has a longitudinal direction X corresponding to the front-back direction of the wearer and a lateral direction Y orthogonal thereto, as shown in fig. 2. The diaper 1 has a crotch portion C, and a front side portion a and a back side portion B extending in the longitudinal direction X from the front and back of the crotch portion C. The diaper 1 extends in the longitudinal direction X from the stomach side portion a to the back side portion B. In the present specification, the "front-back direction of the wearer" refers to a direction extending between the abdomen side and the back side of the wearer through the crotch. The crotch portion C is a portion disposed in the crotch portion of the wearer in the worn state of the diaper 1. The abdomen-side portion a is a portion disposed on the abdomen side, i.e., the front side of the wearer, of the crotch portion C in the worn state of the diaper 1. The back portion B is a portion disposed on the back side, which is the back side of the wearer, with respect to the crotch portion C in the worn state of the diaper 1.

The diaper 1 has a longitudinal centre line CLx located in the centre of the longitudinal direction X. The longitudinal centerline CLx is an imaginary straight line that bisects the diaper 1 in the longitudinal direction X and extends in the transverse direction Y in an unfolded and elongated state as shown in fig. 2. The "developed and stretched state" of the diaper 1 refers to a state in which the diaper 1 is developed by cutting a side seal portion described later, and the diaper 1 in the developed state is stretched so that elastic members of the respective portions are stretched to a designed dimension (the same dimension as when the diaper 1 is stretched to a flat shape in a state in which the influence of the elastic members is completely eliminated).

The diaper 1 has an absorbent main body 2 and an outer package 3. As shown in fig. 3, the exterior body 3 includes

outer layer sheets

31 and 32 and

inner layer sheets

33 and 34 from the non-skin-facing side toward the skin-facing side. The outer layer sheet 31 and the inner layer sheet 33 are joined to each other to form a ventral-side outer package 3A disposed on the ventral side of the wearer, and the outer layer sheet 32 and the inner layer sheet 34 are joined to each other to form a dorsal-side outer package 3B disposed on the dorsal side of the wearer.

The

outer sheets

31 and 32 are stretchable sheets. The

outer sheets

31 and 32 form the non-skin-facing surface of the diaper 1 at least on the stomach-side portion a and the back-side portion B. The

inner sheets

33 and 34 are non-stretchable sheets. The

outer layer sheets

31 and 32 are joined to the

inner layer sheets

33 and 34 in a state of being elongated in the transverse direction Y by a known joining method such as an adhesive.

The diaper 1 has a pair of side seals S, S formed by joining both side portions AS, BS of the front-side outer package 3A and the back-side outer package 3B to each other by a known joining method such AS adhesive, heat sealing, ultrasonic sealing, or the like. As shown in fig. 1, the diaper 1 is a pants-type absorbent article in which a waist opening portion WH through which the waist of a wearer passes and a pair of leg opening portions LH and LH through which the lower limbs of the wearer pass are formed by joining the front-side outer casing 3A and the back-side outer casing 3B at side seals S, S.

In the present specification, the "skin-facing surface" refers to a surface facing the skin side of the wearer when the diaper 1 is worn, that is, a surface relatively close to the skin side of the wearer, of the diaper 1 which is an absorbent article or a component thereof (e.g., an absorbent main body), and the "non-skin-facing surface" refers to a surface facing the opposite side to the skin side when the diaper 1 is worn, that is, a surface relatively far from the skin side of the wearer, of the diaper 1 or a component thereof. The term "worn" as used herein means that a normal proper wearing position, that is, a state in which a proper wearing position of the absorbent article is maintained, and does not include a state in which the absorbent article is displaced from the wearing position.

The diaper 1 has an absorbent main body 2 in which a front-side outer cover 3A and a back-side outer cover 3B are divided in a longitudinal direction X and fixed to the front-side outer cover 3A and the back-side outer cover 3B so as to be stretched between these outer covers.

As shown in fig. 2, the absorbent main body 2 has a rectangular shape in plan view, is disposed in the center portion in the lateral direction Y of the front-side outer cover 3A and the back-side outer cover 3B so that the longitudinal direction thereof coincides with the longitudinal direction X of the diaper 1, and extends in the longitudinal direction X from the front-side portion a to the back-side portion B. One end 2A of the absorbent body 2 is fixed to the inner sheet 33 by a body fixing portion 72, and one end 2B of the absorbent body 2 is fixed to the inner sheet 34 by a body fixing portion 73. The absorbent main body 2 has an absorbent body 5. The absorber 5 includes a thin absorbent sheet 51 and an auxiliary layer 52 laminated on the absorbent sheet 51, and forms the thin absorber 5.

As shown in fig. 2, the abdominal-side outer cover 3A and the back-side outer cover 3B each have a plurality of linear or belt-shaped waist

elastic members

41, 41 disposed in an extended state between the outer layer sheet 31 and the inner layer sheet 33, and between the outer layer sheet 32 and the inner layer sheet 34. Specifically, the elastic members 41 are arranged in a manner such that the plurality of waist elastic members 41 are stretched in the lateral direction Y and spaced apart from each other at predetermined intervals in the longitudinal direction X at the open end of the waist opening WH of the wearer and in the vicinity thereof in each of the front and back portions a and B. The waist elastic member 41 is disposed between the side seal portions S along the longitudinal direction X in the front and back side portions a and B, respectively, and in a region extending outward in the longitudinal direction X from the end edge of the absorbent main body 2 in the longitudinal direction X. The region corresponds to the waist circumference of the wearer and the vicinity thereof in the worn state. The waist elastic member 41 is disposed in a state of exhibiting elastic stretchability substantially over the entire length of the outer package 3 in the transverse direction Y. As a result, as shown in fig. 1, a substantially continuous annular waist gather WG is formed over the entire circumference of the waist opening WH.

As shown in fig. 1, a waistline gather BG is formed in the abdomen-side portion a and the back-side portion B. The hip gather of the abdomen-side portion a includes the abdomen-side exterior body 3A and a plurality of elastic members 42 for forming the hip gather fixed to the abdomen-side exterior body 3A. The hip gathers of the back portion B include a back-side exterior body 3B and a plurality of elastic members 42 for forming the hip gathers fixed to the back-side exterior body 3B. The elastic member 42 is disposed in a region overlapping the absorbent body 5 in the lateral direction Y when the diaper 1 is viewed in the longitudinal direction X. The elastic members 42 extend in the transverse direction Y and are disposed at intervals in the longitudinal direction X on the front-side outer package 3A and the back-side outer package 3B. The elastic member 42 is a plurality of linear or belt-like elastic members disposed in an extended state between the

outer layer sheets

31, 32 and the

inner layer sheets

33, 34. The hip gathers BG are formed by fixing the elastic members 42 to the back-side exterior body 3B in a state of being stretched in the lateral direction Y, and then releasing the elastic members 42 from the stretched state. When the diaper 1 is worn, the elastic members 42 contract to form a waistline gather BG in a region below the waistline gather WG. Hereinafter, the stretch region in the abdomen side portion a of the diaper 1 in which the hip gathers BG are formed is also referred to as an "abdomen side first stretch region X2".

The elastic member 42 disposed in the extended state on the back-side exterior body 3B in the range where the side seal S is formed is a back-side second elastic member extending in the lateral direction Y. When the diaper 1 is viewed in the longitudinal direction X, the elastic member 42 is disposed in a region where the back-side outer cover 3B and the absorbent body 5 overlap in the lateral direction Y. The stretch region in the back portion B of the diaper 1 in which the hip gathers BG are formed is also referred to as a "back-side second stretch region X3".

In the back-side second stretch region X3, the elastic member 42 located in the region from the lower end Sa of the side seal S in the longitudinal direction X to the upper end 5A of the absorbent body 5 is formed shorter than the other elastic members 42 so as not to be disposed in the central region 5A in the lateral direction Y of the absorbent body 5 in the region where the absorbent body 5 overlaps with the back-side exterior body 3B in the lateral direction Y. In the present embodiment, the elastic member 42 is not disposed in the central region 5A of the absorbent body 5, but when the elastic member 42 is also disposed in the central region 5A, it is preferably disposed so as not to exhibit stretchability.

The inner end 42a, which is one end of the elastic member 42, is fixed by the back-side second fixing portion 71 formed in the side region 5B adjacent to the central region 5A in the absorbent body 5.

As shown in fig. 2, the back-side outer package 3B has a back-side extension 39 extending from the lower end Sa of the side seal S to a crotch portion C located below the longitudinal center line CLx. The back-side extension 39 has a back-side expansion region X1 extending in the lateral direction and expandable and contractible in the lateral direction Y. The back-side extending portion 39 is formed with

bent portions

39a and 39b that are bent so that the length in the transverse direction Y gradually decreases toward the crotch portion C as the lower portion. The

bent portions

39a, 39b are formed from

side edges

39c, 39d of the back-side extension 39 in the lateral direction Y to terminal ends 39e, 39f on the center side. The width W in the lateral direction Y from the terminal end 39e to the terminal end 39f is formed wider than the width W1 in the lateral direction Y of the absorbent main body 2, and the absorbent main body 2 is formed so as not to protrude in the lateral direction Y from the back-side extending portion 39.

The back-side stretch region X1 includes leg

elastic members

43 and 43 extending in the transverse direction Y to be back-side first elastic members. At least a part of the leg

elastic members

43, 43 is disposed in the back-side stretch region X1 along the

bent portions

39a, 39b of the back-side extension portion 39 so as to draw a curve along the circumference of the leg of the wearer. The back-side stretch region X1 is stretchable by the leg

elastic members

43, 43 being disposed in an extended state. The leg

elastic members

43, 43 are formed of a plurality of linear or belt-like elastic members.

The outer ends 43a, 43a of the leg

elastic members

43, 43 are positioned and fixed on the side edges 39c, 39d of the back-side extending portion 39. Inner ends 43b, which are one end portions of the leg elastic members 43, are disposed near the terminal ends 39e, 39 f. These inner ends 43B, 43B do not reach the central region 5A of the absorbent main body 2 (absorbent body 5), but are disposed so as to reach the side regions 5B adjacent to the central region 5A. The inner ends 43B, 43B of the leg

elastic members

43, 43 are fixed by at least the back-side first fixing

portions

70, 70 formed in the

side regions

5B, 5B.

According to the diaper 1 of the present embodiment, the outer cover is divided into the front-side outer cover 3A and the back-side outer cover 3B, and the absorbent main body 2 using the thin absorbent sheet 51 is disposed in the crotch portion C, so that the wearer can move his or her legs easily, and the fit is good. Further, since the back-side extending portion 39 having the back-side stretchable region X1 which extends downward from the lower end Sa of the side seal S and is stretchable in the lateral direction Y is formed in the back-side outer package 3B, the fit around the buttocks and the appearance in the worn state are excellent like underwear.

Further, since the back-side stretch region X1 is stretchable by the leg elastic members 43, the feeling of stiffness of the back-side extending portion 39 in the crotch portion C can be further reduced. Therefore, the comfort of the wearer is improved, and the appearance in the worn state becomes like underwear, and an excellent appearance is exhibited. Further, since the leg elastic members 43 are not disposed in the central region 5A of the absorbent body 5, and the contraction action on the central region 5A can be reduced, deformation of the absorbent body 5 (absorbent sheet 51) in the central region 5A can be suppressed, which is preferable. In the following description, the back-side stretchable region X1 is also referred to as "back-side first stretchable region X1".

According to the diaper 1 of the present embodiment, the inner ends 43B, 43B of the leg

elastic members

43, 43 are fixed by the first back-

side fixing portions

70, 70 formed in the

side regions

5B, 5B of the absorbent body 5 adjacent to the central region 5A. Therefore, when the leg

elastic members

43, 43 are stretched when the diaper 1 is worn, the tensile force of each elastic member 43 acts outward in the lateral direction Y with respect to the side regions 5B of the absorbent body 5. Therefore, even with a thin absorbent body 5, it is possible to effectively prevent the occurrence of twisting or wrinkles in the lateral direction Y.

In addition, since the inner ends 42a of the elastic members 42 are fixed by the back-side second fixing portions 71 formed in the side regions 5B of the absorbent body 5 adjacent to the central region 5A, when the elastic members 42 are stretched when worn, the tensile force thereof acts on the side regions 5B of the absorbent body 5. With such a configuration, the absorbent body 5 can be more effectively prevented from being twisted or wrinkled in the lateral direction Y.

According to the diaper 1 of the present embodiment, the back-side stretchable region X1 is stretchable by the leg elastic members 43, and at least a part of the back-side stretchable region X1 is arranged so as to draw a curve along the circumference of the legs of the wearer. As a result, the stiffness of the back-side extending portion 39 in the crotch portion C can be reduced. Further, the appearance of the diaper 1 in the worn state is like underwear, and the diaper 1 has a good appearance.

In the present embodiment, the leg

elastic members

43, 43 are not disposed in the central region 5A of the absorbent body 5, but it is preferable that the leg

elastic members

43, 43 are disposed so as not to exhibit stretchability even when disposed in the central region 5A. In this case, it is advantageous in that the inner ends 43B, 43B are fixed by the first back-

side fixing portions

70, 70 formed in the side regions 5B, and thereby the occurrence of twisting or wrinkles in the lateral direction Y can be effectively prevented even in the thin absorbent body 5.

As shown in fig. 2, in the diaper 1, the back-side first stretch regions X1 formed by the leg

elastic members

43, 43 do not overlap the central region 5A of the absorbent body 5 in the lateral direction Y in plan view, and overlap the

side regions

5B, 5B adjacent to the central region 5A. The first backside fixing portion 70 serving as a fixing portion of the leg elastic member 43 and the second backside fixing portion 71 serving as a fixing portion of the elastic member 42 are disposed at a distance from each other in the longitudinal direction X. By adopting such a configuration, the total area of the both fixing portions becomes smaller than that in the case where the back-side first fixing portion 70 and the back-side second fixing portion 71 are integrated. In the back-side first fixing portion 70 and the back-side second fixing portion 71, the rigidity tends to be increased by the presence of the adhesive in general, and the rigidity can be reduced by narrowing the total area of both the fixing portions, and with this structure, the tensile force of the leg elastic members 43 can be effectively applied to the central region 5A of the absorbent body 5. As a result, the occurrence of twisting in the central region 5A can be effectively prevented, and the sandwiching of the absorber 5 between the buttocks due to twisting, the deterioration of the wearing appearance of the diaper 1, the occurrence of a feeling of discomfort in wearing the diaper 1, and the leakage of liquid can be effectively prevented.

As shown in fig. 2, 3, and 5, the back-side exterior body 3B and the absorbent body 2 are fixed to each other by a body fixing portion 73. The body fixing portion 73 is disposed so as to overlap the back-side first fixing portion 70 in a top plan view of the diaper 1. By overlapping the fastening portions in this manner, the tensile force of the leg

elastic members

43, 43 is effectively transmitted to the side regions 5B of the absorbent body 5 via the 2 fastening portions. This can effectively prevent the absorbent body 5 from being twisted or wrinkled in the lateral direction Y even when it is thin.

As shown in fig. 4 and 5, the absorbent main body 2 includes: a liquid-permeable topsheet 10 disposed in a position relatively close to the skin of the wearer; a back sheet 11 having liquid impermeability, or water repellency (in short, leakage resistance) disposed at a position relatively distant from the skin of the wearer; and an absorber 5 disposed between the front sheet 10 and the back sheet 11.

The absorbent body 5 includes an absorbent sheet 51, an auxiliary layer 52, and a core sheet (not shown) covering the outer surfaces of the absorbent sheet 51 and the auxiliary layer 52. These components constituting the absorbent main body 2 are integrated with each other by a known joining method such as an adhesive. As the components constituting the absorbent main body 2, those which can be generally used in such absorbent articles can be used without particular limitation, on the premise that the components are described later.

The topsheet 10 is passed across the skin-facing surface side of the absorbent body 5 (a pair of first standing parts 50 and non-standing parts 53 described later) in the transverse direction Y, and the extension parts 10E of the topsheet 10 from both side edges (the pair of first standing parts 50, the first stretchable region) along the longitudinal direction X of the absorbent body 5 are rolled up to the non-skin-facing surface side of the absorbent body 5.

In the present embodiment, the pair of

extension portions

10E, 10E of the topsheet 10 are fixed between the absorbent body 5 and the sheet 80 for forming a leakage prevention cuff, which will be described later, at the base end portion 81 of the leakage prevention cuff 8, which will be described later, respectively. The topsheet 10 does not cover the entire region of the non-skin-facing surface of the absorbent body 5, and the center portion (portion between the pair of proximal end portions 81, 81) in the transverse direction Y of the non-skin-facing surface of the absorbent body 5 is not covered with the topsheet 10 (extending portion 10E).

In the present embodiment, as shown in fig. 2, a pair of leakage

preventive cuffs

8, 8 and a pair of main body first

stretchable regions

90, 90 extending in the longitudinal direction X are disposed on both sides of the absorbent main body 2 (absorbent body 5) along the longitudinal direction X. The pair of leak-proof cuffs 8 and the pair of main body

first stretch regions

90 and 90 are disposed so as not to overlap the central region 5A in the lateral direction but to overlap the side regions 5B adjacent to the central region 5A. The main body

first stretch regions

90, 90 are disposed outside the pair of

leakage preventing flanges

8, 8 in the lateral direction Y.

More specifically, the main body

first stretch regions

90, 90 have a plurality of leg-surrounding elastic members 91 extending in the longitudinal direction X. The leg hole elastic members 91 are enclosed in the sheet 92 in an extended state so as to extend in the longitudinal direction X through the crotch portion C. The sheet 92 is joined to the absorbent body 5 side via the joining member 86. The first main body

stretchable regions

90, 90 are stretchable because the leg hole

elastic members

91, 91 are disposed in an extended state. The leg hole

elastic members

91, 91 are formed of a plurality of linear or band-shaped elastic members.

In the present embodiment, due to contraction of the leg hole elastic members 91, leg gathers LG are also formed in the left and right portions of the circumference of the legs of the wearer, that is, in both side portions in the longitudinal direction X of the diaper 1, as shown in fig. 1. As shown in fig. 2, the plurality of leg hole elastic members 91 are arranged such that one end 91a thereof is positioned in the back-side first expansion and contraction region X1 and the other end 91b thereof is positioned in the abdomen-side first expansion and contraction region X2. The entire length of the leg hole elastic members 91 in the longitudinal direction X is formed to have a length such that one end 91a is positioned in the dorsal first stretch region X1 and the other end 91b is positioned in the ventral first stretch region X2 in the extended state. That is, the leg hole elastic members 91 are arranged so as to have a length such that one end 91a does not overlap the back-side second expansion and contraction region (X3). As shown in fig. 2 and 5, the one end 91a is disposed so as to overlap the inner ends 43b, 43b of the leg

elastic members

43, 43 in the back-side first stretch region X1. In the present embodiment, the main body first expansion and

contraction regions

90, 90 do not overlap the back-side second expansion and contraction region X3, but overlap the abdominal-side first expansion and contraction region X2.

In the absorbent body 2, the sheet 92 is fixed to the front-side outer package 3A and the back-side outer package 3B by the

body fixing portions

72 and 73, whereby the front-side outer package 3A and the back-side outer package 3B are integrated.

As described above, in the diaper 1 of the present embodiment, the main body first stretchable zone 90 and the back-side first stretchable zone X1 included in the absorbent main body 2 overlap each other in the plan view of the diaper 1. Specifically, the inner ends 43b, 43b of the leg

elastic members

43, 43 are fixed so as to overlap the one ends 91a, 91a of the leg-surrounding

elastic members

91, 91. Therefore, when the back-side first stretch region X1 extends and the leg

elastic members

43, 43 extend when the diaper 1 is worn, the leg-surrounding

elastic members

91, 91 also extend outward in the longitudinal direction X in conjunction with this extension. Accordingly, in the

side regions

5B, 5B of the absorbent body 5 where the two are superposed, the pulling forces of the leg

elastic members

43, 43 and the leg hole

elastic members

91, 91 act on the back side outward in the lateral direction Y and outward in the longitudinal direction X, and therefore, even in a thin absorbent body 5, it is possible to effectively prevent the occurrence of twisting or wrinkling in both the longitudinal direction X and the lateral direction Y.

Further, since the main body first stretchable region 90 and the back-side second stretchable region X3 including the plurality of elastic members 42 do not overlap with each other, the force applied in the longitudinal direction X can be appropriately suppressed particularly on the back side of the thin absorbent sheet 51. As a result, the absorbent sheet 51 is less likely to twist or wrinkle near the buttocks, and an effect of obtaining good fit and wearing appearance is obtained.

In the diaper of the present embodiment, the abdominal-side first stretchable region X2 provided in the abdominal-side outer package 3A overlaps the main body first stretchable region 90. Specifically, the elastic member 42 of the abdominal-side first stretch region X2 and the other ends 91b and 91b of the leg hole

elastic members

91 and 91 are fixed to the abdominal-side outer package 3A in an overlapping state. With such a configuration, when the abdomen-side first stretch region X2 is stretched and the plurality of elastic members 42 are stretched when the diaper 1 is worn, the leg hole

elastic members

91 and 91 are also stretched outward in the longitudinal direction X in conjunction with this stretch region. Thus, the tensile forces of the elastic members 42 and the leg hole

elastic members

91 and 91 act on the

side regions

5B and 5B of the absorbent body 5, which are the regions where the elastic members overlap each other, in the lateral direction Y and the longitudinal direction X. As a result, even if the absorbent sheet 51 is thin, it is possible to effectively prevent the occurrence of twisting or wrinkles in both the longitudinal direction X and the lateral direction Y.

The leakage preventive cuff 8 has a base end portion 81 to which a leakage preventive cuff forming sheet 80 is fixed to another member, and a rising portion 82 from which the sheet 80 rises toward the wearer. The base end portion 81 is a portion serving as a standing base end when the standing portion 82 stands up toward the skin of the wearer when the diaper 1 is worn. The leakage preventive cuff-forming sheet 80 is fixed to another member, for example, the back sheet 11, by a known fixing method such as an adhesive such as hot melt or thermal fusion. The free end portion of the standing portion 82 (the portion of the standing portion 82 closest to the skin of the wearer when standing up) is disposed so that the elastic member 83 for forming the leakproof cuff extends in the longitudinal direction X. The elastic member 83 for forming the leakage preventing cuffs is fixed in an extended state between the sheets 80, 80 for forming the leakage preventing cuffs having a two-layer structure by a fixing method such as an adhesive. The number of the elastic members 83 is not particularly limited, and may be 1 or more.

When the diaper 1 is worn, the standing portion 82 stands up toward the skin of the wearer with the base end portion 81 as the standing base end by the contraction force of the elastic member 83 for forming the leakage prevention cuff. In such a standing state of the leakage preventing cuff 8, the standing portion 82 blocks the movement of bodily fluid such as urine excreted by the wearer to the outside in the lateral direction Y, and therefore, the effect of blocking bodily fluid by the pair of standing

portions

50, 50 on both sides in the lateral direction Y of the absorbent body 5 described later is combined with each other, and side leakage can be effectively suppressed.

In the standing state of the leakage preventing cuffs 8, the entire diaper 1 is bent and deformed so that the central region 5A in the longitudinal direction X of the absorbent main body 2 is projected toward the non-skin-facing surface side (back sheet 11 side) by the contractive force of the elastic member 83 for forming the leakage preventing cuffs, and therefore, the diaper 1 is easily fitted to the body shape of the wearer. Furthermore, the rising portion 82 preferably extends outward in the longitudinal direction X beyond the back-side end portion 52d of the auxiliary layer 52 on the back side, and therefore the rising portion 82 can be raised more reliably.

As shown in fig. 4, the absorbent body 5 has: a pair of standing

parts

50, 50 which are located at both

side regions

5B, 5B with the center region 5A of the absorbent body 5 in the transverse direction Y at least in the crotch part C and stand up toward the skin of the wearer when worn; and a non-rising portion 53 located in the central region 5A and sandwiched between the pair of rising

portions

50, 50.

Specifically, as shown in fig. 4 and 5, the side elastic members 9 for raising the raised portions 50 are disposed at or near both side edges along the longitudinal direction X of the absorbent body 5 (specifically, for example, in an area within 15mm from the side edges along the longitudinal direction X of the absorbent body 5). The side elastic members 9 are disposed between the topsheet 10 and the absorbent sheet 51. That is, the absorbent main body 2 has a pair of standing

portions

50, 50 extending in the longitudinal direction X formed on both sides of the absorbent body 5. The rising

portions

50, 50 extend outward in the longitudinal direction X beyond the back-side end portion 52d of the auxiliary layer 52. The side elastic members 9 are disposed between the absorbent sheet 51 and the topsheet 10 in a state of being stretched in the longitudinal direction X, and are fixed to at least the absorbent sheet 51 and further to the topsheet 10 by a known fixing method such as an adhesive. The side elastic members 9 are disposed at least in the crotch portion C, and may be 1 as shown in the figure or plural.

The rising

portions

50 and 82 do not necessarily have to exceed the back-side end portion 52d of the auxiliary layer 52, and the rising portions 550 and 82 can be sufficiently raised as long as they extend at least to the vicinity of the back-side end portion 52 d. The vicinity here means within a design allowable range in the longitudinal direction X based on the fact that the end edge position of the rising portion 50 (the end edge position of the side elastic member 9) and the end edge position of the rising portion 82 (the end edge position of the elastic member 83) in the longitudinal direction X coincide with the back-side end portion 52d in the longitudinal direction X. For example, the vicinity is defined as the range of ± 35mm with respect to the rising portion 50 and the range of ± 10mm with respect to the rising portion 82 when the back-side end portion 52d is set as the reference position in the vertical direction.

In the present embodiment, the side elastic members 9 are fixed in an extended state on both side portions in the lateral direction Y of the absorbent member 5, and thus, when the diaper 1 is worn, the both side portions in the lateral direction Y of the absorbent member 5 stand up toward the skin of the wearer as the pair of standing

portions

50, 50 by contraction of the side elastic members 9. In this case, the absorbent body 5 is formed into a tray shape having the non-standing portion 53 as a bottom portion and the pair of standing

portions

50, 50 extending obliquely from the bottom portion toward the skin of the wearer as side portions in a cross-sectional view along the lateral direction Y.

As described above, in the present embodiment, the elastic member and the elastic region having the elastic function of the diaper 1 are connected to the

side regions

5B and 5B of the thin absorbent body 5 via the fixing portions. Therefore, when the elastic members and the elastic zones elastically deform during wearing of the diaper 1, the deformation is transmitted to the

side regions

5B and 5B of the absorbent body 5. As a result, a tensile force in the stretching direction (for example, outward in the lateral direction Y) acts on the

side regions

5B, 5B of the absorbent body 5, and therefore the absorbent body 5 extends in the stretching direction. With this configuration, the absorbent body 5 can be effectively prevented from being twisted or wrinkled when worn.

As materials of various elastic members in the diaper 1 represented by the side elastic member 9, various known elastic materials generally used in such absorbent articles can be used without particular limitation unless otherwise specified, and examples thereof include synthetic rubbers such as styrene-butadiene, isoprene, chloroprene rubber, natural rubbers, EVA, stretchable polyolefins, polyurethane, and the like. As the form of the elastic member, a form of a thread (such as thread rubber) or a string (such as flat rubber) having a rectangular, square, circular, polygonal, or the like cross section, a form of a multifilament thread, or the like can be preferably used.

In the present embodiment, the description has been made using an example in which the auxiliary layer 52 is provided as a structure of the absorber 5. The absorbent body 5 has a rectangular shape in plan view, and is disposed in the central region 5A of the absorbent body 5 by being disposed at the center of the absorbent sheet 51 in the lateral direction Y so that the long side thereof extends along the longitudinal direction X. The auxiliary layer 52 is disposed in a region where the back-side stretch region X1 and the absorbent body 5 overlap in the transverse direction Y when the diaper 1 is viewed in the longitudinal direction X. That is, in the absorbent body 5, the central region 5A has a multilayer structure in which the absorbent sheet 51 and the auxiliary layer 52 are stacked, and the

side regions

5B and 5B adjacent to the central region 5A have a single-layer structure in which the absorbent sheet 51 is separated. The auxiliary layer 52 is formed to have the same thickness and the same density (grammage) in the longitudinal direction X and the transverse direction Y. Therefore, the central region 5A of the absorber 5 has higher rigidity than the

side regions

5B and 5B.

When the auxiliary layer 52 is disposed in the central region 5A (non-standing portion 53) in the lateral direction Y, the bending start point when the pair of standing portions 50 perform the standing operation can be formed by the corner portions 52a1, 52b1 located at the

end portions

52a, 52b in the lateral direction Y of the auxiliary layer 52. Therefore, when worn, the rising operation of the pair of rising portions 50 rising up in the crotch portion C can be performed more reliably, and the fit is improved. Further, when the pair of rising portions 50 extend beyond the back-side end portion 52d of the auxiliary layer 52 on the back-side exterior body 3B side, the rising operation of the rising portions 50 rising up in the crotch portion C can be performed more reliably, and the fit is improved.

According to the diaper 1 of the present embodiment, the length of the back-side extending portion 39 in the lateral direction Y becomes shorter downward, so that the feeling of stiffness of the back-side extending portion 39 in the crotch portion C can be reduced. As a result, the comfort of the wearer is improved, the fit feeling is further improved, and the appearance in the worn state becomes the underwear appearance, and a good appearance is presented.

The auxiliary layer 52 is preferably a layer composed of a mixed fiber-volume body containing at least water-absorbent natural fibers and an absorbent polymer. The mixed fiber-forming body may be formed of, for example, only water-absorbent natural fibers and an absorbent polymer, or may be formed by adding another material, for example, synthetic fibers, to the water-absorbent natural fibers and the absorbent polymer. With this structure, the absorbent body 5 and the absorbent sheet 51 are matched with each other to obtain high liquid absorption properties.

Next, the length of the auxiliary layer 52 in the longitudinal direction X will be described. As shown in fig. 8, the length L of the auxiliary layer 52 from the back-side end 52d to the stomach-side end 52c on the opposite side thereof,

is formed longer than a length L1 from the end 52a to the end 52b in the transverse direction Y. In the present embodiment, the back-side end 52d is disposed on the absorbent sheet 51 so as to be located substantially at the center of the back-side stretchable region X1 of the back-side extension 39 in the longitudinal direction X, and the stomach-side end 52c is located near the longitudinal centerline CLx. If the auxiliary layer 52 is disposed closer to the back-side outer cover 3B in this manner, the rigidity of the absorbent body 5, particularly the buttocks or the vicinity of a cleft between the buttocks of the wearer, can be improved. This can effectively prevent the occurrence of distortion or wrinkles at these portions.

As another arrangement of the auxiliary layer 52, for example, as shown in fig. 8, the lower end Sa of the side seal S, which is the starting position of the back-side stretch region X1, may be arranged so as to match (e.g., align) the position of the back-side end 52d, from the viewpoint of further improving the rigidity on the hip side. In this case, the length L (total length) of the auxiliary layer 52 is preferably at least the length of the back-side stretchable region X1.

Next, a modification of the auxiliary layer will be described with reference to fig. 9. The auxiliary layer 152 shown in the figure is disposed in the central region 5A in the lateral direction Y of the absorbent sheet 51. The auxiliary layer 152 has a substantially rectangular shape extending from the back-side package 3B to the front-side package 3A, and a widened portion 153 is formed on the front-side end 152c side. The auxiliary layer 152 is fixed to the absorbent sheet 51 such that the back-side end 152d located on the back side of the auxiliary layer 152 overlaps the back-side stretchable region X1 of the back-side outer package 3B and the widened portion 153 overlaps the abdominal circumference stretchable region X2 of the abdominal-side outer package 3A in plan view. The end surfaces 152a, 152b of the auxiliary layer 152 other than the widened portion 153 extend in the longitudinal direction X in plan view, and the width of the

end surfaces

152a, 152b substantially matches the width L1 of the back-side end 152 d.

The widened portion 153 is a portion whose length in the lateral direction Y increases from the back-side exterior body 3B to the abdomen-side exterior body 3A, and the width L2 thereof is formed longer than the width L1 of the back-side end 152 d. The widened portion 153 is formed as an inclined surface at the

end surfaces

153a, 153b in the lateral direction Y so that the length in the lateral direction Y continuously increases in order to fit the outer shape of the leg when worn. The inclined portion is disposed so as to overlap the lower end edge 3Aa of the abdominal-side outer package 3A in a plan view. The widened portion 153 may be gradually increased, instead of being continuously increased in length in the lateral direction Y. In the present embodiment, the lower edge 3Aa of the abdomen-side exterior body 3A is disposed so as to overlap the widened portion 153.

The auxiliary layer 152 preferably has a length extending from the back-side outer package 3B to the front-side outer package 3A, because the rigidity of the absorbent body 5 can be increased over the entire region in the longitudinal direction X of the crotch portion C. Further, the widened portion 153 formed so that the length in the lateral direction Y continuously increases is preferably arranged on the abdominal-side outer package 3A side, because the liquid absorption capacity of the absorbent body 5 on the abdominal side can be secured.

Since the end surfaces 153A and 153b inclined so as to overlap the lower end edge 3Aa of the abdomen-side outer package 3A are located at the widened portion 153, the widened portion 153 deforms along the leg circumferences when the diaper is worn. Therefore, the fit when worn is improved, and it is easy for the wearer to move the legs. Further, the auxiliary layer 152 preferably overlaps the back-side stretchable region X1 of the back-side outer cover 3B in plan view, and the widened portion 153 overlaps the waistline stretchable region X2 of the abdomen-side outer cover 3A, so that the fit when worn is further improved.

In the above-described embodiment, the auxiliary layer 52 is formed to have the same density (grammage) in the longitudinal direction X and the transverse direction Y with the same thickness, but may have a structure having low-rigidity portions 521 extending in the longitudinal direction X and having lower rigidity than other portions of the auxiliary layer 52 as shown in fig. 10. The low rigidity portion 521 is a groove-like depression recessed from the auxiliary layer 52 toward the absorbent sheet 51, and is a plurality of low rigidity portions extending in the longitudinal direction X and arranged in the transverse direction Y in the central region of the absorbent body 5. The low rigidity portion 521 is not limited to a plurality of portions, and may be a single low rigidity portion formed of 1 low rigidity portion 521, for example.

In the absorbent body 5, the portion overlapping with the groove-like recess in a plan view has a lower grammage than the periphery thereof, that is, the mass per unit area (grammage) of the forming material is smaller than the periphery, and the portion becomes the low rigidity portion 521.

One end 521a of the low rigidity portion 521 located on the abdominal-side exterior body 3A side extends beyond the lower end edge 3Aa of the abdominal-side exterior body 3A to a position overlapping the hip gather BG. The other end 521B of the low rigidity portion 521 located on the rear side exterior body 3B side does not reach the rear side exterior body 3B.

In this way, when the low rigidity portions 521 are formed locally on the auxiliary layer 52, the rigidity of the auxiliary layer 52, and hence the rigidity of the absorbent body 5, can be easily adjusted by adjusting the number of the low rigidity portions 521, the length in the longitudinal direction X, or the length (width) in the lateral direction Y. Further, when the low rigidity portion 521 is formed as a groove-like recess, it is more preferable because it is positioned on the side of being in contact with the skin of the wearer when worn, and thus it can function as a liquid guide channel.

In the above-described embodiment, the leg

elastic members

43 and 43 are disposed in the back-side stretchable region X1 of the back-side outer cover 3B, but the configuration other than the leg

elastic members

43 and 43 described in the above-described embodiment can be applied to the diaper 1 having another back-side outer cover.

For example, in the diaper 1A shown in fig. 11, the structure of the back-side exterior body is different from the above-described embodiment. Specifically, the structure of the elastic member provided in the back-side stretchable region X1 of the back-side extended portion 39 in the back-side outer cover in the diaper 1A shown in fig. 11 is different from that in the previous embodiment. The elastic member 47 is an elastic member linearly arranged in an extended state along the lateral direction Y, and allows the back-side exterior body to expand and contract in the lateral direction Y.

The elastic member 47 is a plurality of linear or belt-like elastic members disposed in an extended state between the outer layer sheet 32 and the inner layer sheet 34, similarly to the elastic member 41. The elastic members 47 extend in the lateral direction Y and are disposed at intervals in the longitudinal direction X on the back-side exterior body 3B. Therefore, the back-side outer cover can form a gather similar to the waistline gather BG produced by the elastic member 41 in the back-side extending portion 39. The elastic member 47 is not disposed in the central region of the absorbent body 5, but is cut in the lateral direction Y with the absorbent body 5 as a boundary. The diaper 1A having such a configuration can provide the same operational advantages as those of the diaper 1 of the embodiment described above.

Next, a preferred embodiment of the absorbent sheet 51 will be described with reference to fig. 6 and 7. The absorbent sheet 51 is a thin absorbent sheet having a first fibrous sheet 511, a second fibrous sheet 512, and a plurality of particles of an absorbent polymer 513 disposed between the two

sheets

511 and 512. The two

sheets

511, 512 are bonded to each other by an adhesive 514. In the illustrated embodiment, the adhesive 514 is disposed on the inner surface (the surface facing the absorbent polymer 513) of each of the two

sheets

511 and 512. The plurality of particles of the absorbent polymer 513 are arranged in a uniform manner in the plane direction of the absorbent sheet 51, and form an arrangement region of the absorbent polymer 513.

In the arrangement region of the absorbent polymer 513 in the absorbent sheet 51, the absorbent polymer 513 is arranged so that a gap that can be seen macroscopically is not observed. The phrase "the gaps that cannot be seen macroscopically" as used herein means that the absorbent polymers 513 are arranged so as to cover the entire surface (without omission) of one surface of the fibrous sheet, but when the regions are seen microscopically, it is permissible to form unintended gaps between the absorbent polymers 513. The gap is about 10 to 1000 μm. In the following description, the voids between the absorbent polymers 513 observed microscopically in the arrangement region of the absorbent polymers 513 are also referred to as "microscopic voids".

In the arrangement region of the absorbent polymer 513, there is a region 515 where the first fiber sheet 511 and the second fiber sheet 512 are directly bonded to each other with the adhesive 514 without interposing the absorbent polymer 513 therebetween (hereinafter, this region is also simply referred to as "direct bonding region"). The direct bonding sites 515 are formed in the microscopic voids described above, respectively. In the direct bonding portion 515, the adhesive 514 is in a columnar shape when viewed in a cross section in the sheet thickness direction, and directly bonds the two

sheets

511 and 512 to each other. When the absorbent sheet 51 is viewed in the sheet plane direction, the direct bond sites 515 are formed in a plurality of regular or irregular scattered points. By forming the direct bond sites 515, the absorbent polymer 513 can be held at a predetermined position of the absorbent sheet 51, and the liquid absorbability of the absorbent polymer 513 can be sufficiently exhibited. The direct bonding site 515 can be formed by appropriately adjusting, for example, the grammage or particle size of the absorbent polymer 513 or the amount and area of the adhesive 514 applied.

As shown in fig. 6 and 7, the absorbent sheet 51 preferably has not only a direct bond site 515 but also a site (hereinafter, also referred to as an "indirect bond site") 516 where the two

sheets

511 and 512 are bonded to each other with an adhesive 514 through an absorbent polymer 513. In the indirect joining portion 516, the application portion of the adhesive 514 in the first fiber sheet 511, the existing portion of the absorbent polymer 513, and the application portion of the adhesive 514 in the second fiber sheet 512 overlap in the thickness direction. With such a configuration, the absorbent polymer 513 can be held at a predetermined position of the absorbent sheet 51, and the accidental movement or bias of the absorbent polymer 513 can be further reduced, and the liquid absorbency of the absorbent sheet 51 can be further improved.

As the adhesive 514, an adhesive having flexibility that can be stretched according to the swelling change of the absorbent polymer 513 accompanying the liquid absorption can be preferably used. Examples of such raw materials include one or more acrylic adhesives such as (co) polymers of vinyl monomers represented by 2-ethylhexyl acrylate, butyl acrylate, ethyl acrylate, cyanoacrylate, vinyl acetate, methyl methacrylate, and the like (e.g., ethylene-vinyl acetate copolymers), silicone adhesives such as polydimethylsiloxane polymers, natural rubber adhesives such as natural rubber, isoprene adhesives such as polyisoprene, chloroprene, and the like, styrene-butadiene copolymers (SBR), styrene-isoprene-styrene block copolymers (SIS), styrene-butadiene-styrene block copolymers (SBS), styrene-ethylene-butadiene-styrene block copolymers (SEBS), and the like, And a rubber adhesive such as a styrene adhesive containing one or more styrene-ethylene-propylene-styrene block copolymers (SEPS). 1 of them may be used alone or 2 or more may be used in combination. As shown in fig. 6, when the adhesive 514 is disposed on the surface (inner surface) of each

sheet

511 and 512 facing the absorbent polymer 513, the adhesive 514 disposed on the first fiber sheet 511 and the adhesive 514 disposed on the second fiber sheet 512 may be of the same type or different types.

Among them, from the viewpoint that they are excellent in flexibility and stretchability, exhibit a contractive force while maintaining a state of direct bonding between the two

sheets

511 and 512 even after swelling of the absorbent polymer 513, and easily hold the absorbent polymer 513 between the two

sheets

511 and 512, it is preferable to use a rubber adhesive as the adhesive 514, and a styrene adhesive is more preferable to use a rubber adhesive.

The adhesive 514 is preferably a hot-melt adhesive from the viewpoint of satisfying both flexibility of the adhesive and adhesiveness to the sheet. The hot melt adhesive may contain, for example, a tackifier such as a petroleum resin or a polyterpene resin, a plasticizer such as a paraffin oil, and optionally an antioxidant such as phenols, amines, phosphorus, and benzimidazoles.

According to the absorbent sheet 51 having the above-described structure, an appropriate bonding force can be exerted between the

fiber sheets

511 and 512 to such an extent that the absorbent polymer 513 does not move or fall off by the adhesive 514 present at the direct bonding portion 515, and the absorbent polymer 513 can be supported at an appropriate position between the

fiber sheets

511 and 512. Further, since the absorbent polymer 513 exhibits a moderate bonding force to such an extent that it can sufficiently swell, the liquid absorbency of the absorbent polymer 513 can be sufficiently exhibited. According to the preferred embodiment of the present invention, since the adhesive 514 has elasticity, a balance between the force of extension of the adhesive 514 existing in the directly bonded part 515 due to swelling of the absorbent polymer 513 and the force of contraction of the adhesive 514 according to this tends to occur, and it is possible to efficiently exhibit a bonding force capable of satisfying both the support of the absorbent polymer 513 at an appropriate position and the securing of a space in which the absorbent polymer 513 can swell. As a result, the liquid absorbency of the absorbent sheet 51 is further improved.

The adhesive 514 is preferably applied to the inner surface of each of the two

sheets

511, 512, i.e., opposite the absorbent polymer 513. With such a configuration, the adhesives 514 applied to the two

sheets

511 and 512 can be bonded to each other, the direct-bonded portions 515 can be efficiently formed in the absorbent sheet 51, and both the holding of the absorbent polymer 513 at an appropriate position and the securing of a space in which the absorbent polymer 513 can swell can be achieved. In addition, since the adhesive 514 can easily exist in the space between the fibers constituting the two

sheets

511 and 512, there is an advantage that peeling is not easily generated at the interface between the two

sheets

511 and 512 and the adhesive 514.

From the viewpoint of suppressing the accidental movement or falling off of the absorbent polymer 513 and further improving the absorption rate of the liquid, as shown in fig. 6 and 7, it is preferable that the adhesive 514 is discontinuously applied in such a manner as to have a non-application portion in the joining region with the second fiber sheet 512 in the first fiber sheet 511, and the adhesive 514 is continuously applied without a gap in the entire joining region with the first fiber sheet 511 in the second fiber sheet 512. Further, the surface of the first fibrous sheet 511 where the adhesive 514 is not present, that is, the outer surface of the absorbent sheet 51 on the first fibrous sheet 511 side, is preferably used as the liquid receiving surface, which is the surface of the absorbent sheet 51 that first comes into contact with liquid. The junction region refers to a region where the absorbent polymer 513 is disposed so that a gap that can be macroscopically seen cannot be observed.

Examples of the form in which the adhesive 514 is discontinuously applied to the first fiber sheet 511 so as to have a non-application portion include a spiral shape, a peak shape, an omega shape, a curtain shape, and a stripe shape. In the present embodiment, the adhesive 514 applied to the first fiber sheet 511 has a spiral shape.

The thickness of the absorbent sheet 51 is, for example, 4.9mN/cm ² (＝0.5gf/cm ² ) The thickness measured under pressure of (2) is preferably 0.3mm or more, more preferably 0.6mm or more, and preferably 5mm or less, more preferably 2mm or less.

The proportion of the particles of the absorbent polymer 513 in the absorbent sheet 51 (hereinafter also referred to as "SAP proportion") is, for example, preferably 60% by mass or more, more preferably 70% by mass or more, and preferably 95% by mass or less, more preferably 90% by mass or less.

When such an absorbent sheet 51 is used, it can be formed to be thin while maintaining the absorption performance.

The SAP ratio is measured, for example, by the following method.

(1) An absorbent sheet 51 is formed from the diaper 1 in a predetermined area (e.g., 9 cm) ² ～100cm ² ) And (6) taking out. In this case, attention is paid to cutting the absorbent sheet 51 only at a portion where the gap between the absorbent polymers 513 cannot be observed macroscopically.

(2) The absorbent sheet 51 is decomposed using a solvent dissolving the adhesive, and the 2

fibrous sheets

511 and 512 and the absorbent polymer 513 are separated.

(3) The mass of the

fiber sheets

511, 512 and the mass of the absorbent polymer 513 were measured.

(4) The SAP ratio was calculated according to the following equation.

SAP ratio ((mass of absorbent polymer 513)/(mass of absorbent polymer 513 + mass of each of the fiber sheets 511 and 512)) × 100

The thickness of the absorbent sheet 51 was measured using a KES-G5 hand-held compression tester manufactured by KATO TECH. More specifically, the absorbent sheet 51 was mounted on a test stand of a measuring apparatus and had an area of 2cm ² By compressing the sample between the plywood plates of the circular plane, thereby applying 4.9mN/cm to the absorbent sheet 51 ² (＝0.5gf/cm ² ) The load of (2). The thickness of the absorbent sheet 51 is measured in this state. The compression speed was set to 0.5mm/sec, and the maximum compression load was set to 490mN/cm ² (＝50gf/cm ² )。

The absorbent sheet may have a structure other than the structure described as the absorbent sheet 51. For example, there can be mentioned a sheet in which water-absorbent fibers are mixed by sandwiching sheets by pressing and embossing without using an adhesive.

The present invention has been described above based on preferred embodiments thereof, but the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope of the present invention unless otherwise specified.

For example, as shown in fig. 12, the backside extension 39 may be rectangular in plan view.

As shown in fig. 13, the absorbent body 5 may have a structure having an absorbent sheet 51 without the auxiliary layer 52.

The auxiliary layer 52 may be disposed over the entire region of the region where the back-side stretch region X1 and the absorbent body 5 overlap in the lateral direction Y when the diaper 1 is viewed in the longitudinal direction X.

The present invention further discloses the following pants-type absorbent article according to the above embodiment.

<1>

A pants-type absorbent article having a front-side outer covering disposed on the front side of a wearer, a back-side outer covering disposed on the back side of the wearer, and an absorbent body fixed to the outer coverings so as to be interposed between the front-side outer covering and the back-side outer covering, and having a longitudinal direction extending between the front-side outer covering and the back-side outer covering and a lateral direction orthogonal to the longitudinal direction, and having a side seal formed by joining both side portions of the front-side outer covering and the back-side outer covering to each other,

the absorbent main body includes an absorbent body having absorbent sheets having 2 fibrous sheets, which are the same or different, and particles of absorbent polymer disposed between the fibrous sheets,

the back-side outer package body has a back-side extension portion extending downward from the side seal portion,

the dorsal extension having a dorsal first telescopic region extending along the lateral direction and being telescopic along the lateral direction,

<2> the pants-type absorbent article according to <1>, wherein,

the back-side first stretchable region is stretchable by being provided with a back-side first elastic member extending in the lateral direction,

one end portion of the back-side first elastic member is fixed at least by a back-side first fixing portion of the side region adjacent to the central region formed in the absorbent body,

the back-side outer cover has a second back-side stretchable region in which a second back-side elastic member extending in the lateral direction is arranged in a region where the back-side outer cover and the absorbent body overlap in the lateral direction when the absorbent article is viewed in the longitudinal direction in a region where the side seal is formed,

the back-side second elastic member is not disposed in the widthwise central region of the absorbent body, or is disposed so as not to exhibit stretchability when disposed in the central region,

one end portion of the back-side second elastic member is fixed at least by a back-side second fixing portion formed in the side region adjacent to the central region in the absorbent body.

<3> the pants-type absorbent article according to <2>, wherein,

the back-side first fixing portion and the back-side second fixing portion are spaced apart in the longitudinal direction.

<4> the pants-type absorbent article according to <3>, wherein,

at least a portion of the back-side first elastic member is configured in a manner to trace a curve along a circumference of a leg of a wearer.

<5> the pants-type absorbent article according to any one of <2> to <4>, wherein,

the back-side outer cover and the absorbent main body are fixed by a main body fixing portion,

the main body fixing portion overlaps with the back-side first fixing portion in a plan view of the absorbent article.

<6> the pants-type absorbent article according to any one of <1> to <5>, wherein,

a main body first stretchable region extending in the longitudinal direction is provided on both sides of the absorbent body,

the main body first stretchable region overlaps with the back-side first stretchable region in a plan view of the absorbent article.

<7> the pants-type absorbent article according to any one of <2> to <5>, wherein,

the absorbent main body has main body first stretchable regions extending in the longitudinal direction on both sides of the absorbent body,

the main body first telescoping zone does not overlap the backside second telescoping zone.

<8> the pants-type absorbent article according to <7>, wherein,

the ventral outer cover has a ventral first stretchable region having stretchability in the lateral direction,

the first telescopic region of the main body overlaps with the first telescopic region of the ventral side.

<9> the pants-type absorbent article according to any one of <1> to <8>, wherein,

the absorbent body has an auxiliary layer superposed on the absorbent sheet,

the auxiliary layer is composed of a mixed fiber assembly containing at least water-absorbent natural fibers and an absorbent polymer.

<10> the pants-type absorbent article according to <9>, wherein,

a pair of leakage-preventing cuffs extending in the longitudinal direction are provided on both sides of the absorbent main body in the longitudinal direction,

the leakage preventing flange has a rising part rising toward the wearer,

the rising portion extends outward in the longitudinal direction X so as to extend beyond a back-side end portion of the auxiliary layer located on the back side.

<11> the pants-type absorbent article according to <10>, wherein,

side elastic members for raising the raised portions are disposed at or near both side edges of the absorbent body in the longitudinal direction.

<12> the pants-type absorbent article according to <9>, wherein,

the auxiliary layer has a widened portion that increases in length in the lateral direction from the back-side exterior body to the front-side exterior body.

<13> the pants-type absorbent article according to <12> wherein,

the auxiliary layer has the widened portion at a position at or near a lower end edge of the abdominal-side outer covering, and the length of the auxiliary layer in the lateral direction continuously increases at the widened portion.

<14> the pants-type absorbent article according to <12> or <13>, wherein,

the abdominal-side outer package has an abdominal-side first stretchable region having stretchability in the lateral direction,

the abdomen-side first stretchable region overlaps the widened portion in a plan view of the absorbent article.

<15> the pants-type absorbent article according to <13> or <14>, wherein,

the lower end edge of the ventral-side outer body overlaps the widened portion.

<16> the pants-type absorbent article according to any one of <1> to <15>, wherein,

the back-side extension portion is formed with a curved portion that curves so that the lateral length thereof becomes gradually shorter toward a crotch portion as a lower portion.

<17> the pants-type absorbent article according to any one of <1> to <16>, wherein,

the back-side extension is formed to have a width in a lateral direction from a terminal end of one side to a terminal end of the other side larger than a width in the lateral direction of the absorbent main body.

<18> the pants-type absorbent article according to any one of <1> to <17>, wherein,

the absorbent main body has a liquid-permeable topsheet arranged at a position relatively close to the skin of the wearer,

the topsheet transversely crosses the skin-facing surface side of the absorbent body, and the extensions of the topsheet extending from both side edges of the absorbent body in the longitudinal direction are rolled up on the non-skin-facing surface side of the absorbent body.

<19> the pants-type absorbent article according to any one of <1> to <18>, wherein,

the pair of leakage-preventing cuffs are provided so as to overlap the back-side first stretchable region when the pants-type absorbent article is viewed in plan.

<20> the pants-type absorbent article according to any one of <1> to <19>, wherein,

the rigidity of the central region of the absorber is higher than the rigidity of the side regions of the absorber.

<21> the pants-type absorbent article according to any one of <1> to <20>, wherein,

the auxiliary layer has a low-rigidity portion extending in the longitudinal direction and having a rigidity lower than other portions in the auxiliary layer.

<22> the pants-type absorbent article according to <21>, wherein,

one end of the low rigidity portion located on the front side outer covering reaches a position overlapping with a hip fold of the front side outer covering beyond a lower end edge of the front side outer covering.

<23> the pants-type absorbent article according to any one of <1> to <22>, wherein,

in the arrangement region of the absorbent polymer in the absorbent sheet, the absorbent polymer is arranged so that a macroscopically visible gap is not observed.

<24> the pants-type absorbent article according to <23>, wherein,

the 2 fibrous sheets have portions directly joined by an adhesive without the absorbent polymer.

<25> the pants-type absorbent article according to any one of <1> to <24>, wherein,

the proportion of the absorbent polymer particles in the absorbent sheet is preferably 60% by mass or more, more preferably 70% by mass or more, and is preferably 95% by mass or less, more preferably 90% by mass or less.

<26> the pants-type absorbent article according to any one of <1> to <25>, wherein,

while applying 4.9mN/cm ² (＝0.5gf/cm ² ) The thickness of the absorbent sheet measured under the pressure of (2) is preferably 0.3mm or more, more preferably 0.6mm or more, and preferably 5mm or less, more preferably 2mm or less.

Industrial applicability of the invention

According to the pants-type absorbent article of the present invention, deformation of the absorber can be prevented without impairing the fit of the thin absorber. Further, according to the pants-type absorbent article of the present invention, the wearer can easily move the legs. Further, according to the pants-type absorbent article of the present invention, the appearance in a worn state is good like underwear.

Claims

1. A pants-type absorbent article having an abdominal-side outer cover disposed on an abdominal side of a wearer, a back-side outer cover disposed on a back side of the wearer, and an absorbent body fixed to the abdominal-side outer cover and the back-side outer cover so as to be stretched between the abdominal-side outer cover and the back-side outer cover, and having a longitudinal direction extending between the abdominal-side outer cover and the back-side outer cover and a transverse direction orthogonal to the longitudinal direction, and having a side seal formed by joining both side portions of the abdominal-side outer cover and the back-side outer cover to each other, the pants-type absorbent article being characterized in that:

the back-side outer package has a back-side extension portion extending downward from the side seal portion,

the dorsal extension having a dorsal first expansion region extending along the lateral direction and being expandable and contractible along the lateral direction,

2. A pant-type absorbent article according to claim 1, wherein:

one end of the back-side first elastic member is fixed at least by a back-side first fixing portion formed in the absorbent body in the side region adjacent to the central region,

the back-side exterior body has a back-side second stretchable region in which a back-side second elastic member extending in the transverse direction is arranged in a region where the back-side exterior body and the absorbent body overlap in the transverse direction when the absorbent article is viewed in the longitudinal direction in a region where the side seal is formed,

the back-side second elastic member is not arranged in the widthwise central region of the absorbent body, or is arranged so as not to exhibit stretchability when arranged in the central region,

one end of the back-side second elastic member is fixed at least by a back-side second fixing portion formed in the absorbent body in the side region adjacent to the central region.

3. A pant-type absorbent article according to claim 2, wherein:

4. A pant-type absorbent article according to claim 3, wherein:

5. A pant-type absorbent article according to any one of claims 2 to 4, wherein:

6. A pant-type absorbent article according to any one of claims 1 to 5, wherein:

7. A pant-type absorbent article according to any one of claims 2 to 6, wherein:

8. A pant-type absorbent article according to claim 7, wherein:

9. A pant-type absorbent article according to any one of claims 1 to 8, wherein:

the absorbent body has an auxiliary layer superposed on the absorbent sheet,

10. A pant-type absorbent article according to claim 9, wherein:

11. A pant-type absorbent article according to claim 10, wherein:

12. A pant-type absorbent article according to claim 10 or 11, wherein:

13. A pant-type absorbent article according to claim 11 or 12, wherein:

the lower end edge of the ventral-side outer body overlaps the widened portion.

14. A pant-type absorbent article according to any one of claims 9 to 13, wherein:

15. A pant-type absorbent article according to claim 14, wherein:

16. A pant-type absorbent article according to any one of claims 1 to 15, wherein:

after applying 4.9mN/cm ² (＝0.5gf/cm ² ) The thickness of the absorbent sheet measured under the pressure of (2) is 0.3mm to 5 mm.