CN113855395A

CN113855395A - Underpants type sanitary napkin

Info

Publication number: CN113855395A
Application number: CN202010620335.9A
Authority: CN
Inventors: 高桥雄二; 史异; 唐并男
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-12-31
Also published as: TWI879973B; WO2022004162A1; KR20230029697A; TW202216097A; JPWO2022004162A1

Abstract

The present invention provides a pant-type sanitary napkin with high fit at both sides in the excretory opening and the left-right direction. An underpants-type sanitary napkin (1) comprising an absorptive main body (10) provided with an absorptive core (11) and a waist member (20), wherein the absorbent core (11) is located along a non-skin side along the A plurality of elastic members (50) extending and contracting in the vertical direction are provided at predetermined intervals in the left-right direction, and the elastic members (50) have first elastic members (51) arranged on the outermost side respectively on both sides in the left-right direction and a second elastic member (52) disposed inside the first elastic member (51) adjacent to the first elastic member (51), the absorbent main body (10) at least in the left-right direction is positioned on the first elastic member (52). The region between 51) and the second elastic member (52) has a high-density portion (40) in which the density of the absorptive core (11) is higher than that of the surrounding portion.

Description

Underpants type sanitary napkin

Technical Field

The present invention relates to a pants-type sanitary napkin.

Background

Conventionally, absorbent articles such as disposable diapers and sanitary napkins having a liquid-absorbent main body have been known. In such an absorbent article, the fitting property of the absorbent body when worn can be improved by disposing the elastic member having stretchability along the longitudinal direction of the absorbent body. For example, patent document 1 discloses a technique in which a plurality of crotch elastic members 17 are arranged along the longitudinal direction of an absorbent main body 3, and the absorbent main body 3 is lifted upward (toward the skin of the wearer) by the contraction force of the crotch elastic members 17, thereby improving the fit of the crotch of the wearer.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2004-350809

Disclosure of Invention

Problems to be solved by the invention

In the absorbent article of patent document 1, the absorbent body can be brought into close contact with the crotch portion (excretory opening such as vagina) of the wearer in the region where the elastic member (crotch elastic member 17) is arranged, but the absorbent body is less likely to come into close contact with the skin of the wearer in the portion where the elastic member is not arranged on both sides in the left-right direction of the absorbent article. Therefore, excretory fluid such as menstrual blood having a high viscosity may leak (cause side leakage) to the lateral side of the absorbent main body along the skin (for example, both legs) of the wearer.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a pants-type sanitary napkin having high fit properties to both the excretory opening and the left-right direction.

Means for solving the problems

A main invention for achieving the above object is a pants-type sanitary napkin having a vertical direction, a horizontal direction, and a front-rear direction intersecting with each other, the pants-type sanitary napkin comprising: an absorbent body having an absorbent core that absorbs liquid; and a waist member disposed on a non-skin side of the absorbent body in an overlapping manner, wherein a plurality of elastic members that expand and contract in the vertical direction are provided at predetermined intervals in the horizontal direction at a position on the non-skin side of the absorbent core of the absorbent body, the elastic members each have a 1 st elastic member disposed on an outermost side and a 2 nd elastic member disposed inside the 1 st elastic member adjacent to the 1 st elastic member on both sides in the horizontal direction, and the absorbent body has a high-density portion in which a density of the absorbent core is higher than a density of a surrounding portion at least in a region between the 1 st elastic member and the 2 nd elastic member in the horizontal direction.

Other features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a pants-type sanitary napkin having high conformability to the excretory opening and both sides in the left-right direction can be provided.

Drawings

Fig. 1 is a schematic perspective view of a sanitary napkin 1.

Fig. 2 is a plan view of the sanitary napkin 1 in an unfolded and stretched state as viewed from the skin side in the thickness direction.

Fig. 3 is a schematic sectional view a-a of fig. 2.

Fig. 4 is a plan view and a sectional view of the absorbent main body 10.

Fig. 5A is a diagram illustrating the fit when a conventional sanitary napkin is worn as a comparative example. Fig. 5B is a view for explaining the fit when the sanitary napkin 1 of the present embodiment is worn.

Fig. 6A to 6C are views illustrating the sheet joining portion 60 joining the non-skin side sheet 21 and the

skin side sheets

22 and 23 of the waistline member 20.

Fig. 7 is a view illustrating a bottom joining portion 70 joining the chassis 14 and the side sheet 15 in the absorbent main body 10.

Fig. 8 is a view illustrating the body coupling portion 80 for mounting and coupling the absorbent body 10 to the lumbar member 20.

Description of the reference numerals

1: sanitary napkin (pants-type sanitary napkin, absorbent article), 1 a: waistline opening, 1 b: leg hole opening, 10: absorbent main body, 11: absorbent core, 12: topsheet, 13: second sheet, 14: backsheet, 15: side sheet, 15 t: end portion, 20: waistline member, 20 f: front waist member, 20 fe: end, 20 b: rear side waist member, 20 be: end, 20 we: side joint, 21: non-skin side sheet, 22: skin side sheet, 23: skin side sheet, 25: waist elastic member, 30: leakage preventing wall portion, 31: leakage preventing wall elastic member, 32 f: front-side joining portion, 32 b: rear-side joining portion, 40: high density portion, 41: 1 st high density portion, 42: 2 nd high density portion, 42r 1: reversal, 42r 2: reverse portion, 43: 3 rd high density portion, 43 c: rear side projection, 50: absorber elastic member, 51: 1 st elastic member, 52: 2 nd elastic member, 53: 3 rd elastic member, 60: sheet joining portion, 61: 1 st piece joining portion, 62: 2 nd sheet joining portion, 70: bottom joint, 80: body joint, 100: absorbent body (comparative example), CL: central position (diagonal).

Detailed Description

At least the following matters will be apparent from the description of the present specification and the accompanying drawings.

A pants-type sanitary napkin having a vertical direction, a horizontal direction, and a front-rear direction intersecting each other, comprising: an absorbent body having an absorbent core that absorbs liquid; and a waist member disposed on a non-skin side of the absorbent body in an overlapping manner, wherein a plurality of elastic members that expand and contract in the vertical direction are provided at predetermined intervals in the horizontal direction at a position on the non-skin side of the absorbent core of the absorbent body, the elastic members each have a 1 st elastic member disposed on an outermost side and a 2 nd elastic member disposed inside the 1 st elastic member adjacent to the 1 st elastic member on both sides in the horizontal direction, and the absorbent body has a high-density portion in which a density of the absorbent core is higher than a density of a surrounding portion at least in a region between the 1 st elastic member and the 2 nd elastic member in the horizontal direction.

According to such a pants-type sanitary napkin, the central portion in the left-right direction where the second elastic member 2 is disposed and the both side portions in the left-right direction where the first elastic member 1 is disposed in the absorbent core are respectively lifted up toward the crotch of the wearer with the high-density portion as a bending origin, and are brought into close contact with the skin of the wearer. Therefore, in the crotch portion of the wearer, the fit of the absorbent body is improved at the excretory opening (vaginal opening) in the center portion in the left-right direction and the groin portions on both sides in the left-right direction, and it is possible to make it difficult for excretory fluid such as menstrual blood to leak.

Further, it is apparent that a pants-type sanitary napkin having a vertical direction, a horizontal direction, and a front-rear direction intersecting each other, comprising: an absorbent body having an absorbent core that absorbs liquid; and a waist member disposed so as to overlap the non-skin side of the absorbent main body, a plurality of elastic members that stretch and contract in the vertical direction are provided at positions on the non-skin side of the absorbent core of the absorbent main body at predetermined intervals in the horizontal direction, the elastic member has a 1 st elastic member disposed on an outermost side and a 2 nd elastic member disposed adjacent to the 1 st elastic member and inside the 1 st elastic member on both sides in the left-right direction, the absorbent main body has high-density portions at both sides in the left-right direction, the density of the absorbent core being higher than the density of the surrounding portions, the region of the absorbent main body in which the 1 st elastic member is disposed and the region of the absorbent main body in which the 2 nd elastic member is disposed each have a shape that is convex toward the skin of the wearer when viewed in the front-rear direction.

According to such a pants-type sanitary napkin, the central portion in the left-right direction where the second elastic member 2 is disposed and the both side portions in the left-right direction where the first elastic member 1 is disposed in the absorbent core are each deformed so as to project upward so as to be raised toward the crotch of the wearer. Therefore, in the crotch portion of the wearer, the fit of the absorbent body is improved at the excretory opening (vaginal opening) in the center portion in the left-right direction and the groin portions on both sides in the left-right direction, and it is possible to make it difficult for excretory fluid such as menstrual blood to leak.

In the pants-type sanitary napkin, it is preferable that the pants-type sanitary napkin has a fold-in-line when the pants-type sanitary napkin is folded in two in the front-rear direction, and a length of a portion on a rear side of the fold-in-line on which the contraction force by the elastic member acts is longer than a length of a portion on a front side of the fold-in-line on which the contraction force by the elastic member acts.

According to such a pants-type sanitary napkin, the magnitude of the contraction force acting on the rear side (back side) of the fold line is larger than the contraction force acting on the front side (stomach side), and the absorbent main body is more easily attached to the back side (hip side) of the wearer. This effectively prevents menstrual blood or the like excreted from the excretory opening from moving obliquely rearward along the wearer's buttocks and leaking to the outside of the pants-type sanitary napkin.

In the pants-type sanitary napkin, it is preferable that a pair of leakage preventing wall portions having leakage preventing wall elastic members which expand and contract in the vertical direction are provided on both side portions in the horizontal direction of the absorbent main body, and a length of a portion on which a contraction force by the elastic members acts is longer than a length of a portion on which a contraction force by the leakage preventing wall elastic members acts, at least at a position on a rear side of the folding line.

According to such a pants-type sanitary napkin, since the elastic member acting on the back side (hip side) of the wearer has a higher contraction force than the leakage preventing wall elastic member, the absorbent core can be easily brought into close contact with the skin of the wearer, and the leakage preventing wall portion can be prevented from rising excessively to the skin side of the wearer. Therefore, when the underpants type sanitary napkin is worn, it is possible to suppress formation of a gap (space) between the buttocks of the wearer and the absorbent core, and to make it difficult for the excretory fluid to leak.

In the pants-type sanitary napkin, it is preferable that the high-density portion has a rear-side protrusion extending from the outer side toward the inner side in the left-right direction and from the lower side toward the upper side in the up-down direction at an upper end portion on the rear side of the folding line, and the 1 st elastic member is located on the outer side of an outer end of the rear-side protrusion in the left-right direction.

According to such a pants-type sanitary napkin, the three-dimensional deformation of the absorbent core is easily suppressed at the portion where the rear side projection extending obliquely is provided. In addition, the both side portions of the rear side portion are stretched by the 1 st elastic member, so that the absorbent core can be brought into contact with the vicinity of the sacral portion (buttocks) of the wearer while the rear side end region of the absorbent core is kept in a flat shape.

In the above-described underpants type sanitary napkin, it is preferable that the waist member has at least a skin side sheet and a non-skin side sheet laminated on the non-skin side of the skin side sheet, and the underpants type sanitary napkin has a sheet joining portion joining the skin side sheet and the non-skin side sheet, and in a region where the absorbent main body and the waist member overlap each other when viewed in the thickness direction, the total area of the sheet joining portions formed per unit area in a region on the inner side in the left-right direction than the high density portion is smaller than the total area of the sheet joining portions formed per unit area in a region on the outer side in the left-right direction than the high density portion.

According to such a pants-type sanitary napkin, by increasing the area ratio of the joint portion in the region on the left and right outer sides of the pair of high-density portions, the extension/contraction stress can be reduced, and the width in the left and right direction of the absorbent main body can be easily ensured. On the other hand, by reducing the area ratio of the joined portions in the regions on the left and right inner sides of the high-density portion, the stretching force of the waist member can be effectively utilized, and the absorbent main body can be easily fitted to the gluteal groove of the wearer. Thus, even when the wearer moves his or her legs, the sanitary napkin can be easily kept in good fit, and leakage of menstrual blood through the skin can be suppressed.

In the pants-type sanitary napkin, it is preferable that the total area of the sheet joint portions formed per unit area in the region where the absorbent main body overlaps the waist member and the region located inward in the left-right direction with respect to the high-density portion when viewed in the thickness direction is smaller than the total area of the sheet joint portions formed per unit area in the region located forward of the fold line when the pants-type sanitary napkin is folded in two in the front-rear direction.

According to such a pants-type sanitary napkin, the rigidity of the front side of the waist member is improved as compared with the rear side when worn. Thus, even if the wearer performs a turn-over or the like while using the absorbent article in a lying position at night, the absorbent main body can easily maintain the shape once deformed at the front side (ventral side). On the other hand, by reducing the rigidity on the back side (back side) of the waistline member, the expansion and contraction in the longitudinal direction (up-down direction) of the absorbent-body elastic member is less likely to be hindered, and therefore the absorbent main body is likely to follow the gluteal cleft. In addition, the lumbar member is easily contracted in the right and left direction, and thus the fit to the hip is easily maintained even when the wearer turns over.

In the pants-type sanitary napkin, it is preferable that the absorbent main body has a liquid-impermeable back sheet disposed on the non-skin side of the absorbent core and a side sheet laminated on the non-skin side of the back sheet, the pants-type sanitary napkin has a bottom joint portion joining the back sheet and the side sheet, the pants-type sanitary napkin has a 3 rd elastic member disposed inside the 2 nd elastic member adjacent to the 2 nd elastic member in the left-right direction, and a total area of the bottom joint portions per unit area formed in a region between the 1 st elastic member and the 2 nd elastic member is larger than a total area of the bottom joint portions per unit area formed in a region between the 2 nd elastic member and the 3 rd elastic member in the left-right direction.

According to such a pants-type sanitary napkin, in the region between the 1 st elastic member and the 2 nd elastic member, the joining strength between the chassis and the side sheet is improved, and the rigidity of the absorbent main body can be improved. Therefore, in this region, the absorbent body (absorbent core) tends to be bent habitually, and when the absorbent core is deformed by projection, the shape is easily maintained. This makes it easy to maintain the state in which the absorbent body is attached to the crotch portion of the wearer, improves the absorbency of menstrual blood and the like, and makes it easy to suppress leakage.

In this pants-type sanitary napkin, it is preferable that the waist member has a front waist member and a rear waist member, and has side joint portions at both ends in the left-right direction for joining the front waist member and the rear waist member to each other, and that the lower ends of the side joint portions are located higher than the upper ends of the first elastic members at positions on the front side of a fold line when the pants-type sanitary napkin is folded in two in the front-rear direction.

According to such a pants-type sanitary napkin, even if the front waist member deforms in accordance with the movement of the wearer's body (abdominal side) when worn, the influence of the deformation is less likely to propagate to the absorbent elastic member. Therefore, the absorbent body is prevented from being positionally displaced in conjunction with the operation of the front waist member, and the good fit of the absorbent body can be easily maintained.

In the pants-type sanitary napkin, it is preferable that the pants-type sanitary napkin has a main body joint portion for joining the absorbent main body to the skin side of the waist portion, and the interval between the pair of 1 st elastic members is larger than 1/2 which is the width of the absorbent core and smaller than the width of the main body joint portion in the left-right direction.

According to such a pants-type sanitary napkin, the interval between the 1 st elastic members is made smaller than the width of the main body joining portion, so that the elastic force generated by the 1 st elastic member is less likely to act on the rising starting point of the leakage preventing wall portion (the outer end of the main body joining portion), and the rising of the leakage preventing wall portion is less likely to be hindered. Further, by making the interval of the 1 st elastic member larger than 1/2 the width of the absorbent core, it is possible to suppress a situation in which the area of the central portion in the left-right direction of the absorbent core is too narrow to cause a convex deformation and to make it difficult to attach the absorbent core to the excretory opening.

As this pants-type sanitary napkin, it is desirable that the width at the upper end portion in the up-down direction of the main body joint portion is larger than the width at the lower end portion in the up-down direction of the main body joint portion.

According to such a pants-type sanitary napkin, the absorbent main body is joined to the waist member over a large area at the upper end portion in the vertical direction, the absorbent main body is less likely to be twisted or deformed, and the absorbent main body is likely to fit the body of the wearer over a large area. On the other hand, at the lower end portion (crotch portion) in the vertical direction, the portion where the absorbent main body is joined to the waist member is narrow, so that the absorbent main body is easily deformed, and the occurrence of discomfort or the like due to the both side edges of the absorbent main body being pressed against the wearer's groin can be suppressed.

As this pants-type sanitary napkin, it is desirable that the pants-type sanitary napkin has a fold-in-line when the pants-type sanitary napkin is folded in two in the front-rear direction, and does not have a portion where the high-density portion overlaps the fold-in-line.

According to such a pants-type sanitary napkin, since the high-density portions are discontinuous across the fold-line, the absorbent main body is likely to be deformed independently in each region on the front and back sides when the pants-type sanitary napkin is worn. That is, the front side and the back side of the absorbent main body can easily follow the movement of the wearer's body, and the fit can be further improved. This makes it possible to easily suppress leakage of menstrual blood and the like.

In the pants-type sanitary napkin, it is preferable that the high-density portion has a reverse portion in which a partial region is reversed to the opposite side in the vertical direction, and the reverse portion has a portion intersecting with the 1 st elastic member.

According to such a pants-type sanitary napkin, in the portion where the inversion portion intersects with the 1 st elastic member, the contraction force generated by the 1 st elastic member is less likely to act on the absorbent core under the influence of the inversion portion. Therefore, by adjusting the arrangement of the inversion sections, the deformation of the absorbent core can be locally controlled. This makes it possible to easily fit the absorbent core along the wearer's body.

Embodiments of the present invention are described in detail below with reference to the accompanying drawings

An underpants type sanitary napkin 1 (hereinafter, also simply referred to as "sanitary napkin 1") will be described as an example of the absorbent article according to the embodiment of the present invention.

< basic constitution of sanitary napkin 1>

Fig. 1 is a schematic perspective view of a sanitary napkin 1 according to the present embodiment. Fig. 2 is a plan view of the sanitary napkin 1 in an unfolded and stretched state as viewed from the skin side in the thickness direction. Fig. 3 is a schematic sectional view a-a of fig. 2.

The "stretched state" of the sanitary napkin 1 means a state in which the entire sanitary napkin 1 (the entire product) is stretched without wrinkles by stretching each elastic member (for example, the absorbent elastic member 50, the

skin side sheets

22 and 23, and the like, which will be described later) provided in the sanitary napkin 1, and specifically, a state in which the dimension of each member (for example, the non-skin side sheet 21 and the

skin side sheets

22 and 23, which will be described later) constituting the sanitary napkin 1 is equal to or close to the dimension of the member alone.

As shown in fig. 1, the sanitary napkin 1 has a "vertical direction", a "horizontal direction", and a "front-rear direction" that are orthogonal to each other. As shown in fig. 3, the direction in which the respective members are stacked, i.e., the "thickness direction" is provided. In the vertical direction, the side that becomes the torso side of the wearer when the wearer wears the sanitary napkin 1 is referred to as the "upper side", and the side that becomes the crotch side of the wearer is referred to as the "lower side". In the front-back direction, the side that becomes the abdomen side of the wearer when worn is referred to as the "front side", and the side that becomes the back side of the wearer is referred to as the "back side". In addition, the side in the thickness direction that comes into contact with the skin of the wearer with the sanitary napkin 1 worn by the wearer is referred to as the "skin side", and the opposite side is referred to as the "non-skin side".

In addition, the sanitary napkin 1 has a "longitudinal direction" and a "transverse direction" which are orthogonal to each other in the developed state shown in fig. 2. The "longitudinal direction" is a direction along the vertical direction of the pants type, and the "transverse direction" is a direction along the horizontal direction of the pants type.

The sanitary napkin 1 of the present embodiment includes: a liquid-absorbent main body 10 for absorbing liquid such as menstrual blood; and a waistline member 20 disposed on the non-skin side of the absorbent main body 10 and disposed on the waistline of the wearer when the sanitary napkin 1 is worn.

(absorbent body 10)

Fig. 4 is a plan view and a sectional view of the absorbent main body 10. As shown in fig. 2, the absorbent main body 10 of the present embodiment is substantially rectangular in plan view with its longitudinal direction (i.e., the longitudinal direction of the absorbent main body 10) along the vertical direction of the sanitary napkin 1. As shown in fig. 3 and 4, the absorbent main body 10 includes an absorbent core 11 extending in the longitudinal direction (vertical direction), a top sheet 12 disposed on the skin side of the absorbent core 11, a second sheet 13 disposed between the top sheet 12 and the absorbent core 11, a back sheet 14 disposed on the non-skin side of the absorbent core 11, and a side sheet 15 disposed on the non-skin side of the back sheet 14.

The absorbent core 11 is a member for absorbing and retaining liquid such as urine, and is formed of liquid absorbent fibers such as pulp fibers mixed with a Super Absorbent Polymer (SAP), for example. The absorbent core 11 may be covered with a liquid-permeable sheet member (core wrap sheet) such as tissue paper or nonwoven fabric.

The top sheet 12 is a liquid-permeable sheet member that can be brought into contact with the skin of the wearer when worn, and is formed of, for example, a hydrophilic air-through nonwoven fabric, a spunbond nonwoven fabric, or the like. In the present embodiment, as shown in the cross-sectional view of fig. 4, both side end portions in the left-right direction of the top sheet 12 are folded back from the skin side to the non-skin side in the thickness direction on both outer sides in the left-right direction of the absorbent core 11, and are configured to be sandwiched between the absorbent core 11 and the back sheet 14.

The second sheet 13 is a sheet member having substantially the same function and structure as the top sheet 12, and is laminated on the non-skin side surface of the top sheet 12. In addition, the second sheet 13 may not be necessarily provided in the absorbent main body 10.

The back sheet 14 is an air-permeable and liquid-impermeable sheet member for suppressing leakage of liquid such as menstrual blood absorbed by the absorbent core 11 to the outside, and is formed of, for example, a resin film or the like.

The side sheet 15 is a sheet member laminated on the non-skin side of the back sheet 14, and for example, a nonwoven fabric having flexibility such as a through-air nonwoven fabric is used. In the present embodiment, the side sheet 15 forms a pair of leakage preventing

wall portions

30 and 30.

The pair of leakage preventing walls 30 is provided on both sides of the absorbent main body 10 in the left-right direction, and corresponds to so-called three-dimensional gathers. When the sanitary napkin 1 is worn, the leakage preventing wall portions 30 rise from both sides of the absorbent main body 10 in the left-right direction toward the skin of the wearer, thereby suppressing leakage of excretory fluid such as menstrual blood to the outside of the absorbent main body 10.

In the present embodiment, as shown in the cross-sectional view of fig. 4, the side sheets 15 extend outward in both lateral directions (transverse directions) of the absorbent core 11, are bent toward the skin side in the thickness direction at both ends in the lateral direction of the absorbent main body 10, and the end portions 15t are disposed on the skin side of the absorbent core 11. The front (ventral) end of the end portion 15t in the longitudinal direction is joined to the skin-side surface of the top sheet 12 by a front joining portion 32f, and the rear (dorsal) end in the longitudinal direction is joined to the skin-side surface of the top sheet 12 by a rear joining portion 32b (see fig. 4). The front side joining portion 32f and the rear side joining portion 32b are formed using a joining material such as a hot melt adhesive, for example.

As shown in fig. 4, the end portion 15t is in a state of being laminated in the thickness direction by folding back the side sheet 15, and a leakage preventing wall elastic member 31 is provided between the

laminated side sheets

15, 15. The leakage preventing wall elastic member 31 is provided in a state of being elongated in the longitudinal direction (up-down direction), and is fixed by the front side joining portion 32f and the rear side joining portion 32b at both end portions in the longitudinal direction, thereby exhibiting stretchability in the longitudinal direction (up-down direction) between the front side joining portion 32f and the rear side joining portion 32 b. When the sanitary napkin 1 is worn, the end portions 15t of the leakage preventing wall portions 30 contract in the longitudinal direction (vertical direction) based on the stretchability exhibited by the leakage preventing wall elastic members 31, and the free end sides of the end portions 15t stand up toward the skin of the wearer. The expansion ratio of the leakage preventing wall elastic member 31 provided in the leakage preventing wall portion 30 is preferably about 2.2 to 2.6 times. The extension ratio is represented by the value obtained by dividing the length of the elastic member (the leakage preventing wall elastic member 31) in the extended state by the length of the elastic member (the leakage preventing wall elastic member 31) in the natural state.

The absorbent body 10 is provided with a high-density portion 40 in which the density of the absorbent core 11 is higher than that of the surrounding portion. The high-density portion 40 is formed by compressing each member constituting the absorbent main body 10 in the thickness direction. As shown in fig. 4, the high-density portion 40 of the present embodiment includes a 1 st high-density portion 41, a 2 nd high-density portion 42, and a 3 rd high-density portion 43, which are formed in a linear shape by arranging a plurality of dot-shaped compressed portions. By providing such a high-density portion 40, the liquid-absorbent fibers of the absorbent core 11 are prevented from being scattered and being deformed. Further, when the sanitary napkin 1 is worn, the high-density portions 40 serve as bending starting points, and the absorbent core 11 is easily deformed three-dimensionally in accordance with the shape of the wearer's body, and is easily attached to the wearer's body.

Further, the absorbent main body 10 is provided with a plurality of absorbent elastic members 50 that expand and contract in the longitudinal direction (vertical direction). The absorbent elastic member 50 is formed of, for example, a rubber band, and is disposed at a position on the non-skin side of the absorbent core 11 (specifically, between the chassis 14 and the side sheet 15) in a state of being extended in the longitudinal direction (vertical direction). In the sanitary napkin 1 of the present embodiment, as shown in fig. 4, 5 absorbent elastic members 50 are provided at predetermined intervals in the left-right direction. The elongation ratio of the absorber elastic member 50 is preferably about 2.7 to 3.2 times. By setting the extension magnification of the absorber elastic members 50 to a magnification higher than that of the leakage barrier elastic members 31, the absorbent main body 10 is likely to contract from the non-skin side in the thickness direction, and the absorbent main body 10 can be easily attached to the body of the wearer when the sanitary napkin 1 is worn. That is, the absorbent main body 10 is likely to be in close contact with the wearer's crotch by the stretchability exhibited by the absorbent elastic member 50, and leakage of excretory fluid such as menstrual blood can be made difficult.

Hereinafter, the 1 st

elastic members

51, 51 are used as the absorber elastic members 50 disposed outermost on both sides in the left-right direction. The absorber elastic members 50 disposed adjacent to the 1 st

elastic members

51, 51 on the inner side in the left-right direction of the 1 st

elastic members

51, 51 are referred to as the 2 nd

elastic members

52, 52. Further, the absorber elastic member 50 disposed at the inner side in the left-right direction than the 2 nd elastic member 52 is referred to as a 3 rd elastic member 53. The absorber elastic member 50 may include at least a pair of the 1 st

elastic members

51, 51 and a pair of the 2 nd

elastic members

52, 52. That is, the number of the 3 rd elastic members 53 may be 2 or more, or may be zero.

(waist member 20)

The waistline member 20 is configured by a plurality of sheet members, and in the present embodiment, includes a non-skin side sheet 21 and skin side sheets 22 and 23 (see fig. 3). In the following description, a portion of the hip member 20 located forward (ventral) relative to the center position CL in the longitudinal direction is also referred to as a front hip member 20f, and a portion located rearward (dorsal) relative to the center position CL is also referred to as a rear hip member 20 b.

The non-skin side sheet 21 is a non-stretchable sheet member disposed on the most non-skin side of the sanitary napkin 1, and is formed of, for example, a spunbond nonwoven fabric, an SMS nonwoven fabric, or the like. In the present embodiment, as shown in a plan view in fig. 2, the center portion (portion including the center position CL) of the non-skin side sheet 21 in the longitudinal direction has a shape that is constricted inward in the left-right direction.

The skin side sheet 22 is a stretchable sheet member laminated on the skin side of the non-skin side sheet 21 on the front side (ventral side) in the longitudinal direction. The skin side sheet 22 is formed of, for example, an elastic nonwoven fabric. The term "stretch nonwoven fabric" refers to a nonwoven fabric comprising stretchable fibers having stretchability and extensible fibers having lower contractility than the stretchable fibers, and subjected to an appropriate stretching treatment such as gear stretching. The skin side sheet 22 of the present embodiment can use, as the stretchable fiber, a fiber of a polyurethane elastomer, which is one type of thermoplastic elastomer having elasticity, and can use, as the extensible fiber, a fiber of polypropylene (PP), which is a polyolefin resin, which is one type of thermoplastic resin having inelasticity.

The skin side sheet 22 is joined to the non-skin side sheet 21 by a plurality of scattered sheet joining portions 60 (see fig. 6), thereby providing stretchability at least in the left-right direction to the front waist member 20 f. In the present embodiment, the sheet joining portion 60 is formed by a known joining means such as ultrasonic welding.

The skin side sheet 23 is a stretchable sheet member in which the back side (back side) in the longitudinal direction is laminated on the skin side of the non-skin side sheet 21. The skin side sheet 23 has the same structure as the skin side sheet 22. That is, the skin-side sheet 23 is formed of a stretchable nonwoven fabric, and is joined to the non-skin-side sheet 21 by a plurality of sheet joining portions 60 (see fig. 6) that are scattered. This imparts stretchability in at least the left-right direction to the rear waist member 20 b.

The sanitary napkin 1 is folded in half the absorbent main body 10 and the waistline member 20 in the longitudinal direction (front-back direction) from the unfolded state shown in fig. 2 with the center position CL (shown by a one-dot chain line in fig. 2) in the longitudinal direction of the absorbent main body 10 as a folded position. In this folded state, the both lateral (left-right) end portions 20fe, 20fe of the front waist member 20f and the both lateral (left-right) end portions 20be, 20be of the rear waist member 20b, which are overlapped in the front-rear direction, are joined by a known joining means such as seal welding to form the side joint portions 20 we. Thus, the waistline members 20(20f and 20b) folded in two are connected in a ring shape on the front side (ventral side) and the rear side (dorsal side), and 1 waistline opening 1a and a pair of leg hole openings 1b as shown in fig. 1 are formed, thereby forming the underpants type sanitary napkin 1.

< Fit Property of sanitary napkin 1>

Next, the fitting property when the sanitary napkin 1 is worn will be described. Fig. 5A is a diagram illustrating the fit when a conventional sanitary napkin is worn as a comparative example. Fig. 5B is a view for explaining the fit when the sanitary napkin 1 of the present embodiment is worn.

The sanitary napkin of the comparative example shown in fig. 5A is provided with an absorbent main body 100. The absorbent main body 100 of the comparative example has substantially the same structure as the absorbent main body 10 of the present embodiment, but the absorbent body elastic member 50 has a different structure from the absorbent main body 10. That is, in the absorbent main body 100 of the comparative example, 3 absorbent elastic members 50 are provided in the region between the pair of high-

density portions

40, 40 in the left-right direction, and an elastic member corresponding to the 1 st elastic member 51 of the present embodiment is not provided in the region outside the high-

density portions

40, 40. In other words, in the absorbent body 100 of the comparative example, the absorber elastic members 50 are provided in the center region in the left-right direction, but the absorber elastic members 50 are not provided in the regions on both sides in the left-right direction. In addition, the high density portion 40 may not be provided in the absorbent body 100.

When a sanitary napkin including the absorbent main body 100 of the comparative example is worn, the absorbent core 11 is lifted toward the skin of the wearer by contraction of the absorbent elastic members 50 in the region (central portion in the left-right direction) of the absorbent main body 100 that is more inward in the left-right direction than the pair of high-

density portions

40, 40. That is, as shown in fig. 5A, the central portion in the lateral direction of the absorbent core 11 is deformed to be convex toward the skin of the wearer and is brought into close contact with the excretory opening such as the vaginal opening. Therefore, menstrual blood and the like can be efficiently absorbed in the crotch portion.

On the other hand, in the absorbent main body 100 of the comparative example, the absorbent elastic members 50 are not provided in the regions outside the pair of high-

density portions

40 and 40 in the left-right direction (both side portions in the left-right direction), and therefore, the contraction force by the absorbent elastic members 50 does not act on these regions, and the absorbent core 11 is less likely to fit the body of the wearer. That is, the absorbent core 11 is difficult to be brought into close contact with the regions on both sides of the excretory opening. Therefore, highly viscous liquids such as menstrual blood may leak laterally from the groin along the legs of the wearer.

In contrast, in the case of the sanitary napkin 1 of the present embodiment, the region (the central portion in the left-right direction) inside the pair of high-

density portions

40, 40 in the absorbent main body 10 in the left-right direction is easily attached to the vaginal opening of the wearer, as in the comparative example. That is, the 2 nd elastic member 52 (and the 3 rd elastic member 53) contracts and, as seen from the front side in the front-rear direction as shown in fig. 5B, the central portion in the left-right direction of the absorbent core 11 is bent so as to be raised toward the skin side of the wearer. That is, the region where the 2 nd elastic member 52 is provided is deformed so as to be convex toward the skin side, and is likely to be in close contact with the excretory opening such as the vaginal opening.

In addition, in the regions (both side portions in the left-right direction) on the outer side in the left-right direction than the pair of high-density portions 40, the 1 st

elastic members

51, 51 contract, whereby both side portions in the left-right direction of the absorbent core 1 are bent so as to be raised toward the skin side of the wearer. That is, the region where the 1 st

elastic member

51, 51 is provided is deformed so as to have a convex shape toward the skin side, and is easily attached to the vicinity of the inguinal portion of the wearer. Therefore, even if excretory fluid such as menstrual blood flows laterally along the legs of the wearer, the excretory fluid is reliably absorbed by the absorbent core 11 at the groin portions, and therefore, side leakage can be made less likely to occur.

In the absorbent main body 10 of the present embodiment, the high-density portion 40 is disposed between the 1 st elastic member 51 and the 2 nd elastic member 52 in the left-right direction. Therefore, when the absorber elastic members 50(51, 52) contract, the high-density portions 40 become bending starting points, and the absorbent core 11 is likely to be deformed three-dimensionally. That is, the region on the left-right inner side of the high-density portion 40 is likely to be deformed to bulge toward the excretory opening of the wearer by contraction of the 2 nd elastic member 52, and the region on the left-right outer side of the high-density portion 40 is likely to be deformed to bulge toward the groin portion of the wearer by contraction of the 1 st elastic member 51 (see fig. 5B).

In this manner, in the sanitary napkin 1, the left-right direction central portion where the 2 nd elastic member 52 is disposed and the left-right direction both side portions where the 1 st elastic member 51 is disposed are respectively lifted up toward the crotch of the wearer with the high-density portion 40 as a bending start point, and are brought into close contact with the skin of the wearer. Therefore, the fit of the excretory opening (vaginal opening) to the center portion in the left-right direction and the fit of the inguinal portion to the both side portions in the left-right direction are improved in the crotch portion of the wearer, and it is possible to make it difficult for excretory fluid such as menstrual blood to leak.

As shown in fig. 4, in the longitudinal direction of the sanitary napkin 1 (absorbent main body 10), the length Lb50 of the portion in which the contraction force generated by the absorber elastic member 50 acts on the region on the rear side of the center position CL is longer than the length Lf50 of the portion in which the contraction force generated by the absorber elastic member 50 acts on the region on the front side of the center position CL (Lb50> Lf 50). That is, the magnitude of the contraction force acting on the position closer to the rear side (back side) than the fold line (center position CL in the longitudinal direction) when the sanitary napkin 1 is folded back and forth is larger than the magnitude of the contraction force acting on the position closer to the front side (stomach side) than the fold line (center position CL). Therefore, when the sanitary napkin 1 is worn, the absorbent main body 10 is more likely to fit on the back side (hip side) of the wearer. Thus, for example, when the wearer sits or lies on his back, it is possible to effectively prevent menstrual blood or the like discharged from the excretory opening from moving diagonally rearward along the buttocks of the wearer and leaking to the outside of the sanitary napkin 1.

Further, at a position on the longitudinal rear side of the center position CL, the length Lb50 of the portion on which the contraction force by the absorber elastic member 50 acts is longer than the length Lb31 of the portion on which the contraction force by the leakage preventing wall elastic member 31 acts (Lb50> Lb 31). As described above, when the sanitary napkin 1 is worn, the leakage preventing wall portions 30 are raised toward the wearer's body by the stretchability exhibited by the leakage preventing wall elastic members 31, and side leakage of the excretory fluid is easily suppressed. However, if the rising height of the leakage preventing wall portions 30 is too high, a gap is formed between the absorbent core 11 and the skin of the wearer, and the absorption of the discharged liquid into the absorbent core 11 may be difficult.

In contrast, in the present embodiment, by setting Lb50> Lb31, the contraction force acting on the absorber elastic member 50 on the hip portion side is increased. This makes it easy to bring the absorbent core 11 into close contact with the skin of the wearer, and prevents the leakage preventing wall portions 30 from rising too high toward the skin of the wearer. Therefore, when the sanitary napkin 1 is worn, the formation of a gap (space) between the buttocks of the wearer and the absorbent core 11 is suppressed, and the absorption of the excreted liquid can be further improved. In the sanitary napkin 1 of the present embodiment, as described above, the extension ratio of the absorber elastic member 50 is set to be larger than the extension ratio of the leakage preventing wall elastic member 31, so that the contraction force of the absorber elastic member 50 becomes larger, and the gap (space) becomes more difficult to form.

Further, the high-density portion 40 (the 3 rd high-density portion 43) has a rear side protrusion 43c (see fig. 4) having a rear side end portion in a shape protruding rearward at a position rearward of the folding line (the center position CL). The rear side protrusion 43c is disposed so as to face inward from the outer side in the left-right direction and face upward from the lower side in the up-down direction at the upper end portion on the rear side (back side) with respect to the folding line when the sanitary napkin 1 is worn. In the region where the rear side projection 43c is disposed, the three-dimensional deformation of the absorbent core 11 as described above is easily suppressed by the rear side projection 43c extending obliquely, and the absorbent core 11 is easily brought into close contact with the body of the wearer while maintaining the planar shape. The region where the rear side protrusion 43c is disposed is a position along the sacrum of the wearer when the sanitary napkin 1 is worn, and therefore the absorbent core 11 can be fitted flat to the vicinity of the sacrum of the wearer.

Further, the 1 st

elastic members

51, 51 are disposed at positions further outward than the outer end of the rear side protrusion 43c in the left-right direction. Thus, the both side portions of the rear side protrusion 43c are stretched by the 1 st elastic member 51, and the both side portions of the absorbent core 11 can be attached to the buttocks of the wearer along both sides of the sacrum in a state where the rear side end region of the absorbent core 11 is kept in a planar shape. Therefore, leakage of menstrual blood or the like on the hip side can be more easily suppressed.

Fig. 6A to 6C are views illustrating the sheet joining part 60 joining the non-skin side sheet 21 and the

skin side sheets

22 and 23 of the waistline member 20. Fig. 6A illustrates the kind and arrangement of the panel joint portions 60 formed in the waistline member 20 in the unfolded and extended state. In the present embodiment, the non-skin side sheet 21 and the

skin side sheets

22 and 23 are joined to each other by the 2-sheet joining portion 60. Specifically, in the region B indicated by the hatched portion, the non-skin side sheet 21 and the

skin side sheets

22 and 23 are joined in a state of being stacked in the thickness direction by a plurality of 1 st sheet joining portions 61 shown in fig. 6B. In addition, in the regions other than the region B, i.e., the region C and the region D, of the waistline member 20, the non-skin side sheet 21 and the

skin side sheets

22 and 23 are joined in a state of being laminated in the thickness direction by a plurality of 2 nd sheet joining portions 62 shown in fig. 6C.

As described above, the respective sheet joining portions 60(61, 62) are formed by joining means such as ultrasonic welding. Such thin sheet joining portions 60 are scattered over the entire waistline member 20, so that the waistline member 20 can maintain good flexibility and stretchability, and can secure sufficient strength.

In the present embodiment, it is preferable that the total area of the 1 st joining parts 61 per unit area formed in the region B (area ratio of the 1 st joining part 61) is larger than the total area of the 2 nd joining parts 62 per unit area formed in the regions C and D (area ratio of the 2 nd joining part 62). That is, it is preferable that the waistline member 20 has higher rigidity in the region B than in the regions C and D.

When viewed in the thickness direction in a state where the absorbent main body 10 is mounted on the waistline member 20 in an overlapping manner, the region C shown in fig. 6A is located inward in the left-right direction from the pair of high-

density portions

40, 40. This region is a region where the absorbent core 11 is convexly deformed toward the skin of the wearer as described in fig. 5B. Therefore, the waist member 20 has lower rigidity in the region C than in the region B, and the stretchability of the waist member 20 is less likely to be inhibited in this region, and the absorbent main body 10 can be easily maintained in a state of being fitted to the crotch of the wearer when the sanitary napkin 1 is worn. On the other hand, in the region B located on the outer side in the left-right direction than the pair of high-density portions 40, the rigidity tends to be higher than that of the region C. Therefore, the rigidity of the absorbent main body 10 is easily maintained as the entire region B, and when the sanitary napkin 1 is worn, the absorbent main body 10 is suppressed from being compressed in the left-right direction (so-called, the occurrence of the neck-in) and the adhesiveness is suppressed from deteriorating. Further, since the region C has low rigidity and is more easily stretchable than the region B, the absorbent main body 10 can be easily kept in a state of being fitted to the gluteal groove even if the body moves due to turning over or the like. This can prevent menstrual blood from passing through the skin and leaking out of the buttocks.

In addition, in the sanitary napkin 1, the region C is provided in the vicinity of the rear side in the longitudinal direction. In other words, the area of the portion of the region C located rearward of the center position CL in the longitudinal direction is larger than the area of the portion of the region C located forward of the center position CL (see fig. 6A). That is, the rear side (back side) of the lumbar member 20 in the longitudinal direction has lower rigidity than the front side (stomach side). Thus, the rear (back) side region of the waistline member 20 is easily deformed when the sanitary napkin 1 is worn. With this configuration, when the wearer is used in a lying position at night, the front side can easily maintain the once-deformed shape even if the wearer performs an action such as turning over. Further, the rigidity of the rear side is lowered, so that it is difficult to hinder the expansion and contraction in the longitudinal direction (up-down direction) of the absorber elastic member 50, and therefore the absorbent main body 10 is easy to follow the wearer's gluteal groove. Further, the back side (back side) of the waistline member 20 is also likely to contract in the right-left direction, and therefore, even when the wearer turns over or the like, the bonded state of being bonded to the hip portion is likely to be maintained.

Fig. 7 is a view illustrating a bottom joining portion 70 joining the chassis 14 and the side sheet 15 in the absorbent main body 10. As also illustrated in fig. 4, the chassis 14 and the side sheet 15 are laminated in the thickness direction at a position on the non-skin side of the absorbent core 11. Further, the chassis 14 and the side sheet 15 are joined to each other via the bottom joining portions 70 in a state where the absorbent elastic member 50 in an extended state is sandwiched therebetween. As shown in fig. 7, the bottom joint section 70 is formed by arranging a plurality of joint materials such as a hot-melt adhesive applied in a thin band shape along the longitudinal direction (vertical direction) at predetermined intervals in the horizontal direction.

As shown in fig. 7, 2 band-shaped bottom

joint portions

70 and 70 are disposed between the 1 st elastic member 51 and the 2 nd elastic member 52, and 1 band-shaped bottom joint portion 70 is disposed between the 2 nd elastic member 52 and the 3 rd elastic member 53 in the left-right direction. That is, in the present embodiment, the area of the bottom joint portion 70 per unit area of the region between the 1 st elastic member 51 and the 2 nd elastic member 52 is larger than the area of the bottom joint portion 70 per unit area of the region between the 2 nd elastic member 52 and the 3 rd elastic member 53. According to such a structure, at least in the region between the 1 st elastic member 51 and the 2 nd elastic member 52, the chassis 14 and the side sheet 15 are firmly joined as compared with the region between the 2 nd elastic member 52 and the 3 rd elastic member 53, and the rigidity of the absorbent main body 10 is improved.

As described above, the high-density portion 40 is provided in the region between the 1 st elastic member 51 and the 2 nd elastic member 52 in the lateral direction, and is a portion that becomes a bending start point when the absorbent main body 10 is three-dimensionally deformed when the sanitary napkin 1 is worn. Therefore, the rigidity of the absorbent main body 10 is increased in this region, so that the absorbent main body 10 (absorbent core 11) is easily bent in a habitual manner, and the shape is easily maintained when the absorbent core 11 is deformed in a protruding manner as shown in fig. 5B. This makes it easy to maintain the state in which the absorbent body 10 is attached to the crotch of the wearer, and to improve the absorption of menstrual blood and the like, thereby suppressing leakage.

As shown in fig. 2, in the sanitary napkin 1, the lower end 20web of the side joining portion 20we (both end portions 20fe) formed in the front waist member 20f is positioned higher than the upper end 50fu of the front side of the absorbent elastic member 50 in the vertical direction. That is, the side joining portions 20we (both end portions 20fe) of the front waist member 20f do not overlap with the absorber elastic member 50 in the vertical direction. Therefore, when the wearer takes a forward bent posture or moves his legs forward while wearing the sanitary napkin 1, even if the front waist member 20f deforms in accordance with the movement of the wearer's body (ventral side), the influence of the deformation is less likely to propagate to the absorber elastic members 50. Therefore, when the wearer moves his or her body, the absorbent main body 10 is prevented from shifting in conjunction with the movement of the front waist member 20f, and the good fit of the absorbent main body 10 can be easily maintained. This makes it possible to more easily suppress leakage of menstrual blood or the like.

Fig. 8 is a view illustrating the body coupling portion 80 for mounting and coupling the absorbent body 10 to the lumbar member 20. In the sanitary napkin 1, the non-skin side surface of the absorbent main body 10 (the non-skin side surface of the side sheet 15) and the skin side surface of the waist member 20 are joined to each other by a main body joint portion 80 shown by the hatched portion in fig. 8. The body joint portion 80 is formed by a joint material such as a hot melt adhesive.

In the sanitary napkin 1 of the present embodiment, the width of the body joining portion 80 in the lateral direction is greater at both ends in the longitudinal direction (upper end in the vertical direction) than at the center in the longitudinal direction (crotch portion). That is, the body joint 80 has a portion having a width W70a in the left-right direction at the front and rear end portions in the longitudinal direction (front upper end portion and rear upper end portion in the pants-type state), and a portion having a width W70b narrower than W70a between the front end portion and the rear end portion in the longitudinal direction (lower end portion in the pants-type state) (W70a > W70 b). According to such a structure, the absorbent main body 10 is joined to the waistline member 20 over a large area at both ends in the longitudinal direction, and the absorbent main body 10 is less likely to be twisted or deformed. Thus, the absorbent main body 10 is easily fitted over a large area in a flat manner on the abdomen and buttocks of the wearer. On the other hand, in the center portion (crotch portion) in the longitudinal direction, the portion where the absorbent main body 10 is joined to the waist member 20 is narrow, and therefore, the absorbent main body 10 is easily deformed accordingly. Therefore, the rigidity of the absorbent main body 10 in the vicinity of the crotch portion of the wearer is not excessively high, the absorbent main body 10 is easily deformed, and the occurrence of discomfort due to the side edges of the absorbent main body 10 being pressed against the groin portions of the wearer when the sanitary napkin 1 is worn can be suppressed. In this way, the absorbent main body 10 can be easily appropriately fitted to the entire body (the abdomen, the crotch, and the buttocks) of the wearer, and leakage of menstrual blood and the like can be easily suppressed.

Further, the distance W51 in the left-right direction of the pair of 1 st

elastic members

51, 51 is narrower than the widths W70a, W70b in the left-right direction of the body joint portion 80 (W51< W70). Since the side sheet 15 constituting the leakage preventing wall portion 30 is joined to the waistline member 20 by the body joint portion 80, the side sheet 15 can be bent toward the skin side with both ends in the left-right direction of the body joint portion 80 as boundaries when the leakage preventing wall portion 30 is erected toward the skin side. That is, both ends of the body joint portion 80 in the left-right direction are positions that become rising starting points when the leakage preventing wall portion 30 rises toward the skin side. Therefore, by setting W51< W70, the contraction force generated by the 1 st

elastic members

51, 51 is less likely to act at the rising start point of the leakage preventing wall 30, and deformation (rising) of the leakage preventing wall 30 is less likely to be inhibited.

Further, the interval W51 in the left-right direction of the pair of first

elastic members

51, 51 is wider than 1/2 of the width W11 of the absorbent core 11 (W51> W11/2). If the distance W51 between the 1 st

elastic members

51, 51 is equal to or less than 1/2 of the width W11 of the absorbent core 11, the area of the central portion becomes narrower and the areas of both side portions become wider in the left-right direction of the absorbent core 11. In this case, it is difficult for the absorbent core 11 to form a convex shape as described in fig. 5B, and the central portion in the left-right direction of the absorbent core 11 is difficult to be attached to the excretory opening. Even if the 1 st elastic member 51 contracts, the left and right side portions of the absorbent core 11 do not sufficiently lift up, and the absorbent core 11 is less likely to adhere to the groin portion of the wearer. In contrast, by making the interval W51 between the 1 st

elastic members

51, 51 larger than 1/2 of the width W11 of the absorbent core 11, the absorbent core 11 is easily appropriately deformed to be convex, and good attachment is easily achieved.

The high-density portion 40 of the present embodiment does not overlap a folding line (center position CL in the longitudinal direction) when the sanitary napkin 1 is folded in two in the front-rear direction. In fig. 4, the center position CL is arranged between the 2 nd high-density portion 42 and the 3 rd high-density portion 43 in the longitudinal direction. That is, the high-density portion 40 is provided so as not to have a portion overlapping with the center position CL (diagonal line) in the longitudinal direction. Since the high-density portions 40 are discontinuous in the longitudinal direction with the fold lines interposed therebetween, when the sanitary napkin 1 is worn, the motion on the abdomen side and the motion on the back side are difficult to be interlocked, and the absorbent main body 10 is likely to be deformed independently in each region. Therefore, the front side and the back side of the absorbent body 10 can easily follow the movement of the wearer's body, and the fit can be further improved. This makes it possible to easily suppress leakage of menstrual blood and the like.

Further, the high-density portion 40 of the sanitary napkin 1 has an inverted portion 40r inverted to the opposite side in the longitudinal direction. In fig. 4, the 2 nd high-density portion 42 has a reversed portion 42r1 whose front end in the longitudinal direction is reversed to the rear side, and has a reversed portion 42r2 whose rear end in the longitudinal direction is reversed to the front side. The inverted portions 42r1 and 42r2 are disposed across the 1 st elastic member 51 in the left-right direction. That is, the inverted portions 42r1, 42r2 have portions that intersect the 1 st elastic member 51. In the portions where the inversion portions 42r1, 42r2 intersect the 1 st elastic member 51, the contraction force of the 1 st elastic member 51 is less likely to act on the absorbent core 11 under the influence of the inversion portions 42r1, 42r 2. Therefore, by adjusting the arrangement of the inversion sections 40r, the deformation of the absorbent core 11 can be locally controlled. For example, in the case of fig. 4, by reducing the contraction force generated by the 1 st elastic member 51 between the inverting section 42r1 and the inverting section 42r2, the absorbent core 11 is more likely to maintain a planar shape in this region than in other regions. By doing so, the absorbent core 11 can be easily attached along the plane of the abdomen of the wearer.

The term "other" means

The above embodiments are for easy understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

In the above embodiment, the sanitary napkin 1 has been described as an example of the pants-type absorbent article, but the present invention can also be applied to absorbent articles other than sanitary napkins. For example, the pants-type absorbent article may be a pants-type (pants-type) diaper for children and adults, a pants-type (pants-type) absorbent pad, or the like.

In the above embodiment, stretchable sheets such as stretchable nonwoven fabric are used as the

skin side sheets

22 and 23 constituting the lumbar member 20 to impart stretchability in the left-right direction to the lumbar member 20, but other stretchable members may be provided to the lumbar member 20. For example, as shown in fig. 2, rubber band isosceles elastic members 25 may be provided at the upper end portions of the front and

rear waist members

20f and 20b so as to be stretchable in the left-right direction. By providing such a waistline elastic member 25, the fit of the waistline opening 1b is further improved, and the positional displacement of the waistline member 20 can be suppressed when the sanitary napkin 1 is worn.

When the waistline elastic member 25 is provided to the waistline member 20, at least a part of the waistline elastic member 25 is preferably disposed so as to overlap with the

skin side sheets

22 and 23, respectively. By doing so, the stretchability in the left-right direction exhibited by the waistline elastic member 25 and the stretchability in the left-right direction exhibited by the

skin side sheets

22, 23 are interlocked, and the fitting property of the sanitary napkin 1 to the waistline of the wearer can be further improved.

Claims

1. An underpants-type sanitary napkin having an up-down direction, a left-right direction and a front-rear direction that intersect with each other,

The underpants-type sanitary napkin has an absorbent main body including a liquid-absorbent absorbent core, and a waist member that is stacked on the non-skin side of the absorbent main body, and is characterized in that:

A plurality of elastic members that expand and contract in the up-down direction are provided at predetermined intervals in the left-right direction at a position on the non-skin side of the absorptive core of the absorptive main body,

The elastic member includes a first elastic member arranged on the outermost side and a second elastic member arranged adjacent to the first elastic member on the inner side of the first elastic member on both sides in the left-right direction, respectively. ,

The said absorptive main body has the high density part in which the density of the said absorptive core is higher than the density of the surrounding part at least in the area|region located between the said 1st elastic member and the said 2nd elastic member in the said left-right direction .

2. An underpants-type sanitary napkin having an up-down direction, a left-right direction and a front-rear direction that intersect with each other,

The elastic member includes a first elastic member arranged on the outermost side and a second elastic member arranged adjacent to the first elastic member inside the first elastic member on both sides in the left-right direction, respectively. ,

The said absorptive main body has the high density part which the density of the said absorptive core is higher than the density of the surrounding part on both sides in the said left-right direction,

When viewed in the front-rear direction, the region where the first elastic member is arranged and the region where the second elastic member is arranged in the absorptive main body each has a shape that protrudes toward the wearer's skin side.

3. The underpants-type sanitary napkin according to claim 1 or 2, characterized in that,

The underpants-type sanitary napkin has a fold line when the underpants-type sanitary napkin is folded in half along the front-rear direction,

The length of the portion where the contracting force by the elastic member acts at the position rearward of the half-fold line is longer than the length of the portion where the contracting force by the elastic member acts at the position farther than the half-fold line. The length of the part is long.

4. The underpants-type sanitary napkin according to claim 3, wherein

A pair of leak-proof wall portions are provided on both side portions in the left-right direction of the absorptive main body,

The leak-proof wall portion has a leak-proof wall elastic member that expands and contracts along the up-down direction,

At least at a position rearward of the half-fold line, the length of the portion to which the contraction force by the elastic member acts is longer than the length of the portion to which the contraction force of the leak-preventing wall elastic member acts.

5. The underwear-type sanitary napkin according to claim 3 or 4, characterized in that,

The high-density portion has a rear-side convex portion from the outer side in the left-right direction toward the inner side and from the lower side in the vertical direction toward the upper side at the upper end portion on the rear side of the half-fold line,

The said 1st elastic member is located in the said left-right direction at the outer side rather than the outer side end of the said rear side convex part.

6. The underpants-type sanitary napkin according to any one of claims 1 to 5, wherein

The waist member has at least a skin side sheet and a non-skin side sheet laminated on the non-skin side of the skin side sheet,

The underpants-type sanitary napkin has a sheet joining portion for joining the skin side sheet and the non-skin side sheet,

A region where the absorbent body and the waist member overlap when viewed in the thickness direction,

The area on the inner side in the left-right direction of the high-density portion has a smaller total area per unit area of the sheet joining portions than the area on the outer side in the left-right direction than the high-density portion The total area of the sheet joint portions formed per unit area.

7. The underpants-type sanitary napkin according to claim 6, wherein

The region where the absorptive main body and the waist member overlap when viewed in the thickness direction is an inner region in the left-right direction of the high-density portion,

The area on the rear side of the half-fold line when the underpants-type sanitary napkin is folded in the front-rear direction is smaller than the area on the front side of the half-fold line formed in the total area of the sheet joints per unit area. The area is formed in the total area of the sheet joint portions per unit area.

8. The underpants-type sanitary napkin according to any one of claims 1 to 7, wherein

The absorptive main body has a liquid-impermeable backsheet disposed on the non-skin side of the absorptive core, and a side sheet laminated on the non-skin side of the backsheet,

The pant-type sanitary napkin has a bottom joint for joining the bottom sheet and the side sheet,

In the left-right direction, there is a third elastic member disposed inside the second elastic member adjacent to the second elastic member,

In the left-right direction, the area between the first elastic member and the second elastic member is formed in a total area of the bottom joint portion per unit area larger than that between the second elastic member and the second elastic member. The area|region between the said 3rd elastic members is formed in the total area of the said bottom joint part per unit area.

9. The underpants-type sanitary napkin according to any one of claims 1 to 8, wherein

The waist member has a front waist member and a rear waist member,

Both ends in the left-right direction have side joints for joining the front waistline member and the rear waistline member to each other,

The position of the lower end of the side joint portion is higher than the position of the upper end of the first elastic member at a position closer to the front side than the fold line when the underpants-type sanitary napkin is folded in half in the front-rear direction.

10. The underpants-type sanitary napkin according to any one of claims 1 to 9, wherein

This underpants-type sanitary napkin has a main body joining portion that joins the absorptive main body to the skin side of the waist portion,

In the said left-right direction, the space|interval of a pair of said 1st elastic member is larger than 1/2 of the width of the said absorptive core, and is smaller than the width of the said main-body joint part.

11. The underpants-type sanitary napkin according to claim 10, wherein

The width of the main body engaging portion at the upper end portion in the up-down direction is larger than the width of the main body engaging portion at the lower end portion in the up-down direction.

12. The underpants-type sanitary napkin according to any one of claims 1 to 11, wherein

There is no portion where the high-density portion overlaps the double fold line.

13. The underpants-type sanitary napkin according to any one of claims 1 to 12, wherein

The high-density portion has an inversion portion in which a part of the region is inverted to the opposite side in the vertical direction,

The inversion portion has a portion intersecting with the first elastic member.