CN113382701B

CN113382701B - Absorbent article

Info

Publication number: CN113382701B
Application number: CN201980091259.2A
Authority: CN
Inventors: 大坪俊文
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2019-02-07
Filing date: 2019-12-04
Publication date: 2022-05-27
Anticipated expiration: 2039-12-04
Also published as: KR20210124235A; JP2020127538A; CN113382701A; WO2020162014A1; JP6821721B2

Abstract

An absorbent article (10) has an absorbent main body (10) and an outer cover (30), and the outer cover (30) has a belly-side waistline portion (30a) and a back-side waistline portion (30 b). The outer package (30) has, in the thickness direction, a first hydrophobic sheet (301), a second hydrophobic sheet (302) arranged on the non-skin side with respect to the first hydrophobic sheet (301), and a hydrophilic sheet (303) arranged between the first and second hydrophobic sheets (301, 302). In at least a part of the region of the outer package (30), the non-skin-side surface (303a) of the hydrophilic sheet (303) and the skin-side surface (302a) of the second hydrophobic sheet (302) are in contact with each other. In this region, the density of the first hydrophobic sheet (301) is greater than the density of the second hydrophobic sheet (302).

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article.

Background

As an absorbent article that absorbs excrement such as urine, a disposable diaper and the like are known. For example, patent document 1 discloses a disposable diaper: the diaper comprises a sweat-absorbent sheet disposed on the inner face side of the diaper which is in contact with the skin of the wearer of the diaper; and the diaper maintains its function without substantially reducing the area of the sweat-absorbent sheet during the wearing of the diaper.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2007 and 259874

Disclosure of Invention

Problems to be solved by the invention

In the diaper of patent document 1, since the sweat-absorbent sheet is provided on the inner side surface of the diaper which comes into contact with the skin of the wearer, the sweat-absorbent sheet directly contacts the skin, and the skin is sticky when the sweat-absorbent sheet absorbs sweat. Therefore, there is a risk of causing discomfort to the wearer. In addition, the sweat-absorbent sheet includes hydrophilic fibers, and thus the sweat-absorbent sheet absorbs and retains sweat. However, in the case where the wearer sweats more than the sweat that the sweat-absorbing sheet can absorb, there is a possibility that sweat backflow occurs.

The present invention has been made in view of the problems of the prior art such as described above, and an object of the present invention is to provide an absorbent article which does not become sticky on the skin-side surface even after a hydrophilic sheet absorbs sweat and promotes evaporation of sweat.

Means for solving the problems

A principal aspect of the present invention for achieving the above-described aspect is an absorbent article having a longitudinal direction, a width direction, and a thickness direction that intersect with each other in a deployed state, the absorbent article including: an absorbent main body that absorbs liquid; and an outer covering body having a ventral-side waistline portion and a dorsal-side waistline portion, the ventral-side waistline portion being located on one end side in the longitudinal direction of the absorbent main body, the back waistline portion is positioned on the other end side in the longitudinal direction of the absorbent main body, the outer cover has a first hydrophobic sheet, a second hydrophobic sheet, and a hydrophilic sheet, the first hydrophobic sheet is disposed on the skin side, the second hydrophobic sheet is disposed on the non-skin side with respect to the first hydrophobic sheet, and the hydrophilic sheet is disposed between the first hydrophobic sheet and the second hydrophobic sheet in the thickness direction, a non-skin-side surface of the hydrophilic sheet and a skin-side surface of the second hydrophobic sheet are in contact with each other in at least a part of the region of the outer package, the density of the first hydrophobic sheet is greater than the density of the second hydrophobic sheet in the at least a portion of the area.

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

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, an absorbent article can be provided which does not become sticky on the skin-side surface even after the hydrophilic sheet absorbs sweat and promotes the evaporation of sweat.

Drawings

Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1.

Fig. 2 is a schematic plan view of the diaper 1 in an unfolded and elongated state when viewed from the skin side.

Fig. 3 is a schematic sectional view taken along line C-C in fig. 2.

Fig. 4A is a schematic sectional view of the ventral side of the diaper 1 taken along the line a-a in fig. 1, and fig. 4B is a schematic sectional view of the dorsal side of the diaper 1 taken along the line a-a in fig. 1.

Fig. 5A is a schematic sectional view of the ventral side of the diaper 1 taken along the line B-B in fig. 1, and fig. 5B is a schematic sectional view of the dorsal side of the diaper 1 taken along the line B-B in fig. 1.

Detailed Description

At least the following matters will become clear from the description of the present specification and the accompanying drawings.

An absorbent article having a longitudinal direction, a width direction, and a thickness direction that intersect with each other in a deployed state, the absorbent article comprising: an absorbent main body that absorbs liquid; and an outer covering body having a ventral-side waistline portion and a dorsal-side waistline portion, the ventral-side waistline portion being located on one end side in the longitudinal direction of the absorbent main body, the back waistline portion is positioned on the other end side in the longitudinal direction of the absorbent main body, the outer cover has a first hydrophobic sheet, a second hydrophobic sheet, and a hydrophilic sheet, the first hydrophobic sheet is disposed on the skin side, the second hydrophobic sheet is disposed on the non-skin side with respect to the first hydrophobic sheet, and the hydrophilic sheet is disposed between the first hydrophobic sheet and the second hydrophobic sheet in the thickness direction, a non-skin-side surface of the hydrophilic sheet and a skin-side surface of the second hydrophobic sheet are in contact with each other in at least a part of the region of the outer package, the density of the first hydrophobic sheet is greater than the density of the second hydrophobic sheet in the at least a portion of the area.

According to this absorbent article, in the portion of the outer body where the hydrophilic sheet is disposed between the first hydrophobic sheet and the second hydrophobic sheet, sweat from the skin passes through the first hydrophobic sheet, is absorbed by the hydrophilic sheet, and further evaporates through the second hydrophobic sheet located on the non-skin side. The second hydrophobic sheet has a density lower than that of the first hydrophobic sheet and has better air permeability than the first hydrophobic sheet, so that it is easier to evaporate and vaporize sweat from the second hydrophobic sheet side. Since the skin side sheet is the first hydrophobic sheet having hydrophobicity, the surface of the sheet is not sticky even after sweat passes through the sheet, so that sweat can more easily escape from the second hydrophobic sheet. Thus, the wearer can remain more comfortable.

In the absorbent article, it is desirable that the first hydrophobic sheet comprises at least one of polyethylene and polypropylene.

According to this absorbent article, since the first hydrophobic sheet contains at least any one of polyethylene and polypropylene having a low water absorption rate, the surface of the sheet in contact with the skin can be kept dry. As a result, the wearer can remain comfortable without feeling sticky.

In the absorbent article, it is desirable that the density of the first hydrophobic sheet is 0.05g/cm³To 0.15g/cm³。

According to the absorbent article, the evaporation of sweat from the second hydrophobic sheet (non-skin side) having low density and good air permeability can be promoted by increasing the density of the first hydrophobic sheet disposed on the skin side.

In the absorbent article, it is desirable that the hydrophilic sheet contains pulp fibers.

According to the absorbent article, the hydrophilic sheet having enhanced sweat absorption can absorb sweat passing through the first hydrophobic sheet, and can suppress stickiness of the surface of the first hydrophobic sheet, which is the skin-side surface.

In the absorbent article, it is desirable that the hydrophilic sheet has a density larger than that of the first hydrophobic sheet in the at least one part region.

According to this absorbent article, at least in the part of the region where the non-skin side surface of the hydrophilic sheet and the skin side surface of the second hydrophobic sheet are in contact with each other, the relationship between the densities of the respective sheets is that the density of the hydrophilic sheet is the highest and the density of the second hydrophobic sheet is the lowest (i.e., the densities decrease in the order of the hydrophilic sheet, the first hydrophobic sheet, and the second hydrophobic sheet). Since sweat is absorbed toward the sheet having a high density, the sweat is easily absorbed toward the hydrophilic sheet through the first hydrophobic sheet. Enhancing the transferability of sweat can prevent discomfort such as sticky feeling on the skin-side surface and skin problems. Since the second hydrophobic sheet having the lowest density has good air permeability, sweat absorbed by the hydrophilic sheet evaporates from the second hydrophobic sheet disposed on the non-skin side with respect to the hydrophilic sheet, and the sweat is more easily released.

In the absorbent article, it is desirable that the hydrophilic sheet contains an antibacterial agent, and the antibacterial agent contains cetylpyridinium chloride or catechin.

According to the absorbent article, the antibacterial agent can suppress the growth of bacteria contained in sweat, and the hygiene of the hydrophilic sheet having absorbed sweat can be maintained.

In the absorbent article, it is desirable that the first hydrophobic sheet and the hydrophilic sheet are joined by a hot melt adhesive in a linear or dot pattern.

According to this absorbent article, when the first hydrophobic sheet and the hydrophilic sheet are integrated by being joined in a linear or dot-like manner, the passage of sweat from the first hydrophobic sheet is not unnecessarily hindered, and the absorbency of the pulp fibers constituting the hydrophilic sheet is not inhibited. This makes it possible to absorb sweat without hindering the original functions of the first hydrophobic sheet and the hydrophilic sheet. Therefore, the wearer does not feel discomfort.

In the absorbent article, it is desirable that an elastic member that stretches and contracts in the width direction be provided between the first hydrophobic sheet and the second hydrophobic sheet in a region where the first hydrophobic sheet, the second hydrophobic sheet, and the hydrophilic sheet overlap in the longitudinal direction.

According to this absorbent article, the first hydrophobic sheet, the hydrophilic sheet, and the second hydrophobic sheet are integrally contracted, and the area in direct contact with the skin of the wearer is reduced. This makes it less likely to leave marks of the elastic member on the skin, and reduces discomfort. Further, the area of the hydrophilic sheet that absorbs sweat increases due to contraction of the hydrophilic sheet in the width direction, as compared with a state in which the elastic member is not present in the hydrophilic sheet (a state in which the sheet is not contracted but expanded). Therefore, the sweat absorption property is enhanced, and thus the wearer can maintain more comfort.

In the absorbent article, it is desirable that a plurality of the elastic members are arranged side by side in the longitudinal direction, and a distance between two adjacent elastic members in the longitudinal direction is larger than twice a length of the elastic members themselves in the longitudinal direction.

According to this absorbent article, in the case where the distance between the two elastic members is greater than twice the length of the elastic members themselves in the longitudinal direction, an appropriate space is formed between the

elastic members

35a, 35a in the longitudinal direction, as compared to the case where the distance between the two elastic members adjacent to each other in the longitudinal direction is equal to or less than twice the length of the elastic members themselves in the longitudinal direction. Therefore, the absorption and evaporation of sweat is not hindered by the respective elastic members.

In the absorbent article, it is desirable that the hydrophilic sheet is a tissue paper which is continuously provided between the first hydrophobic sheet and the second hydrophobic sheet from one end in the width direction to the other end in the width direction, and is provided with a first joint portion which is a portion joining one end portion in the width direction of the abdomen-side waist body portion and one end portion in the width direction of the back-side waist body portion, and a second joint portion which is a portion joining the other end portion in the width direction of the abdomen-side waist body portion and the other end portion in the width direction of the back-side waist body portion.

According to this absorbent article, since the hydrophilic sheet is formed of a thin and short fibrous structure, the strength of the joined portion can be ensured without hindering the joining of the end portions in the width direction. That is, when both ends in the width direction of the abdomen-side waistline portion and the back-side waistline portion each including the first hydrophobic sheet, the hydrophilic sheet, and the second hydrophobic sheet are joined by thermal fusion (heat sealing) or the like, the fibers of the tissue are easily cut at the joined portion. This enables the first hydrophobic sheet and the second hydrophobic sheet to be reliably joined. Therefore, the joint strength of the joint portion can be prevented from being reduced.

In this absorbent article, it is desirable that at least one of the first hydrophobic sheet and the second hydrophobic sheet has an opening in a region where the first hydrophobic sheet, the hydrophilic sheet, and the second hydrophobic sheet overlap when viewed in the thickness direction.

According to this absorbent article, when only the first hydrophobic sheet has openings, sweat is drawn out from the openings, and the transfer of sweat to the hydrophilic sheet side is enhanced. This makes it less likely to produce a sticky touch on the surface of the first hydrophobic sheet, so that skin comfort can be maintained. In the case where only the second hydrophobic sheet has openings, evaporation of sweat is further promoted, so that moisture can be prevented. Further, in the case where both the first hydrophobic sheet and the second hydrophobic sheet have openings, both absorption and evaporation of sweat are promoted, so that the skin of the wearer can be kept more comfortable.

In the absorbent article, it is desirable that the hydrophilic sheet has a colored region having a color different from that of either one of the first hydrophobic sheet and the second hydrophobic sheet.

According to this absorbent article, the presence of the hydrophilic layer (hydrophilic sheet) can be visually confirmed, so that the appearance of the diaper can be enhanced.

In the absorbent article, it is desirable that at least a part of the region of the outer cover is a region having only the first hydrophobic sheet, the second hydrophobic sheet, and the hydrophilic sheet.

According to the absorbent article, enhancement of the sweat absorption rate and the sweat evaporation function is greatest in the region formed only by the first hydrophobic sheet, the second hydrophobic sheet, and the hydrophilic sheet. In this region, stickiness on the skin-side surface is suppressed, and sweat is easily evaporated from the non-skin-side surface. Thus, the wearer can remain more comfortable.

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

< basic construction of diaper 1 >

Hereinafter, embodiments will be described with a pants-type disposable diaper (hereinafter also referred to as "diaper 1") as an example of the absorbent article according to the present invention. Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1 (diaper 1). Fig. 2 is a schematic plan view of the diaper 1 in a developed and elongated state when viewed from the skin side. Fig. 3 is a schematic sectional view taken along line C-C in fig. 2.

Here, the "developed state" refers to a state in which the diaper 1 is developed on a plane as follows: by releasing the joining of both end portions of the abdomen-side waistline portion (the abdomen-side waistline portion 30a described later) and the back-side waistline portion (the back-side waistline portion 30b described later) in the width direction of the diaper 1, the abdomen-side waistline portion and the back-side waistline portion are separated from each other, and the diaper 1 is developed in the longitudinal direction thereof. The "extended state" of the diaper 1 refers to a state in which the entire diaper 1 (entire product) is extended without wrinkles, and specifically refers to a state in which the diaper is extended such that the dimensions of the respective constituent members (for example, an absorbent main body 10, a waistline portion 30, and the like described later) of the diaper 1 match or are close to the dimensions of these members themselves.

The diaper 1 has a vertical direction, a width direction, and a front-back direction which intersect each other in the pants-type state shown in fig. 1. The diaper 1 is a so-called three-piece diaper. The diaper 1 comprises: an absorbent main body 10 which is applied to a crotch of a wearer and absorbs liquid such as excretory fluid; and an exterior body 30 covering the waist of the wearer. The outer package 30 has an abdominal-side waistline portion 30a covering the abdominal side of the wearer and a back-side waistline portion 30b covering the back side of the wearer. The upper side in the vertical direction corresponds to the exterior body 30 side, and the lower side corresponds to the stopper side. Further, the front side in the front-rear direction corresponds to the abdominal side of the wearer, and the rear side corresponds to the back side of the wearer.

Thus, in the developed state of fig. 2, the diaper 1 has a longitudinal direction, a width direction, and a thickness direction that intersect each other. Hereinafter, one side in the longitudinal direction in the expanded state is also referred to as "ventral side" or "front side", and the other side in the longitudinal direction is also referred to as "dorsal side" or "rear side". The longitudinal direction in the developed state is a direction along the vertical direction in the pants-type state. As shown in fig. 3, the thickness direction is a direction in which materials constituting the diaper 1 are overlapped. In the thickness direction, the side in contact with the wearer is referred to as the skin side, and the side opposite to the skin side is referred to as the non-skin side.

In the developed state of fig. 2, the absorbent main body 10 is bridged between the abdominal-side waistline portion 30a (positioned on the front side in the longitudinal direction in the drawing) and the back-side waistline portion 30b (positioned on the back side in the longitudinal direction in the drawing) in a state where they are arranged in parallel to each other with a space therebetween in the longitudinal direction. Also, the longitudinal direction end portions 10ea and 10eb of the absorbent main body 10 are joined and fixed to the

nearest waistline portions

30a and 30b, respectively, so that the outer shape of the diaper is substantially H-shaped in plan view. Then, in this state, the absorbent main body 10 is folded in half at the folded position, which is the substantially central portion C10 in the longitudinal direction. The abdominal-side waistline portion 30a and the back-side waistline portion 30b, which face each other in this folded state, are joined and connected to each other at the abdominal-side waistline portion side edge portion 30aes and the back-side waistline portion side edge portion 30bes (i.e., each end portion in the width direction) which are in contact with the side of the wearer. Therefore, these

waist portions

30a and 30b are formed in a ring shape. As a result, the diaper 1 is in a wearing state in which the waistline opening BH and the pair of leg openings LH shown in FIG. 1 are formed. In the following description, the longitudinal end of the abdomen-side waistline portion 30a forming the annular opening portion of the opening BH is defined as an abdomen-side waistline portion upper end 30aet, and the longitudinal end of the back-side waistline portion 30b forming the annular opening portion of the opening BH is defined as a back-side waistline portion upper end 30 beta.

Hereinafter, the absorbent main body 10, the abdomen-side waistline portion 30a, and the back-side waistline portion 30b, which are three constituent members of the diaper 1, will be described with reference to fig. 1 to 3.

< construction of absorbent body 10 >

As shown in fig. 2 and 3, the absorbent main body 10 includes: a liquid-permeable top sheet member 13 forming a skin-side surface; a liquid-impermeable back sheet member 15 forming a non-skin-side surface; an absorbent core 11 disposed between the two

sheet members

13 and 15. In the diaper 1, the absorbent core 11 has a liquid-permeable core-wrapping sheet 12, but it is not necessarily required to have the liquid-permeable core-wrapping sheet 12.

The absorbent core 11 is a member formed by depositing a liquid-absorbent material, and is capable of absorbing excrement such as urine. As the liquid-absorbent material, for example, liquid-absorbent fibers such as pulp fibers and the like can be used. The absorbent core 11 may contain, for example, a super absorbent polymer as the liquid-absorbent particulate matter, or may contain a liquid-absorbent material other than the liquid-absorbent fibers and the liquid-absorbent particulate matter.

The absorbent core 11 of the present embodiment has a ventral end 11a on one side in the longitudinal direction of fig. 2, and a dorsal end 11b on the other side in the longitudinal direction of fig. 2. Then, a narrow portion 11c is provided between the ventral end 11a and the dorsal end 11b, the narrow portion 11c having a width in the width direction that is narrower than the width in the width direction of the ventral end 11a and the dorsal end 11 b. Therefore, the absorbent core 11 has a substantially hourglass shape in plan view as shown in fig. 2, making it easier for the absorbent core 11 to fit the crotch of the wearer. The shape of the absorbent core 11 is not limited to the substantially hourglass shape in the above-described plan view. For example, the absorbent core 11 may be substantially rectangular in plan view.

The top sheet member 13 is a sheet member covering the absorbent core 11 from the skin side, and is, for example, a liquid-permeable nonwoven fabric having a planar size larger than that of the absorbent core 11. The back sheet member 15 is a sheet-like member covering the absorbent core 11 from the non-skin side, and is a sheet having a planar size larger than that of the absorbent core 11. As an example of the back sheet member 15, a sheet of a two-layer structure in which the following sheets are laminated may be provided: a liquid-impermeable leakproof sheet 15a of polyethylene, polypropylene or the like; an exterior sheet 15b formed of nonwoven fabric or the like. Then, the leakage preventing pieces 15a of the back sheet member 15 are bonded to the top sheet member 13 in a frame-like manner at portions of the absorbent core 11 extending outward from four sides in a state where the absorbent core 11 is interposed between the back sheet member 15 and the top sheet member 13. Thereby, the absorbent main body 10 is substantially formed.

In the diaper 1, as shown in fig. 1 to 3, so-called three-dimensional gathers LSG and leg gathers LG are formed by the outer sheet 15 b. The three-dimensional gathers LSG are leakage-preventing wall portions provided upright at each end in the width direction of the topsheet member 13, and the leg gathers LG are stretchable portions around the legs formed at each leg opening LH, LH of the diaper 1. To describe the exterior sheet 15b in detail, first, as shown in fig. 3, the width of the exterior sheet 15b is sufficiently larger than the width of the leakage preventing sheet 15a, that is, the exterior sheet 15b greatly protrudes in the width direction from both sides of the leakage preventing sheet 15a in the width direction. Then, the protruding portion 15bf is folded back toward the widthwise center at the folded position which is the position of the widthwise end 10es of the absorbent main body 10. Also, the leg elastic member 17 such as an elastic thread or the like is fixed in the vicinity of this folded position along the longitudinal direction in a state of being elongated in the longitudinal direction, thereby forming the leg gather LG.

Thereby, the folded portion 15bg folded back toward the width direction center extends further toward the width direction center, and is joined to the width direction end of the top sheet member 13 at a position covering the width direction end. A portion of the exterior sheet 15b located at a position closer to the width direction leading end side with respect to a portion joined to the width direction end of the top sheet member 13 can stand up from the top sheet member 13 and serves as a free end portion LSGf. In addition, an LSG elastic member 18 such as an elastic wire or the like is fixed to the front end portion of the free end portion LSGf in a state elongated in the longitudinal direction along the longitudinal direction. The free end portion LSGf contracts in the longitudinal direction due to the contraction force applied from the LSG elastic member 18 and rises from the top sheet member 13, so the free end portion LSGf functions as a three-dimensional gather LSG.

Although not shown, a liquid-permeable sheet such as tissue paper or the like as a second sheet may also be interposed between the top sheet member 13 and the absorbent core 11 or between the back sheet member 15 and the absorbent core 11 in some cases.

< Structure of the abdomen-side waistline portion 30a and the back-side waistline portion 30b >

As shown in fig. 2, the abdominal-side waistline portion 30a of the exterior body 30 is located on the front side (one end side) in the longitudinal direction of the absorbent main body 10, and the back-side waistline portion 30b is located on the back side (the other end side) in the longitudinal direction of the absorbent main body 10. Fig. 4A is a schematic sectional view of the ventral side taken along line a-a in fig. 1, and fig. 4B is a schematic sectional view of the dorsal side taken along line a-a in fig. 1. Fig. 5A is a schematic sectional view of the ventral side taken along line B-B in fig. 1, and fig. 5B is a schematic sectional view of the dorsal side taken along line B-B in fig. 1.

As shown in fig. 4A and 4B, the abdominal-side waistline portion 30a and the back-side waistline portion 30B of the exterior body 30 each include: a first hydrophobic sheet 301 disposed on the skin side in the thickness direction; a second water-repellent sheet 302 disposed on the non-skin side with respect to the first water-repellent sheet 301; and a hydrophilic sheet 303 disposed between the first hydrophobic sheet 301 and the second hydrophobic sheet 302. The first hydrophobic sheet 301 is a hydrophobic sheet formed of hydrophobic fibers and allows sweat of the wearer to permeate therethrough. The hydrophilic sheet 303 is a hydrophilic sheet capable of absorbing sweat, and details of the hydrophilic sheet 303 will be described later. The second hydrophobic sheet 302 is a hydrophobic sheet made of hydrophobic fibers, similar to the first hydrophobic sheet 301. The second hydrophobic sheet 302 is disposed on the non-skin side of the hydrophilic sheet 303 to promote evaporation of sweat. In addition, in the present embodiment, the hydrophilic sheet 303 is provided in both the abdomen-side waistline portion 30a and the back-side waistline portion 30 b. The hydrophilic sheet 303 may be provided only in the abdomen-side waistline portion 30a or the back-side waistline portion 30 b.

Here, the above-mentioned "hydrophobicity" means that a liquid does not spread on the surfaces of the first and second

hydrophobic sheets

301 and 302, and the surfaces of the first and second

hydrophobic sheets

301 and 302 have a contact angle of more than 90 °. The contact angle refers to an angle between a horizontal plane (horizontal surface) of the first (second) hydrophobic sheet 301(302) and a tangent line of a profile curve of water (droplet) dropped on the horizontal plane at an intersection of the profile curve and the horizontal plane in a state where the droplet contacts the first (second) hydrophobic sheet 301 (302). The contact angle of the first and second

hydrophobic sheets

301 and 302 is greater than 90 °, and the first and second

hydrophobic sheets

301 and 302 have a hydrophobic surface. In contrast, in the case where the contact angle is less than 90 °, the sheet is determined to be a hydrophilic sheet having high hydrophilicity. The surface of the hydrophilic sheet 303 has a contact angle of less than 90 °.

Further, as shown in fig. 2, 4A, and 4B, the second hydrophobic sheet 302 has a folded portion 302F; the folded-back portion 302F extends from the abdomen-side waistline portion upper end 30aet and the back-side waistline portion upper end 30 beta in the up-down direction toward the upper side, and is folded back toward the skin facing surface of the first hydrophobic sheet 301 at a folded position extending along the peripheral edge portion of the waist opening BH, the folded position being the abdomen-side waistline portion upper end 30aet and the back-side waistline portion upper end 30 beta. In the present embodiment, the folded portion 302F covers the front end and the rear end in the longitudinal direction of the absorbent main body 10. However, the folded-back portion 302F may be shortened so as not to cover the front end and the rear end.

As described above, since the hydrophilic sheet 303 is disposed between the first hydrophobic sheet 301 and the second hydrophobic sheet 302, sweat from the wearer's skin first passes through the folded back portion 302F of the second hydrophobic sheet 302, passes through the first hydrophobic sheet 301, and is then absorbed by the hydrophilic sheet 303. The absorbed sweat is then further evaporated via the second hydrophobic sheet 302 located on the non-skin side.

Further, in the exterior body 30, an air-permeable membrane (not shown) which is formed of an air-permeable material and does not allow liquid to pass therethrough may be provided in a part of the space between the second hydrophobic sheet 302 and the hydrophilic sheet 303 disposed on the most non-skin side in the thickness direction. In particular, as shown in fig. 4A and 4B, at a substantially central portion in the width direction of the diaper 1, since the absorbent main body 10 is present on the lower side in the up-down direction, the wearer is more likely to sweat and to generate wetness. Therefore, the provision of such a breathable film may further promote the evaporation of sweat.

In general, the arrangement of a sweat-absorbent hydrophilic sheet (here, hydrophilic sheet 303) between hydrophobic sheets (in this example, hydrophobic sheets 301 and 302) allows sweat to be rapidly absorbed, and also allows the hydrophilic sheet to reduce the sticky feeling on the skin because it does not come into direct contact with the skin. However, when the hydrophilic sheet absorbs a large amount of sweat, there is a risk of sweat flowing back.

Therefore, in order to further enhance the absorption and evaporation of sweat, the exterior body 30 according to the present invention adopts, for example, the following configuration. As shown in fig. 5A and 5B, the non-skin side surface 303a of the hydrophilic sheet 303 and the skin side surface 302a of the second hydrophobic sheet 302 contact each other in at least a partial region of the exterior body 30. Thus, it is preferable that the density of the first hydrophobic sheet 301 is greater than the density of the second hydrophobic sheet 302 in the one part region. The second hydrophobic sheet 302 having a lower density than the first hydrophobic sheet 301 has good air permeability, so that sweat absorbed by the hydrophilic sheet 303 is more easily evaporated and vaporized from the second hydrophobic sheet 302 side (non-skin surface side). Further, since the first hydrophobic sheet 301 and the folded portion 302F disposed on the skin side have hydrophobicity, the skin-side surface does not become sticky even after sweat passes through the sheet, and the wearer can be kept comfortable.

As described above, the "density" in the present embodiment refers to the density in at least a part of the region of the exterior body 30, and preferably the same density relationship is achieved in a wider region of the exterior body 30. The at least one partial region is, for example, a region located in the abdomen-side waist portion 30a (back-side waist portion 30B) and in the vicinity of a portion where the line B-B shown in fig. 1 or fig. 2 intersects the hydrophilic property 303. In this region, 1cm square test pieces were collected from the first hydrophobic sheet 301, the second hydrophobic sheet 302, and the hydrophilic sheet 303, respectively, and the density was measured. In the present embodiment, it is sufficient to confirm the magnitude relation of the densities of the respective sheets. Therefore, it is not necessary to obtain exact values, which are allowable even if there is some error in the measured values.

In addition, in the present embodiment, it is desirable that the density of the first hydrophobic sheet 301 is 0.05g/cm³To 0.15g/cm³Within the range of (1). Increasing the density of the first hydrophobic sheet 301 may facilitate the absorption of sweat by the hydrophilic sheet 303 from the coarse and hydrophobic combinationThe second hydrophobic sheet 302 having good air permeability (non-skin side) evaporates, but does not evaporate from the first hydrophobic sheet 301 located on the skin side.

In addition, in the present embodiment, it is desirable that the density of the hydrophilic sheet 303 is greater than the density of the first hydrophobic sheet 301. Specifically, it is desirable that the density of the hydrophilic sheet 303 is 0.15g/cm³To 0.6g/cm³Within the range of (1). Therefore, in the region where the non-skin side surface 303a of the hydrophilic sheet 303 and the skin side surface 302a of the second hydrophobic sheet 302 contact each other, the hydrophilic sheet 303 has the highest density and the second hydrophobic sheet 302 has the lowest density. That is, the density decreases in the order of the hydrophilic sheet 303, the first hydrophobic sheet 301, and the second hydrophobic sheet 302. In general, since sweat is absorbed toward a sheet having a high density, sweat of a wearer is first easily absorbed toward the hydrophilic sheet 303 through the first hydrophobic sheet 301. Enhancing the transferability of sweat can prevent discomfort such as stickiness on the skin-side surface and skin problems. Since the second hydrophobic sheet 302 having the lowest density has good air permeability, sweat absorbed by the hydrophilic sheet 303 is easily evaporated from the second hydrophobic sheet 302 disposed on the non-skin side surface with respect to the hydrophilic sheet 303. Due to such a density relationship, sweat easily escapes from the diaper 1, and the wearer can be kept comfortable even when sweating.

Further, it is desirable that the first hydrophobic sheet 301 contains at least one of Polyethylene (PE) and polypropylene (PP). The water absorption of polyethylene and polypropylene is very low. Therefore, including any one of polyethylene and polypropylene allows the surface of the first hydrophobic sheet 301 to remain dry even after sweat passes through the first hydrophobic sheet 301. As a result, the wearer can remain comfortable without feeling sticky.

Thus, in order to promote the absorption of sweat, it is desirable that the hydrophilic sheet 303 contains pulp fibers, and examples of the hydrophilic sheet 303 include pulp sheets, tissue paper, and the like. Therefore, the sweat absorption property of the hydrophilic sheet 303 is enhanced, and the hydrophilic sheet 303 rapidly absorbs sweat passing through the first hydrophobic sheet 301, so that the stickiness of the surface of the first hydrophobic sheet 301 disposed on the skin side can be suppressed.

In addition, in order to maintain the hygiene of the sheet even after sweat absorption, it is desirable that the hydrophilic sheet 303 contains an antibacterial agent, and as an example of the antibacterial agent, it is desirable that the hydrophilic sheet contains cetylpyridinium chloride, catechin, or the like. In the present embodiment, the antibacterial performance is obtained by adsorbing the cetyl pyridinium chloride or the like to the pulp fibers constituting the hydrophilic sheet 303. As a result, the growth of bacteria contained in sweat can be suppressed, and the hygiene of the hydrophilic sheet 303 that has absorbed sweat can be maintained.

The first hydrophobic sheet 301 and the hydrophilic sheet 303 are joined by a hot melt adhesive in a linear or dot pattern. Hot melt adhesives here mean thermoplastic adhesives which melt by heating and can be applied in the fluid state. Although the first hydrophobic sheet 301 and the hydrophilic sheet 303 are integrated by joining the two sheets, the hot melt adhesive applied in a linear or dot pattern does not hinder the passage of sweat through the first hydrophobic sheet 301 to an extent necessary and does not hinder the absorbency of the pulp fibers constituting the hydrophilic sheet 303. This makes it possible to absorb sweat without hindering the original functions of the first hydrophobic sheet 301 and the hydrophilic sheet 303, making the wearer less likely to feel discomfort.

In the abdomen-side waistline portion 30a and the back-side waistline portion 30B shown in fig. 4A and 4B, the second hydrophobic sheet 302 has a folded-back portion 302F folded back at a folded position which is the abdomen-side waistline portion upper end 30aet and the back-side waistline portion upper end 30 bet. However, a configuration in which the second hydrophobic sheet 302 is not folded back may be employed. That is, the upper end of the second hydrophobic sheet 302 in the up-down direction may terminate at the same position as the upper end of the first hydrophobic sheet 301 in the up-down direction. In this case, the regions having only the first hydrophobic sheet 301, the second hydrophobic sheet 302, and the hydrophilic sheet 303 are formed in the abdomen-side waistline portion 30a and the back-side waistline portion 30b of the outer cover 30. In the region formed only by the first hydrophobic sheet 301, the second hydrophobic sheet 302, and the hydrophilic sheet 303, the enhancement of the absorption of sweat and the evaporation function of sweat is greatest. This suppresses stickiness of the skin-side surface (the skin-side surface of the first hydrophobic sheet 301), and makes it easier to evaporate sweat from the non-skin-side surface (the non-skin-side surface of the second hydrophobic sheet 302). Thus, the wearer can remain more comfortable.

In addition, as shown in fig. 2, a plurality of elastic members 35, … … such as elastic threads are arranged in the width direction in the abdomen-side waistline portion 30a and the back-side waistline portion 30b in a state of being elongated in the width direction. As a result, both the abdominal-side waistline portion 30a and the back-side waistline portion 30b are provided with the scalability in the width direction. Further, the plurality of elastic members 35, … … are arranged side by side in the longitudinal direction at intervals in the longitudinal direction. In this specification, the elastic member 35 provided in the abdominal-side waistline portion 30a is referred to as an abdominal-side elastic member 35a, and the elastic member 35 provided in the back-side waistline portion 30b is referred to as a back-side elastic member 35 b.

As shown in fig. 4A and 4B, in the region where the first hydrophobic sheet 301, the second hydrophobic sheet 302, and the hydrophilic sheet 303 overlap in the up-down direction (longitudinal direction), the hydrophilic sheet 303 is located between the first hydrophobic sheet 301 and the second hydrophobic sheet 302, and each abdominal-side elastic member 35a and each back-side elastic member 35B are disposed between the first hydrophobic sheet 301 and the second hydrophobic sheet 302. Since each of the

elastic members

35a and 35b is configured in the foregoing manner, the first hydrophobic sheet 301, the hydrophilic sheet 303, and the second hydrophobic sheet 302 are integrally contracted, so that the area in direct contact with the skin of the wearer can be reduced. This makes it less likely to leave marks of the

elastic members

35a and 35b on the skin, reducing discomfort. In addition, the sweat absorbing area of the hydrophilic sheet 303 is increased by the shrinkage of the hydrophilic sheet 303 in the width direction, compared to a state where no elastic member is present in the region overlapping with the hydrophilic sheet 303 in the up-down direction (a state where the hydrophilic sheet 303 is not shrunk but is spread). Therefore, the sweat absorption property is enhanced, and thus the wearer can maintain more comfort.

In addition, it is desirable that, among the plurality of elastic members 35(35a and 35b) arranged side by side in the longitudinal direction, taking the example shown in fig. 4A, the distance (L2) between two

elastic members

35a and 35a adjacent to each other in the longitudinal direction (up-down direction) is larger than twice the length (L1) in the up-down direction (longitudinal direction) of one elastic member 35a itself. According to this configuration, in comparison with the case where the distance (L2) between the two

elastic members

35a and 35a adjacent to each other in the length direction is equal to or less than twice the length (L1) of the elastic member 35a itself in the length direction, in the case where the distance (L2) between the two

elastic pieces

35a and 35a adjacent to each other in the length direction is greater than twice the length (L1) of the elastic member 35a itself in the length direction, an appropriate space is formed between the

elastic members

35a and 35a in the length direction. Therefore, the absorption and evaporation of sweat are not hindered by the respective elastic members 35a, and sweat easily escapes.

As described above, it is desirable that the hydrophilic sheet 303 contains pulp fibers, and in the case where the hydrophilic sheet 303 is a tissue paper, as shown in fig. 2, the tissue paper may be continuously disposed from one end in the width direction to the other end in the width direction between the first hydrophobic sheet 301 and the second hydrophobic sheet 302 (refer to the region indicated by hatching in fig. 2). Then, in order to form the diaper 1 in the worn state (fig. 1), the first joined portion 31 and the second joined portion 32 are provided: the first joint portions 31 are portions that join the one widthwise end portion (one of the abdomen-side waistline portion side edge portions 30 aes) of the abdomen-side waistline portion 30a and the one widthwise end portion (one of the back-side waistline portion side edge portions 30bes) of the back-side waistline portion 30b (fig. 1); the second joint portion 32 is a portion that joins the other widthwise end portion (the other of the abdomen-side waistline portion side edge portions 30 aes) of the abdomen-side waistline portion 30a and the other widthwise end portion (the other of the back-side waistline portion side edge portions 30bes) of the back-side waistline portion 30b (fig. 1). When the first joint portion 31 and the second joint portion 32 are formed, the hydrophilic sheets 303 continuously provided from one end in the width direction to the other end in the width direction are also joined together. In such a case, the hydrophilic sheet 303 as a different material is present between the first hydrophobic sheet 301 and the second hydrophobic sheet 302, and the possibility of a decrease in the bonding strength is generally considered. However, since the hydrophilic sheet 303 is formed of a thin and short fibrous structure, when the widthwise both ends of the abdomen-side waistline portion 30a and the back-side waistline portion 30b are joined by thermal welding (heat sealing) or the like, the fibers of the structure are easily cut at the joined portion. This makes it possible to reliably join the first hydrophobic sheet 301 and the second hydrophobic sheet 302. Therefore, a decrease in the bonding strength between the first hydrophobic sheet 301 and the second hydrophobic sheet 302 can be prevented.

In addition, as shown in fig. 5A and 5B, at least one of the first hydrophobic sheet 301 and the second hydrophobic sheet 302 may have an opening (not shown) in an overlapping region of the first hydrophobic sheet 301, the hydrophilic sheet 303, and the second hydrophobic sheet 302 as viewed in the thickness direction. The above-mentioned "overlapping region as viewed in the thickness direction" means a region where the hydrophilic sheet 303 is disposed (a region of the hydrophilic sheet 303 shown by hatching) at the overlapping portion of the abdomen-side waistline portion 30a and the back-side waistline portion 30b in fig. 2 as viewed in the thickness direction. In the case where only the first hydrophobic sheet 301 has openings in this region, sweat is drawn in from the openings, and the transferability of sweat to the hydrophilic sheet 303 side is enhanced. This makes it less likely to produce a sticky touch on the surface of the first hydrophobic sheet 301, so that skin comfort can be maintained. In the case where only the second hydrophobic sheet 302, which is a non-skin-side surface, has openings in this area, evaporation of sweat is further promoted, so that skin comfort can be maintained. In addition, in the case where both the first hydrophobic sheet 301 and the second hydrophobic sheet 302 have openings, both absorption and evaporation of sweat are promoted, and the skin of the wearer can be kept more comfortable.

Further, it is desirable that the hydrophilic sheet 303 has a colored region (not shown) of a color different from that of the first hydrophobic sheet 301 or the second hydrophobic sheet 302. Due to the colored region, the presence of the hydrophilic sheet 303 capable of absorbing sweat can be visually recognized, so that the appearance beauty of the diaper can be enhanced. In addition, the colored region may not only be colored but also have a designable pattern or figure.

Other embodiments are also possible

Although the above embodiments of the present invention have been described, the above embodiments are for facilitating understanding of the present invention and are not intended to limit the explanation of the present invention. Further, the present invention may be modified or improved without departing from the spirit thereof, and furthermore, it is needless to say that equivalents of the present invention are also included in the present invention.

In the above-described embodiment, the pants-type disposable diaper 1 is shown as an example of an absorbent article, but the present invention is not limited thereto. For example, a tape type disposable diaper may be used. In addition, as an example of the pants-type disposable diaper 1, a so-called three-piece diaper is shown in which the absorbent main body 10 is bridged between the abdomen-side waistline portion 30a and the back-side waistline portion 30b in the developed state of the diaper. But a so-called two-piece diaper may be used in which the absorbent main body is placed on the skin-side surface of the outer sheet having a substantially hourglass shape in the unfolded state of the diaper.

In the above embodiment, the hydrophilic sheet 303 is continuously provided from one end in the width direction to the other end in the width direction, but the present invention is not limited thereto. The hydrophilic sheet 303 may be separated from both end portions (30aes and 30bes) in the width direction. In addition, the plurality of hydrophilic sheets 303 may be intermittently disposed side by side in the width direction instead of being continuously disposed.

Description of the reference numerals

1 diaper (absorbent article),

10 absorbent main body, 10ea end portion, 10eb end portion, 10es end portion,

13 a top sheet member, 15a back sheet member, 15bg folded parts,

11 absorbent core, 11a ventral end, 11b dorsal end,

11c narrow part,

12 core wrapping sheets,

15a anti-leakage sheet, 15b external sheet,

17 leg elastic members,

18 LSG elastic member,

30 outer body, 30a abdomen-side waist-body part, 30b back-side waist-body part,

30aes ventral-side waist-side edge portion, 30bes dorsal-side waist-side edge portion,

30aet abdomen side waist upper end, 30bet back side waist upper end,

31 a first joint part, 32 a second joint part,

35 elastic member, 35a ventral elastic member, 35b dorsal elastic member,

301 a first hydrophobic sheet,

302 second hydrophobic sheet, 302F folded portion, 302a skin-side surface,

303a hydrophilic sheet, 303a non-skin-side surface,

Substantially the central part of C10,

LH leg opening, BH waist opening,

LSG three-dimensional pleat, LSgf free end

Claims

1. An absorbent article having a longitudinal direction, a width direction and a thickness direction which intersect each other in an unfolded state,

the absorbent article includes:

an absorbent main body that absorbs liquid; and

an exterior body having a belly-side waistline portion and a back-side waistline portion,

the abdomen-side waistline portion is positioned on one end side in the longitudinal direction of the absorbent main body,

the back waistline portion is located on the other end side in the longitudinal direction of the absorbent main body,

the outer package has a first hydrophobic sheet, a second hydrophobic sheet, and a hydrophilic sheet, and in the thickness direction,

the first hydrophobic sheet is disposed on the skin side,

the second hydrophobic sheet is disposed on the non-skin side with respect to the first hydrophobic sheet,

the hydrophilic sheet is disposed between the first hydrophobic sheet and the second hydrophobic sheet,

a non-skin-side surface of the hydrophilic sheet and a skin-side surface of the second hydrophobic sheet are in contact with each other in at least a part of the region of the outer package,

the density of the first hydrophobic sheet is greater than the density of the second hydrophobic sheet in the at least a portion of the area.

2. The absorbent article according to claim 1,

the first hydrophobic sheet comprises at least one of polyethylene and polypropylene.

3. The absorbent article according to claim 1 or 2,

the first hydrophobic sheet has a density of 0.05g/cm³To 0.15g/cm³。

4. The absorbent article according to claim 1,

the hydrophilic sheet comprises pulp fibers.

5. The absorbent article according to claim 1,

the hydrophilic sheet has a density greater than a density of the first hydrophobic sheet in the at least a portion of the region.

6. The absorbent article according to claim 1,

the hydrophilic sheet contains an antibacterial agent, and

the antibacterial agent comprises cetylpyridinium chloride or catechin.

7. The absorbent article according to claim 1,

the first hydrophobic sheet and the hydrophilic sheet are joined by a hot melt adhesive in a linear or dot pattern.

8. The absorbent article according to claim 1,

in a region where the first hydrophobic sheet, the second hydrophobic sheet and the hydrophilic sheet overlap in the longitudinal direction,

an elastic member that stretches and contracts in the width direction is provided between the first hydrophobic sheet and the second hydrophobic sheet.

9. The absorbent article of claim 8,

a plurality of the elastic members are arranged side by side along the length direction, and

the distance between two of the elastic members adjacent in the length direction is greater than twice the length of the elastic members themselves in the length direction.

10. The absorbent article according to claim 1,

the hydrophilic sheet is a tissue paper,

the tissue paper is continuously disposed between the first hydrophobic sheet and the second hydrophobic sheet from one end in the width direction to the other end in the width direction, and

a first engagement portion and a second engagement portion are provided,

the first joining part is a part joining one end part in the width direction of the abdomen-side waist part and one end part in the width direction of the back-side waist part,

the second joining portion is a portion joining the other end portion in the width direction of the abdomen-side waist portion and the other end portion in the width direction of the back-side waist portion.

11. The absorbent article according to claim 1,

in a region where the first hydrophobic sheet, the hydrophilic sheet, and the second hydrophobic sheet overlap when viewed in the thickness direction,

at least one of the first and second hydrophobic sheets has an opening.

12. The absorbent article according to claim 1,

the hydrophilic sheet has a colored region having a color different from that of either one of the first hydrophobic sheet and the second hydrophobic sheet.

13. The absorbent article according to claim 1,

at least a part of the region of the outer package is a region having only the first hydrophobic sheet, the second hydrophobic sheet, and the hydrophilic sheet.