WO2020162015A1

WO2020162015A1 - Absorbent article

Info

Publication number: WO2020162015A1
Application number: PCT/JP2019/047320
Authority: WO
Inventors: 大坪　俊文; 哲郎大窪
Original assignee: ユニ・チャーム株式会社
Priority date: 2019-02-07
Filing date: 2019-12-04
Publication date: 2020-08-13
Also published as: CN113382703A; CN113382703B; JP7221715B2; JP2020127539A

Abstract

An absorbent article (1) has an absorbent body (10) and an exterior body (30) that has a ventral waist section (30a) and a dorsal waist section (30b). The exterior body has a first hydrophobic sheet (301), a second hydrophobic sheet (302), and a hydrophilic sheet (303). At least a part of a region of the second hydrophobic sheet (302) is a region (45) having openings. When viewed in the thickness direction, if portions of the hydrophilic sheet (303) overlapping and not overlapping with the region (45) of the second hydrophobic sheet (302) having openings are defined as an overlapping section (50) and a non-overlapping section (51), respectively, the area of the overlapping section (50) is smaller than the area of the non-overlapping section (51).

Description

Absorbent article

The present invention relates to absorbent articles.

⇒ Disposable diapers are known as absorbent articles that absorb excrement such as urine. For example, in Patent Document 1, there is a ventral waist flap and a back waist flap in which elastic regions formed of elastic members are formed, and a hydrophilic sweat-absorbent sheet portion capable of absorbing sweat is arranged in the elastic regions. Disposable diapers are disclosed.

International Publication No. 2018-116479

In the diaper disclosed in Patent Document 1, a hydrophilic sweat absorbing sheet portion that absorbs sweat is provided between the front and rear waist portions of the diaper between the hydrophobic sheets or on the skin side of the wearer to absorb the sweat. In such a case, absorbed sweat may not evaporate sufficiently and may cause skin irritation.

Further, when a cut or the like is further provided on the non-skin side of the diaper in order to improve the evaporation of sweat, the amount of evaporated sweat increases, but the evaporated sweat easily accumulates in the cut and the like, and a part of the drop of water drops. It may become erroneous and may be mistaken for leaks.

The present invention has been made in view of the above conventional problems, the object is to promote the absorption and evaporation of sweat by a hydrophilic sheet and a hydrophobic sheet, water droplets of absorbed sweat An object is to provide an absorbent article that can suppress deterioration.

A main invention for achieving the above object is to have an absorbent main body that has a longitudinal direction, a width direction and a thickness direction that intersect with each other in a deployed state, and that absorbs liquid, and one end of the absorbent main body in the longitudinal direction. An absorptive article having an abdominal waistline portion located on the side, and an exterior body having a backside waistline portion located on the other end side in the longitudinal direction of the absorbent main body, wherein the exterior body is In the thickness direction, a first hydrophobic sheet arranged on the skin side, a second hydrophobic sheet arranged on the non-skin side of the first hydrophobic sheet, the first hydrophobic sheet and the first hydrophobic sheet. A hydrophilic sheet provided between the second hydrophobic sheet and at least a part of the second hydrophobic sheet in at least one of the ventral waistline portion and the back waistline portion of the exterior body. The region is a region having an opening, and when viewed in the thickness direction, a portion of the hydrophilic sheet that overlaps the region having the opening of the second hydrophobic sheet is an overlapping portion, and The area of the overlapping portion is smaller than the area of the non-overlapping portion when the portion that does not overlap with the region having the opening is a non-overlapping portion.
Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

According to the present invention, it is possible to provide an absorbent article capable of suppressing absorption of sweat into water droplets while promoting absorption and evaporation of sweat by the hydrophilic sheet and the hydrophobic sheet.

It is a schematic perspective view of a pants-type disposable diaper 1. FIG. 3 is a schematic plan view of the diaper 1 in a developed and stretched state as seen from the skin side. It is a schematic plan view which looked at the diaper 1 of the expansion|deployment and extension state from the non-skin side. FIG. 3 is a schematic sectional view taken along the line CC in FIG. 2. 5A is a schematic sectional view of the ventral side taken along the line AA in FIG. 3, and FIG. 5B is a schematic sectional view of the back side taken along the line AA in FIG. 6A and 6B are views showing a modification of the opening 40.

At least the following matters will be made clear by the present specification and the description of the accompanying drawings.
An absorptive main body having a longitudinal direction, a width direction and a thickness direction intersecting with each other in a deployed state, absorbing liquid, an abdominal waistline portion located at one end side in the longitudinal direction of the absorbent main body, and An absorbent article having an exterior body having a back waistline portion located on the other end side in the longitudinal direction of the absorbent main body, wherein the exterior body is arranged on the skin side in the thickness direction. A first hydrophobic sheet, a second hydrophobic sheet disposed on the non-skin side of the first hydrophobic sheet, and provided between the first hydrophobic sheet and the second hydrophobic sheet A hydrophilic sheet, and in at least one of the ventral waistline portion and the back waistline portion of the exterior body, at least a partial region of the second hydrophobic sheet is a region having an opening, and When viewed in the thickness direction, a portion of the hydrophilic sheet that overlaps the area having the opening of the second hydrophobic sheet is defined as an overlapping portion, and a portion that does not overlap the area having the opening is not overlapped. In the absorbent article, the area of the overlapping portion is smaller than the area of the non-overlapping portion.

According to such an absorbent article, the sweat of the wearer is absorbed by the hydrophilic sheet through the first hydrophobic sheet, and is evaporated outward through the second hydrophobic sheet. The area having the opening of the second hydrophobic sheet is an area that promotes evaporation of sweat, and the amount of evaporation of sweat is improved at the overlapping portion where the area having the opening and the hydrophilic sheet overlap in the thickness direction. .. Compared with the case where the area of the overlapping portion is larger than the area of the non-overlapping portion that does not overlap with the region having the opening, the case where the area of the overlapping portion is smaller than the area of the non-overlapping portion is more than necessary. No transpiration occurs, water droplets of sweat can be suppressed, and it is possible to prevent clothes from getting wet.

In such an absorbent article, it is preferable that the hydrophilic sheet has only the non-overlapping portion in at least one of the abdominal waistline portion and the back waistline portion of the exterior body.

According to such an absorbent article, it is possible to further suppress the evaporated water as compared with the case where the absorbent article has the overlapping portion, and it is possible to further prevent the clothes from getting wet.

In such an absorbent article, in the abdominal girth part and the back girth part of the exterior body, the hydrophilic sheet has the overlapping part, and of the overlapping part in the abdominal girth part. The area is preferably smaller than the area of the overlapping portion in the back waistline portion.

According to such an absorbent article, more sweat can be absorbed and evaporated on the back side where a large amount of sweat is generated, and skin troubles on the back side of the wearer can be reduced. In addition, by reducing the area of the front side (abdominal side) overlapping portion where a large amount of urine is absorbed, it is possible to suppress the possibility of urine leakage occurring via the abdominal side overlapping portion.

In the absorbent article, the absorbent main body includes an absorbent core, and in the longitudinal direction, from an end of the absorbent core in the abdominal waistline portion to an end of the hydrophilic sheet on the absorbent main body side. Is preferably longer than the distance from the end of the absorbent core in the back waistline portion to the end of the hydrophilic sheet on the absorbent body side.

According to such an absorbent article, since the longitudinal distance from the hydrophilic sheet to the absorbent core is increased on the abdominal side where absorption of urine is large, the urine absorbed by the absorbent core is hydrophilic. It is possible to prevent urine leakage from being transferred to the seat.

In such an absorbent article, it is preferable that the abdominal waistline portion and the back waistline portion include elastic members that expand and contract in the width direction.

According to such an absorbent article, due to the contraction of the elastic member, an appropriate space is created between the first hydrophobic sheet arranged on the skin side and the wearer's skin, and the first hydrophobic sheet is placed on the skin. Air will not easily adhere to each other and air will be easily circulated. This promotes the evaporation of sweat, suppresses the formation of water droplets of sweat, and prevents the clothes from getting wet.

In the absorbent article, the elastic member has a portion that is not joined to the second hydrophobic sheet, and the elastic member is disposed between the hydrophilic sheet and the second hydrophobic sheet. It is desirable to be done.

According to such an absorbent article, when the elastic member is arranged between the hydrophilic sheet and the second hydrophobic sheet and the elastic member is contracted, the second hydrophobic sheet and the elastic member are not joined. In the part, a space is generated in the second hydrophobic sheet. This facilitates air circulation on the non-skin side surface, and promotes evaporation of sweat from the second hydrophobic sheet.

In the absorbent article, a plurality of the elastic members are provided side by side in the longitudinal direction, and the distance between the two elastic members adjacent to each other in the longitudinal direction is the longitudinal direction of the elastic member itself. It is desirable that the length is longer than twice.

According to such an absorbent article, as compared with the case where the distance between two elastic members adjacent to each other in the longitudinal direction is not more than twice the length in the longitudinal direction of the elastic member itself, When the length is longer than twice the length, a proper space can be formed between the elastic members in the longitudinal direction, and the absorption and evaporation of sweat are not hindered by the elastic members.

In the absorbent article, the elastic member has a pair of both end joints joined to the hydrophilic sheet at both ends in the width direction, and the elastic member has the pair of both end joints. It is desirable to have a non-bonded portion that is not bonded to the hydrophilic sheet between the two.

According to such an absorbent article, each elastic member is joined only by the pair of both end joints, and there is no joint between the pair of both end joints, that is, in the central portion or the like that absorbs a lot of sweat. By doing so, it does not hinder the passage of sweat.

In such an absorbent article, it is preferable that the absorbent main body includes an absorbent core, and at least one elastic member is provided between the hydrophilic sheet and the absorbent core.

According to such an absorbent article, the sheet on the skin side of the elastic member is pressed against the wearer's skin due to the contraction of the elastic member between the hydrophilic sheet and the absorbent core. It can block the inflow of urine to. This makes it difficult to cause urine leakage.

In such an absorbent article, it is desirable that at least one elastic member be provided between the hydrophilic sheet and the absorbent body.

According to such an absorbent article, the contraction of the elastic member between the hydrophilic sheet and the absorbent main body presses the sheet on the skin side of the elastic member against the wearer's skin. It can block the inflow of urine to. This makes it difficult to cause urine leakage.

In the absorbent article, the first hydrophobic sheet has a plurality of openings in a region where the first hydrophobic sheet and the hydrophilic sheet overlap with each other when viewed in the thickness direction. Is desirable.

According to such an absorbent article, a larger amount of sweat can be permeated through the opening of the first hydrophobic sheet and absorbed by the hydrophilic sheet. Accordingly, even if a large amount of sweat is sweated at once, the sweat can be quickly absorbed, the surface of the first hydrophobic sheet is less likely to become sticky, and the skin can be kept comfortable.

In such an absorbent article, in a region where the first hydrophobic sheet and the hydrophilic sheet overlap with each other when viewed in the thickness direction, the first hydrophobic sheet has only a non-opening region where no opening is present. It is desirable to have.

According to such an absorbent article, since the opening is not formed in the first hydrophobic sheet, urine is absorbed by the hydrophilic sheet through the opening particularly on the front side (abdominal side) where a large amount of urine is absorbed. Prevent that. This makes it difficult to induce urine leakage through the hydrophilic sheet.

=== Embodiment ===
<Basic configuration of diaper 1>
Hereinafter, as an absorbent article according to the present invention, an embodiment will be described by taking a pants-type disposable diaper (hereinafter, also referred to as “diaper 1”) as an example. 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 the expanded and stretched state as viewed from the skin side, and FIG. 3 is a schematic plan view of the diaper 1 in the expanded and stretched state as viewed from the non-skin side. FIG. 4 is a schematic cross-sectional view taken along the line CC in FIG.

Here, the above-mentioned "unfolded state" refers to both ends of the abdominal waistline portion (abdominal waistline portion 30a described below) and the back waistline portion (backside waistline portion 30b described below) in the width direction of the diaper 1. It is a state in which the diaper 1 is unfolded on a flat surface by releasing the joint with both ends of the diaper and separating the abdominal waistline part and the back waistline part, and opening the diaper 1 in its longitudinal direction. Further, the “extended state” of the diaper 1 is a state in which the entire diaper 1 (whole product) is stretched without wrinkles, specifically, each member constituting the diaper 1 (for example, the absorbent main body 10 described later, It means a state in which the waistline portion 30 and the like) has been stretched until the dimensions become the same as or close to the dimensions of the single member.

Diaper 1 has a vertical direction, a width direction, and a front-back direction that intersect with each other in the pants-type state shown in FIG. The diaper 1 is a so-called three-piece type, and has an absorbent main body 10 that is applied to the crotch of the wearer and absorbs liquid such as excreted liquid, and an exterior body 30 that covers the waist of the wearer. .. The exterior body 30 also includes an abdominal waistline portion 30a that covers the abdominal side and a back waistline portion 30b that covers the backside. The upper side in the vertical direction corresponds to the exterior body 30 side, and the lower side corresponds to the crotch portion side. Also, the front side in the front-rear direction corresponds to the wearer's ventral side, and the back side corresponds to the wearer's back side.

In the unfolded state of FIG. 2, the diaper 1 has a longitudinal direction, a width direction, and a thickness direction that intersect with each other. In the following, one side in the longitudinal direction in this deployed state is also referred to as “abdominal side” or “front side”, and the other side in the longitudinal direction is also referred to as “back side” or “rear side”. The longitudinal direction of the unfolded state is the direction along the vertical direction of the pants-type state. The thickness direction is the direction in which the materials that make up the diaper 1 are stacked, as shown in FIG. The side in contact with the wearer in the thickness direction is the skin side, and the opposite side is the non-skin side.

In the deployed state of FIG. 2, the abdominal waistline portion 30a (front side in the longitudinal direction of the figure) and the back waistline portion 30b (rear side of the longitudinal direction in the figure) are aligned in parallel with each other with a space in the longitudinal direction. While the absorbent main body 10 is hung between these, the longitudinal end portions 10ea and 10eb of the absorbent main body 10 are joined and fixed to the

nearest waist portions

30a and 30b, respectively, and the appearance shape thereof is a plane. It has a substantially H shape as viewed. Then, from this state, the absorbent main body 10 is folded in two with the substantially central portion C10 in the longitudinal direction as the folding position. In this folded state, the abdomen waistline portion 30a and the back waistline portion 30b, which are opposed to each other, are the abdominal waistline side edges 30aes, which are the portions that should contact the wearer's flank, and the back waistline side. When joined and connected to the edge portion 30be (that is, each end portion in the width direction), the

waist portions

30a and 30b are formed into an annular shape. As a result, the diaper 1 in the worn state is formed with the waist opening BH and the pair of leg openings LH as shown in FIG. 1. Further, in the following description, the longitudinal end of the abdominal waistline portion 30a forming the annular opening portion of the opening BH is referred to as the abdominal waistline upper end 30aet, and the back waistline portion 30b forming the annular opening portion of the opening BH is formed. The longitudinal end is the upper back 30g of the waistline.

Hereinafter, the absorbent main body 10, the abdominal waistline portion 30a, and the back waistline portion 30b, which are the three components of the diaper 1, will be described with reference to FIGS. 1 to 4.

<Structure of the absorbent main body 10>
As shown in FIGS. 2 to 4, 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, and both of these. The absorbent core 11 is provided so as to be interposed between the

sheet members

13 and 15. In the diaper 1, the absorbent core 11 has the liquid-permeable core wrap sheet 12, but need not have it.

The absorbent core 11 is a member formed by laminating liquid absorbent materials, and can absorb excrement such as urine. As the liquid absorbent material, for example, liquid absorbent fiber such as pulp fiber can be used. The absorbent core 11 may contain, for example, a superabsorbent polymer as the liquid-absorbent granules, or may contain a liquid-absorbent material other than the liquid-absorbent fibers and the liquid-absorbent granules. Is also good.

The absorbent core 11 of the present embodiment has a ventral side end 11a on one side in the longitudinal direction in FIG. 2 and a back side end 11b on the other side in the longitudinal direction in FIG. Then, between the abdominal end 11a and the dorsal end 11b, there is a constricted portion 11c having a width narrower than that of the abdominal end 11a and the dorsal side end 11b. As a result, the absorbent core 11 is configured to have a substantially hourglass shape in plan view as shown in FIG. 2, and the absorbent core 11 easily fits in the crotch of the wearer. The shape of the absorbent core 11 is not limited to the above-described substantially hourglass shape in plan view, and may be, for example, a substantially rectangular shape in plan view.

The topsheet member 13 is a sheet-shaped member that covers the absorbent core 11 from the skin side, and is, for example, a plane-sized liquid-permeable nonwoven fabric that is larger than the absorbent core 11. The back sheet member 15 is a sheet-shaped member that covers the absorbent core 11 from the non-skin side, and is a sheet having a plane size larger than that of the absorbent core 11. An example of the back sheet member 15 is a sheet having a two-layer structure in which a liquid-impermeable leak-proof sheet 15a such as polyethylene or polypropylene and an exterior sheet 15b such as a non-woven fabric are bonded together. Then, in a state in which the absorbent core 11 is sandwiched between the back sheet member 15 and the top sheet member 13, the leakage preventing sheet 15a of the back sheet member 15 is formed at a portion protruding from the four sides of the absorbent core 11 to the outside. The topsheet member 13 and the topsheet member 13 are bonded together in a frame shape, whereby the absorbent main body 10 is generally formed.

Also, in the diaper 1, as shown in FIGS. 1 to 4, so-called three-dimensional gathers LSG and leg gathers LG are formed by the exterior sheet 15b. The three-dimensional gather LSG is a leak-proof wall portion provided upright at each end of the topsheet member 13 in the width direction, while the leg gathers LG are provided in the leg openings LH, LH of the diaper 1. It is a stretchable part around the leg that is formed. The exterior sheet 15b will be described in detail. First, as shown in FIG. 4, the dimension of the exterior sheet 15b in the width direction is made sufficiently larger than that of the leakproof sheet 15a, that is, the exterior sheet 15b is the leakproof sheet 15a. It largely protrudes in the width direction from both sides in the width direction. Then, this protruding portion 15bf is folded back toward the center in the width direction with the position forming the end portion 10es in the width direction of the absorbent main body 10 as the folding position, and the rubber thread along the longitudinal direction near the folding position. The leg elastic members 17 are fixed in a state of being extended in the longitudinal direction, and thus the leg gathers LG are formed.

The portion 15bg folded back toward the center in the width direction further extends toward the center in the width direction, and is joined to the end of the surface sheet member 13 at a position that covers the end in the width direction. .. Further, a portion on the tip end side in the width direction further than the portion joined to the end portion can stand up from the surface sheet member 13 as a free end portion LSGf. Further, an LSG elastic member 18 such as rubber thread is fixed to the tip of the free end portion LSGf in the longitudinal direction along the longitudinal direction. The free end portion LSGf contracts in the longitudinal direction by the contracting force applied from the LSG elastic member 18 and stands up from the surface sheet member 13, whereby the free end portion LSGf functions as a solid gather LSG.

Although not shown, in some cases, a liquid sheet such as tissue paper may be used as a second sheet between the top sheet member 13 and the absorbent core 11 or between the back sheet member 15 and the absorbent core 11. You may interpose a property sheet.

Further, as shown in FIG. 3, a post-treatment tape 38 may be provided on the non-skin side surface of the back waistline portion 30b. The post-treatment tape 38 is an elongated tape-shaped member having an adhesive surface. When the diaper 1 after use is discarded, the folded post-treatment tape 38 is stretched with respect to the diaper 1 rolled in the longitudinal direction. The adhesive surface side can be wound around the diaper 1 to hold the diaper 1 in a rolled state.

<Structure of ventral waistline portion 30a and dorsal waistline portion 30b>
As shown in FIG. 2, the abdominal 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 in the longitudinal direction of the absorbent main body 10. It is located on the rear side (the other end side). 5A is a schematic cross-sectional view of the ventral side taken along the line AA in FIG. 3, and FIG. 5B is a schematic cross-sectional view of the back side taken along the line AA in FIG.

As shown in FIG. 5A and FIG. 5B, the abdominal waistline portion 30a and the back waistline portion 30b of the exterior body 30 respectively have a first hydrophobic sheet 301 and a first hydrophobic sheet 301 arranged on the skin side in the thickness direction. The second hydrophobic sheet 302 is arranged on the non-skin side of the hydrophilic sheet 301, and the hydrophilic sheet 303 provided between the first hydrophobic sheet 301 and the second hydrophobic sheet 302. The first hydrophobic sheet 301 is a hydrophobic sheet composed of hydrophobic fibers, and allows sweat of the wearer to pass through. The hydrophilic sheet 303 is a hydrophilic sheet that can absorb sweat, and as an example, a sheet member coated with a hydrophilizing agent may be used in addition to a pulp sheet, a tissue, or the like. The second hydrophobic sheet 302 is a hydrophobic sheet composed of hydrophobic fibers similar to the first hydrophobic sheet 301, and is disposed on the non-skin side of the hydrophilic sheet 303, so that the sweat Promotes transpiration.

Here, the term "hydrophobic" means that the 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 are 90°. Means having a larger contact angle. The contact angle means the contour curve of the liquid in a state where the first and second

hydrophobic sheets

301 and 302 having a horizontal surface (horizontal surface) and the water (droplets) dropped on the horizontal surface are in contact with each other. Is the angle formed by the tangent line of the contour curve at the intersection of the horizontal plane and the horizontal plane. The contact angle of each of the first and second

hydrophobic sheets

301 and 302 is greater than 90° and has a hydrophobic surface. On the other hand, if the contact angle is smaller than 90°, it is determined that the hydrophilicity is high and the hydrophilic sheet 303 has a surface whose contact angle is smaller than 90°.

As shown in FIGS. 2, 5A, and 5B, the second hydrophobic sheet 302 extends upward in the vertical direction from the abdominal waistline upper end 30aet and the back waistline upper end 30bet, and the abdominal waistline upper end. 30aet and the back side waistline upper end 30bet are respectively set as folding positions, and a folding back portion 302F is folded back to the skin facing surface side of the first hydrophobic sheet 301 along the peripheral edge of the waistline opening BH. In the present embodiment, the folded-back portion 302F covers the front end and the rear end in the longitudinal direction of the absorbent main body 10, but the folded-back portion 302F may be shortened so as not to cover.

As described above, by providing the hydrophilic sheet 303 between the first hydrophobic sheet 301 and the second hydrophobic sheet 302, first, the perspiration from the wearer's skin is absorbed by the second hydrophobic sheet 302. It passes through the folded-back portion 302F, passes through the first hydrophobic sheet 301, and is absorbed by the hydrophilic sheet 303. Then, the absorbed sweat is further evaporated through the second hydrophobic sheet 302 located on the non-skin side.

Further, in at least one of the abdominal waistline portion 30a and the back waistline portion 30b, at least a partial region of the second hydrophobic sheet 302 is a region 45 having an opening including the opening 40 as shown in FIG. Is desirable. The opening 40 is provided in order to enhance the air permeability of the diaper 1, and may be an opening having a round shape, an elliptical shape, a square shape, or the like, or a notch for cutting a sheet member or the like.

The term “area having an opening” here means a rectangular area that is in contact with a plurality of openings from the outside. In the present embodiment, an example of the region 45 having an opening is shown in FIG. In FIG. 3, a plurality of openings 40 are provided along the up-down direction in the vicinity of the center in the width direction of the abdominal waistline portion 30a and the back waistline portion 30b of the second hydrophobic sheet 302. Are provided side by side in two rows. A region surrounded by a rectangular shape so as to contact the plurality of openings 40 in each row from the outside is referred to as “a region 45 having an opening”. The area 45 having an opening may have at least one opening. Further, although the openings 40 are provided in a plurality of rows in the present embodiment, they may be provided in a row.

Further, when forming the opening 40 of the present embodiment, the belly-side elastic member 35a and the back-side elastic member 35b, which will be described later, are cut, and in the region 45 having the opening, the

elastic members

35a and 35b are discontinuous. ing. Therefore, in the region 45 having the opening, the ventral waistline portion 30a and the back waistline portion 30b are less likely to contract in the width direction. Therefore, wrinkles are less likely to occur on the absorbent core 11.

As described above, the air permeability of the diaper 1 is improved by providing the second hydrophobic sheet 302, which is the most non-skin side, with the openings 40 for enhancing the air permeability, but the openings 40 are hydrophilic when viewed in the thickness direction. When the sheet is formed so as to overlap with the sheet, the evaporated sweat may be guided to the opening 40 and part of the sweat may be dropped to wet the wearer's clothing.

Therefore, in the present embodiment, when the area 45 having the opening is viewed in the thickness direction (FIG. 3 ), a portion of the hydrophilic sheet 303 that overlaps the area 45 having the opening of the second hydrophobic sheet 302. Is the overlapping portion 50, and the portion that does not overlap the region 45 having the opening is the non-overlapping portion 51, the area of the overlapping portion 50 is smaller than the area of the non-overlapping portion 51 (the back side of FIG. 3). See waistline 30b). In FIG. 3, in order to make the position of the hydrophilic sheet 303 easy to understand, the hydrophilic sheet 303 is shown in a dot pattern in the abdominal waistline portion 30a and the back waistline portion 30b. Further, FIG. 5B shows in detail the overlap (so-called overlapping portion 50) of the hydrophilic sheet 303 and the region 45 having the opening in the vertical direction. In the present embodiment, since the regions 45 having the openings are provided in two rows on the back waistline portion 30b, two overlapping portions 50 of the hydrophilicity 303 that overlap the regions 45 having the openings are provided. Therefore, the area of the overlapping portion 50 of the present embodiment means the total area of the two overlapping portions 50.

With such a configuration, the amount of perspiration of sweat is improved in the overlapping portion 50 overlapping the area 45 having the opening, but the area of the overlapping portion 50 is larger than the area of the non-overlapping portion 51 not overlapping the area 45 having the opening. When the area of the overlapping portion 50 is smaller than the area of the non-overlapping portion 51, the evaporation of sweat does not occur more than necessary and the formation of water droplets can be suppressed as compared with the case where the overlapping portion 50 is increased. This can prevent the wearer's clothes from getting wet.

Further, it is desirable that the hydrophilic sheet 303 has only the non-overlapping portion 51 in at least one of the abdominal waistline portion 30a and the back waistline portion 30b. In the present embodiment, the overlapping portion 50 is provided on the hydrophilic sheet 303 of the back waistline portion 30b, and the hydrophilic sheet 303 of the abdominal waistline portion 30a does not include the overlapping portion and has only the non-overlapping portion 51. .. Like the abdominal waistline portion 30a, the opening 40 is provided so as not to overlap the hydrophilic sheet 303 when viewed in the thickness direction, so that the amount of sweat evaporated can be further increased as compared with the case where the overlapping portion 50 is provided. It is possible to suppress, and it is possible to prevent sweat from becoming water droplets and make it difficult for the clothes to get wet.

In the present embodiment, the hydrophilic sheet 303 has the overlapping portion 50 in at least one of the waistline portions 30 (dorsal waistline portion 30b), but in both the abdominal waistline portion 30a and the back waistline portion 30b. The hydrophilic sheet 303 may be provided with the overlapping portion 50. In that case, the area of the overlapping portion 50 (not shown) in the abdominal waistline portion 30a is preferably smaller than the area of the overlapping portion 50 in the back waistline portion 30b. By doing so, it is possible to absorb and evaporate more sweat on the back side with a large amount of sweat, and reduce skin troubles on the back side of the wearer. Further, by reducing the area of the front side (abdominal side) overlapping portion 50 that absorbs a large amount of urine, it is possible to prevent urine from being guided by the hydrophilic sheet 303 and leaking from the overlapping portion 50.

Further, as shown in FIG. 2, in the longitudinal direction, the distance from the end 11a (abdominal end 11a) of the absorbent core 11 in the abdominal waistline portion 30a to the end 303ae of the hydrophilic sheet 303 on the absorbent main body 10 side ( S1) is longer than the distance (S2) from the end 11b (back side end 11b) of the absorbent core 11 in the back waistline portion 30b to the end 303be of the hydrophilic sheet 303 on the absorbent body 10 side. By increasing the longitudinal distance (S1) from the hydrophilic sheet 303 to the absorbent core 11 on the ventral side where much urine is absorbed, the urine absorbed by the absorbent core 11 is transferred to the hydrophilic sheet 303. It is possible to prevent the leakage of urine.

Further, as shown in FIG. 2, the abdominal waistline portion 30a and the back side waistline portion 30b have elastic members 35 such as rubber threads that expand and contract in the width direction. Specifically, the plurality of

elastic members

35, 35... Are arranged in a state of being extended in the width direction along the width direction. The plurality of

elastic members

35, 35,... Are provided side by side in the longitudinal direction at intervals in the longitudinal direction. In this specification, the elastic member 35 provided on the abdominal waistline portion 30a is referred to as an abdominal elastic member 35a, and the elastic member 35 provided on the back side waistline portion 30b is referred to as a back elastic member 35b.

The abdominal elastic member 35a and the dorsal elastic member 35b provide stretchability in the width direction, and the

elastic members

35a and 35b contract, so that the first hydrophobic sheet 301 (and the folded portion 302F) on the skin side. There is an appropriate space between the skin and the wearer's skin. As a result, the first hydrophobic sheet 301 does not adhere to the skin too much, and air circulation is likely to occur. As a result, the evaporation of sweat is promoted and the sweat is prevented from becoming water droplets.

Further, the elastic member 35 (the belly elastic member 35 a and the back elastic member 35 b) is arranged between the hydrophilic sheet 303 and the second hydrophobic sheet 302, and the elastic member 35 is the second hydrophobic sheet 302. It is desirable to have a portion that is not joined with. Thereby, when each elastic member 35 is contracted, a space is generated in the second hydrophobic sheet 302 in a portion where the second hydrophobic sheet 302 and each elastic member 35 are not joined. As a result, air is likely to circulate on the non-skin side surface of the diaper 1 on which the second hydrophobic sheet 302 is arranged, which promotes evaporation of sweat from the second hydrophobic sheet 302.

In addition, as shown in FIG. 2, the abdominal elastic member 35a disposed between the hydrophilic sheet 303 and the second hydrophobic sheet 302 includes the abdominal waistline side edges 30aes, which are both ends in the width direction, 30 aes has a pair of both end joints 60 joined to the hydrophilic sheet 303. Similarly, the back elastic member 35b arranged between the hydrophilic sheet 303 and the second hydrophobic sheet 302 is also a hydrophilic sheet at the back waistline side edges 30bes and 30bes which are both ends in the width direction. It has a pair of both end joints 60 joined to 303. Bonding with the hydrophilic sheet 303 is performed using, for example, a hot melt adhesive or the like. Each of the abdominal elastic members 35a and the back elastic members 35b having the pair of both end joints 60 has the non-joint portion 61 not joined to the hydrophilic sheet 303 between the pair of both end joints 60. That is, the

elastic members

35a and 35b arranged between the hydrophilic sheet 303 and the second hydrophobic sheet 302 are joined only by the pair of both end joints 60, that is, between the pair of both end joints 60, that is, many In the region including the vicinity of the center in the width direction that absorbs the sweat, the non-joined portion 61 does not have a joined portion. In the non-bonding portion 61, since there is no factor such as the hot-melt adhesive that easily inhibits the evaporation of sweat, the evaporation of sweat is promoted and it is possible to make the wearer less uncomfortable.

Further, in the plurality of elastic members 35 (35a, 35b) provided side by side in the longitudinal direction, as shown as an example in FIG. 5A, between the two

elastic members

35a, 35a adjacent in the longitudinal direction (vertical direction). It is desirable that the distance (L2) be longer than twice the length (L1) in the vertical direction (longitudinal direction) of one elastic member 35a itself. According to such a configuration, the distance (L2) between the two elastic members 35a adjacent to each other in the longitudinal direction (L2) is not more than twice the longitudinal length (L1) of the elastic member 35a itself. In comparison, when the elastic member 35a is made longer than twice the length (L1) in the longitudinal direction, an appropriate space is formed between the

elastic members

35a and 35a in the longitudinal direction, and each elastic member 35a sweats. It does not hinder the absorption and transpiration of the soybeans and makes it easier to sweat.

It is desirable that at least one elastic member 35 be provided between the hydrophilic sheet 303 and the absorbent core 11 (FIG. 5A). In the abdominal waistline portion 30a of the present embodiment, elastic members 35a' and 35a'' are provided between the hydrophilic sheet 303 and the absorbent core 11. The contraction of these elastic members 35a′ and 35a″ presses the first hydrophobic sheet 301 and the folded-back portion 302F, which are on the skin side of the elastic members 35a′ and 35a″, against the wearer's skin. The inflow of urine to the 303 side can be blocked. This prevents urine leakage from occurring through the hydrophilic sheet 303.

Similarly, it is desirable that at least one elastic member 35 be provided between the hydrophilic sheet 303 and the absorbent body 10. In the present embodiment, not only the absorbent core 11, but also the core wrap sheet 12 that covers the absorbent core, the absorbent main body 10 including the topsheet member 13 and the backsheet member 15, and the hydrophilic sheet 303 are elastic. A member 35 (as an example, the elastic members 35a' and 35a'' in FIG. 5) is present. Due to the contraction of the elastic member 35, the first hydrophobic sheet 301 and the folded-back portion 302F on the skin side of the elastic member 35 are pressed against the wearer's skin, so that the urine from the absorbent main body 10 to the hydrophilic sheet 303 side Inflow can be suppressed. This prevents urine leakage from occurring through the hydrophilic sheet 303.

Further, in a region where the first hydrophobic sheet 301 and the hydrophilic sheet 303 overlap each other when viewed in the thickness direction as shown in FIGS. 5A and 5B, the first hydrophobic sheet 301 has a plurality of openings (not shown). ) Is desirable. The above-mentioned "region overlapping in the thickness direction" means a portion where the hydrophilic sheet 303 is arranged in the abdominal waistline portion 30a and the back waistline portion 30b in FIG. 2 when viewed in the thickness direction. It means a region overlapping with (the region of the hydrophilic sheet 303 shown by a dot pattern). In the region, when the first hydrophobic sheet 301 has an opening, more sweat is drawn in from the opening portion, and the transferability of sweat to the hydrophilic sheet 303 side is improved. Thereby, even if a large amount of sweat is swept at one time, it is quickly absorbed, the surface of the first hydrophobic sheet 301 is less likely to become sticky, and the skin can be kept comfortable.

However, in the region where the first hydrophobic sheet 301 and the hydrophilic sheet 303 overlap each other as seen in FIGS. 5A and 5B when viewed in the thickness direction, the first hydrophobic sheet 301 has a non-opened state in which no opening is present. It may have only a region (not shown). By not forming an opening in the first hydrophobic sheet 301, urine is prevented from passing through the opening and being absorbed by the hydrophilic sheet 303, particularly on the front side (abdominal side) where a large amount of urine is absorbed. This makes it difficult for urine to leak through the hydrophilic sheet.
=== Other Embodiments ===

Although the embodiments of the present invention have been described above, the above embodiments are for the purpose of facilitating the understanding of the present invention and not for limiting the interpretation of the present invention. Further, it is needless to say that the present invention can be modified or improved without departing from the gist thereof and that the present invention includes equivalents thereof.

In the above embodiment, the pants-type disposable diaper 1 is illustrated as an example of the absorbent article, but the absorbent article is not limited to this. For example, a tape-type disposable diaper may be used. As the pants-type disposable diaper 1, a so-called three-piece type diaper in which the absorbent main body 10 is stretched between the abdominal waistline portion 30a and the back waistline portion 30b in the unfolded state is illustrated. In the state, a so-called two-piece type diaper in which the absorbent main body is placed on the skin side of the substantially hourglass-shaped exterior sheet may be used.

In the above-described embodiment, as shown in FIGS. 5A and 5B, in the abdominal waistline portion 30a and the dorsal side waistline portion 30b, the second hydrophobic sheet 302 has the abdominal waistline upper end 30aet and the back waistline upper end 30bet. Although the folded-back portion 302F has the folded-back portions 302F as the folding-back positions, it may be configured not to be folded back. That is, the upper and lower ends of the second hydrophobic sheet 302 may end at the same position as the upper and lower ends of the first hydrophobic sheet 301. In that case, regions having only the first hydrophobic sheet 301, the second hydrophobic sheet 302, and the hydrophilic sheet 303 are formed on the abdominal waistline portion 30a and the back waistline portion 30b of the exterior body 30. In such a region, sweat absorbability and sweat evaporation function are most enhanced, stickiness on the skin side surface is suppressed, and sweat is easily evaporated from the non-skin side surface.

A plurality of openings 40 are provided in the vertical direction in the widthwise central portions of the ventral waistline portion 30a and the back waistline portion 30b of the second hydrophobic sheet 302, but the invention is not limited thereto. 6A and 6B are views showing a modification of the opening 40. As shown in FIG. 6A, the openings 40 may be arranged, for example, along the up-down direction of the second hydrophobic sheet 302 of the outer package 30, and may be provided in a plurality of rows in the width direction over the entire outer package 30. .. This not only improves the air permeability of the diaper 1, but also in the hydrophilic sheet 303, by making the area of the overlapping portion 50 smaller than the area of the non-overlapping portion 51, it is possible to prevent the sweat from being evaporated more than necessary. , Can improve breathability. Further, as shown in FIG. 6B, the openings 40 may be provided, for example, only on both end sides in the width direction. As long as the opening 40 is arranged so that the area of the overlapping portion 50 of the hydrophilic sheet 303 is smaller than the area of the non-overlapping portion 51, not only the position of FIG. Can be formed.

1 diapers (absorbent articles),
10 Absorbent body, 10ea end, 10eb end, 10es end,
13 front sheet member, 15 back sheet member, 15bg folded back portion,
11 absorbent core, 11a ventral end, 11b dorsal end,
11c constriction,
12 core wrap sheets,
15a leak-proof sheet, 15b exterior sheet,
17 Elastic members around legs,
18 LSG elastic member 30 Exterior body, 30a Ventral girth part, 30b Dorsal girth part,
30aes ventral waistline side edge, 30bes dorsal waistline side edge,
30aet ventral waistline upper end, 30bet dorsal waistline upper end,
35 elastic member, 35a ventral elastic member, 35a' elastic member,
35a'' elastic member, 35b back elastic member,
38 Post-processing tape,
A region having 40 openings, 45 openings,
50 overlapping portion, 51 non-overlapping portion 60 both ends joint portion, 61 non-joining portion,
301 First hydrophobic sheet,
302 second hydrophobic sheet, 302F folded-back portions 302, 302a skin side surface,
303 hydrophilic sheet, 303a non-skin side, 303ae edge, 303be edge,
C10 Approximately central part LH Leg opening, BH Body opening,
LSG three-dimensional gather, LSGf free end part

Claims

Has a longitudinal direction, a width direction, and a thickness direction that intersect with each other in the deployed state,
An absorbent body that absorbs liquid,
An exterior body having an abdominal waistline portion located on one end side in the longitudinal direction of the absorbent main body, and a back side waistline portion located on the other end side in the longitudinal direction of the absorbent main body,
An absorbent article having:
The exterior body includes a first hydrophobic sheet arranged on the skin side, a second hydrophobic sheet arranged on the non-skin side of the first hydrophobic sheet, and the first hydrophobic sheet in the thickness direction. A hydrophilic sheet and a hydrophilic sheet provided between the second hydrophobic sheet,
At least one of the ventral waistline portion and the back waistline portion of the exterior body, at least a part of the region of the second hydrophobic sheet is a region having an opening,
When viewed in the thickness direction, a portion of the hydrophilic sheet that overlaps the region having the opening of the second hydrophobic sheet is an overlapping portion, and a portion that does not overlap the region having the opening is a non-overlap portion. When it is an overlapping part,
The area of the overlapping portion is smaller than the area of the non-overlapping portion.
The absorbent article according to claim 1,
The absorbent article, wherein the hydrophilic sheet has only the non-overlapping portion in at least one of the ventral waistline portion and the back waistline portion of the exterior body.
The absorbent article according to claim 1 or 2, wherein
In the ventral side waistline portion and the back side waistline portion of the exterior body, the hydrophilic sheet has the overlapping portion,
The area of the overlapping portion in the abdominal waistline portion is smaller than the area of the overlapping portion in the back waistline portion.
The absorbent article according to any one of claims 1 to 3, wherein:
The absorbent body includes an absorbent core,
In the longitudinal direction, the distance from the end of the absorbent core in the ventral waistline portion to the end of the hydrophilic sheet on the side of the absorbent main body is the hydrophilicity from the end of the absorbent core in the back waistline portion. An absorbent article, which is longer than a distance to an end of the absorbent sheet on the side of the absorbent main body.
The absorbent article according to any one of claims 1 to 4, wherein:
The abdominal waistline portion and the back waistline portion include elastic members that expand and contract in the width direction.
The absorbent article according to claim 5, wherein
The elastic member has a portion that is not joined to the second hydrophobic sheet,
The said elastic member is arrange|positioned between the said hydrophilic sheet and the said 2nd hydrophobic sheet, The absorbent article characterized by the above-mentioned.
The absorbent article according to claim 5 or 6, wherein:
A plurality of the elastic members are provided side by side in the longitudinal direction,
The absorbent article, wherein the distance between two elastic members adjacent to each other in the longitudinal direction is longer than twice the length of the elastic member itself in the longitudinal direction.
The absorbent article according to any one of claims 5 to 7, wherein:
The elastic member has a pair of both end joints joined to the hydrophilic sheet at both end portions in the width direction,
The said elastic member has a non-bonding part which is not bonded to the said hydrophilic sheet between the said pair of both end bonding parts, The absorbent article characterized by the above-mentioned.
The absorbent article according to any one of claims 5 to 8, wherein:
The absorbent body includes an absorbent core,
At least one said elastic member is provided between the said hydrophilic sheet and the said absorbent core, The absorbent article characterized by the above-mentioned.
The absorbent article according to any one of claims 5 to 9, wherein:
At least one said elastic member is provided between the said hydrophilic sheet and the said absorptive main body, The absorbent article characterized by the above-mentioned.
The absorbent article according to any one of claims 1 to 10, wherein:
The absorbent article, wherein the first hydrophobic sheet has a plurality of openings in a region where the first hydrophobic sheet and the hydrophilic sheet overlap with each other when viewed in the thickness direction.
The absorbent article according to any one of claims 1 to 10, wherein:
In a region where the first hydrophobic sheet and the hydrophilic sheet overlap each other when viewed in the thickness direction, the first hydrophobic sheet has only a non-opening region where no opening exists. Absorbent article.