JP2018140066A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article comprising an inside gathering on inside of a leg gathering, capable of suppressing generation of lateral leakage.SOLUTION: An absorbent article comprises: an absorber 12; and skin surface side sheets 10, 11 and non-skin surface side sheets 13, 14 for covering the absorber 12, and in which a longitudinal direction is along a cross direction of a crotch in wearing of the absorbent article. The absorber 12 is arranged on a region except for both edge parts 1S on outside of a width direction and comprises: leg gatherings 31 each of which is arranged on a region including each of both edge parts 1S, and is formed by a first elastic member 41 exhibiting shrinkage force in a longitudinal direction; and inside gatherings 32 each of which is arranged near inside of the width direction relative to the leg gatherings 31, and is formed by a second elastic member 42 exhibiting shrinkage force in the longitudinal direction, in which the first elastic member 41 has an elastic modulus higher than that of the second elastic member 42.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article such as a disposable diaper.

Conventionally, an absorbent article is provided with an absorbent body extending in the longitudinal direction connecting the wearer's abdomen and back, and liquid excretion such as excreted urine and menstrual blood is absorbed into the absorbent article. .
However, if the absorbent body is irregularly bent or twisted, the feel of the wearer and the liquid absorbability may be lowered, and the wearer's comfort may not be ensured. For example, since the site | part arrange | positioned in a wearer's inseam in an absorber is a main site | part from which a liquid is excreted, it should stick | wear to a wearer and should be mounted | worn.

Therefore, a technique has been developed for holding the absorbent body in a predetermined shape in a state where the absorbent article is attached to the wearer.
For example, Patent Document 1 includes a top sheet disposed on the skin surface side, a back sheet disposed on the non-skin surface side, and an absorbent body disposed between both sheets, and is formed in a vertically long shape. An absorbent article (paper diaper) having solid gathers, leg gathers, and absorbent gathers, both of which are formed by elastic members extending in the longitudinal direction on both sides, is disclosed.

The three-dimensional gather is arranged on the skin surface side so as to rise toward the wearer's skin side. The leg gathers are arranged on the outermost side, and the absorber gathers are arranged at positions facing the three-dimensional gathers with the absorber sandwiched inside the leg gathers. Moreover, an absorber gather is arrange | positioned at the non-skin surface side of an absorber.
Due to the shrinkage or the like of these gathers by the elastic member, the absorbent article is naturally formed into a three-dimensional shape, improving the fit to the wearer and improving the absorbability.

Japanese Patent Laying-Open No. 2015-66308

  By the way, the absorber gathers provided inside the leg gathers (hereinafter referred to as inner gathers) are effective for bringing the absorber into close contact with the body. Moreover, the so-called lateral leakage, in which liquid excrement leaks out from the edge of the paper diaper in the width direction (the part where the leg gathers are formed), is to be suppressed in cooperation with the leg gathers and the inner gathers. I can expect. However, this is not sufficient to suppress the occurrence of such side leakage, and further development of technology for suppressing the occurrence of side leakage is expected.

The present invention was devised in view of such a problem, and an object of the present invention is to make it possible to suppress the occurrence of side leakage in an absorbent article in which an inner gather is provided inside a leg gather. I am trying.
It should be noted that the present invention is not limited to the purpose described above, and is an operation and effect derived from each configuration shown in the `` Mode for Carrying Out the Invention '' described later, and can also exhibit an operation and an effect that cannot be obtained by conventional techniques. It can be positioned as another purpose of this case.

(1) In order to achieve the above object, an absorbent article of the present invention includes an absorbent body, a skin-side sheet that covers the absorbent body from the skin surface side, and a non-cover that covers the absorbent body from the non-skin surface side. The absorbent article is attached to a crotch of a wearer so that a longitudinal direction thereof is along the front-rear direction of the crotch, and the absorbent body has a width direction intersecting with the longitudinal direction. Than the leg gathers, which are arranged except for both outer edge portions of the first gathering member and are formed in a region including both the edge portions and formed by a first elastic member that exerts a contracting force in the longitudinal direction. An inner gather formed by a second elastic member that is disposed closer to the inner side in the width direction and that exerts a contracting force in the longitudinal direction, the first elastic member being more than the second elastic member. Has a high elastic modulus. There.
In addition, when an elastic member is comprised by several linear elastic bodies, what combined the elastic modulus of several linear elastic bodies becomes the elastic modulus of an elastic member.

  (2) It is preferable that the position of the inner gather in the width direction is set so as to correspond to both edges in the width direction of the absorber.

  (3) The second elastic member is configured by a plurality of second linear elastic bodies that are parallel to each other and extend in the longitudinal direction, and the plurality of second linear elastic bodies are more than the inner one in the width direction. The outer one preferably has a higher elastic modulus.

  (4) The first elastic member is configured by a plurality of first linear elastic bodies that are parallel to each other and extend in the longitudinal direction, and the plurality of first linear elastic bodies is more than the inner one in the width direction. The outer one preferably has a higher elastic modulus.

  (5) The first elastic member is composed of one or more first linear elastic bodies that are parallel to each other and extend in the longitudinal direction, and the second elastic members are parallel to each other and extend in the longitudinal direction. It is preferable that the number of the second linear elastic bodies is larger than the number of the first linear elastic bodies.

(6) It is preferable that the entire effective range of the second elastic member is disposed in a region overlapping with the absorber in the thickness direction.
(7) It is preferable that a groove-like portion extending in the longitudinal direction is formed closer to the inner side in the width direction than the inner gathers of the absorber.

  (8) The non-skin side sheet includes a back sheet and a cover sheet that are arranged in a layered order from the side close to the absorber, and the second elastic member includes the back sheet and the cover sheet. It is preferable that the inner gathers are formed by the back sheet and the cover sheet which receive contraction force by the second elastic member.

  (9) The first elastic member is disposed between the skin surface side sheet and the cover sheet, and the leg gather receives the contraction force by the first elastic member and the cover. It is preferable to form with a sheet | seat.

  (10) A solid formed three-dimensionally from the skin surface side sheet toward the skin surface side by a third elastic member that exhibits contraction force in the longitudinal direction adjacent to both edges in the width direction of the absorber. It is preferable to further have a gather.

  (11) The skin side sheet is a top sheet disposed so as to overlap the entire surface of the absorbent body or a region excluding both side edges in the width direction, and a side sheet disposed on the outer side in the width direction than the top sheet. And an inner extending portion that is detachable from the skin surface side sheet to the skin surface side on the inner side in the width direction of the side sheet, and the three-dimensional gather is in the inner extending portion. It is preferable to be provided.

  According to the present invention, even if excrement enters between the leg gather and the inner gather, it becomes easy to move to the inner absorbent body side, and the leakage of excrement to the outside of the absorbent article can be suppressed. it can.

It is a top view of the paper diaper (absorbent article) of an unfolded state. It is a perspective view which decomposes | disassembles and shows the paper diaper of FIG. It is principal part sectional drawing (alpha-alpha sectional drawing of FIG. 1) of the paper diaper of FIG. It is principal part sectional drawing of the paper diaper of a mounting state, (a) shows the swelling between embossed parts, (b) shows an example of the cross section of a paper diaper in a mounting state.

  Hereinafter, an absorbent article as an embodiment will be described with reference to the drawings. Note that the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described in the following embodiment. Each configuration of the present embodiment can be implemented with various modifications without departing from the spirit thereof. Further, they can be selected as necessary, or can be appropriately combined.

  The absorbent article of this embodiment is a sanitary article that is worn by a wearer and absorbs liquid such as urine and menstrual blood. Examples of the absorbent article include tape-type and pants-type paper diapers (so-called “disposable diapers”), urine pads, sanitary napkins, panty liners, and the like. In the following embodiment, a tape-type paper diaper is illustrated as an absorbent article.

  In this embodiment, about a paper diaper, let the direction which connects the front body arrange | positioned facing a wearer's abdomen and the back body arrange | positioned facing a back part be a longitudinal direction. Inseam placed between the front body (one side in the longitudinal direction) and the back body (the other side in the longitudinal direction) (center in the longitudinal direction) is placed on the wearer's crotch (placed opposite the crotch) The part is located. Further, in a state where a paper diaper is worn by the wearer (hereinafter abbreviated as “wearing state”), the side facing the wearer's skin (inside when worn) is the skin side, and the opposite side of the skin side (Outside when worn) is the non-skin side. Furthermore, a direction connecting the skin surface side and the non-skin surface side is a thickness direction, and a direction orthogonal to both the longitudinal direction and the thickness direction is a width direction. In addition, viewing from the thickness direction is a plan view.

[I. One Embodiment]
[1. Paper diaper]
[1-1. Basic configuration]
First, with reference to FIG.1 and FIG.2, the basic structure of the paper diaper 1 is demonstrated. The paper diaper 1 is formed symmetrically with respect to the center line C in the width direction. In addition, in FIG. 2, about the code | symbol which shows the center line of the width direction in each member, the code | symbol which shows each member is added by subscript to code | symbol "C".
The paper diaper 1 is roughly divided into three regions along the longitudinal direction: a front body 1A, a crotch 1B, and a back body 1C.

The paper diaper 1 is provided with a fastening tape 2 protruding in the width direction at the back body 1C, and a front patch 3 (shown by a broken line in FIG. 1) on the most non-skin surface side of the front body 1A. The paper diaper 1 is mounted on the wearer by the fastening tape 2 being fastened to the front patch 3.
Moreover, the width direction dimension of the crotch part 1B is set to be slightly larger than the dimension between the bases of both legs of a general wearer. Therefore, in the mounted state, the crotch part 1B sandwiched in the width direction is bent. In this state, the fold extends in the longitudinal direction.

Next, sheets constituting the disposable diaper 1 will be described with reference to FIGS.
The paper diaper 1 is provided with an absorbent body 12 (indicated by a thick broken line in FIG. 1) extending in the longitudinal direction over the front body 1A, the crotch 1B, and the back body 1C. 1 and 2, the crotch part 1B has a smaller size in the width direction than the front body 1A and the back body 1C, that is, the absorbent body 12 in a front view shape in which both edges in the width direction are curled at the crotch part 1B. Illustrate. However, you may use the absorber 12 with a fixed width direction dimension.

The absorber 12 is a member that absorbs and holds liquid excreted from the wearer. Since the absorbent body 12 has a mat shape in this example, it will be referred to as “mat 12” in the following description. However, the shape of the absorbent body is not limited to the mat shape, and various shapes known in the art. Things can be adopted.
For example, a core in which a superabsorbent polymer (so-called SAP <Superabsorbent polymer>, also referred to as a superabsorbent polymer or superabsorbent polymer) is mixed with pulverized or defibrated pulp (so-called “fluff pulp”). What is encapsulated (wrapped) with a wrap sheet (core wrap) is used for the mat 12. Here, a tissue is used for the wrap sheet.

Various sheets described below are laminated on the skin surface side and the non-skin surface side with respect to the mat 12.
On the skin surface side of the mat 12, a top sheet 11 as one of the skin surface side sheets is arranged and laminated so as to overlap a wide area excluding both side edges (ear portions) in the width direction of the mat 12. The top sheet 11 may cover the entire area of the mat 12.
The top sheet 11 is disposed on the most skin side in the paper diaper 1. The top sheet 11 has a property (liquid permeability) that allows the liquid to pass through in order for the mat 12 to absorb the liquid excreted from the wearer. The top sheet 11 covers the skin surface side of the mat 12.

Furthermore, the side sheet | seat 10 is provided in each of the width direction side with respect to the top sheet | seat 11 and the mat | matte 12 as one of the skin surface side sheets.
As with the top sheet 11, the side sheet 10 is disposed on the most skin side in the disposable diaper 1. The side sheet 10 has a property (hydrophobicity) that makes it difficult for the liquid to permeate in order to prevent leakage of the excreted liquid.

A back sheet (first non-skin side sheet) 13 is laminated on the non-skin side of the mat 12 as one of the non-skin side sheets on the side close to the mat 12. A cover sheet (second non-skin side sheet) 14 is laminated as one of the non-skin side sheets on the non-skin side of the back sheet 13 (the side far from the mat 12).
The back sheet 13 has liquid impermeability in order to prevent liquid leakage from the mat 12. The back sheet 13 covers the mat 12 from the non-skin surface side. For example, a thermoplastic resin sheet such as polyethylene (PE) or polypropylene (PP) is used for the back sheet 13.

As shown in FIG.1 and FIG.2, the cover sheet | seat 14 is arrange | positioned most on the non-skin surface side in the crotch part 1B and the back body 1C of the paper diaper 1. FIG. The cover sheet 14 is provided to reinforce the back sheet 13 and improve the tactile sensation (for example, touch), and covers the back sheet 13 from the non-skin surface side.
The cover sheet 14 is not limited to a single layer structure, and may be a multilayer structure including an inner cover sheet and an outer cover sheet.

  The mat 12 is disposed except for both edge portions 1S on the outer side in the width direction of the paper diaper 1. In other words, the mat 12 and the top sheet 11 are not disposed at both edge portions 1S on the outer side in the width direction of the paper diaper 1, and only the side sheet 10, the back sheet 13, and the cover sheet 14 are disposed so as to overlap each other. In addition, the back sheet 13 is not disposed on the outermost sides of both edge portions 1S on the outer side in the width direction, and only the side sheet 10 and the cover sheet 14 are disposed so as to overlap each other.

  Moreover, the front view shape of each width direction both edge part of the side sheet | seat 10, the back sheet | seat 13, and the cover sheet | seat 14 is a shape beaten by the crotch part 1B similarly to the width direction both edge part of the mat | matte 12. . However, the mat 12 and the sheets 10, 13, and 14 are not limited to the shape that is wound in this way, and may be rectangular. Both widthwise edges of the side sheet 10 and the cover sheet 14 extend to the outermost side to form the widthwise edges of the paper diaper 1, and both widthwise of the topsheet 11 disposed so as to overlap the mat 12 in the thickness direction. The edge is located further inside than both edges in the width direction of the backsheet 13.

A front patch 3 is attached to the non-skin surface side of the cover sheet 14.
The front patch 3 is to which the fastening tape 2 is coupled by a fastening mechanism, and the fastening tape 2 is provided at each of both end portions in the width direction of the back body 1C. In FIG.1 and FIG.2, the fastening tape 2 provided in two on the width direction both sides of the back body 1C is illustrated. However, it is sufficient that at least one fastening tape 2 is provided on both sides in the width direction, and the number is not limited. These fastening tapes 2 are extended outward in the width direction from both edge portions 1S of the back body 1C. Note that the front patch is not essential, and for example, the cover sheet 14 may be made of a material that can be hooked with the fastening tape.

In the present embodiment, a hook material (male member) and a loop material (female member) are used as a fastening mechanism that joins the fastening tape 2 and the front patch 3 and fixes both sides of the back body 1C to both sides of the front body 1A. A planar fastener is used that is fixed by mechanical coupling.
The surface fastener is constituted by a combination of a hook material having a large number of protrusions (for example, a hook shape or a mushroom shape) formed on the surface and a loop material having a loop-shaped fiber disposed on the surface. That is, either one of the fastening tape 2 and the front patch 3 is provided with a hook material, and the other is provided with a loop material. By using the planar fastener, the hook material and the loop material can be firmly fixed while being able to be peeled off, and repeated use is also possible.
However, you may use an adhesive, an adhesive tape, etc. for a fastening mechanism.

[1-2. Detailed configuration]
Next, a detailed configuration of the disposable diaper 1 will be described with reference to FIGS.
Here, a structure for bending and holding the crotch part 1B in a predetermined shape in the mounted state (hereinafter referred to as “folded holding structure”) will be described. In addition, since irregular bending and twisting of the crotch part 1B lowers the comfort of the wearer, the bending holding structure is provided to secure the wearer's comfort by bending the crotch part 1B into a predetermined shape. It is provided on the disposable diaper 1.

  As this bent holding structure, an embossed portion 20 (groove portion) for bending the shape of the crotch 1B into a predetermined shape is provided, and a misalignment gather for holding the shape of the crotch 1B bent into a predetermined shape (Support Gather) 32 is provided. Further, the mat 12 is provided with a configuration for reliably bending the crotch portion 1B into a predetermined shape by the embossed portion 20.

  The paper diaper 1 is provided with a leg gather 31 and a three-dimensional gather 33 along with the misalignment gather 32. In this embodiment, these gathers 31, 32, and 33 are all provided symmetrically with respect to the center line C in the width direction. The misalignment gathers 32 are also called inner gathers because they are arranged closer to the center line C (inner side) in the width direction than the leg gathers 31.

<Embossed part>
The embossed portion 20 is at least a pair (two) of the crotch portion 1B extending in the longitudinal direction and recessed. In addition, the embossed part 20 is not provided in the front body 1A and the back body 1C.

  Here, the embossed portion 20 is provided on the top sheet 11 and the mat 12. That is, the embossed portion 20 is disposed on the skin surface side of the paper diaper 1. In addition, the embossing part 20 should just be provided in the mat | matte 12 at least, and does not need to be provided in the top sheet 11. FIG.

  The embossed portion 20 can be recessed (embossed) by partially pressing (squeezing) the mat 12 on which the top sheet 11 is laminated. In this case, the mat 12 provided with the embossed portion 20 is pressed (consolidated). In other words, the embossed portion 20 is formed by pressing the mat 12.

  In the present embodiment shown in FIGS. 1 and 2, as an example of the embossed portion 20, linear embossed portions that are arranged symmetrically with respect to the center line C in the width direction and are parallel to each other and form a pair. 20 is illustrated. However, the embossed portion 20 may be embossed (line embossed) extending in a line extending in the longitudinal direction, and is not limited to a linear line embossed, but is a wavy line embossed or other curved line embossed such as an arc. It may be.

  Further, in the present embodiment, the left and right embossed portions 20 are parallel to the center line C, but the left and right embossed portions 20 may be separated or approached from one to the other in the longitudinal direction. . Furthermore, although the embossing part 20 should just be provided one each on either side like this embodiment, you may provide two each on either side, and each number is not limited. Moreover, the embossed part 20 may be provided other than the symmetrical embossed part 20, and three or more embossed parts 20 may be provided.

<Leg gather>
The leg gather 31 is provided in order to improve the followability to a wearer's leg part. The leg gathers 31 are provided at both edge portions 1S on the outer side in the width direction of the paper diaper 1 in the width direction. The leg gathers 31 are provided in the longitudinal direction so as to extend in the longitudinal direction over the entire area of the crotch 1B and the portion of the front body 1A near the crotch 1B and the portion of the back body 1C near the crotch 1B. ing. Further, the leg gathers 31 are formed in areas where the mats 12 are not disposed on both edges 1S on the outer side in the width direction of the paper diaper 1 in the crotch 1B, and in the front body 1A and the back body 1C, 12 is formed in a region adjacent to 12, respectively.

  The leg gathers 31 are formed by being contracted in the longitudinal direction by an elastic member (first elastic member) 41 that exerts a contracting force in the longitudinal direction and provided with wrinkles. The first elastic member 41 is composed of two linear elastic bodies (first linear elastic bodies) 41a and 41b, as indicated by broken lines in FIG. In the width direction, the first elastic member 41 is located at both edges 1S of the disposable diaper 1 at the crotch 1B, and at the outer edge of the mat 12 and the area adjacent to the mat 12 at the front body 1A and the back body 1C. , Respectively. Further, the first elastic member 41 is provided so as to extend in the longitudinal direction across the entire area of the crotch 1B and the portion of the front body 1A near the crotch 1B and the part of the back body 1C near the crotch 1B. Yes.

<Gathering misalignment>
The misalignment gathers 32 are provided to lift and support the mat 12 to the skin surface side and prevent the mat 12 from shifting in the mounted state. This misalignment gather 32 corresponds to the width direction inner side of the leg gathers 31 and the width direction outer side of the embossed portion 20 in the width direction, corresponding to the vicinity of both edges (closer to the edges) of the mat 12 in the width direction. Is arranged. The misalignment gather 32 extends in the longitudinal direction from the crotch part 1B to the crotch part 1B of the front body 1A of the mat 12 to the crotch part 1B of the back body 1C. Are arranged as follows.

  Further, the misalignment gather 32 is disposed at a position overlapping the mat 12 in the thickness direction (in plan view) in the region of the crotch 1B. Here, the longitudinal direction position of the misalignment gather 32 matches the longitudinal direction position of the mat 12. As described above, it is not essential that the longitudinal position of the misalignment gather 32 and the longitudinal direction position of the mat 12 coincide with each other, but it is preferable that all the misalignment gathers 32 are arranged at positions where the mat 12 overlaps. In this case, the misalignment gather 32 includes a configuration that does not cover the entire area of the mat 12 in the longitudinal direction, but the misalignment gather 32 acts on the mat 12 without waste. Further, the arrangement of the misalignment gather 32 is not limited to this, and it is sufficient that at least a part of the misalignment gather 32 is disposed at a position where the mat 12 overlaps.

  The misalignment gather 32 is also formed by being contracted in the longitudinal direction by the elastic member (second elastic member) 42 that exerts a contracting force in the longitudinal direction and is wrinkled. The second elastic member 42 is configured by three linear elastic bodies (second linear elastic bodies) 42a to 42c arranged along the longitudinal direction as indicated by broken lines in FIG.

  The second elastic member 42 corresponds to the vicinity of both edges in the width direction of the mat 12 in the width direction, on the inner side in the width direction than the first elastic member 41 of the leg gather 31 and on the outer side in the width direction than the embossed portion 20. Are arranged as follows. In the longitudinal direction, the second elastic member 42 has an effective range (a range in which the elastic force is exerted) of the back body 1C from the portion of the front body 1A of the mat 12 near the crotch 1B centering on the crotch 1B. It arrange | positions so that it may extend in a longitudinal direction over the part near crotch 1B.

  Naturally, the effective range in the longitudinal direction of the second elastic member 42 also corresponds to the misalignment gather 32, and the effective range in the longitudinal direction of the second elastic member 42 matches the longitudinal range of the mat 12. . Although it is not essential that the effective range of the second elastic member 42 coincides with the longitudinal range of the mat 12, it is preferable that the entire effective range of the second elastic member 42 is disposed at a position overlapping the mat 12. In this case, the second elastic member 42 does not cover the entire area of the mat 12 in the longitudinal direction, but the second elastic member 42 acts on the mat 12 without waste. Further, the arrangement of the effective range of the second elastic member 42 is not limited to this, and it is sufficient that at least a part of the effective range of the second elastic member 42 is arranged at a position where it overlaps the mat 12.

<Three-dimensional gather>
The three-dimensional gather 33 is provided to prevent the excreted liquid from leaking outward in the width direction. The base end of the three-dimensional gather 33 is arranged in the width direction on the outer side in the width direction with respect to the misalignment gather 32 and on the inner side in the width direction with respect to the leg gather 31 in the width direction. The three-dimensional gathers 33 are arranged in the longitudinal direction so as to extend in the longitudinal direction over substantially the entire length excluding the longitudinal end portion of the disposable diaper 1 (this end portion is a fixed portion and has no expansion / contraction function).

  As shown in FIGS. 3 and 4, the inner side in the width direction of the side sheet 10 includes an inner extending portion 10 </ b> S that extends from the edge of the top sheet 11 to which the side sheet 10 is joined to the skin surface side. Have. The inner extending portion 10S is formed over the entire length of the side seat 10, and a three-dimensional gather 33 is formed in the inner extending portion 10S. The proximal end of the three-dimensional gather 33 corresponds to the edge on the proximal end side of the inner extending portion 10 </ b> S, that is, the portion where the inner extending portion 10 </ b> S starts to separate from the top sheet 11.

  The three-dimensional gather 33 is formed by being contracted in the longitudinal direction by an elastic member (third elastic member) 43 that exerts a contracting force in the longitudinal direction and having wrinkles. As shown in FIGS. 3 and 4, the edge portion on the front end side of the inner extending portion 10 </ b> S has a double structure in which it is folded and joined, and the third elastic member 43 is formed inside the double structure portion. Is arranged.

  The third elastic member 43 is constituted by two linear elastic bodies (third linear elastic bodies) 43a and 43b as shown by a broken line in FIG. 1 and by a cross section in FIGS. The 3rd elastic member 43 is arrange | positioned so that it may extend in a longitudinal direction over the full length except the longitudinal direction edge part (this edge part is a fixing | fixed part, and there is no expansion / contraction function) of the paper diaper 1 in a longitudinal direction. .

<Characteristics of each gathering>
The leg gathers 31, the misalignment gathers 32, and the three-dimensional gathers 33 are all formed by being contracted in the longitudinal direction by the elastic members 41, 42, and 43 and having wrinkles. These elastic members 41, 42, and 43 are each mounted by being continuously joined in an expanded state between the sheets to be mounted. These elastic members 41, 42, and 43 exhibit contraction force.

  In the present embodiment, each of the elastic members 41, 42, 43 is composed of a plurality of linear elastic bodies 41a, 41b, 42a to 42c, 43a, 43b. Thread rubber (thread-like rubber) using rubber or synthetic rubber or thread-like stretchable film can be applied. The elastic members 41, 42, 43 constituted by these linear elastic bodies 41 a, 41 b, 42 a to 42 c, 43 a, 43 b are respectively arranged between the sheets constituting the paper diaper 1.

  That is, the first elastic member 41 of the leg gather 31 is disposed between the side sheet 10 and the back sheet 13 in the crotch 1B. The leg gathers 31 are arranged between the side seat 10 and the back seat 13 in the front body 1A and the back body 1C, which are mainly fixed ends, respectively, but in the front body 1A and the back body 1C, It may be disposed between the cover sheet 14 and the back sheet 13 and the cover sheet 14.

  The second elastic member 42 of the shift stop gather 32 is disposed between the back sheet 13 and the cover sheet 14 in the entire area. The effective range of the second elastic member 42 of the misalignment gather 32 is arranged at a position where all of the second elastic members 42 overlap with the mat 12, so that when the linear elastic bodies 42 a to 42 c of the second elastic member 42 expand and contract, they are linear. Rubbing occurs between the elastic bodies 42a to 42c and the sheet in contact therewith. When the linear elastic bodies 42 a to 42 c are in direct contact with the mat 12, rubbing occurs between the linear elastic bodies 42 a to 42 c and the mat 12, and the mat 12 is torn or collapsed. Absorbability may be reduced. In particular, when a tissue is used for the wrap sheet, the linear elastic bodies 42a to 42c and the tissue are rubbed, so that the tissue is easily torn.

  In this regard, the linear elastic bodies 42a to 42c of the second elastic member 42 are disposed between the back sheet 13 and the cover sheet 14, thereby avoiding contact between the linear elastic bodies 42a to 42c and the mat 12. Then, the contraction force of the second elastic member 42 is transmitted to the mat 12 through the back sheet 13, and the mat 12 is lifted and supported by the misalignment gather 32 without causing the mat 12 to break or collapse. At the same time, the mat 12 can be prevented from shifting.

  1 to 4, the first elastic member 41 of the leg gather 31 has two linear elastic bodies 41a and 41b, and the second elastic member 42 of the shift stop gather 32 has three linear shapes. Although the elastic bodies 42a to 42c and the third elastic member 43 of the three-dimensional gather 33 are provided with two linear elastic bodies 43a and 43b, respectively, the elastic members 41, 42 and 43 and the linear elastic bodies 41a and 41b are provided. , 42a to 42c, 43a, 43b are applied with elastic characteristics according to the requirements for the gathers 31, 32, 33.

In particular, between the first elastic member 41 of the leg gather 31 and the second elastic member 42 of the shift stop gather 32, the first elastic member 41 has a higher elastic modulus than the second elastic member 42 is applied. Has been. That is, the elastic member 41 on the outer side in the width direction has a higher elastic modulus than the elastic member 42 on the inner side in the width direction.
In other words, when the same elongation (elongation rate) is given, the elastic member 41 on the outer side in the width direction exhibits a stronger elastic force than the elastic member 42 on the inner side in the width direction.

The “elastic modulus” mentioned here is an elastic coefficient or an elastic constant mainly focusing on the expansion and contraction of the disposable diaper 1 in the longitudinal direction, corresponds to the Young's modulus E shown below, and corresponds to the spring constant k. Can do.
E = σ / ε
σ: Stress due to expansion of elastic member ε: Distortion due to expansion of elastic member Therefore, if the Young's modulus (elastic modulus) of the first elastic member 41 is E1, and the Young's modulus (elastic modulus) of the second elastic member 42 is E2, E1 and E2 have the relationship of the following formula (1).
E1> E2 (1)

  As described above, when the first elastic member 41 is applied with a higher elastic modulus than the second elastic member 42, the first elastic member 41 is second when the same elongation is given. An elastic force stronger than that of the elastic member 42 is exhibited. That is, since the leg gathers 31 are in close contact with the skin surface with a stronger elastic force than the misalignment gathers 32, the liquid between the leg gathers 31 and the misalignment gathers 32 is not misaligned when the paper diaper 1 is attached. It is easy to move to the 32 side and is difficult to leak to the leg gather 31 side.

In the present embodiment, each elastic member 41, 42 is configured by a plurality of linear elastic bodies 41a, 41b, 42a, 42b, 42c, and the linear elastic bodies 41a, 41b, 42a, 42b, 42c. If the Young's modulus (elastic modulus) is E1a, E1b, E2a, E2b, E2c, respectively, the Young's modulus (elastic modulus) E1, E2 of the first elastic member 41 and the second elastic member 42 is expressed by the following equation (2A), As shown in (2B), a composite value (= added value) of Young's modulus (elastic modulus) of each linear elastic body is obtained.
E1 = E1a + E1b (2A)
E2 = E2a + E2b + E2c (2B)

  In addition, said synthetic | combination value is a simple addition value supposing the case where a some linear elastic body acts integrally. Actually, since the plurality of linear elastic bodies are arranged slightly apart from each other, the plurality of linear elastic bodies do not act completely integrally. It is also assumed that the (elastic modulus correlated with the adhesion to the skin surface) is lower than a simple addition value such as the above synthetic value.

In the present embodiment, each of the linear elastic bodies 41a and 41b of the first elastic member 41 and each of the linear elastic bodies 42a to 42c of the second elastic member 42 are located on the outer side in the width direction than those on the inner side in the width direction. It is preferable that the thing has a higher elastic modulus.
That is, the linear elastic bodies 41a and 41b are arranged as shown in the following equation (3A), and the linear elastic bodies 42a to 42c are arranged as shown in the following equation (3B). What has a higher elastic modulus is applied to the body.
E1a <E1b (3A)
E2a <E2b <E2c (3B)

As for the linear elastic bodies 42a to 42c, as shown in the following formulas (3B1) and (3B2), those having a higher elastic modulus as the linear elastic bodies are arranged on the outer side in the width direction. May be applied.
E2a = E2b <E2c (3B1)
E2a <E2b = E2c (3B2)

  Thus, when the linear elastic body on the outer side in the width direction has a higher elastic modulus than the linear elastic body on the inner side in the width direction, when the same elongation is given, the outer linear shape The elastic body exhibits a stronger elastic force than the inner linear elastic body. In other words, the gathered part near the outer linear elastic body adheres to the skin surface with a stronger elastic force than the gathered part near the inner linear elastic body. The liquid between the vicinity of the elastic body easily moves to the inner linear elastic body side and is difficult to leak to the outer linear elastic body side.

  In the present embodiment, the first elastic member 41 and the third elastic member 43 are both composed of two linear elastic bodies, whereas the second elastic member 42 is composed of three linear elastic members. It is comprised with the bodies 42a-42c. As described above, the second elastic member 42 is constituted by a larger number of linear elastic bodies, thereby suppressing the elasticity necessary for the second elastic member 42 while suppressing the elastic modulus (elastic force) of each linear elastic body. The rate (elastic force) can be secured. This makes it difficult for the elastic force of the second elastic member 42 to act locally on the mat 12.

  In addition, although each elastic member 41, 42, 43 may be comprised with a single linear elastic body, each gather 31, 32, 33 wears by comprising combining several linear elastic bodies. It is possible to suppress the local strong contact with the skin of the person, and the gathers 31, 32, and 33 can be pressed into the wearer's skin with a soft and necessary adhesion. In the case of the second elastic member 42, in addition to this, it is required to suppress the influence on the mat 12 (which causes the mat 12 to break or collapse).

  When the elastic members 41, 42, 43 are configured by combining a plurality of linear elastic bodies, most commonly, the linear elastic bodies are arranged in parallel to each other. In addition, the distance between adjacent linear elastic bodies in the case where they are arranged in parallel is preferably shorter from the viewpoint of securing the elastic modulus (elastic force) of the elastic member. However, the distance between the linear elastic bodies is set in consideration of the processing restrictions and the influence on the shapes of the gathers 31, 32, and 33 formed by these linear elastic bodies.

  Moreover, it is not always necessary to arrange the linear elastic bodies in parallel with each other. That is, various arrangements are conceivable, for example, a portion in the longitudinal direction is brought close to each other between adjacent linear elastic bodies and other portions are gradually separated from each other. For example, as described above, when the linear elastic bodies are separated from each other, it is assumed that the substantial elastic modulus of the elastic member (the elastic modulus that correlates with the adhesion to the skin surface) decreases. When securing a substantial elastic modulus (E1> E2) of the member 41 is required only for the main part in the longitudinal direction, and soft touch to the skin surface is required in other parts, linear elasticity is required in the main part. It is conceivable that the bodies 41a and 41b are close to each other and separated from each other.

[2. Used paper diapers]
Next, the crotch part 1B in the mounted state will be described with reference to FIGS.
In the mounted state, the crotch 1B is bent into a predetermined shape. Specifically, as shown in FIG. 4 (a), the cross section of the crotch 1B is swelled to the skin surface side with the center of the width direction as the apex, as shown in FIG. Since the outer side also rises to the skin surface side, as shown in FIG. 4B, it is bent into a predetermined shape of “W” shape. The “W” -shaped portion is referred to as two V-shaped portions, and one V-shaped portion and the other V-shaped portion are referred to as V-shaped portions 51 and 52. Moreover, if the position of a crease | fold is a skin surface side, it will call a mountain fold, and if it is a non-skin surface side, it will call a valley fold.

  In this mounted state, the embossed portion 20 serves as a fold to guide the valley break of the crotch 1B. Specifically, two valley folds are guided by folding the crotch portion 1B with the two embossed portions 20 as folds. And the two embossing parts 20 are located in the site | part corresponding to each corner | angular part of the V-shaped parts 51 and 52. FIG. In the crotch part 1B at this time, the intermediate part in the width direction of the two embossed parts 20 is mountain-folded in an inverted V shape, and the center in the width direction becomes a fold.

  In the crotch part 1B bent in a predetermined shape as described above, the shift stop gathers 32 formed by the second elastic member 42 are located on the outer sides in the width direction of the V-shaped parts 51 and 52. The mat 12 is contracted in the longitudinal direction by the shift stop gathers 32 contracted by these second elastic members 41, and the crotch part 1B is lifted to the skin side as a whole.

[3. Action and effect]
Since the paper diaper is configured as described above, the following operations and effects can be obtained.
Since the mat 12 is contracted in the longitudinal direction by the second elastic member 42, the mat 12 is lifted to the skin surface side, and the bending of the mat 12 at the embossed portion 20 can be reliably held.
Therefore, the crotch part 1B of the disposable diaper 1 is bent and held in a predetermined shape in the mounted state, and the tactile sensation and the liquid absorption can be secured to improve the wearer's comfort.

  Further, the first elastic member 41 forming the leg gathers 31 has a higher elastic modulus than the second elastic member 42 forming the shift stop gathers (inner gathers) 32. When the gathers 32 are stretched in the same manner, the first elastic member 41 is in close contact with the skin surface with a stronger elastic force than the second elastic member 42. The liquid between the stop gathers 32 is easy to move to the shift stop gathers 32 side and is difficult to leak to the leg gathers 31 side, thereby suppressing side leakage.

  Further, the first linear elastic bodies 41a and 41b constituting the first elastic member 41 and the second linear elastic bodies 42a, 42b and 42c constituting the second elastic member 42 are wider than those inside the width direction. Since the outer one in the direction has a higher elastic modulus, the gathered portion near the outer linear elastic body is on the inner side both in the vicinity of the first elastic member 41 and in the vicinity of the second elastic member 42. It adheres to the skin surface with a stronger elastic force than the gathered portion near the linear elastic body. As a result, the liquid between the vicinity of the outer linear elastic body and the vicinity of the inner linear elastic body easily moves to the inner linear elastic body and leaks to the outer linear elastic body. It becomes difficult to leak to the outside, and so-called side leakage is suppressed.

  Further, since the misalignment gather 32 and the second elastic member 42 are arranged so as to correspond to the vicinity of both edges in the width direction of the mat 12, the second elastic member 42 of the misalignment gather 32 has a width of the mat 12. Since the fit and adhesion to the wearer at each edge in the direction are efficiently improved, the effect of enhancing the absorbability of excrement by the mat 12 is obtained. Further, since the excrement is easily absorbed by the mat 12, the effect of suppressing the excretion of the excrement to the outside is enhanced. When excrement leaks outside the mat 12, as described above, the relationship between the elastic modulus of the first elastic member 41 and the second elastic member 42 and the lines constituting the elastic members 41, 42. Leakage of excrement to the outside is suppressed due to the elastic modulus relationship between the elastic bodies 41a, 41b, 42a, 42b, and 42c.

  Since the second elastic member 42 is constituted by a plurality of second linear elastic bodies more than the first and third elastic members 41 and 43, the elastic modulus (elastic force) of each linear elastic body is suppressed. Also, the elastic modulus (elastic force) required for the second elastic member 42 can be ensured, and the elastic force of the second elastic member 42 is less likely to act locally on the mat 12 to protect the mat 12 ( That is, it is possible to ensure the fit of the mat 12 to the skin surface by the misalignment gather 32 while preventing the mat 12 from being damaged or deformed.

  Since the longitudinal position of the effective range of the misalignment gather 32 and the second elastic member 42 coincides with the longitudinal position of the mat 12, the contraction force of the second elastic member 42 is efficiently exhibited from this point as well, The fit and adhesion of the mat 12 to the wearer can be improved, and the absorbability of excrement by the mat 12 can be increased. In addition, if at least all of the misalignment gathers 32 and all of the effective range of the second elastic member 42 are arranged in a region overlapping the mat 12 in the thickness direction, the contraction force of the second elastic member 42 is efficiently exhibited. Further, the mat 12 can be improved in fit and adhesion, and the mat 12 can improve the absorbability of excrement.

  The second elastic member 42 is disposed between the back sheet 13 and the cover sheet 14, and the shift stop gather 32 is formed by the back sheet 13 and the cover sheet 14 that receive contraction force by the second elastic member 42. Since it is formed, in order to avoid the direct contact between the second elastic member 42 and the mat 12 and transmit the contraction force of the second elastic member 42 to the mat 12 through the back sheet 13, a tissue that is a wrap sheet of the mat 12 The mat 12 is lifted and supported by the misalignment gather 32 while the mat 12 is prevented from being damaged and the mat 12 is prevented from being damaged, such as tearing or collapsing. It can be prevented from shifting.

  Further, the first elastic member 41 is disposed between the side sheet (skin side sheet) 10 and the back sheet 13, and the leg gather 31 includes the side sheet 10 and the back that receive contraction force by the first elastic member 41. Since it is formed by the sheet 13, the strength of the leg gathers 31 is ensured by the side sheet 10 and the back sheet 13, and the durability of the disposable diaper 1 can be improved.

  Further, adjacent to both edges of the mat 12 in the width direction, the mat is formed three-dimensionally from the top sheet (skin surface side sheet) 11 toward the skin surface side by the third elastic member 43 that exhibits contraction force in the longitudinal direction. Since the three-dimensional gather 33 is further included, leakage of the excrement to the outside is also suppressed by the three-dimensional gather 33.

  On the inner side in the width direction of the side sheet 10, there is an inner extending portion 10 </ b> S that extends from the top sheet 11 to the skin surface side, and a three-dimensional gather 33 is provided in the inner extending portion 10 </ b> S, Since the three-dimensional gathers 33 are formed using the side sheets 10, the number of constituent members of the paper diaper 1 can be suppressed.

[II. Others]
As mentioned above, although embodiment of this invention was described, this invention may deform | transform and implement the said embodiment as follows.
For example, in the above embodiment, the three gathers of the leg gather 31, the misalignment gather 32, and the three-dimensional gather 33 are equipped. However, in the present invention, the leg gather 31 and the misalignment gather 32 may be equipped. 33 is not essential.

Moreover, although the embossed part 20 is provided in the said embodiment, the embossed part 20 is not essential in this invention. Moreover, the embossed part 20 may be provided in a part of the front body 1A and the back body 1C.
In addition, in place of or in addition to the embossed portion 20, a corresponding portion of the mat 12 may be thinned or a groove-like portion that penetrates may be provided in the mat 12. Further, the embossed portion 20 may be provided on the non-skin surface side of the mat 12 or may be provided on the skin surface side and non-skin surface side of the mat 12.

1 disposable diaper (absorbent article)
DESCRIPTION OF SYMBOLS 1A Front body 1B Crotch part 1C Back body 1S The outer edge of the width direction of a paper diaper (absorbent article) 2 Fastening tape 3 Front patch 10 Side sheet (skin side sheet)
10S Inside extension part of side sheet 10 11 Top sheet (skin side sheet)
12 mat (absorber)
13 Back sheet (first non-skin side sheet)
14 Cover sheet (second non-skin side sheet)
20 Embossed part (grooved part)
31 Leg gathers 41 First elastic members 41a, 41b First linear elastic bodies 32 Gathering stoppers (support gathers) as inner gathers
42 2nd elastic member 42a, 42b, 42c 2nd linear elastic body 33 Solid gathers 43 3rd elastic member 43a, 43b 3rd linear elastic body 51, 52 V-shaped part C Center line of width direction

Claims (10)

An absorbent body, a skin-side sheet that covers the absorbent body from the skin side, and a non-skin-side sheet that covers the absorbent body from the non-skin side, and the longitudinal direction is the inseam of the wearer's crotch An absorbent article to be worn along the front-rear direction of
The absorber is arranged except for both outer edges in the width direction intersecting the longitudinal direction,
Leg gathers that are each formed in a region including both edges and formed by a first elastic member that exerts a contracting force in the longitudinal direction;
An inner gather formed by a second elastic member that is disposed closer to the inner side in the width direction than the leg gathers and exerts a contracting force in the longitudinal direction,
The absorbent article, wherein the first elastic member has a higher elastic modulus than the second elastic member. The absorbent article according to claim 1, wherein the position of the inner gather in the width direction is set so as to correspond to both edges in the width direction of the absorbent body. The second elastic member is constituted by a plurality of second linear elastic bodies that are parallel to each other and extend in the longitudinal direction,
The absorbent article according to claim 1 or 2, wherein the plurality of second linear elastic bodies have higher elastic modulus on the outer side than on the inner side in the width direction. The first elastic member is constituted by a plurality of first linear elastic bodies that are parallel to each other and extend in the longitudinal direction,
The plurality of first linear elastic bodies have a higher elastic modulus on the outer side than on the inner side in the width direction. Absorbent articles. The first elastic member is composed of one or more first linear elastic bodies that are parallel to each other and extend in the longitudinal direction, and the second elastic member is parallel to each other and extends in the longitudinal direction. The absorbent article according to any one of claims 1 to 3, wherein the absorbent article is composed of a plurality of second linear elastic bodies larger than the number of linear elastic bodies. The absorbent article according to any one of claims 1 to 5, wherein the entire effective range of the second elastic member is arranged in a region overlapping with the absorber in the thickness direction. The absorption according to any one of claims 1 to 6, wherein a groove-like portion extending in the longitudinal direction is formed closer to the inner side in the width direction than the inner gathers of the absorber. Sex goods. The non-skin side sheet has a back sheet and a cover sheet that are arranged in order from the side close to the absorber,
The second elastic member is disposed between the back sheet and the cover sheet;
The absorptive article according to any one of claims 1 to 7, wherein the inner gathers are formed by the back sheet and the cover sheet which receive contraction force by the second elastic member. The first elastic member is disposed between the skin surface side sheet and the back sheet,
The absorbent article according to claim 8, wherein the leg gather is formed by the skin surface side sheet and the back sheet that receive contraction force by the first elastic member. The skin surface side sheet includes a top sheet disposed so as to overlap the entire surface of the absorbent body or a region excluding both side edges in the width direction, and a side sheet disposed on the outer side in the width direction than the top sheet. And
On the inner side in the width direction of the side sheet, there is an inner extending portion that is detachable from the skin surface side sheet to the skin surface side,
The absorbent article according to any one of claims 1 to 9, wherein a solid gather is provided in the inner extending portion.

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