WO2017159262A1

WO2017159262A1 - Stretch structure for absorbent article, and underpants-type disposable diaper

Info

Publication number: WO2017159262A1
Application number: PCT/JP2017/006706
Authority: WO
Inventors: 貞直真鍋
Original assignee: 大王製紙株式会社
Priority date: 2016-03-14
Filing date: 2017-02-23
Publication date: 2017-09-21
Also published as: JP6254625B2; JP2017164034A

Abstract

The present invention addresses the problem of enabling a softer feel to be obtained when a product in the natural length state thereof is touched by a hand. This stretch structure for an absorbent article has two sheet layers (12S, 12H) extending in a stretch direction and an orthogonal direction orthogonal to the stretch direction, and a plurality of narrow elastic stretch members (19) which extend along the stretch direction and are disposed at an interval in the orthogonal direction between the sheet layers (12S, 12H), both end parts in the stretch direction of the elastic stretch members (19) being configured as fixed end parts (19f) fixed to the two sheet layers (12S, 12H), the elastic stretch members (19) having sheet joining parts (20) in which the two sheet layers (12S, 12H) are joined via a hot-melt adhesive (H2) in inter-fixed-end-part regions (MA) between the fixed end parts (19f), and the sheet joining parts (20) being a plurality of linear sheet joining parts (20) which are each continuous in the stretch direction and are arranged in the orthogonal direction without intersecting with each other.

Description

Stretch structure of absorbent article and pants-type disposable diaper

The present invention relates to a stretchable structure of an absorbent article that makes the touch in a natural length state more flexible, and a pants-type disposable diaper that employs the structure.

In absorbent articles, it is common to provide a stretchable structure to improve the fit of each part. For example, in a disposable diaper of a pants type or a tape type, it is widely performed to provide a stretchable structure in the waistline direction at the waistline part or to provide a stretchable structure in a direction along the leg circumference at the leg circumference part. . Furthermore, not only pants-type and tape-type disposable diapers, but also a wide range of absorbent articles including sanitary napkins, it is also widely practiced to provide a stretchable structure in the front-rear direction called three-dimensional gathers or flat gathers (for example, patents) Reference 1 to 3).

A typical stretchable structure of such an absorbent article includes an elongated elastic stretchable member provided between two sheet layers such as nonwoven fabrics along the stretch direction and spaced apart from each other. Is. The two sheet layers form a planar expansion / contraction region and play a role of covering and concealing the elastic expansion / contraction member, and the elastic expansion / contraction member built in between the two sheet layers generates a force for elastic expansion / contraction. It plays a role. The elastic expansion / contraction member is fixed to the two sheet layers at least at both ends of the expansion / contraction region in a state where the elastic expansion / contraction member is expanded in the expansion / contraction direction. By this fixing, the elastic stretchable member and the two sheet layers are integrated, and the two sheet layer sheet layers are shrunk by the shrinkage force of the elastic stretchable member to form wrinkles or wrinkles. When stretched against the contraction force of the expansion and contraction member, wrinkles and wrinkles are developed. Usually, the two sheet layers are unfolded with no wrinkles or wrinkles at the limit of elastic extension, wrinkles with the elastic expansion / contraction member contracting, and wrinkles close most closely with the natural length state.

In such a stretchable structure, if the two sheet layers are free from each other, one sheet layer may partially or entirely float with respect to the other sheet layer, which may cause unnecessary wrinkles and bulges. Therefore, the two sheet layers need to be joined directly or indirectly over almost the whole. Moreover, in order to produce elasticity by the elastic elastic member, the elastic elastic member extends over the entire expansion / contraction direction of the expansion / contraction region, and the portions located at both ends of the expansion / contraction region of the expansion / contraction region are in relation to the two sheet layers. In the natural length state, the two sheet layers need to be contracted as the elastic elastic member contracts. That is, it is necessary to bond the two sheet layers and fix the elastic stretchable member to the two sheet layers.

At present, as a means for fixing the elastic elastic member to the two sheet layers, in most cases, a hot melt adhesive is selected. On the other hand, in order to reduce the amount of hot melt adhesive used, the joining form between two sheets is often performed by welding such as ultrasonic welding, but a form using a hot melt adhesive is also possible. It is used persistently. For example, by joining two sheet layers via a hot melt adhesive at the passage position of the elastic stretchable member, it serves both as joining between the two sheet layers and fixing the elastic stretchable member to the two sheet layers. In addition to the combined form, there is known a form in which two sheet layers are joined via a hot melt adhesive that is intermittently arranged in the expansion / contraction direction and continues in a direction orthogonal to the expansion / contraction direction. (See Patent Documents 1 to 3)

JP 2004-229857 A JP 2013-132331 A JP 2014-209773 A

However, in the above dual-use type, the hardened portion is merely hardened by the shrinkage of the elastic elastic member even if it is bonded via the hot melt adhesive. Accordingly, there is a problem that the two sheet layers are hard to touch in the most contracted natural length state and feel hard when the user holds the product in their hands.

Also, in the stretchable structures described in Patent Documents 1 to 3, the softness in the natural length state is not always sufficient, although not as much as the above-mentioned combined form. The reason for this is not clear, but is thought to be affected by the following structural differences. That is, in the stretchable structures described in Patent Documents 1 to 3, a thin ridge in the stretch direction in the natural length state continues in a direction perpendicular to the stretch direction, and the tip of the fold is bent with a small radius of curvature, so that the material crease is formed. Since the folds having the folds are closely aligned at the same height, the folds are not easily crushed in the thickness direction and are not easily collapsed. Moreover, if the tip of the heel is bent with a small radius of curvature, a particularly hard feel is felt when the tip is touched.

Since the touch in the natural length state affects the user's product selection, improvement is strongly desired.
Therefore, the main problem of the present invention is to provide a more flexible feel when a product in a natural length state is touched with a hand in a stretchable structure that joins two sheet layers with a hot melt adhesive. It is in.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
Two sheet layers extending in the expansion / contraction direction and the orthogonal direction orthogonal thereto, and a plurality of elongated elastic expansion / contractions extending along the expansion / contraction direction, spaced between the sheet layers in the orthogonal direction. And having a member
The elastic expansion / contraction member is a fixed end formed by fixing both ends of the expansion / contraction direction in the expansion / contraction region to the two sheet layers, and the two sheet layers are not connected between the fixed ends. It is a fixed free part, or an intermittently fixed part that is intermittently fixed in the expansion and contraction direction,
In the stretchable structure of an absorbent article, wherein the two sheet layers are joined to each other through a hot melt adhesive in a region between the fixed ends that is defined as a region between the fixed ends. ,
The sheet joining portions are continuous with each other in the expansion / contraction direction and are a plurality of linear sheet joining portions arranged in the orthogonal direction without intersecting each other,
An elastic structure of an absorbent article characterized by the above.

(Function and effect)
The present inventor, while experimenting with a wide variety of stretchable structures, realized that when the sheet joint portion is continued in the stretchable direction in the stretchable region, the touch in the natural length state becomes flexible. This result was unthinkable from the conventional general perception that the continuity of the sheet joints increases, that is, the harder the sheet joints are packed.

The present invention has been made based on such knowledge. In the present invention, the reason why the feel in the natural length state is felt flexibly is not clear, but it is considered that the following structural differences are probably affected. That is, when the sheet joining portion is continuous in the expansion / contraction direction, the two sheet layers are deformed only along each other. As a result, in the state where the two sheet layers are contracted as the elastic expansion / contraction member contracts, including the natural length state, wrinkles are formed on both the front and back surfaces so that the two sheet layers follow each other. And when the two sheet layers are wavy so as to be along each other, not only is the rigidity improved simply by the number of sheet layers, but also due to the rigidity of the joining means in the sheet joining portion and the difference in curvature of the two sheet layers, As a result of bending more gently than the top of the heel (especially the difference from the conventional one in a natural length state), the touch is smooth, and it becomes easy to be crushed in the thickness direction, thereby improving the touch flexibility. In addition, when the two sheet layers form a gentle wave shape along each other, the wave crests and crests and the valleys and troughs are separated in the expansion and contraction direction, so that when the waves are collapsed in the thickness direction or collapsed, The effect of supporting mountains and valleys and valleys and valleys is weakened, and in this respect, it is considered that the touch becomes more flexible. When a smooth material is picked from the front and back with fingers, it is easier to feel smoothness by picking two sheets of the same material rather than one. This is because the frictional resistance between the materials is lower than the frictional resistance between the fingers or between the fingers and the material, so that the frictional resistance can be felt low (smoothly) when picking up two sheets. . If the two sheet layers are along each other, it is considered that this slip feeling can be strongly felt.

Furthermore, in the present invention, since the elastic stretchable member has a high degree of freedom with respect to the two sheet layers, there is little loss of stretch force and even if the sheet layer has uneven rigidity (for example, when the sheet layer is a nonwoven fabric, Even if the fiber density is uneven, it can be naturally contracted, and the amount of the elastic stretch member can be reduced as compared with the prior art.

<Invention of Claim 2>
The stretch structure of an absorbent article according to claim 1, wherein the plurality of sheet joint portions have the same linear shape.

(Function and effect)
Thus, when the sheet | seat junction part has the same linear shape, since a moderate wrinkle is formed regularly, it is preferable.

<Invention of Claim 3>
The sheet joint portion is provided in a straight line along the expansion / contraction direction without intersecting the elastic expansion / contraction member,
The elastic structure of the absorbent article according to claim 1.

(Function and effect)
In this way, it is preferable that the sheet joint portion is provided in a straight line because the wrinkles are particularly regularly formed.

<Invention of Claim 4>
The elastic elastic member is a free part that is not fixed to the two sheet layers between the fixed end parts,
3 or more elastic elastic members are provided at intervals in the orthogonal direction,
A plurality of free part regions defined as regions between the free parts adjacent in the orthogonal direction are provided adjacent to each other in the orthogonal direction;
The stretchable structure of an absorbent article according to claim 3, wherein the sheet joint portion is formed in each of the regions between the free portions.

(Function and effect)
When three or more elastic expansion / contraction members are provided at intervals in the orthogonal direction, it is not necessary to form a sheet joint portion in all the regions between the free portions adjacent to each other in the orthogonal direction, but the free portions of the elastic expansion / contraction member are orthogonal. Since it can move in the direction, the free part of the elastic elastic member adjacent to it may come into contact with it and smooth expansion or contraction may be hindered, or it may be easily marked if it touches the skin in a state where two elastic elastic members are aligned. . Moreover, when the space | interval of sheet | seat junction parts becomes large too much, it will become difficult for two sheet layers to mutually follow. Therefore, it is preferable to configure as described in this section.

<Invention of Claim 5>
5. The non-sheet joining region that does not have a sheet joining portion continues in at least both ends in the orthogonal direction in the region between the free portions in the unfolded state over the entire width direction of the region between the free portions. Elastic structure of absorbent articles.

(Function and effect)
When configured as described in this section, the free portion of the elastic stretchable member can freely move in the front-rear direction (direction perpendicular to the stretch direction) up to the region having the sheet joint portion, and the stretch structure having excellent fit Become.

<Invention of Claim 6>
The stretch structure of an absorbent article according to claim 1 or 2, wherein the linear sheet joint is formed in a wavy shape.

(Function and effect)
In this way, when the sheet joint portion is wavy, the two sheet layers can be widely integrated in the orthogonal direction with a smaller amount of hot melt adhesive than in the case where the sheet is formed in a straight line. As a result, wrinkles and bulges can be effectively prevented.

<Invention of Claim 7>
The elastic elastic member is a free part that is not fixed to the two sheet layers between the fixed end parts,
3 or more elastic elastic members are provided at intervals in the orthogonal direction,
A plurality of free part regions defined as regions between the free parts adjacent in the orthogonal direction are provided adjacent to each other in the orthogonal direction;
The sheet joint is formed so as to have a wave height over a plurality of the regions between the free parts adjacent in the orthogonal direction,
The number of the sheet joint portions provided in the region where the free part regions are arranged is smaller than the number of the free part regions arranged in the orthogonal direction.
The elastic structure of the absorbent article according to claim 6.

(Function and effect)
According to this embodiment, the two sheet layers can be widely integrated in the orthogonal direction with a particularly small amount of hot melt adhesive used, and the sheet layer can be effectively prevented from floating and resulting wrinkles and swellings. be able to. In this embodiment, the elastic stretchable member and the hot melt adhesive of the sheet joining portion intersect and the two sheet layers are joined at the intersecting portion, but are joined intermittently in the stretching direction. However, since the area of the joint is extremely small, hardening due to shrinkage is hardly a problem.
<Invention of Claim 8>
The stretch structure of an absorbent article according to any one of claims 1 to 7, wherein the two sheet layers have a bending resistance in the expansion / contraction direction higher than that in the orthogonal direction.

(Function and effect)
It is preferable to use such a sheet layer because the top of the ridge is easily bent.

<Invention of Claim 9>
An exterior body constituting a front body and a back body, and an interior body including an absorbent body attached to the inside of the exterior body, and both sides of the exterior body in the front body and both sides of the exterior body in the back body In a pants-type disposable diaper having side seal portions that are joined portions, and having an annular trunk periphery, a waist opening, and a pair of left and right leg openings,
The stretchable structure of the absorbent article according to any one of claims 1 to 8, wherein the stretchable direction is a width direction in a region including at least a portion of the exterior body that is located outside both side edges of the interior body. Provided to be,
A pants-type disposable diaper characterized by that.

(Function and effect)
The stretchable structure of the present invention is thus suitable for the region located at least on both sides in the width direction of the interior body in the exterior body of the pants-type disposable diaper.

As described above, according to the present invention, when a product in a natural length state is touched with a hand, advantages such as a more flexible feel can be obtained.

It is a top view of the unfolding state which shows the inner surface of a pants type disposable diaper. It is a top view of the unfolding state which shows the outer surface of a pants type disposable diaper. FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along the line 5-5 in FIG. It is a perspective view of a pants type disposable diaper. FIG. 3 is a cross-sectional view of an interior body corresponding to a 3-3 cross section in FIG. 1. FIG. 4 is a cross-sectional view of the interior body corresponding to the 4-4 cross section of FIG. 1. It is a top view of the unfolding state which shows the outer surface of a pants type disposable diaper. FIG. 10 is a cross-sectional view corresponding to the 6-6 cross section of FIG. 9. It is a principal part enlarged plan view of the expansion | deployment state of an exterior body. It is a principal part enlarged plan view of the expansion | deployment state of an exterior body. It is an arrangement plan of an elastic elastic member and hot melt adhesive in the deployment state of an exterior body. It is an arrangement plan of an elastic elastic member and hot melt adhesive in the deployment state of an exterior body. FIG. 7A is an enlarged plan view of a main part in an expanded state of the exterior body, and FIG. 7B is a 7-7 cross-sectional view of the expanded state of the exterior body. (A) 8-8 cross-sectional view of the exterior body in the natural length state, (b) 9-9 cross-sectional view of the exterior body in the natural length state, (c) 10-10 cross-sectional view of the exterior body in the natural length state, (d FIG. 7 is a 7-7 cross-sectional view of the exterior body in a natural length state. (A) An enlarged plan view of the main part in the unfolded state of the outer package, (b) an 8-8 cross-sectional view of the natural length of the outer package, (c) a 10-10 cross-sectional view of the natural length of the outer package, (d) FIG. 7 is a 7-7 cross-sectional view of the exterior body in a natural length state. It is a perspective view of a cutting device. It is an enlarged plan view of the non-stretchable region and the stretchable region of the exterior body. It is explanatory drawing of the test piece of a peeling strength measurement test. It is explanatory drawing of a peeling strength measurement test. It is explanatory drawing of the test piece of a holding force measurement test. It is explanatory drawing of a holding force measurement test.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 6 show an example of a pants-type disposable diaper. The dotted pattern in the cross-sectional view shows an adhesive as a joining means for joining the constituent members located on the front side and the back side, and is a solid, bead, curtain, summit or spiral application such as a hot melt adhesive, The fixed portion of the elastic stretchable member is formed by coating the outer peripheral surface of the elastic stretchable member, such as a comb gun or a shroud coating, instead of or together with this. As joining means for joining the constituent members, fixing means by material welding such as heat sealing or ultrasonic sealing can be used.

The underpants type disposable diaper of this form is the

exterior body

12F, 12B which comprises the front body F and the back body B, and the inner side of the

exterior body

12F, 12B so that it may extend from the front body F to the back body B through the crotch part. The side body 12A is formed by joining the both sides of the exterior body 12F of the front body F and the both sides of the exterior body 12B of the back body B to each other. . Symbol Y indicates the total length of the diaper in the unfolded state (vertical length from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and symbol X indicates the total width of the diaper in the unfolded state. Is shown.

The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior body 12 is a part that supports the interior body 200 with respect to the wearer's body. In this embodiment, the upper openings of the

exterior bodies

12F and 12B become waist openings WO through which the wearer's torso passes, and the lower edges of the

exterior bodies

12F and 12B and the side edges of the interior body 200 on both sides in the width direction of the interior body 200, respectively. The enclosed part is a leg opening LO through which the leg passes.

The pants-type disposable diaper of this embodiment forms a waist region T defined as a longitudinal range (a longitudinal range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a leg opening LO. It has an intermediate region L that is defined as a front-rear direction range (between the longitudinal region having the side seal portion 12A of the front body F and the longitudinal region having the side seal portion 12A of the rear body B). The waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this. Usually, in the case where there is a boundary in the waistline region T in which the width direction expansion / contraction stress changes (for example, the thickness or elongation rate of the elastic expansion / contraction member changes), the waist opening WO side is closer to the waist opening than the boundary on the waist opening WO side. When there is no such boundary, the waist opening WO side becomes the waist portion W with respect to the absorbent body 56 or the interior body 200. The length in the vertical direction varies depending on the size of the product and can be determined as appropriate. For example, the waist portion W can be 15 to 40 mm, and the waist lower portion U can be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are wrapped in a U-shape or a curved shape along the circumference of the leg of the wearer, and this is a portion into which the wearer's leg is put. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(Exterior body)
The

exterior bodies

12F and 12B include a front exterior body 12F that is a part constituting the front body F and a rear exterior body 12B that is a part constituting the rear body B. The front exterior body 12F and the rear exterior body 12B Are not continuous on the leg side and are spaced apart. This separation distance 12d can be about 150 to 250 mm. Although not shown, a part of the exposed portion of the back surface of the interior body 200 in the separated portion (for example, the entire portion in the front-rear direction of the portion exposed between the front exterior body 12F and the rear exterior body 12B, The crotch portion cover sheet made of a nonwoven fabric or the like can be attached so as not to extend to the end and to cover the entire width direction side edges of the interior body 200. Moreover, as shown in FIG.9 and FIG.10, the exterior body 12 can also be made into the integral thing which continues between crotches from the front body F to the back body B. That is, the

exterior bodies

12F and 12B that individually configure the front body F and the back body B correspond to the former form, and the exterior body 12 that integrally configures the front body F and the back body B corresponds to the latter form. .

The

exterior bodies

12F and 12B have a waistline portion that is a longitudinal range corresponding to the waistline region T. In this embodiment, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a collar cover portion 14 that extends from the waist region T to the intermediate region L side. is doing. Although not shown, the front exterior body 12F is also provided with a collar cover portion that extends from the waistline region T toward the intermediate region L, a configuration that does not provide a collar cover portion while providing a groin cover portion, and the front exterior body 12F and It is not necessary to provide a portion corresponding to the intermediate region L in both of the rear exterior bodies 12B. Further, in the illustrated embodiment, the lower edge of the buttock cover portion 14 is formed in a straight line shape along the width direction, similarly to the lower edge of the front exterior body 12F, but is positioned on the waist opening side toward the outer side in the width direction. It can also be a curve that becomes

As shown in FIGS. 2 to 5, the

exterior bodies

12F and 12B have front and back surfaces formed by the outer sheet layer 12S and the inner sheet layer 12H. As shown in FIG. 5, the outer sheet layer 12S and the inner sheet layer 12H are formed by folding one sheet material so that the crease is positioned on the waist opening side, as shown in FIG. It can also be formed by bonding sheet materials. In addition, at least one of the outer sheet layer 12S and the inner sheet layer 12H may be formed of a sheet material that is partly different from other parts.

The sheet material used for the outer sheet layer 12S and the inner sheet layer 12H can be used without particular limitation as long as it is a sheet, but is preferably a non-woven fabric. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. However, when forming the sheet | seat junction part 20 by welding, the nonwoven fabric which consists of an olefin fiber is suitable. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. In particular, from the viewpoint of flexibility, a spunbonded nonwoven fabric of polypropylene fibers is suitable for the outer sheet layer 12S and the inner sheet layer 12H. Of course, different sheet materials can be used for the outer sheet layer 12S and the inner sheet layer 12H.

When a nonwoven fabric is used, the fineness is preferably about 1 to 3 dtex, and the basis weight is preferably about 10 to 30 g / m ² . Therefore, the total basis weight of the nonwoven fabric used for the

exterior bodies

12F and 12B is preferably about 20 to 60 g / m ² . Also, the average surface friction coefficient MIU of nonwoven fabric based on KES method (Kawabata's Evaluation System for Fabrics) is 0.30 or less, especially 0.05-0.20 (both MD and CD), and fluctuation deviation MMD of surface friction coefficient Is 0.01 or less, especially 0.003 to 0.008 (both MD and CD), and the thickness at a load of 0.5 g / cm ² is 0.05 to 0.25 mm, especially 0.10 to 0.20 mm. Is preferred. MIU and MMD can be measured by a friction tester KES-SE manufactured by Kato Tech Co., Ltd.

The

exterior bodies

12F and 12B have a continuous stretchable region A3 continuous in the width direction on the waist opening side with respect to the absorber 56, and are provided in the widthwise middle in the front-rear direction range including the absorber 56. It has a stretchable area A1 and an intermittent stretchable area A2 provided on both sides of the non-stretchable area A1 in the width direction, and between the outer sheet layer 12S and the inner sheet layer 12H in the continuous stretchable area A3 and the intermittent stretchable area A2. The elastic elastic members 19 (15 to 18), such as rubber thread, are attached at a predetermined elongation rate along the width direction, and can be expanded and contracted in the width direction (the width direction is the expansion and contraction direction). As the elongated elastic elastic member 19, synthetic rubber or natural rubber may be used. About a part or all of the front-rear direction range having the non-stretchable region A1 and the intermittent stretchable region in the illustrated form, the continuous stretchable region A3 is formed over the entire width direction, or the front-rear direction range of the non-stretchable region A1 in the illustrated form is the waist side or crotch You may enlarge to the side.

The illustrated embodiment will be described in more detail. First, a plurality of elastic elastic members of the waist part are formed between the outer sheet layer 12S and the inner sheet layer 12H in the waist part W of the

exterior bodies

12F and 12B so as to be continuous over the entire width direction. 17 is attached in a state where it is extended along the width direction at a predetermined extension rate with an interval in the front-rear direction. Among the waist elastic elastic members 17, one or more disposed in the region adjacent to the waist lower part U may overlap with the interior body 200, or may be overlapped with the interior body 200. May be provided on both sides in the width direction except for. The waist elastic elastic member 17 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. It is preferable to attach thread rubber of about 0 mm ² ) at an interval of about 5 to 20 mm, particularly about 8 to 16 mm, and about about 3 to 22 at an elongation of about 150 to 400%, particularly about 220 to 320%. Further, the waist elastic elastic member 17 does not need to have the same thickness and elongation rate. For example, the thickness and elongation rate of the elastic elastic member may be different between the upper portion and the lower portion of the waist portion W.

In addition, between the outer sheet layer 12S and the inner sheet layer 12H in the waist lower part U of the

exterior bodies

12F and 12B, except for the non-stretchable region A1, the entire region in the width direction is continuously provided on the upper side and both sides in the width direction. As shown in the figure, a plurality of waist lower elastic

elastic members

15, 18 made of an elongated elastic elastic member are attached in a state where the elastic

elastic members

15, 18 are extended in the width direction at a predetermined extension rate at intervals in the front-rear direction. ing. The waist lower

elastic members

15 and 18 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1. the rubber thread ^1-2 about 1.0mm), 5 ~ 20mm, 5 ~ 30 present approximately at intervals of particular 8 ~ 16 mm, respectively elongation 200 to 350%, especially preferably mounted at approximately 240 to 300 percent.

Further, between the outer sheet layer 12S and the inner sheet layer 12H in the buttock cover part 14 of the rear exterior body 12B, except for the non-stretchable region A1, it is continuous over the entire width direction at each part on both sides in the width direction. In addition, a plurality of cover elastic elastic members 16 made of an elongated elastic elastic member are attached in a state of being extended along the width direction at a predetermined extension rate with a space in the front-rear direction. The cover elastic member 16 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. It is preferable to attach thread rubber of about 0 mm ² ) at an interval of 5 to 20 mm, particularly 8 to 16 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%. In the case where an inguinal cover is provided on the front exterior body 12F, a cover elastic member can be provided in the same manner.

In addition, like the intermittent expansion-contraction area | region A2 of illustration form, the elastic expansion-contraction member 19 (in the illustration form waist lower part elastic expansion-

contraction members

15, 18 and cover part elastic expansion-contraction member 16) provided in

exterior body

12F, 12B is non-expanding / contracting. When provided on both sides in the width direction except for the area A1, the absorbent body 56 is prevented from contracting in the width direction in the non-stretchable area A1. Therefore, the non-stretchable region A1 is a region in the middle in the width direction (preferably including the entire inner / outer fixing portion 201) including part or all of the portion overlapping the absorber 56 in the width direction, and the side on both sides in the width direction. It is preferable that the entire width direction up to the seal portion 12A is an intermittent expansion / contraction region A2.

(Fixed part of elastic elastic member)
As shown in FIG. 2, FIG. 9, FIG. 11 to FIG. 14 and the like, the elastic stretchable member 19 in the continuous stretchable region A3 and the intermittent stretchable region A2 has an outer sheet layer 12S and an inner sheet layer 12H at both ends in the width direction. The fixed end portion 19f is fixed to the outer sheet layer 12S and the inner sheet layer 12H is a free portion 19m that is not fixed to the fixed end portion 19f. A free portion 19m of the elastic expansion / contraction member 19 freely expands and contracts in the width direction, and can freely move in the front-rear direction (direction orthogonal to the expansion / contraction direction) in a space between the sheet joining portions 20 described later. Yes. That is, in the case of the elastic elastic members 19 provided on both sides in the width direction except for a part or all of the portions overlapping the interior body 200 in the

exterior bodies

12F and 12B as in the illustrated embodiment, In the case of the elastic elastic member 19 that is continuous over the entire width direction of the

exterior bodies

12F and 12B, both end portions of each elastic elastic member 19 are fixed end portions 19f, and the width of the

exterior bodies

12F and 12B in the elastic expansion and contraction member 19 The portions located at both ends in the direction are fixed end portions 19f.

The fixing end 19f is not limited as long as the elastic elastic member 19 is fixed to the outer sheet layer 12S and the inner sheet layer 12H, and any known means can be used. It is preferable to use an adhesive H1. When the hot melt adhesive H1 is used, it is applied only to the end portion of each elastic elastic member 19 as shown in FIGS. 2, 9, 11, 13, and 14, and a plurality of hot melt adhesives H1 as shown in FIG. It can also apply | coat with the application | coating pattern continuous in the front-back direction so that the edge part of the elastic elastic member 19 may be covered. The hot melt adhesive H1 for fixing the fixed end portion 19f is applied to at least one of the outer sheet layer 12S and the inner sheet layer 12H, and is applied only to the end portion of each elastic elastic member 19. Alternatively, the hot melt adhesive may be applied only to the outer peripheral surface of the portions that are both ends of the elastic stretchable member 19 by an application means such as a comb gun or a sure wrap nozzle.

The fixed end 19f located on the side seal portion 12A side is desirably adjacent to the side seal portion 12A as shown in the figure, but can also be separated from the side seal portion 12A toward the center in the width direction.

(Sheet joint in the stretchable region)
As shown in FIGS. 2, 5, 9, and 11 to 14, at least in the region between the fixed end portions MA (the width direction region between the fixed end portions), each is continuous in the width direction and intersects with each other. The outer sheet layer 12 S and the inner sheet layer 12 H are bonded via the hot melt adhesive H 2 at a plurality of linear sheet bonding portions 20 arranged in the orthogonal direction without any problem.

For example, as in the conventional embodiment shown in FIG. 17, when a portion without the sheet bonding portion 20 continues in a direction perpendicular to the expansion / contraction direction (the front-rear direction in the illustrated embodiment), two sheets are formed at the portion without the sheet bonding portion 20. While the

layers

12S and 12H swell away from each other, as shown in FIGS. 15 and 16, if the two

sheet layers

12S and 12H are integrated as a whole, the

layers

12S and 12H have a wavy shape along each other. . From such a viewpoint, as shown in the figure, the sheet bonding portion 20 is continuous in the width direction in the region between the fixed ends. The portion where the sheet joining portion 20 is continuous in the width direction may extend over the entire width direction of the

exterior bodies

12F and 12B. However, if it is other than the fixed end portion region MA, it is partially or entirely fixed end portion region MA. The sheet joining portion 20 that continues from the above may not be formed.

In the stretch regions A2 and A3 of the

exterior bodies

12F and 12B configured as described above, the sheet joining portion 20 is continuous in the stretch direction. Therefore, as shown in FIG. 16, in the natural length state, the two sheet layers 12S. , 12H are deformed only along each other. As a result, in the fully expanded state, the two

sheet layers

12S and 12H are flat without wrinkles, but the two elastic layers 19S, 12S, In a state where 12H is contracted, wrinkles 80 are formed on both the front and back surfaces in a wavy shape in which the two

sheet layers

12S and 12H are along each other. A portion indicated by a two-dot chain line in FIG. 16D is a portion forming an opposite-facing ridge 80 adjacent to the ridge 80 of the portion indicated by a solid line.

As shown in FIG. 16, when the two

sheet layers

12S and 12H are wavy so as to be along each other, the conventional improvement in rigidity due to the number of sheet layers and the difference in curvature between the two

sheet layers

12S and 12H As a result of bending more gently than the top of the heel 80 (particularly, the difference from the conventional one becomes significant in the natural length state), the touch is smooth, and it is easily crushed in the thickness direction, thereby improving the touch flexibility. In addition, when the two

sheet layers

12S and 12H have a gentle wave shape along each other, the wave peaks and peaks and the valleys and valleys are separated in the expansion and contraction direction, so that when the waves are collapsed in the thickness direction or collapsed It is thought that the action of supporting the mountains and waves of the waves and the valleys and valleys is weakened, and the touch is also more flexible in this respect.

In addition, when picking a smooth material from the front and back with fingers, it is easier to feel smoothness by picking two layers of the same material rather than one. This is because the frictional resistance between the materials is lower than the frictional resistance between the fingers or between the fingers and the material, so that the frictional resistance can be felt low (smoothly) when picking up two sheets. . If the two sheet layers are along each other, it is considered that this slip feeling can be strongly felt. Therefore, it is preferable that the friction characteristics of the sheet material used for the two

sheet layers

12S and 12H are as described above.

The line shape of the sheet bonding portion 20 (in other words, the application pattern of the hot melt adhesive H2) can be determined as appropriate. In addition to the linear shape as shown in FIGS. 11 and 13, as shown in FIGS. It may be a wavy shape (in addition to a curved shape as shown in the drawing, including a triangular wave shape or a rectangular wave shape), or may be another regular or irregular curved shape. Further, as shown in the drawing, it is preferable that all the sheet joining portions 20 arranged in the front-rear direction at the same width direction position have the same linear shape, but it is also possible to combine the sheet joining portions 20 having different linear shapes. Moreover, it is preferable that all the sheet | seat joining parts 20 are made into the same linear shape in one diaper, However, The sheet | seat joining parts 20 of a different linear shape can also be combined.

Although the line width 20z of the sheet joint portion 20 can be determined as appropriate, it is equal to the application width of the hot melt adhesive H2, and therefore it is desirable that the width is usually about 0.5 to 2.0 mm in consideration of versatility. .

The front-rear direction interval 20s (the minimum value when the interval is not constant) between the sheet joining portions 20 adjacent to each other in the front-rear direction can be appropriately determined. However, if the width is too narrow, the flexibility is impaired. Since the unity of 12S and 12H is lowered, it is preferably about 3 to 10 mm in normal cases.

When the sheet joint portion 20 is provided linearly along the stretch direction, when the hot melt adhesive H2 is applied to the passing position of the elastic stretch member 19 to provide the sheet joint portion 20, the elastic stretch member 19 is continuous in the stretch direction. 11 and 13, as shown in FIG. 11 and FIG. 13, a free part area FA (a hatched area in FIG. 11) defined as an area between the free parts 19m of the elastic elastic members 19 adjacent in the front-rear direction. (It is omitted in other figures.)

In particular, when the stretchable areas A2 and A3 are in the unfolded state and the sheetless joining area 21 that does not have the sheet joining part 20 is continuous in the width direction at both ends in the front-rear direction in each free part area FA, elastic stretching The free part 19m of the member 19 can move freely in the front-rear direction (the direction orthogonal to the expansion / contraction direction) up to the region having the sheet joint part 20, and is preferable because the expansion / contraction structure has excellent fit. That is, as shown in FIGS. 11 and 13, in the deployed state, the elastic stretchable member 19 and the sheet joint portion 20 are separated in the front-rear direction over the entire width direction, but the elastic stretchable member 19 is adjacent to the sheet joint portion 20. Since it is movable in the front-rear direction, a part of the middle of the elastic elastic member 19 may move in the front-rear direction and come into contact with the sheet joint portion 20 in a normal mounting state or a natural length state. The length in the front-rear direction of the non-sheet joining region 21 can be determined as appropriate, but is preferably 10 to 49%, particularly 25 to 49% of the front-rear direction interval 19d between the fixed end portions 19f adjacent in the front-rear direction. The typical length is 2 to 12 mm, particularly 4 to 9 mm.

In the case of the linear sheet joining portion 20, it is desirable that one sheet joining portion 20 is provided in each of the free inter-regions FA adjacent in the front-rear direction as shown in FIGS. You can also. On the contrary, the linear sheet joining portions 20 do not have to be provided in each of the free portion areas FA adjacent to each other in the front-rear direction. Therefore, as shown in FIG. Can do.

Further, in the case of the straight sheet joining portion 20, the total dimension in the front-rear direction occupying the free inter-region FA (the line of the sheet joining portion 20 when there is one sheet joining portion 20 located in the free inter-region FA. It is equal to the width 20z, and in the case of a plurality of sheets, it is equal to the number of line widths 20z of the sheet joint portion 20). 10 to 40% of the (direction interval), particularly 15 to 30% is preferable, and the specific length is preferably 0.5 to 2.0 mm.

As shown in FIG.12 and FIG.14, when making the sheet | seat junction part 20 into a wavy line shape, it is preferable to make the wavy line sheet | seat junction part 20 into the area | region between the free part adjacent to the front-back direction (it is preferable to be 3 or more) It can have a wave height over FA. In this case, the sheet joining portion 20 intersects the elastic elastic member 19, and the two

sheet layers

12S and 12H are joined at the intersecting portion, but only intermittently joined in the stretching direction. Since the joint area is extremely small, hardening due to shrinkage hardly poses a problem. In particular, as in the illustrated example, when the number of the sheet joint portions 20 provided in the region where the free inter-regions FA are arranged is smaller than the number of the free inter-regions FA arranged in the front-rear direction, the shape is linear. Two

sheet layers

12S and 12H can be widely integrated in the orthogonal direction with a smaller amount of hot melt adhesive H2 than the case, and the sheet layers 12S and 12H can be effectively lifted and wrinkles and bulges caused thereby. Can be prevented. Of course, similarly to the linear sheet bonding portion 20, one or a plurality of wavy sheet bonding portions 20 are provided in the free inter-area FA so that the sheet bonding portion 20 does not intersect the elastic elastic member 19. You can also. In addition, the wavy sheet joining portion 20 may not be provided in each of the free inter-areas FA, and thus can be provided every other area.

The wave height 20H of the wavy sheet joint portion 20 can be determined as appropriate, but the wave height 20H is 50 to 300 of the front-rear direction interval 19d (ie, the front-rear direction interval of the elastic elastic member 19) of the fixed end portion 19f adjacent in the front-rear direction. %, Particularly preferably 120 to 250%, and a specific length is preferably 5 to 30 mm. The wavelength 20L of the wavy sheet-bonded portion 20 (the length of the repeated portion in the expansion / contraction direction) can be determined as appropriate, but is usually preferably 10 to 50 mm.

(Formation of non-stretchable area)
In the non-stretchable region A1, the elastic stretchable member 19 is supplied between the inner sheet layer 12H and the outer sheet layer 12S, and the fixed end 19f of the elastic stretchable member 19 is hot-melted at the end of the region that is the intermittent stretchable region A2. After being fixed by the adhesive H1, the elastic elastic member 19 is cut by pressing and heating at one or a plurality of positions in the middle in the width direction in the region to be the non-expandable region A1, or the elastic

elastic members

15, 16 , 19 are cut into pieces by pressing and heating, and the non-stretchable region A1 can be constructed by killing the stretchability while leaving the stretchable property in the intermittent stretchable region A2.

FIG. 19A shows a case in which the elastic elastic member 19 is cut at one place in the middle in the width direction, and a pressing portion 71 having a cutting projection 72 at one place in the circumferential direction is provided on the outer peripheral surface. The elastic elastic member 19 is attached between the inner sheet layer 12H and the outer sheet layer 12S by a seal roll 70 in which the cutting projection 72 is heated to a desired temperature and an anvil roll 80 having a smooth surface disposed opposite thereto. The elastic stretchable member 19 is cut by pressurizing and heating only the portion sandwiched between the cut object 72 and the outer peripheral surface of the anvil roll 80. In the product subjected to such processing, as shown in FIGS. 20A and 20B, the elastic elastic member 19 in the intermittent elastic region A2 is provided between the outer sheet layer 12S and the inner sheet layer 12H in the non-elastic region A1. From this, only the remaining cutting portion remains as the unnecessary elastic elastic member 18, and only one melt mark 22 remains as a cutting trace. Although not shown, when cutting at a plurality of places, a seal roll 70 having cutting projections 72 at a plurality of places in the circumferential direction may be used.

FIG. 19B shows a case where almost the entire elastic elastic member 19 is finely cut. The pressurizing portion 71 having a large number of cutting projections 73 that are intermittently arranged in a zigzag shape is provided on the outer peripheral surface. The elastic elastic member 15 is provided between the inner sheet layer 12H and the outer sheet layer 12S by a seal roll 70 in which the cutting projection 72 is heated to a desired temperature and an anvil roll 80 having a smooth surface disposed opposite thereto. The elastic expansion / contraction member 19 is cut by pressing and heating only the portion sandwiched between the cutting projection 73 and the outer peripheral surface of the anvil roll 80 with the cutting object attached with ˜17 and 19 attached. In the product subjected to such processing, as shown in FIG. 20C, the elastic stretchable member 19 in the intermittent stretch region A2 is continuous between the outer sheet layer 12S and the inner sheet layer 12H in the non-stretch region A1. The cutting remainder and the cut pieces of the elastic elastic member that are not continuous with the elastic elastic member 19 in both the intermittent elastic regions A2 remain intermittently in the front-rear direction and the width direction as the unnecessary elastic elastic member 18, and the melted trace 22 becomes the cutting trace. It remains intermittently in the front-rear direction and the width direction.

(Sheet joint in non-stretchable region)
Although it is not necessary to provide the sheet bonding portion 20 in the non-stretchable region A1, it is not preferable that the outer sheet layer 12S is displaced or floats with respect to the inner sheet layer 12H. Therefore, the sheet bonding portion 20 is provided. preferable. The sheet joining portion 20 in the non-stretchable region is not particularly limited as long as the two

sheet layers

12S and 12H are joined, but as shown in FIGS. 2, 6, 20, etc., the non-stretchable region A1 Then, the unnecessary elastic elastic member 70 is not fixed to the two

sheet layers

12S and 12H, and the two

sheet layers

12S and 12H are formed by the sheet bonding portion 20 on both sides in the front-rear direction of the unnecessary elastic elastic member 70. Are preferably joined. As described above, when the unnecessary elastic elastic member 70 is not fixed to the two

sheet layers

12S and 12H, the contraction force of the unnecessary elastic elastic member 70 is completely applied to the two

sheet layers

12S and 12H. It can be set as the state which does not act on. Further, in the non-stretchable region A1, the two

sheet layers

12S and 12H are joined by the sheet joint portion 20 on both sides in the front-rear direction of the unnecessary elastic stretch member 70, and the movement of the unnecessary elastic stretch member 70 in the front-rear direction is the same. Since it is limited between the sheet | seat junction parts 20 located in the front and back both sides, the big movement which looks worse is prevented. Of course, the unnecessary elastic stretchable member 70 in the non-stretchable region A1 may be fixed to the two

sheet layers

12S and 12H with a hot melt adhesive. As shown in FIGS. 20A and 20B, when the elastic elastic member 19 is cut at one place (or a plurality of places) in the middle in the width direction, the amount of hot melt adhesive applied so as to reduce the adhesive force. Adjust. When the elastic stretchable member 19 is cut finely as shown in FIG. 20C, the stretchability of the non-stretchable region A1 can be almost killed even if the adhesive force is high.

The sheet joint portion 20 in the non-stretchable region A1 can be basically the same as the sheet joint portion 20 in the intermittent stretch region A2. The shape, size, number, arrangement, and the like of the sheet joint portion 20 in the non-stretchable region A1 may be different from those of the sheet joint portion 20 in the intermittent stretch region A2. For example, the number of sheet joint portions 20 in the non-stretchable region A1 is made larger than the number of sheet joint portions in the intermittent stretch region A2, and the distance between the unnecessary elastic stretch member 70 and the sheet joint portion 20 is narrowed in the non-stretchable region A1. By doing so, the unnecessary elastic elastic member 70 can be effectively prevented from moving, and in the intermittent elastic region A2, the flexibility can be emphasized, and the elastic elastic members 19 can be arranged in a row as shown in FIG. it can.

However, from the viewpoint of manufacturing ease and manufacturing stability, as shown in FIG. 2, FIG. 6, FIG. 20, and the like, the shape, size, number, arrangement, and the like of the sheet joint portion 20 in the non-stretchable region A1 are intermittent. It is desirable to be the same as the sheet joining portion 20 in the stretchable region A2, and at least the sheet joining portion 20 in the intermittent stretchable region A2 and the sheet joined portion 20 in the non-stretchable region A1 are preferably continuous in the width direction.

In this case, when the sheet joining portion 20 is linear, the space between the two

sheet layers

12S and 12H in the intermittent expansion / contraction region A2 is continuous with the space between the two

sheet layers

12S and 12H in the non-extension / contraction region A1. That is, the unnecessary elastic elastic member 70 may move to the intermittent expansion / contraction region A2 side. Accordingly, the fixed end portion 19f of the elastic expansion / contraction member 19 in the intermittent expansion / contraction region A2, at least at the end portion on the center side in the width direction, is continuously hot throughout the entire front / rear direction of the intermittent expansion / contraction region A2, as shown in FIGS. It is also a preferable form that the two

sheet layers

12S, 12H are formed over the entire front-rear direction of the intermittent expansion / contraction region A2 by forming with a melt adhesive. Thereby, since the space between the two

sheet layers

12S and 12H in the non-stretchable region A1 is closed on both sides in the width direction of the non-stretchable region A1, the unnecessary elastic stretchable member 70 moves to the intermittent stretchable region A2 and looks good. Deterioration can be prevented.

Further, when the sheet joint portion 20 in the non-stretchable region A1 is formed in a wavy shape arranged so as to intersect the unnecessary elastic stretch member 70, the movement of the unnecessary elastic stretch member 70 toward the intermittent stretch region A2 is blocked by the sheet joint portion 20. Therefore, it is possible to prevent the unnecessary elastic elastic member 70 from moving to the intermittent expansion / contraction region A2 and deteriorating the appearance. In particular, when the unnecessary elastic elastic member 70 is fixed to the two

sheet layers

12S and 12H by the hot melt adhesive of the sheet joining portion 20, the movement of the unnecessary elastic elastic member 70 can be surely prevented, and the appearance is particularly good. It becomes.

The other details of the sheet joint portion 20 in the non-stretchable region A1 are the same as those of the sheet joint portion 20 in the stretchable regions A2 and A3, and thus description thereof is omitted here.

(Hot melt adhesive)
Examples of hot melt adhesives H1 and H2 used for the outer package 12 include EVA, adhesive rubber (elastomer), olefin, and polyester / polyamide, and can be used without any particular limitation. In particular, the holding force of the hot melt adhesive H1 (hereinafter referred to as the first hot melt adhesive) that fixes the fixed end of the elastic elastic member to the two sheet layers is linear in the region between the fixed ends. A material having a higher holding force than the hot melt adhesive H2 (hereinafter referred to as the second hot melt adhesive) for forming the sheet bonding portion is preferable. In particular, the holding power of the first hot melt adhesive H1 is preferably more than 120 minutes, and the holding power of the second hot melt adhesive H2 is preferably 30 to 90 minutes.
In general, since the hot melt adhesive having a high melt viscosity has high holding power, the melt viscosity of the first hot melt adhesive H1 is desirably higher than the melt viscosity of the second hot melt adhesive H2. Specifically, the first hot melt adhesive H1 preferably has a melt viscosity of 10,000 to 40,000 mPa · s at a temperature of 140 ° C. and a melt viscosity of 5,000 to 10,000 mPa · s at a temperature of 160 ° C. The second hot melt adhesive H2 preferably has a melt viscosity of 3,000 to 7,000 mPa · s at a temperature of 140 ° C. and a melt viscosity of 1,000 to 4,000 mPa · s at a temperature of 160 ° C.
Further, since the hot melt adhesive having a high loop tack adhesive strength is suitable for bonding non-woven fabrics, the loop tack adhesive strength of the second hot melt adhesive H2 is higher than the loop tack adhesive strength of the first hot melt adhesive H1. Is also desirable. Specifically, the first hot melt adhesive H1 preferably has a loop tack adhesive strength of 10 to 500 g / 25 mm, and the second hot melt adhesive H2 has a loop tack adhesive strength of 1,000 g / 25 mm or more. preferable.
Furthermore, it is more preferable that the peel strength of the first hot melt adhesive H1 is 100 cN / 25 mm or more in both length and width and the peel strength of the second hot melt adhesive H2 is 100 cN / 25 mm or more in both length and width.
The first hot melt adhesive H1 and the second hot melt adhesive H2 that satisfy such requirements can be easily obtained from a hot melt adhesive manufacturer.

(Interior body)
The shape and structure of the interior body 200 are not particularly limited, and for example, the shape and structure described below can be adopted. The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a liquid-permeable top sheet 30 on the skin side of the wearer, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. It is a main-body part which bears an absorption function. Reference numeral 40 indicates an intermediate sheet (also referred to as a second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Reference numeral 60 denotes a portion that extends along both widthwise sides of the absorption surface of the interior body and rises around the legs of the wearer in order to prevent excrement from leaking to both sides of the interior body 200. A certain leg gather 60 is shown.

(Top sheet)
The top sheet 30 can be used without particular limitation as long as it is a liquid-permeable material such as a perforated or non-porous nonwoven fabric or a porous plastic sheet. A non-woven fabric is used when serving also as a covering material for the liquid-impermeable sheet 64 of the surrounding gathers 60. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

In the case where both sides in the width direction of the top sheet 30 do not serve as the covering material for the liquid-impermeable sheet 64 of the leg gathers 60, for example, as shown in FIGS. In order to prevent the liquid from penetrating through the gap to the back side of the absorbent element 50, it can be adhered to the liquid-impermeable sheet 11 and the leg-around gather 60 with a hot melt adhesive or the like.

(Intermediate sheet)
As shown in FIGS. 7 and 8, an intermediate sheet (also called “second sheet”) 40 that is more hydrophilic than the top sheet can be provided on the back side of the top sheet 30. The intermediate sheet 40 is for preventing a reverse return phenomenon of the absorbed liquid from the absorber and ensuring a smooth touch on the top sheet 30. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably 20 ~ 80g / m ^2, more preferably 25 ~ 60g / m ^2. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

The intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbent body 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

(Liquid impervious sheet)
Although the raw material of the liquid-impermeable sheet 11 provided in the back side of the absorber 56 is not specifically limited, For example, the plastic film which consists of olefin resin, such as polyethylene and a polypropylene, can be illustrated. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used.

As shown in FIGS. 3 and 4, the liquid-impermeable sheet 11 extends to the side of the absorbent body 56 and also serves as the liquid-permeable film 64 in the leg circumference gather 60. As shown in FIGS. 7 and 8, the width of the absorbent element 50 is set to the back side, or both sides of the absorbent element 50 in the width direction are extended so as to extend to both sides of the side surface of the top sheet 30 of the absorbent element 50. Can be.

Further, an excretion indicator whose color is changed by absorption of the liquid component can be provided on the inner side of the liquid-impermeable sheet 11, particularly on the side of the absorber 56.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be, for example, about 100 to 300 g / m ² when stacking cotton-like pulp or short fibers, and about 30 to 120 g / m ² for filament aggregates, for example. Can do. The fineness in the case of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

Although the absorbent body 56 may be rectangular, as shown in FIG. 6, as shown in FIG. 6, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. The shape is preferable because the fit of the absorbent body 56 and the leg gathers 60 around the legs is improved.

Further, the size of the absorber can be determined as appropriate, but it preferably extends to the peripheral edge of the interior body or the vicinity thereof in the front-rear direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The proportion of particles remaining on the sieve is preferably 30% by weight or less, and the proportion of particles remaining on the sieve by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006). Is preferably 60% by weight or more.

The material for the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption (JIS K7223-1996 “Test method for water absorption of superabsorbent resin”) of 40 g / g or more are suitable. Superabsorbent polymer particles include starch, cellulose and synthetic polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose cross-link. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the liquid supplied into the absorbent body 56 tends to cause a so-called reversal that returns to the outside of the absorbent body 56.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generally stated, it can be 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

If necessary, the content of the superabsorbent polymer particles can be changed in the plane direction of the absorber 56. For example, the liquid excretion site can be made higher in content than other sites. When gender differences are taken into account, males can increase the front content, and females can increase the central content. In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, a liquid permeable material such as tissue paper, particularly a crepe paper, a nonwoven fabric, a polylaminated nonwoven fabric, or a sheet having small holes can be used as the material. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 20 g / m ² , particularly 8 to 15 g / m ² .

The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edge portions protrude from the front and rear sides of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Gather around the legs)
The leg gathers 60 are portions that extend along the widthwise sides of the absorption surface of the interior body 200 and rise toward the wearer's legs, and move in the lateral direction along the top sheet 30. It is provided to block soft stools and prevent side leakage.

As shown in FIG. 3 and FIG. 4, the leg-around gather 60 of this embodiment includes an inner nonwoven fabric layer 61 that constitutes an inner surface in the width direction, an outer nonwoven fabric layer 62 that constitutes an outer surface in the width direction, and an intermediate in the front-rear direction. The gather elastic elastic member 63 provided along the front-rear direction between the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 at least at the distal end portion, and the inner nonwoven fabric over a range from the proximal end to the distal end side position relative to the proximal end. A liquid-impermeable sheet 64 (11) sandwiched between the layer 61 and the outer nonwoven fabric layer 62. In the illustrated embodiment, the inner non-woven fabric layer 61 is present in the leg gathers 60 having the liquid-impermeable sheet 64 and the base end side of the leg gathers 60 over the entire front and rear direction of the leg gathers 60. The non-woven fabric nonexistent portion 65 from which the liquid impermeable sheet 64 is exposed is used. Thus, the amount of nonwoven fabric used can be reduced by providing the leg-gathered gather 60 with the non-woven fabric non-existing portion 65 without the inner nonwoven fabric layer 61. Moreover, since the front-end | tip part of the leg circumference gathers 60 is a part which contacts skin, by providing the nonwoven fabric non-existing part 65 avoiding there, the liquid-impermeable sheet 64 becomes difficult to contact skin, and the touch deteriorates. Can be suppressed.

In the form shown in FIGS. 1 to 6, the inner nonwoven fabric layer 61 is extended to the side of the top sheet 30, or the gathers 60 around the legs having the structure shown in FIGS. 7 and 8 are used. The entire sheet 64 may be hidden.

The gather elastic elastic members 63 may be provided only at the distal end portion of the leg-around gather 60, but a plurality of gather elastic stretch members 63 are provided at intervals in the direction from the tip of the leg-around gather 60 to the base end as shown in the figure. Is preferred. Usually, the number of gather elastic elastic members 63 is preferably 2 to 6, and the mutual interval 60d is preferably 3 to 10 mm. As described above, when a plurality of gather elastic elastic members 63 are provided at intervals, a portion between them is recessed outward. Therefore, when the non-woven fabric non-existing portion 65 is provided only at this interval portion as shown in the drawing, the nonwoven fabric is provided. The liquid-impermeable sheet 64 exposed to the nonexisting portion 65 is preferable because it is recessed and hardly comes into contact with the skin. In this case, as shown in FIGS. 1 to 6, the gather elastic elastic members 63 are provided at least at the distal end and the proximal end of the leg gather 60 at intervals of one or more. It is particularly preferable that the non-woven fabric non-existing portion 65 is provided only in the space between the gather elastic elastic member 63 and the gather elastic elastic member 63 at the tip.

The front-rear direction range in which the gather elastic elastic members 63 are provided in the leg gathers 60 can be the entire front-rear direction of the leg gathers 60, but is preferably less than or equal to the front-rear direction range of the rising portion.

Further, as long as the gather elastic elastic member 63 is provided between the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 (for this reason, it is not provided in the non-woven fabric non-existing portion 65), the liquid impermeability incorporated in the leg circumference gather 60 It is possible to provide the adhesive sheet 64 on the inner side as shown in FIGS. 3 and 7 or on the outer side although not shown.

The range in which the liquid permeable film 64 is provided may be from the base end to the intermediate position between the base end and the distal end as long as it is a range from the base end of the leg-around gather 60 to a position closer to the distal end than the base end. In order to sufficiently improve the water-blocking property, it is desirable to provide up to the tip portion, and in particular, as shown in FIGS. 3 and 4, it is slightly more than the tip portion (for example, a plurality of gathered elastic members. It is preferable to ensure the softness of the touch by not extending the liquid permeable film 64 at the tip portion until the position is about 30 mm apart.

Further, in the form in which the liquid-impermeable sheet 64 is exposed in the non-woven fabric non-existing portion 65, the liquid exposed to the non-woven fabric non-existing portion 65 in the portion 60 W that overlaps the front outer packaging body 12 F and the rear outer packaging body 12 B. There is a possibility that the impermeable sheet 64 may be pressed against the skin. However, as shown in FIGS. 1 to 6, the portion 60W is fixed to the front exterior body 12F and the rear exterior body 12B, and the elastic

elastic members

15 and 19 of the front exterior body 12F and the rear exterior body 12B. When the sheet 60 is contracted in the width direction, even if the liquid-impermeable sheet 64 is exposed, the contact area with the skin is remarkably reduced due to the contraction wrinkles, so that the influence on the touch is small. In the leg-gathered gather 60 of this form, the region between the fixed portions 60W with respect to the front exterior body 12F and the rear exterior body 12B is located at the base edge of the absorbent body 56 as the gather elastic elastic member 63 contracts. As shown by a two-dot chain line in FIG.

The member structure of the leg circumference gathers 60 is not particularly limited, and a known structure can be adopted. In the form shown in FIGS. 1 to 6, the top sheet 30 is made of a nonwoven fabric, and both sides in the width direction extend from the side edges of the absorbent body 56, and the back side of the absorbent body 56 has a nonwoven fabric. The gather sheet 66 is provided, and both sides in the width direction extend from the side edges of the absorber 56. Further, the side end portion of the gather sheet 66 is folded back, and the tip of the folded portion 66r is the top. The liquid impervious sheet 64 is provided between the top sheet 30 and the gather sheet 66 at least from the folded portion 66r of the gather sheet 66 while being separated from the front end of the sheet 30. As a result, the outer nonwoven fabric layer 62 is formed by a portion other than the folded portion 66r of the gather sheet 66, and the folded portion 66r of the gather sheet 66 and the portion extending to the side of the absorbent body 56 in the top sheet 30 The nonwoven fabric non-existing portion 65 is formed by the portion where the nonwoven fabric layer 61 is formed and the folded portion 66r of the gather sheet 66 and the top sheet 30 are separated from each other. In this way, when the inner nonwoven fabric layer 61 on the proximal end side of the non-woven fabric non-existing portion 65 in the leg circumference gathers 60 is formed by the top sheet 30 and the others are formed by the gather sheet 66, the nonwoven fabric is not required to cut the material. The non-existing portion 65 can be provided, and the structure thereof is very simple and easy to manufacture.

In this case, as shown in FIGS. 3 and 4, the liquid-impermeable sheet 64 of the leg gather 60 is passed from the leg gather 60 on one side to the back side of the absorber 56, and the leg gather 60 on the other side. It is preferable to extend to the leg gathers 60 as well as the water-proofing of the back side of the absorbent body 56, but it is preferable that the shape shown in FIGS. The liquid permeable film 64 to be incorporated in the leg gathers 60 and the liquid permeable film 11 covering the back side of the absorber 56 can be provided separately. In the latter case, the material of the liquid permeable film 64 incorporated in the leg-gathered gather 60 and the material 11 of the liquid permeable film covering the back side of the absorber 56 may be the same or different.

Similarly, the gather sheet 66 is also formed by an integral sheet from the one leg leg gather 60 to the other leg leg gather 60 through the back side of the absorbent body 56 as shown in FIGS. 3 and 4. It is preferable that an outer surface such as a cloth can be obtained without separately providing the above-described crotch cover sheet, but the gather sheet 66 and the crotch cover sheet as shown in FIGS. 12M may be provided individually.

As the structure of the other leg-around gather 60, as shown in FIGS. 7 and 8, an attachment portion 68 fixed to the back side of the interior body 200, and the side of the interior body 200 wraps around the attachment portion 68. The extending portion 69 extending to the side surface of the interior body 200 and the lying portion 69B formed by fixing both ends in the front-rear direction of the extending portion 69 to the side surface of the interior body 200 in a lying state. A free portion 69F formed by unfixing an intermediate portion between the lying portions of the extending portion, and a gather elastic expansion / contraction fixed in an extended state along the front-rear direction at least at the distal end of the free portion 69F What has the member 63 can also be employ | adopted. In the leg gathers 60, as the gather elastic elastic member 63 contracts, the free part 69F rises toward the leg around the boundary with the attachment part 68.

The extending portion 69 of the leg-around gather 60 in the form shown in FIGS. 7 and 8 includes a root side portion toward the center in the width direction and a tip side portion folded back outward in the width direction from the tip of the root side portion. However, it is also possible to adopt a form (not shown) consisting of only a portion toward the center in the width direction without being folded back in the width direction.

On the other hand, in the middle region in the front-rear direction which is the rising portion of the leg-around gather 60, various coating methods are used for bonding the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 and fixing the gather elastic elastic member 63 sandwiched therebetween. It is possible to use at least one of a hot melt adhesive and a fixing means by material welding such as heat sealing or ultrasonic sealing. When the entire surfaces of the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 are bonded together, flexibility is impaired. Therefore, it is preferable that portions other than the bonding portion of the gather elastic elastic member 63 are bonded or weakly bonded. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surface of the gather elastic elastic member 63 by an application means such as a comb gun or a sure wrap nozzle, and is sandwiched between the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62, thereby collecting the gather elasticity. With only the hot melt adhesive applied to the outer peripheral surface of the stretchable member 63, the elongate elastic stretchable member is fixed to the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62, and the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 are fixed. It has a structure to do.

Further, in the non-rising portions on both sides in the front-rear direction of the leg circumference gathers 60, the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 are bonded together, or the front exterior body 12F of the leg circumference gathers 60 in the form shown in FIGS. For fixing to the rear exterior body 12B and fixing the base side portion and the distal end side portion in the leg-around gather 60 in the form shown in FIGS. At least one of a hot melt adhesive by an application method and fixing means 67 by material welding such as heat sealing or ultrasonic sealing can be used. In the illustrated embodiment, the hot melt adhesive and the fixing means 67 by material welding are combined, but these can be fixed only by any one means.

The size of the leg gathers 60 can be determined as appropriate, but in the case of an infant paper diaper, the standing height of the leg gathers 60 (the distance in the width direction between the distal end and the proximal end in the unfolded state) is 15 to 60 mm, particularly 20 It is preferably ˜40 mm.

In each of the above embodiments, the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 are flexible, uniform and concealing nonwoven fabrics such as spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), melt blown nonwoven fabric, etc. In addition, if necessary, a material subjected to water repellency treatment with silicon or the like can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . In the form shown in FIGS. 3 and 4, the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 of the outer nonwoven fabric layer 62 are formed as the inner nonwoven fabric layer 61 on the proximal end side from the nonwoven fabric absent portion 65 is formed by the top sheet 30. It is also possible to make the materials partially different, and it is also possible to make the materials of the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 different.

In each of the above embodiments, the gather elastic elastic member 63 may be an elongated elastic elastic member such as a thread rubber or a belt rubber. When thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%.

In each of the above forms, the leg gathers 60 are provided in one row on each of the left and right sides, but a plurality of rows can be provided.

<Others>
(A) Although the material of the two

sheet layers

12S and 12H can be determined as appropriate, when the bending resistance in the expansion / contraction direction is higher than the bending resistance in the direction orthogonal to the expansion / contraction direction, the top of the ridge 80 is loose. It is preferable because it is easy to bend.
(B) Although it is preferable that the sheet bonding portions 20 are formed in each of the portions between the elastic elastic members 19 adjacent in the front-rear direction as illustrated, the sheet bonding portions 20 are formed every other line. May be. That is, it is desirable to arrange only one elastic expansion / contraction member 19 between the sheet joining parts 20 adjacent in the front-rear direction, but a plurality of elastic expansion / contraction members 19 may be arranged.
(C) The number of sheet joint portions 20 provided between the elastic elastic members 19 adjacent in the front-rear direction (one continuous portion) is one as shown in FIG. It is also possible to have a plurality.
(D) In the illustrated embodiment, the present invention is applied to the entire stretch structure in the width direction of the

exterior bodies

12F and 12B. However, the present invention is applied only to a part and the rest (for example, only the waist portion) is elastic. A known stretchable structure may be employed, such as applying a hot melt adhesive only to the outer peripheral surface of the elastic stretchable member 19 over the entire width direction of the stretchable member 19 and fixing it between the two

sheet layers

12S, 12H. In addition, the present invention can be applied to only one of the front exterior body 12F and the rear exterior body 12B.
(E) The above-described elastic structure of the present invention is not limited to pants-type disposable diapers, but also other elastic materials such as three-dimensional gathers and flat gathers that are widely used for tape-type disposable diapers around the waist, fastening tape, and absorbent articles. It can also be applied to parts.

<Explanation of terms in the specification>
When the following terms are used in the specification, they have the following meanings unless otherwise specified in the specification.
The “front / rear (vertical) direction” means a direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means a direction (left / right direction) orthogonal to the front / rear direction.
-"Developed state" means a state where the plate is flattened without contraction or slack.
“Elongation rate” means a value when the natural length is 100%.
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
“Thickness” is automatically measured using an automatic thickness meter (KES-G5 handy compression tester) under the conditions of load: 10 gf / cm ² and pressure area: 2 cm ² .
The water absorption is measured according to JIS K7223-1996 “Test method for water absorption of superabsorbent resin”.
・ "Water absorption rate" is "Time to end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent resin" is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. And
“Bending softness” means “8.21.1 A method (45 ° cantilever method)” of JIS L 1096: 2010 “Fabric and knitted fabric testing method”.
The “peel strength” of the hot melt adhesive is measured as follows. That is, ^two hydrophobic spunbond nonwoven fabrics 301 made of PP fibers having a fineness of 1.44 dtex and a basis weight of 17 g / m ² are prepared (each 100 mm or more in the MD direction × 75 mm or more in the CD direction). The hot melt adhesive 302 to be measured is continuously applied in the MD direction with an application width of 25 mm at a coating amount of 20 g / m ² , and the other non-woven fabric 301 is applied in the MD direction through the hot melt adhesive 302. After bonding together in the CD direction, a 2 kg roller is reciprocated once from above and bonded to make a nonwoven fabric bonded body 300 shown in FIG. Next, from this nonwoven fabric adhesive body 300, the longitudinal direction test piece 310 cut | disconnected by the cutting line shown by a dotted line in FIG. 20, and the whole surface was adhere | attached by MD direction 75mm x CD direction 25mm, MD direction 25mm x CD direction 75mm Then, a lateral test piece 320 having a non-adhesive portion 321 of 25 mm from both ends in the CD direction and an adhesive portion 322 of 25 mm in the MD direction × 25 mm in the CD direction therebetween is produced. And in the longitudinal direction test piece 310, as shown with a dashed-two dotted line in FIG. 20, both the nonwoven fabrics of the end part of 25 mm from one end of MD direction are peeled (The adhesive force of a target part is reduced by spraying a cold spray on a target part. 21) to form a gripping allowance 311. The gripping allowance 311 of each nonwoven fabric is gripped by the upper and lower grips of the tensile tester, and the gripping interval is 30 mm and the tensile speed is 300 mm / min. Thus, the remaining adhesive portion 312 is peeled off, and the tensile force (cN / 25 mm) required for the peeling is measured. In the lateral direction test piece 320, the test is performed in the same manner as the longitudinal direction test piece 310, except that the nonwoven fabrics of the non-adhesive portion 321 at one end in the CD direction are respectively gripped by the upper and lower grips of the tensile tester. Observe the fracture state of the exfoliated part, and at the time of interfacial fracture (interfacial debonding) and cohesive fracture, among the measurement curves with the vertical axis as the tensile force, from the wavy part after the start of exfoliation (after the curve has gone up) Five vertices and the first five bottom points are selected, and the average value of the tensile force at each point is taken as the measured value. In the case of material destruction (base material destruction), the maximum value of the tensile force is taken as the measurement value. The above measurement is carried out three times for each of the longitudinal direction test piece 310 and the transverse direction test piece 320, and the measured values of the three times are averaged to obtain the longitudinal peel strength and the transverse peel strength.
The “holding power” of the hot melt adhesive is measured as follows. That is, as shown in FIG. 22, a PET film having a thickness of 25 μm is prepared, and end portions in the longitudinal direction (portions from 25 mm from one end in the longitudinal direction) of two rectangular PET films 401 having a length of 100 mm × width of 25 mm are connected to each other. Then, the test piece 400 adhered through the hot melt adhesive layer 402 to be measured is prepared. The adhesion part 403 of the test piece 400 is 25 mm × 25 mm. The hot melt adhesive layer 402 is applied at a thickness of 20 g / m ² by slot coating, and after bonding, a 2 kg roller is reciprocated once from the top of the bonding portion 403 for pressure bonding. 23 ° C. for 16 hours, and as shown in FIG. 23, the PET film 401 at both ends of the test piece 400 is gripped by a gripper 404 that is tightened with screws in the thickness direction so that no force is applied to the adhesive portion 403. Then, leave in a creep tester (constant temperature bath) at 40 ° C. for 2 hours. Thereafter, as shown in FIG. 23, the creep tester suspends one gripping tool 404 upward, and suspends a weight 405 on the other gripping tool 404. The weight 405 and the weight-side gripping tool 405 total 1 kg A vertical load is applied, and the time from when the load is started until the adhesive portion 403 is completely peeled off and the PET film on the weight 405 side is peeled off is measured. The measurement is made up to 120 minutes, and when the weight does not fall by the lapse of 120 minutes, the measurement result is “over 120 minutes”. The above measurement is performed three times, and the average value of the measurement results is defined as the holding power (minutes). When the measurement result of 3 times includes 1 time exceeding 120 minutes and 2 times less than 120 minutes, the average value of the two measurement results of 120 minutes or less is used as the holding power, and the time exceeding 120 minutes is 2 times and 120 minutes. When the following occurs once, the measurement result of one time of 120 minutes or less is the holding force, and when all three times are more than 120 minutes, the holding force is more than 120 minutes.
“Loop tack adhesion” means a value measured as follows. That is, the hot melt adhesive is applied to a thickness of 50 μm on a PET plate having a thickness of 50 μm. This is cut into a size of 25 mm in width and 125 mm in length to form a tape, and then the two ends of the tape are overlapped to form a loop. This loop is fixed to an LT-100 type loop tack tester (manufactured by Chem Instrument Co., Ltd.) and then bonded to a PE (polyethylene) plate with an adhesive area of 25 mm × 25 mm and an adhesive time of 2 seconds. Next, the loop-shaped tape is peeled off at 20 ° C. at a peeling speed of 300 mm / min, and the maximum force is measured to obtain the loop tack adhesive force.
“Melt viscosity” is measured at a specified temperature using a Brookfield B-type viscometer (spindle No. 027) in accordance with JIS Z 8803.
・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ± 5 ℃, relative humidity 65% or less). .
-Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.

The present invention is suitable for a pants-type disposable diaper as in the above example, but can be applied not only to a tape-type or pad-type disposable diaper but also to absorbent articles such as sanitary napkins.

DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12A ... Side seal part, 12B ... Rear side exterior body, 12F, 12B ... Exterior body, 12F ... Front side exterior body, 12H ... Inner sheet layer, 12S, 12H ... Two sheet layers, 12S ... Outer sheet layer, 15, 18 ... Waist lower elastic member, 16 ... Cover elastic elastic member, 17 ... Waist elastic member, 19 ... Elastic elastic member, 19f ... Fixed end, 19m ... Free part, DESCRIPTION OF SYMBOLS 20 ... Sheet | seat junction part, 21 ... No sheet | seat joining area | region, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Gather around a leg, 61 ... Inner nonwoven fabric layer, 62 ... outer nonwoven fabric layer, 63 ... gather elastic elastic member, 64 ... liquid impervious sheet, 65 ... non-woven fabric non-existing portion, 66 ... gather sheet, 66r ... folded portion, 70 ... unnecessary bullet Stretchable member, 80 ... 襞, 200 ... interior body, 201 ... inner / outer fixed portion, A1 ... non-stretchable region, A2 ... intermittently stretchable region, A3 ... continuous stretchable region, FA ... free interregion, MA ... fixed end region , H1, H2 ... hot melt adhesives.

Claims

Two sheet layers extending in the expansion / contraction direction and the orthogonal direction orthogonal thereto, and a plurality of elongated elastic expansion / contractions extending along the expansion / contraction direction, spaced between the sheet layers in the orthogonal direction. And having a member
The elastic expansion / contraction member is a fixed end formed by fixing both ends of the expansion / contraction direction in the expansion / contraction region to the two sheet layers, and the two sheet layers are not connected between the fixed ends. It is a fixed free part, or an intermittently fixed part that is intermittently fixed in the expansion and contraction direction,
In the stretchable structure of an absorbent article, wherein the two sheet layers are joined to each other through a hot melt adhesive in a region between the fixed ends that is defined as a region between the fixed ends. ,
The sheet joining portions are continuous with each other in the expansion / contraction direction and are a plurality of linear sheet joining portions arranged in the orthogonal direction without intersecting each other,
An elastic structure of an absorbent article characterized by the above.
The elastic structure of an absorbent article according to claim 1, wherein the plurality of sheet joint portions have the same linear shape.
The sheet joint portion is provided in a straight line along the expansion / contraction direction without intersecting the elastic expansion / contraction member,
The elastic structure of the absorbent article according to claim 1.
The elastic elastic member is a free part that is not fixed to the two sheet layers between the fixed end parts,
3 or more elastic elastic members are provided at intervals in the orthogonal direction,
A plurality of free part regions defined as regions between the free parts adjacent in the orthogonal direction are provided adjacent to each other in the orthogonal direction;
The stretchable structure of an absorbent article according to claim 3, wherein the sheet joint portion is formed in each of the regions between the free portions.
5. The non-sheet joining region that does not have a sheet joining portion continues in at least both ends in the orthogonal direction in the region between the free portions in the unfolded state over the entire width direction of the region between the free portions. Elastic structure of absorbent articles.
The stretch structure of the absorbent article according to claim 1 or 2, wherein the linear sheet joint is formed in a wavy shape.
The elastic elastic member is a free part that is not fixed to the two sheet layers between the fixed end parts,
3 or more elastic elastic members are provided at intervals in the orthogonal direction,
A plurality of free part regions defined as regions between the free parts adjacent in the orthogonal direction are provided adjacent to each other in the orthogonal direction;
The sheet joint is formed so as to have a wave height over a plurality of the regions between the free parts adjacent in the orthogonal direction,
The number of the sheet joint portions provided in the region where the free part regions are arranged is smaller than the number of the free part regions arranged in the orthogonal direction.
The elastic structure of the absorbent article according to claim 6.
The elastic structure of an absorbent article according to any one of claims 1 to 7, wherein the two sheet layers have a higher bending resistance in the expansion / contraction direction than the bending resistance in the orthogonal direction.
An exterior body constituting a front body and a back body, and an interior body including an absorbent body attached to the inside of the exterior body, and both sides of the exterior body in the front body and both sides of the exterior body in the back body In a pants-type disposable diaper having side seal portions that are joined portions, and having an annular trunk periphery, a waist opening, and a pair of left and right leg openings,
The stretchable structure of the absorbent article according to any one of claims 1 to 8, wherein the stretchable direction is a width direction in a region including at least a portion of the exterior body that is located outside both side edges of the interior body. Provided to be,
A pants-type disposable diaper characterized by that.