JP7253912B2 - absorbent article - Google Patents

Description

TECHNICAL FIELD The present invention relates to an absorbent article having riser gathers on both sides in the width direction.

General absorbent articles such as disposable diapers and sanitary napkins have a crotch portion, a front portion positioned forward of the crotch portion, and a rear portion positioned rearward of the crotch portion. It has a basic structure including an absorbent body provided over the part, the crotch part, and the rear part, a liquid-permeable top sheet covering the front side of the absorbent body, and a liquid-impermeable sheet covering the back side of the absorbent body.

In addition, many absorbent articles generally have riser gathers that rise from both sides in the width direction of the surface in order to prevent so-called side leakage (see Patent Documents 1 and 2, for example).

Although there are various structures of rising gathers, most of the rising gathers have the following basic structure. That is, a base portion fixed to the absorbent article, a body portion extending from the base portion, and a lying portion formed by fixing the front end portion and the rear end portion of the body portion to the surface of the disposable diaper in a lying state. , a non-fixed raised portion positioned between the front and rear lying portions of the main body portion, and a gathered elastic member attached to at least the tip of the raised portion along the front-rear direction.

Such a conventional sit-up gather has a base portion and a body portion that are thin and flexible sheet-like portions in which non-woven fabric or the like is laminated, and is raised by the contraction force of a gathered elastic member provided between the layers. For this reason, on the surface of the absorbent article, the crotch part, which is away from the wearer's skin to some extent, has high rise gathers. The rising gathers are almost collapsed.

On the other hand, in order to improve the side leakage prevention performance, both sides of the absorbent body are folded back together with the top sheet to form a folded portion, and the portion of the folded portion located at the crotch portion is fixed to the facing surface. In addition, there is proposed one in which raised gathers are provided so as to protrude from the tip of the folded portion (see Patent Document 3). As a result, not only is a moderately sized temporary storage space formed between the non-folded portion and the body surface of the wearer, but also the excrement dammed up by the folded portion of the absorber is separated from the folded portion and the non-folded portion. Since it can be absorbed by both, it is possible to improve the side leakage prevention performance.

However, since the crotch portion of the absorbent body has a particularly high rigidity, if it is provided in the crotch portion of the absorbent article, the crotch portion is less likely to deform, resulting in a decrease in fit and deterioration in wearing comfort. will invite. Since the crotch portion of the absorbent article is required to deform following large changes in the shape of the wearer's body surface such as the movement of the wearer's legs, unnecessary improvement in rigidity must be avoided. Moreover, the deterioration of the fit in the crotch part may lead to the deterioration of the side leakage prevention performance.

Japanese Patent No. 5859087 JP 2015-092947 A JP-A-04-051952

SUMMARY OF THE INVENTION Accordingly, the main object of the present invention is to improve the side leakage prevention performance without deteriorating the fit of the crotch portion.

The absorbent article that solves the above problems is as follows.
<First Aspect>
Having a crotch portion, a front portion positioned forward of the crotch portion, and a rear portion positioned rearward of the crotch portion,
Absorbers provided in the front part, the crotch part and the rear part;
one or more coating layers covering at least the front side of the absorbent body;
A riser gather that rises to the front side and is provided from the front part to the rear part through both sides of the crotch part;
In an absorbent article comprising
The region having the absorber includes a first region located in the middle in the front-rear direction and including at least a part of the crotch portion, and a second region located on at least one side of the first region,
The second region has a folded portion in which a side portion of the absorbent body and a side portion of the covering layer are integrally folded back to the front side,
In the first region, the side portion of the absorbent body is not folded back to the front side,
An absorbent article characterized by:

(Effect)
This absorbent article basically has a structure in which the rising gathers extend from the front to the rear through both sides of the crotch part. On top of that, while securing a first region in which the side part of the absorber is not folded back in the middle of the region having the absorber in the front and back direction, the side part of the absorber and the covering A second region is provided that includes a folded portion in which the side portion of the layer is integrally folded back to the front side. Therefore, in the crotch part of the present absorbent article, the side leakage prevention effect due to the rising gathers is exhibited while preventing the deterioration of the deformability due to the folding of the absorbent body, the deterioration of the fitting property and the deterioration of the wearing feeling caused thereby. On the other hand, in at least one of the front and rear sides of the crotch region, not only is a moderately sized temporary storage space formed between the unfolded portion and the wearer's body surface by the folded portion of the absorbent body and the covering layer. Since excrement blocked by the folded portion of the absorbent body can be absorbed by both the folded portion and the non-folded portion, the side leakage preventing performance can be improved.

<Second Aspect>
The rising gathers are provided at the front and rear end portions and are fixed in the lying state, and the unfixed free portions are provided between the front and rear lying portions. and a gathered elastic member provided along
A portion of the rising gathers located in the second region includes the free portion,
The free portion located in the second region has a proximal portion adjacent to the side surface and top surface of the folded portion, and a protruding portion protruding above the folded portion.
The absorbent article of the first aspect.

(Effect)
In the present absorbent article, the folded portion is supported by the adjacent portion of the raised gathers so that the folded portion does not open outward in the width direction, and the protruding portion protruding above the folded portion is raised by the gathered elastic member. The get-up gathers work well.

<Third Aspect>
At least a portion of the folded portion on the first region side is not fixed to the facing surface,
The proximal portion extends to the tip of the folded portion,
The protruding portion protrudes from the tip of the folded portion,
Having a joint portion where at least the upper surface of the tip portion of the folded portion and the adjacent portion are joined,
A gathering elastic member is also provided at a portion corresponding to the distal end of the folded portion in the adjacent portion.
The absorbent article of the second aspect.

(Effect)
In this absorbent article, the tip of the folded portion rises together with the adjacent portion due to the contractile force of the gather elastic member of the adjacent portion. As a result, in the second region, the folded portions of the absorbent body and the covering layer are also raised inside the raised gathers together with the raised gathers, thereby reinforcing the side leakage prevention function.

<Fourth Aspect>
The lying portion of the rising gather includes a portion located in the second region and a portion located on the waist side of the second region,
At least a part of the free portion side of the portion overlapping the lodging portion in the folded portion is not fixed to the facing surface,
The absorbent article of the third aspect.

(Effect)
In the present absorbent article, the part where the rising gathers start to fall is provided with a part where the folded part of the absorbent body and the covering layer is not fixed and the part can be raised, thereby supplementing the leakage prevention property in the lying part of the rising gathers. be able to.

<Fifth Aspect>
A plurality of the joints are provided at intervals in at least the front-rear direction,
The absorbent article of the third or fourth aspect.

(Effect)
The joint portion between the folded portion and the adjacent portion of the rising gathers is necessary to transmit the rising force of the rising gathers to the folded portion. Not only does it shrink unnecessarily, but the shrinkage of the gather elastic member is inhibited by the absorber. Therefore, it is preferable that the joint portions are spaced apart in the front-rear direction as described above.

<Sixth Aspect>
Having the second region only behind the first region,
The front side of the first region is a third region in which the side portion of the absorbent body is not folded back to the front side,
The absorbent article according to any one of the first to fifth aspects.

(Effect)
In the absorbent article, since the front side of the absorbent article is deformed according to changes in swelling of the abdomen due to eating, there is a strong possibility that the folded portion may deteriorate the feeling of wearing after eating. On the other hand, there is no such problem on the rear side of the absorbent article, and it is desirable that a temporary storage space is formed, considering that leakage is likely to occur during sleep. Therefore, it is desirable to provide the second region having the folded portion only behind the first region as in this aspect.

As described above, according to the present invention, it is possible to improve the side leakage prevention performance without deteriorating the fit of the crotch portion.

Fig. 2 is a plan view showing the inner surface of the underpants-type disposable diaper in an unfolded state; Fig. 2 is a plan view showing the outer surface of the pants-type disposable diaper in an unfolded state; FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1; 3 is a cross-sectional view taken along line 3-3 of FIG. 1; FIG. (a) 4-4 cross-sectional view of FIG. 1, and (b) 5-5 cross-sectional view of FIG. 1 is a perspective view of a pants-type disposable diaper; FIG. FIG. 4 is a plan view showing the absorbent body in an unfolded state; FIG. 4 is a plan view showing the outer surface of the inner body in the unfolded state together with the outline of the outer body; FIG. 4 is a plan view showing the inner surface of the inner body in the unfolded state; (a) 6-6 cross-sectional view of FIG. 9, (b) 7-7 cross-sectional view of FIG. 9, and (c) 8-8 cross-sectional view of FIG. FIG. 4 is a plan view showing the inner surface of the inner body in the unfolded state; (a) a sectional view corresponding to the 6-6 section in FIG. 9, (b) a sectional view corresponding to the 7-7 section in FIG. 9, and (c) a sectional view corresponding to the 8-8 section in FIG. FIG. 4 is a plan view showing the main parts of the inner body in the unfolded state; FIG. 4 is a plan view showing the main parts of the inner body in the unfolded state;

Hereinafter, examples of absorbent articles will be described in detail with reference to the accompanying drawings. The dotted pattern portion in the cross-sectional view indicates an adhesive as a joining means for joining each constituent member. The hot melt adhesive is applied by known methods such as slot coating, continuous line or dotted line bead coating, spiral or Z-shaped spray coating, or pattern coating (transfer of hot melt adhesive by letterpress method). can be applied. Alternatively or additionally, at the fixing portion of the elastic member, a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member. Hot-melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, and polyester-polyamide-based adhesives, and can be used without particular limitation. As a joining means for joining each constituent member, a means by material welding such as heat sealing or ultrasonic sealing can be used.

In addition, as the nonwoven fabric in the following description, a known nonwoven fabric can be appropriately used depending on the site and purpose. Constituent fibers of non-woven fabrics include, for example, synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene (including composite fibers such as core-sheath fibers in addition to single-component fibers), as well as recycled rayon and cupra. Fibers, natural fibers such as cotton, etc., can be selected without particular limitation, and these can also be mixed and used. In order to increase the softness of the nonwoven fabric, it is preferable to use crimped fibers as the constituent fibers. In addition, even if the constituent fibers of the nonwoven fabric are hydrophilic fibers (including those made hydrophilic by a hydrophilic agent), they may be hydrophobic fibers or water-repellent fibers (water-repellent fibers made water-repellent by a water-repellent agent). including). In addition, nonwoven fabrics are generally classified into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bonded (air-through) nonwoven fabrics, and needle punched nonwoven fabrics, depending on the fiber length, sheet forming method, fiber bonding method, and laminate structure. Non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (including SSS non-woven fabrics in which the same or similar non-woven fabric layers are laminated, SMS non-woven fabrics in which different non-woven fabric layers are laminated, in which a meltblown layer is sandwiched between spunbond layers, SMMS non-woven fabrics, etc.), etc. However, any of these nonwoven fabrics can be used.

1 to 10 show an example of a pants-type disposable diaper. This pants-type disposable diaper includes a front outer body 12F that constitutes at least the waist circumference of the front body F, a rear outer body 12B that constitutes at least the waist circumference of the back body B, and from the front outer body 12F through the crotch part. and an interior body 200 provided inside the exterior bodies 12F and 12B so as to extend to the rear exterior body 12B. Both sides of the front exterior body 12F and both sides of the rear exterior body 12B are joined to form the side seal portions 12A, and the openings formed by the front and rear end portions of the exterior bodies 12F and 12B correspond to the wearer's torso. A waist opening WO through which the legs are passed is formed, and portions surrounded by the lower edges of the outer bodies 12F and 12B and the side edges of the inner body 200 on both sides in the width direction of the inner body 200 are leg openings LO through which the legs are passed. The inner body 200 is a part that absorbs and holds excrement such as urine, and the outer bodies 12F and 12B are parts that support the inner body 200 against the wearer's body. Symbol Y indicates the total length of the diaper in the unfolded state (the length in the front-rear direction 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 the symbol X indicates the diaper in the unfolded state. shows the full width of

This pants-type disposable diaper has a waist region T defined as a front-back direction range (a front-back direction range from the waist opening WO to the upper ends of the leg openings LO) having the side seal portions 12A, and a front-back direction of the portion forming the leg openings LO. It has an intermediate region L defined as a range (between the longitudinal region having the side seal portions 12A of the front body F and the longitudinal region having the side seal portions 12A of the back body B). The waist region T can be divided into a “waist portion” W conceptually forming the edge of the waist opening and a “lower waist portion” U below this. Usually, when there is a boundary where the elastic stress in the width direction WD changes in the waist region T (for example, the thickness or elongation rate of the elastic member changes), the waist opening WO side is the waist opening WO side of the boundary closest to the waist opening WO side. If there is no such boundary, the waist portion W is on the waist opening WO side of the absorber 56 or the inner body 200 . The length in the front-rear direction differs 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 lower waist portion U can be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are constricted in a U-shape or curvilinear shape along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is inserted. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(Exterior body)
The illustrated outer bodies 12F and 12B are composed of a front outer body 12F that constitutes the front body F and a rear outer body 12B that constitutes the back body B. The armor body 12B is not continuous on the crotch side and is spaced apart in the front-rear direction LD (armor halves type). This separation distance 12d can be, for example, approximately 150 to 250 mm. Also, although not shown, the outer body 12 may be an integral body extending from the front body F to the back body B through the crotch (exterior integrated type).

The outer bodies 12F and 12B have a waist portion corresponding to the waist region T in the front-rear direction. In addition, in this embodiment, the rear exterior body 12B is longer in the front-rear exterior body 12F than the front exterior body 12F. The side exterior body 12B has a buttock cover portion C extending from the waist region T toward the middle region L side. Although not shown, the front exterior body 12F may also be provided with an inguinal cover portion extending from the waist region T toward the intermediate region L side, or may be provided with an inguinal cover portion but not with a buttock cover portion. It is not necessary to provide a portion corresponding to the intermediate region L on both sides of the rear exterior body 12B. In the illustrated embodiment, the lower edge of the buttock cover portion C is formed in a straight line along the width direction WD, like the lower edge of the front exterior body 12F. It can also be a curve that

As shown in FIGS. 4 and 5, the exterior bodies 12F and 12B have an outer sheet layer 12S and an inner sheet layer 12H positioned outside and inside elastic members 15 to 19, respectively, which will be described later. are joined by the joining means of The sheet material forming the outer sheet layer 12S and the sheet material forming the inner sheet layer 12H may be a single common sheet material, or may be separate sheet materials. That is, in the former case, in part or all of the exterior body, the inner sheet layer is formed by the inner portion and the outer portion of a single sheet material folded back at the edge of the waist opening WO (which may be the edge on the crotch side). 12H and an outer sheet layer 12S are formed respectively. The former mode has the advantage that the number of sheet materials is small, and the latter mode has the advantage that the inner sheet layer 12H and the outer sheet layer 12S are less likely to be misaligned when they are bonded together. The illustrated embodiment corresponds to the latter, in which the sheet material forming the inner sheet layer 12H extends only to the edge of the waist opening WO, while the sheet material forming the outer sheet layer 12S extends only to the edge of the waist opening WO. The folded portion 12r extends so as to cover the waist-side edge of the inner body 200. As shown in FIG.

The sheet material used for the outer sheet layer 12S and the inner sheet layer 12H is not particularly limited, but nonwoven fabric is preferable. When a non-woven fabric is used, it is preferable that its basis weight is about 10 to 30 g/m ² .

(stretchable area/non-stretchable area)
Elastic members 15 to 19 are provided between the outer sheet layer 12S and the inner sheet layer 12H in order to enhance the fit around the wearer's waist in the outer bodies 12F and 12B. A stretchable region A2 that elastically stretches is formed in the WD. In the stretchable region A2, the outer sheet layer 12S and the inner sheet layer 12H contract with the contraction of the elastic member in the natural length state, forming wrinkles or folds. The sheet layer 12S and the inner sheet layer 12H can be stretched up to a predetermined elongation rate at which they are fully stretched without wrinkles. As the elastic members 15 to 19, in addition to elongated elastic members such as thread rubber (illustrated example), well-known elastic members such as belt-like, mesh-like, and film-like elastic members can be used without particular limitation. As the elastic members 15 to 19, synthetic rubber or natural rubber may be used.

For bonding the outer sheet layer 12S and the inner sheet layer 12H in the exterior bodies 12F and 12B and fixing the elastic members 15 to 19 sandwiched between them, hot-melt adhesives, heat sealing, and ultrasonic sealing by various coating methods are used. At least one of fixing means by material welding such as welding can be used. If the entire surfaces of the exterior bodies 12F and 12B are firmly fixed, the flexibility is impaired, so it is preferable that the elastic members 15 to 19 are not adhered or adhered weakly except for the adhered portions. In the illustrated embodiment, a hot melt adhesive is applied only to the outer peripheral surfaces of the elastic members 15 to 19 by applying means such as a comb gun or a sure wrap nozzle, and the elastic members 15 to 19 are sandwiched between the sheet layers 12S and 12H. The elastic members 15 to 19 are fixed to the sheet layers 12S and 12H and fixed between the sheet layers 12S and 12H only by the hot-melt adhesive applied to the outer peripheral surface of the sheet layers 12S and 12H. The elastic members 15 to 19 can be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends of the elastic region in the elastic direction.

To explain the elastic members 15 to 19 in the illustrated form in more detail, between the outer sheet layer 12S and the inner sheet layer 12H in the waist portion W of the outer bodies 12F and 12B, a plurality of elastic members are provided so as to be continuous throughout the width direction WD. waist elastic members 17 are attached with a space therebetween in the front-rear direction. One or more of the waist elastic members 17 disposed in the region adjacent to the lower waist portion U may overlap the inner body 200 or may overlap the inner body 200 in the width direction. Except for the part, it may be provided on both sides in the width direction. The waist elastic member 17 has a thickness of about 155 to 1880 dtex, particularly 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 1.5 mm 2 . 0 ^mm2 ) are preferably provided at intervals of 4 to 12 mm, and the elongation rate of the waist portion W in the width direction WD is 150 to 400%, particularly about 220 to 320%. It is preferable to have In addition, the waist portion W does not need to use the waist portion elastic member 17 having the same thickness or the same elongation rate in all of the waist portion W in the front-rear direction LD. The thickness and elongation rate may be different.

In addition, a plurality of waist lower elastic members 15 and 19 made of elongated elastic members are spaced in the front-rear direction between the outer sheet layer 12S and the inner sheet layer 12H in the waist lower portion U of the outer bodies 12F and 12B. It is installed with a gap.

The waist lower elastic members 15 and 19 have a thickness of 155 to 1880 dtex, especially ^about 470 to 1240 dtex (for synthetic rubber. It is preferable to provide about 5 to 30 thread rubbers of 1 to 15 mm, particularly 3 to 8 mm, at intervals of 1 to 15 mm ^, especially 3 to 8 mm, and the elongation rate of the lower waist portion U in the width direction WD is 200 to 350%. , particularly preferably about 240 to 300%.

Further, a cover section elastic member 16 made of an elongated elastic member is attached between the outer sheet layer 12S and the inner sheet layer 12H in the buttock cover section C of the rear exterior body 12B.

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 , especially 0.1 to 1.0 mm. ² ) is preferably provided, or a plurality of rubber threads are provided at intervals in the front-back direction, and the elongation rate of the buttock cover portion C in the width direction WD is 150 to 300%, particularly 180 to 260%. is preferred.

In the case of providing an inguinal cover portion on the front side exterior body 12F, similarly, a cover portion elastic member can be provided.

When the elastic members 15, 16, 19 are provided in the front-back direction range having the absorber 56 as in the illustrated embodiment of the waist lower part U and the buttocks cover part C, part or all of the elastic members 15, 16, 19 extend in the width direction of the absorber 56. In order to prevent contraction of the WD, the middle portion in the width direction (preferably including the entire inner and outer joints 201 and 202) including part or all of the portion overlapping the absorbent body 56 in the width direction WD is defined as the non-stretchable region A1. , and both sides thereof in the width direction are defined as stretchable regions A2. Although it is preferable that the waist portion W is the stretchable region A2 over the entire width direction WD, a non-stretchable region A1 may be provided in the middle of the widthwise direction similarly to the lower waist portion U.

The stretchable region A2 and the non-stretchable region A1 supply the elastic members 15 to 17 and 19 between the inner sheet layer 12H and the outer sheet layer 12S, and the elastic members 15, 16 and 19 are arranged in the stretchable region A2. At least at both ends in the stretch direction of the elastic members 15, 16, and 19 are fixed at the middle in the width direction without fixing in the region that becomes the non-stretchable region A1. , or cut almost the entire elastic member 15, 16, 19 finely by applying pressure and heat, and stretchable in the non-stretchable region A1 while leaving stretchability in the stretchable region A2. It can be constructed by killing sex. In the former case, as shown in FIG. 4 , in the non-stretchable region A1, the uncut portion of the elastic members 15, 16, and 19 continuing from the elastic members 15, 16, and 19 of the stretchable region A2 is shrunk to its natural length as the unnecessary elastic member 18. It will remain between the outer sheet layer 12S and the inner sheet layer 12H. In the latter case, although not shown, the remaining cut portions continuing from the elastic members 15, 16, 19 of the elastic regions A2 and the elastic members 15 of both elastic regions A2 , 16, 19 and the cut piece of the elastic member that is not continuous with the outer sheet layer 12S and the inner sheet layer 12H remains as an unnecessary elastic member alone in a state of being contracted to its natural length.

(Cover nonwoven fabric)
In a pants-type disposable diaper with an exterior that is divided into two parts, the interior body 200 is exposed between the front exterior body 12F and the rear exterior body 12B. It is preferable that the cover nonwoven fabric 13 covering the back surface of the inner body 200 is provided from between the front outer body 12F and the inner body 200 to between the rear outer body 12B and the inner body 200 .

(internal and external joints)
Fixing of the inner body 200 to the outer bodies 12F and 12B can be performed by means of material welding such as heat sealing or ultrasonic sealing, or hot melt adhesive. In the illustrated embodiment, the hot-melt adhesive applied to the back surface of the inner body 200, that is, the back surface of the liquid-impermeable sheet 11 and the root portion 65 of the rising gather 60 in this case, is applied to the inner surfaces of the exterior bodies 12F and 12B. is fixed. The inner and outer joints 201 and 202 for fixing the inner body 200 and the outer bodies 12F and 12B can be provided almost entirely in the region where the two overlap. can also

(inner body)
The inner body 200 can take any shape, but in the illustrated form it is rectangular. As shown in FIGS. 3 to 5, the inner body 200 comprises a body-side top sheet 30, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. This is the main body part responsible for the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid permeating the top sheet 30 to the absorbent element 50, and reference numeral 60 denotes an intermediate sheet. 4 shows rise gathers 60 extending from both sides of the inner body 200 so as to come in contact with the legs of the wearer in order to prevent leakage of excrement to both sides of the inner body 200. FIG.

(top sheet)
The top sheet 30 has the property of being permeable to liquid, and examples thereof include perforated or non-perforated non-woven fabrics and porous plastic sheets. In addition, among these, the nonwoven fabric is not particularly limited as to what the raw material fibers are. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, and polyamides, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of these. etc. can be exemplified. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of processing methods include known methods such as spunlace, spunbond, thermal bond, meltblown, needle punch, air through, and point bond methods. For example, if flexibility and drapeability are desired, the spunbond method and spunlace method are preferable, and if bulkiness and softness are desired, 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 laminating two or more sheets. Similarly, the top sheet 30 may consist of one sheet or two or more sheets in the planar direction.

Both sides of the top sheet 30 may be folded back at the side edges of the absorbent element 50 , or may protrude laterally from the side edges of the absorbent element 50 without being folded.

The top sheet 30 can be fixed to a member adjacent to the back side by means of material welding, such as heat sealing or ultrasonic sealing, or hot-melt adhesive for the purpose of preventing misalignment with respect to the member on the back side. desirable. In the illustrated embodiment, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 with a hot-melt adhesive applied to its back surface.

(intermediate sheet)
An intermediate sheet (also called a second sheet) 40 having a higher liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated the top sheet 30 to the absorbent body. The intermediate sheet 40 is intended to quickly transfer the liquid to the absorber to enhance the absorption performance of the absorber and prevent the absorbed liquid from returning from the absorber. The intermediate sheet 40 can also be omitted.

Examples of the intermediate sheet 40 include materials similar to those of the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, pointbond nonwoven fabric, and crepe paper. In particular, an air-through nonwoven fabric is preferred because it is bulky. Composite fibers having a core-sheath structure are preferably used 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. The basis weight is preferably 17-80 g/m ² , more preferably 25-60 g/m ² . The thickness of the raw fibers of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the non-woven fabric bulky, it is also preferable to use eccentric fibers, hollow fibers, or eccentric and hollow fibers whose core is not in the center as mixed fibers of all or part of the raw material fibers.

The intermediate sheet 40 in the illustrated form is shorter than the width of the absorbent body 56 and arranged in the center, but may be provided over the entire width. The length of the intermediate sheet 40 in the front-rear direction may be the same as the full length of the diaper, the length of the absorbent element 50, or within a short length range centered on the liquid-receiving area.

The intermediate sheet 40 can be fixed to a member adjacent to the back side by means of material welding, such as heat sealing or ultrasonic sealing, or hot-melt adhesive for the purpose of preventing misalignment with respect to the member on the back side. desirable. In the illustrated form, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 positioned on the front side of the absorbent body 56 by a hot-melt adhesive applied to the back surface thereof.

(liquid-impermeable sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited, but examples thereof include plastic films made of olefin resins such as polyethylene and polypropylene, laminated nonwoven fabrics in which a plastic film is provided on the surface of nonwoven fabrics, and plastic films. A laminated sheet in which a nonwoven fabric or the like is laminated and joined to the sheet can be exemplified. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. Moisture-permeable plastic films include microporous plastic films obtained by kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching the sheet in a uniaxial or biaxial direction. is widely used. Other methods include non-woven fabrics using microdenier fibers, leak-proof enhancement by reducing fiber voids by applying heat and pressure, and coating with superabsorbent or hydrophobic resins or water repellents. Therefore, a sheet made liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11, but sufficient adhesive strength is obtained when bonding with the cover nonwoven fabric 13 described later via a hot-melt adhesive. It is desirable to use a resin film in order to obtain

The liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the figure. It can also extend to both sides. It is appropriate that the width of this extended portion is about 5 to 20 mm on each side.

(absorbing element)
The absorbent element 50 has an absorbent body 56 and a wrapping sheet 58 that wraps the entire absorbent body 56 . The packaging sheet 58 can also be omitted.

(Absorber)
Absorbent body 56 can be formed from an aggregate of fibers. The filament assembly may be a filament assembly obtained by laminating short fibers such as cotton pulp or synthetic fibers, or by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate as necessary. can also be used. The fiber basis weight can be, for example, about 100 to 300 g/m ² when piling up cotton pulp or short fibers, and for example, about 30 to 120 g/m ² for filament aggregates. can be done. The fineness of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, more preferably 1 to 5 dtex. In the case of a filament assembly, the filaments may be non-crimped fibers, but crimped fibers are preferred. The degree of crimping of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, more preferably 15 to 50 per 2.54 cm. Further, uniformly crimped crimped fibers can be used. It is preferable to disperse and hold superabsorbent polymer particles in the absorbent body 56 .

The absorber 56 may have a rectangular shape, but as shown in FIGS. This is preferable because the fit of the body 56 itself and the riser gathers 60 around the legs is improved.

Also, the size of the absorbent body 56 can be appropriately determined as long as it spans the front and back of the crotch part, but it preferably extends to the peripheral edge of the inner body 200 or its vicinity in the front-rear direction LD and width direction WD. The reference numeral 56X indicates the full width of the absorber 56. As shown in FIG.

(superabsorbent polymer particles)
Absorbent body 56 may contain superabsorbent polymer particles in part or in its entirety. Superabsorbent polymer particles include "powder" in addition to "particles". As the superabsorbent polymer particles, those used in this type of disposable diaper can be used as they are. The percentage of particles remaining on the sieve is preferably 30% by weight or less, and the percentage of particles remaining on the sieve after sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006) is 60. % by weight or more is desirable.

Materials for the superabsorbent polymer particles may be used without any particular limitation, but those having a water absorption of 40 g/g or more are suitable. Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles. and acrylic acid (salt) polymers can be used. As for the shape of the superabsorbent polymer particles, the powder particles that are commonly used are 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 rate is too slow, the liquid supplied into the absorbent body 56 tends to return to the outside of the absorbent body 56, which is called reversion.

As the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the absorbent body 56 is bulky, it is possible to effectively suppress the feeling of stickiness after liquid absorption.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorbent body 56 . Therefore, although it cannot be generalized, it can be 50 to 350 g/m ² . If the weight per unit area of the polymer is less than 50 g/m ² , it becomes difficult to secure the absorption amount. Above 350 g/m ² , the effect saturates.

(packaging sheet)
When the packaging sheet 58 is used, tissue paper, particularly crepe paper, non-woven fabric, poly-laminated non-woven fabric, a perforated sheet, or the like can be used as the material. However, it is desirable that the sheet is such that the superabsorbent polymer particles do not escape. When non-woven fabric is used instead of crepe paper, hydrophilic SMS non-woven fabric (SMS, SSMMS, etc.) is particularly suitable, and its material can be polypropylene, polyethylene/polypropylene composite, or the like. The basis weight is preferably 5 to 40 g/m ² , particularly 10 to 30 g/m ² .

(folded part)
As shown in FIGS. 1, 9, and 10, the region Q0 having the absorber of the pants-type disposable diaper is located in the middle of the front-rear direction LD and includes a first region Q1 including at least a portion of the crotch portion. and a second region Q2 located on at least one side of the first region Q1, and as shown in FIG. A folded portion 70 is provided in which the side portions of the sheet 30 and the packaging sheet 58 are integrally folded back to the front side, and in the first region Q1, the side portions 56s of the absorber 56 are not folded back to the front side.

The range of the first region Q1 is not particularly limited as long as it is positioned midway in the front-rear direction LD of the region Q0 having the absorber and includes at least a portion of the crotch portion, but preferably includes the entire crotch portion. In particular, when the absorber 56 has a constricted portion 56N, the first region Q1 can be the range in the front-rear direction LD having the constricted portion 56N.

As long as the range of the second region Q2 is located on at least one of the front and rear sides of the first region Q1, the waist-side boundary has an absorber even if it is located at the waist-side end of the region Q0 having the absorber. It may be separated from the waist-side end of the region Q0 toward the first region Q1. In addition, the second region Q2, that is, the folded portion 70 is provided only on one of the front and rear sides of the first region Q1, and the other side serves as a third region Q3 in which the side portion of the absorbent body 56 is not folded back to the front side. good. In particular, in the case of disposable diapers, the front side is deformed according to changes in swelling of the abdomen due to meals, so if there is the folded portion 70, there is a strong possibility that the feeling of wearing the diaper will deteriorate after meals. On the other hand, there is no such problem on the rear side of the disposable diaper, and it is desirable that a temporary storage space be formed in consideration of the fact that leakage is likely to occur during sleep. Therefore, as shown in FIG. 11, it is desirable to provide the second region Q2 having the folded portion 70 only behind the first region Q1.

In the illustrated example, the folded portion 70 of the second region Q2 is formed by attaching the intermediate sheet 40 and the top sheet 30 to the upper surface of the absorbent element 50 in which the absorbent body 56 is wrapped with the wrapping sheet 58, and the sides of the top sheet 30. It can be formed by folding the side edges of the absorbent element 50 back to the back side of the absorbent element 50 and attaching the same, and then folding back the both side portions to the front side at predetermined folding positions. In this case, as shown in FIG. 7, in the absorbent body 56 before folding, the side edge of the portion located in the first region Q1 is located on the center side in the width direction from the folding position FL, and the portion located in the second region Q2. should be located on the center side in the width direction from the folding position FL. In this manufacturing method, as shown in FIGS. 9 and 10, the absorbent core 56 is not folded in the first region Q1, whereas the top sheet 30 and the packaging sheet 58 are folded in the first region Q1 and the second region Q2. Although the portion positioned in the first region Q1 is folded back as a whole, the side portion of the portion positioned in the first region Q1 of the top sheet 30 and the packaging sheet 58 may be cut in advance so as not to be folded back.

Although the width dimension 70W of the folded portion 70 is not particularly limited, it can be normally about 10 to 40 mm, particularly about 15 to 30 mm.

In the illustrated example, the top sheet 30, the intermediate sheet 40, and the packaging sheet 58 are provided as coating layers covering at least the front side of the absorbent body 56, and the relationship between the width of the folded portion 70 and the width of the intermediate sheet 40. Above, the folded portion 70 does not include the sides of the intermediate sheet 40 . As such, not all of the covering layer need be included in the folded portion 70 . In the illustrated example, the wrapping sheet 58 is included in the folded portion 70 for the convenience of having the wrapping sheet 58, but the absorbent article without the wrapping sheet 58 naturally does not include the wrapping sheet 58 in the folded portion 70.

(Getting up gathers)
The rising gathers 60 are provided in contact with the wearer's legs to prevent side leakage. In the illustrated example of the underpants-type disposable diaper, it extends along both sides of the inner body 200 over the entire front-rear direction LD of the inner body 200 . In other words, this underpants-type disposable diaper is based on a structure in which the rising gathers 60 extend from the front portion to the rear portion through both sides of the crotch portion. In addition, while securing a first region Q1 in which the side portion of the absorbent body 56 is not folded back in the middle of the region Q0 having the absorbent body in the front-rear direction LD, the absorbent body 56 A second region Q2 is provided that includes a folded portion 70 in which the top sheet 30 and the packaging sheet 58, which have a side portion 56s and a portion covering the front side thereof, are integrally folded back to the front side. Therefore, as can be seen from FIGS. 9 and 10, in the crotch portion of the pants-type disposable diaper, the deterioration of the deformability due to the folded back of the absorbent body 56, the deterioration of the fit and the deterioration of the wearing feeling due to this are prevented. , the side leakage prevention effect by the rising gathers 60 is exhibited. On the other hand, in at least one of the front and rear sides of the crotch portion, the absorbent body 56 and the folded portion 70 of the covering layer form a temporary storage space of an appropriate size between the non-folded portion 72 and the wearer's body surface. In addition, since the excrement blocked by the folded portion 70 of the absorbent body 56 can be absorbed by both the folded portion 70 and the non-folded portion 72, side leakage preventing performance can be improved.

The riser gathers 60 of the example shown in FIG. 10 are formed almost entirely, with the root side portion 60B rising obliquely from the side portion of the inner body 200 toward the center in the width direction, and the tip side portion 60A extending outward in the width direction from the intermediate portion. Although it is a surface contact type that rises obliquely toward the front side, it is not limited to this as long as it rises to the front side. As with the rising gathers 60 in the example shown in FIG. 12, appropriate modifications are possible, such as a line contact type that stands up on the center side in the width direction as a whole.

More specifically, the illustrated rising gathers 60 are formed by folding a band-shaped gathered nonwoven fabric 62 having a length equal to the length of the inner body 200 in the front-rear direction in the width direction WD at the leading end to fold it in two. While overlapping, a plurality of elongated gather elastic members 63 are fixed at intervals in the width direction WD between layers such as tip portions (folded portions) while being stretched along the longitudinal direction. A base end portion of the rising gathers 60 located on the opposite side to the tip portion (the end portion on the side opposite to the sheet folded portion in the width direction WD) is fixed to the side portion of the inner body 200 on the back side of the liquid-impermeable sheet 11. The base portion 65 is formed as a flattened base portion 65, and the portion other than the base portion 65 is a body portion 66 extending from the base portion 65 (portion on the folded portion side). In the example shown in FIG. 10 , both front and rear end portions of the main body portion 66 are divided into a root side portion 60B extending toward the center in the width direction and a tip end extending outward in the width direction. In the laid-down state folded to have the side portions 60A, the laid-down portions 67 are fixed against the side surfaces of the topsheet 30. As shown in FIG. On the other hand, in the example shown in FIG. 12 , both front and rear end portions of the main body portion 66 are fixed to the side surfaces of the top sheet 30 in a laid-down state in which the main body portion 66 extends only toward the center in the width direction. A lodged portion 67 is formed. In any of the examples, the intermediate portion located between the front and rear fallen portions 67 is a non-fixed free portion 68, and at least the tip portion of the free portion 68, a gather elastic member 63 extends along the front-rear direction LD. status is fixed.

In the riser gathers 60 configured as described above, the contractile force of the gather elastic members 63 acts to bring the front and rear ends closer together, but the front and rear ends of the body portion 66 are fixed so as not to stand up. On the other hand, since there is a non-fixed free portion 68 between them, only the free portion 68 stands up so as to contact the body surface as shown in FIGS. 10 and 12, respectively. In particular, it is one preferable structure that the base portion 65 is positioned on the back side of the inner body 200, that is, on the back side of the absorbent body 56. Many type disposable diapers and pad type disposable diapers have such side flap portions), the root portion 65 can be attached to the side flap portion (not shown).

In the lying portion 67 of the example shown in FIG. 10, the tip side portion 60A and the root side portion 60B are joined in the lying state, and the root side portion 60B is joined to the top sheet 30 in the lying state. 12, at least the tip of the body portion 66 is joined to the topsheet 30. In the example of the lying portion 67 shown in FIG. At least one of hot-melt adhesives by various application methods and material welding means such as heat sealing and ultrasonic sealing can be used to join the facing surfaces in these lodging portions 67 . In this case, the bonding of the root side portion 60B and the top sheet 30 and the bonding of the tip side portion 60A and the root side portion 60B may be performed by the same means or by different means. For example, the root side portion 60B and the top sheet 30 can be joined with a hot melt adhesive, and the tip side portion 60A and the root side portion 60B can be joined with material welding.

As the gathered nonwoven fabric 62, nonwoven fabric such as spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), meltblown nonwoven fabric, etc., which is flexible and excellent in uniformity and concealability, is water-repellent with silicone or the like as necessary. A treated material can be preferably used, and the fiber basis weight is preferably about 10 to 30 g/m ² . Also, as shown in the figure, a waterproof film 64 can be interposed between the gathered nonwoven fabrics 62 folded in two.

A thread rubber or the like can be used as the gather elastic member 63 . When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate when fixed is preferably 150 to 350%, more preferably 200 to 300%. The number of gather elastic members 63 is preferably 2-6, more preferably 3-5. An appropriate spacing 60d between the gathering elastic members 63 is 3 to 10 mm.

In the free portion 68 of the rising gather 60, the inner layer and the outer layer of the gathered nonwoven fabric 62 are adhered together, and the gathered elastic member 63 sandwiched between them is fixed by hot-melt adhesive, heat sealing, ultrasonic wave, or the like by various coating methods. At least one of fixing means by material welding such as a seal can be used. If the inner layer and the outer layer of the gathered nonwoven fabric 62 are entirely adhered together, the flexibility is impaired, so it is preferable that the portions of the gathered elastic member 63 other than the adhered portion are not adhered or adhered weakly. In the illustrated embodiment, a hot-melt adhesive is applied only to the outer peripheral surface of the gathered elastic member 63 by an application means such as a comb gun or a sure wrap nozzle, and the gathered elastic member 63 is sandwiched between the inner layer and the outer layer of the gathered nonwoven fabric 62 . The gathered elastic member 63 is fixed to the inner layer and the outer layer of the gathered nonwoven fabric 62, and the inner layer and the outer layer of the gathered nonwoven fabric 62 are fixed only by the hot-melt adhesive applied to the outer peripheral surface of the. there is

Similarly, for fixing the waterproof film 64 and the gathered nonwoven fabric 62 incorporated in the riser gather 60 and fixing the lodging portion 67, hot melt adhesives by various coating methods and material welding such as heat sealing and ultrasonic sealing are used. At least one of the means according to can be used.

Although the dimensions of the rising gathers 60 can be determined as appropriate, for example, as shown in FIG. It is preferably 5 to 2.5 times.

The riser gathers 60 may be laterally spaced from the folded portion 70 or may not have a portion extending above the folded portion 70, but as shown in the illustrated example, the second portion of the riser gathers 60 The portion located in the region Q2 includes the free portion 68, and the portion located in the second region Q2 in the main body portion 66 of the rising gathers 60 consists of a proximal portion 69B adjacent to the side surface and the top surface of the folded portion 70, and a folded portion. Preferably, it has a protruding portion 69A that protrudes above 70. FIG. As a result, the protruding portion 69A projecting above the folded portion 70 is supported by the adjacent portion 69B of the raised gather 60 so that the folded portion 70 does not open outward in the width direction. The rising gathers 60 also function firmly in the region Q2.

Part or all of the folded portion 70 may be fixed to the facing surface or may be unfixed. However, when the rising gathers 60 have the adjacent portion 69B as in the illustrated example, at least a portion of the folded portion 70 on the side of the first region Q1 is not fixed to the facing surface (see FIG. 10 ( b), see FIG. 12(b)), the proximal portion 69B extends to the tip of the folded portion 70, the projecting portion 69A protrudes from the tip of the folded portion 70, and extends at least at the tip of the folded portion 70. It is preferable to have a joint portion 60C where the upper surface and the proximal portion 69B are joined, and to provide the gathering elastic member 63 also at a portion of the proximal portion 69B corresponding to the tip portion of the folded portion 70. FIG. As a result, the tip of the folded portion 70 rises together with the proximal portion 69B due to the contractile force of the gather elastic member 63 of the proximal portion 69B. As a result, in the second region Q2, the absorbent body 56 and the folded portion 70 of the covering layer also rise inside the rising gathers 60 together with the rising gathers 60, thereby reinforcing the side leakage prevention function. In addition, although the symbol AF in the drawing indicates a hot-melt adhesive for forming the joint portion 60C and the lodging portion 67, means other than the hot-melt adhesive may be used.

As long as the rising gathers 60 are laid down, the folded portion 67 may or may not be fixed to the facing surface at all of the portion of the folded portion 70 that overlaps with the laid-down portion 67 . However, as in the illustrated example, the lying portion 67 of the rising gathers 60 has a portion 67A located in the second region Q2 and a portion located further to the waist side than the portion 67A. If at least a portion of the overlapping portion on the side of the first region Q1 is not fixed to the facing surface, there is a portion where the folded portion 70 can be raised at the portion where the rising gathers 60 begin to fall down. can supplement the leakproofness at the lodging portion 67 of the . In addition, although the code|symbol BF in a figure shows the hot-melt adhesive for fixing the folding|returning part 70 to an opposing surface, you may use means other than a hot-melt adhesive.

A joint portion 60C between the folded portion 70 and the adjacent portion 69B of the rising gathers 60 is necessary to transmit the rising force of the rising gathers 60 to the folded portion 70. As shown in FIG. If the midpoint pattern portion) is continuous in the front-back direction LD, not only will the absorber 56, the top sheet, and the packaging sheet 58 unnecessarily shrink due to the gather elastic member 63, but the shrinkage of the gather elastic member 63 will be absorbed. blocked by body 56; Therefore, as shown in FIG. 14, a joining portion 60C (dotted portion in the drawing) between the folded portion 70 and the adjacent portion 69B of the rising gather 60 has a short front-rear direction LD dimension of about 5 to 15 mm, and the front-rear direction It is preferable that a plurality of the LDs be provided at intervals.

From the viewpoint of manufacturability, it is desirable that the portion 68A of the rising gather 60 located in the first region Q1 has a cross-sectional structure continuing from the portions 68B and 67A located in the second region Q2. Therefore, when the folded portion 71 of the top sheet 30 and the packaging sheet 58 is formed as in the first region Q1 in the illustrated example, the free portion 68 is formed as shown in FIGS. The portion 68A positioned in the first region Q1 also protrudes above the adjacent portion 69B adjacent to the side and upper surfaces of the folded portion 71 of the top sheet 30 and the packaging sheet 58 and the folded portion 70 of the top sheet 30 and the packaging sheet 58. It is desirable to have a projecting portion 69A. 10(a) and 12(a), of the portion 68A located in the first region Q1, the protruding portion 69A protrudes from the tip of the folded portion 71 of the top sheet 30 and the packaging sheet 58. and has a joint portion 60C where at least the upper surfaces of the tip portions of the folded portions 71 of the top sheet 30 and the packaging sheet 58 are joined to the proximal portion 69B, and the folded portions of the top sheet 30 and the packaging sheet 58 at the proximal portion 69B. A gather elastic member 63 is preferably provided also at a portion corresponding to the tip portion of the portion 70 .

<Description of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

・"Front-back direction" means the direction (longitudinal direction) indicated by symbol LD in the figure, and "width direction" means the direction (left-right direction) indicated by WD in the figure. are orthogonal.

・"Front side" means the side closer to the wearer's skin when the pants-type disposable diaper is worn, and the "back side" means the side farther from the wearer's skin when the pants-type disposable diaper is worn. .

・"Front surface" means the side of the member that is closest to the wearer's skin when wearing the pants-type disposable diaper, and the "back surface" means the side that is close to the wearer's skin when wearing the pants-type disposable diaper. means the far side.

・"Area ratio" means the ratio of the target portion to the unit area, and is expressed as a percentage by dividing the total area of the target portion (e.g., holes) in the target region (e.g., cover nonwoven fabric) by the area of the target region. is. In a form in which a large number of target portions are provided at intervals, it is desirable to determine the area ratio by setting the target region to a size that includes 10 or more target portions. For example, the pore area ratio can be measured by using, for example, VHX-1000 (trade name) manufactured by KEYENCE Co. under the following procedure under the measurement condition of 20 times.
(1) Set on a 20x lens and adjust the focus. Adjust the position of the non-woven fabric so that there are 4×6 holes.
(2) Designate the brightness of the area of the hole and measure the area of the hole.
(3) Click the color extraction of "area measurement" of "measurement/comment". Click on the part of the hole.
(4) Click "Batch measurement", check "Display measurement result window", and save as CSV data.

- "Elongation rate" means a value when the natural length is taken as 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.

- "Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and deionized water: 97.09 wt% 1.0 g of superabsorbent polymer is added to 49.0 g of the mixture) and stirred with a stirrer. The resulting gel is left in a constant temperature and humidity bath at 40° C. and 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500 manufactured by I. techno Engineering).

- "Matsuke" is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (test location: temperature 23±1° C., relative humidity 50±2%) to a constant weight. Pre-drying refers to making a sample or test piece constant weight in an environment at a temperature of 100°C. Fibers with an official moisture content of 0.0% do not need to be pre-dried. Using a sampling template (100 mm x 100 mm), a sample with dimensions of 100 mm x 100 mm is cut from the constant weight specimen. The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as basis weight.

・The “thickness” is automatically measured using an automatic thickness gauge (KES-G5 handy compression measurement program) under the conditions of a load of 0.098 N/cm ² and a pressurized area of 2 cm ² .

・The amount of water absorption is measured according to JIS K7223-1996 "Testing method for water absorption of superabsorbent resin".

・The water absorption rate is the "time to the end point" when JIS K7224-1996 "Test method for water absorption rate of superabsorbent polymer" is performed using 2g of superabsorbent polymer and 50g of physiological saline. .

- "Unfolded state" means a flat unfolded state without contraction or slack.

・Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

・If there is no description about environmental conditions for testing and measurement, the test and measurement shall be performed in a laboratory or equipment under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%). do.

The present invention can be applied to general disposable diapers such as tape-type disposable diapers and pad-type disposable diapers in addition to pants-type disposable diapers as in the above example, and can also be applied to other absorbent articles such as sanitary napkins. can also be applied.

A1... non-stretchable area, A2... stretchable area, FL... folding position, L... intermediate area, LD... front-back direction, Q0... area having absorber, Q1... first area, Q2... second area, Q3... third area region, T... waist region, U... lower waist portion, W... waist portion, WO... waist opening, 11... liquid-impermeable sheet, 12B... rear exterior body, 12F... front exterior body, 12H... inner sheet layer , 12S... Outer sheet layer, 13... Cover nonwoven fabric, 17... Waist elastic member, 18... Unnecessary elastic member, 30... Top sheet, 40... Intermediate sheet, 50... Absorbent element, 56... Absorbent body, 56N... Narrow part, 58... Packaging sheet 60... Raising gather 60A... Tip side portion 60B... Base side portion 60C... Joining portion 62... Gather nonwoven fabric 63... Gather elastic member 67... Laying portion 68... Free portion 69A... Protruding portion 69B... Adjacent portion 70... Folded portion 72... Non-folded portion 200... Inner body 201, 202... Internal and external joints.

Claims (6)

Having a crotch portion, a front portion positioned forward of the crotch portion, and a rear portion positioned rearward of the crotch portion,
Absorbers provided in the front part, the crotch part and the rear part;
one or more coating layers covering at least the front side of the absorbent body;
A riser gather that rises to the front side and is provided from the front part to the rear part through both sides of the crotch part;
In an absorbent article comprising
The absorbent body has a constricted portion narrower in width than both front and rear sides in the middle in the front-rear direction,
The region having the absorbent body has a first region located in the range in the front-rear direction having the constricted portion , and second regions located on both front and rear sides of the first region,
The second region includes a folded portion in which both side portions of the absorbent body and both side portions of the coating layer are folded back integrally to the front side , and a non-folded portion located between the folding positions of the folded portions. is an area with
The first region includes a folded portion in which both side portions of the absorbent body are not folded back to the front side and both side portions of the covering layer are folded back to the front side, and a non-folded portion located between the folding positions of the folded portions. and
Part or all of the folded portion of the second region is fixed to a surface facing the folded portion of the second region in the non-folded portion of the second region,
The rising gathers are composed of a root portion fixed to the back side of each non-folded portion of the first region and the second region, and a root portion extending from the root portion to each folded portion of the first region and the second region. a body portion extending laterally over each folded portion of the first region and the second region;
The rising gathers include a lying down portion fixed to the upper surface of the folded portion of the second region in a lying state at both front and rear ends of the main body portion, and a portion between the front and rear lying down portions of the main body portion, which is the first It has a free portion configured to be raised without being fixed to the upper surface of the folded portion of one region, and a gathered elastic member provided along the front-rear direction at the tip of the free portion.
An absorbent article characterized by: Having a crotch portion, a front portion positioned forward of the crotch portion, and a rear portion positioned rearward of the crotch portion,
Absorbers provided in the front part, the crotch part and the rear part;
one or more coating layers covering at least the front side of the absorbent body;
A riser gather that rises to the front side and is provided from the front part to the rear part through both sides of the crotch part;
In an absorbent article comprising
The absorbent body has a constricted portion narrower in width than both front and rear sides in the middle in the front-rear direction,
The region having the absorbent body includes a first region located in the range in the front-rear direction having the constricted portion, a second region located on either front or rear side of the first region, and a second region of the first region. a third region located on the opposite side of the region;
The second region has a folded portion in which both side portions of the absorbent body and both side portions of the coating layer are folded back integrally to the front side, and a non-folded portion located between the folded portions of the folded portions. and
The first region and the third region are located between a folded portion in which both side portions of the absorbent body are not folded back to the front side and both side portions of the covering layer are folded back to the front side, and folding positions of these folded portions. A region having a non-folded portion,
Part or all of the folded portion of the second region is fixed to a surface facing the folded portion of the second region in the non-folded portion of the second region, and part or all of the folded portion of the third region is fixed. is fixed to the surface facing the folded portion of the third region in the non-folded portion of the third region,
The rising gathers include root portions fixed to the back side of both side portions of the non-folded portions of the first region, the second region, and the third region, and the root portions extending from the root portions to the first region and the second region. and a main body portion extending over each folded portion of the first region, the second region, and the third region via the side of each folded portion of the third region,
The rising gathers are formed by fixing the front and rear ends of the main body portion to the upper surfaces of the folded portions of the second region and the third region in a fallen state, and between the front and rear fallen portions of the main body portion. has a free portion configured to be raised without being fixed to the upper surface of the folded portion of the first region, and a gathered elastic member provided along the front-rear direction at the tip of the free portion. are doing,
An absorbent article characterized by : A portion of the rising gathers located in the second region includes the free portion,
The portion of the main body portion of the rising gather located in the second region includes a proximate portion adjacent to the side surface and upper surface of the folded portion of the second region, and a portion extending from the proximate portion to the folded portion of the second region. and a protruding portion that protrudes;
At least a portion of the folded portion of the second region on the side of the first region is not fixed to a surface facing the folded portion of the second region in the non-folded portion of the second region ,
The adjacent portion of the rising gather extends to the tip of the folded portion,
The protruding portion of the rising gather protrudes from the tip of the folded portion,
a joint portion where at least the upper surface of the tip portion of the folded portion and the adjacent portion of the rising gather are joined;
A gathering elastic member is also provided at a portion corresponding to the tip of the folded portion in the adjacent portion of the rising gathers ,
3. The absorbent article according to claim 1 or 2 . The rising gathers extend from the second region to the waist side,
The lying portion of the rising gather includes a portion located in the second region and a portion located on the waist side of the second region,
At least a portion of the first region side of the portion overlapping the fallen portion in the folded portion of the second region is fixed to the surface facing the folded portion of the second region in the non-folded portion of the second region. not
The absorbent article according to claim 3. A plurality of the joints are provided at intervals in at least the front-rear direction,
5. The absorbent article according to claim 3 or 4. a front exterior body that constitutes at least a waist-surrounding portion of the front front body and a rear exterior body that constitutes at least a waist-surrounding portion of the back body; An exterior body and an interior body provided in the rear exterior body are provided, and side seal portions, waist openings, and leg openings are formed by joining both side portions of the front side exterior body and both side portions of the rear side exterior body. a fitted pants-type disposable diaper,
The inner body has the crotch portion, the front portion, the rear portion, the absorbent body, the covering layer, and the sit-up gathers,
The absorbent article according to any one of claims 1-5.

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