JP7227109B2 - absorbent article - Google Patents

Description

The present invention mainly relates to absorbent articles such as sanitary napkins, pantyhose sheets, incontinence pads, and toiletries. The present invention relates to an absorbent article in which three-dimensional gathers are formed.

Conventionally, the absorbent article is made of cotton-like pulp or the like between a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric and a liquid-permeable top sheet such as a nonwoven fabric or a permeable plastic sheet. There is known one in which an absorber is interposed.

In particular, in sanitary napkins for night use, in order to prevent side leakage, in which body fluid such as menstrual blood flows in the width direction and leaks from the side edges while worn, the longitudinal sides on the side of the skin contact surface are provided with Many products with three-dimensional gathers protruding to the side are provided on the market.

As the three-dimensional gathers, the widthwise inner side portion of the nonwoven fabric for forming the gathers is folded in two or three in the widthwise direction and fixed to the absorbent body side at both ends in the longitudinal direction of the absorbent article. There is an upright wall-shaped three-dimensional gather that rises on the skin side so that the tip forms a free end at the intermediate portion. Further, in the following Patent Documents 1 and 2, the elastic stretchable portion is connected to the upper end portion of the base wall portion and includes a planar elastic stretchable portion that abuts on the wearer's skin when worn, forming a substantially T-shaped cross section. Disclosed are three-dimensional gathers that stand up as follows.

In addition, loop-shaped three-dimensional gathers that form a hollow loop shape and protrude toward the skin are also widely known (for example, Patent Documents 3 and 4 below).

Patent No. 3871563 publication Japanese Patent No. 5395630 Japanese Patent No. 5123583 Japanese Patent No. 5119041

The above-mentioned two-fold or three-fold standing wall-shaped three-dimensional gathers and the three-dimensional gathers with a substantially T-shaped cross section disclosed in the above-mentioned Patent Documents 1 and 2 have the advantage that the standing height to the skin side can be increased. However, it has the drawback that it tends to fall down in the width direction, and when it is worn in a fallen state, it causes leakage of bodily fluids and discomfort. As a technique for preventing such tilting in the width direction, in Patent Document 1, a plurality of elastic members arranged along the longitudinal direction in a planar elastic expansion/contraction portion are arranged to generate contraction force on the inner side in the width direction. is greater than the contractile force on the outer side in the width direction, and is curved so as to be convex outward. It is described to locally form a mid-region elastic elastic fixation that is fixed to the body and inhibits the erection of the base wall.

However, even if the contractile forces of the elastic members on the inner side and the outer side in the width direction are changed as described in Patent Document 1, the three-dimensional gathers are less likely to bend in the width direction, and this is sufficiently satisfactory for preventing collapse in the width direction. Sometimes it didn't work out.

In addition, in Patent Document 2, since the fixing portion of the central region elastic stretchable portion is formed locally, the standing up of the three-dimensional gathers is inhibited at this fixing portion, and the adhesion with the skin at this fixing portion is reduced. A leak could have occurred.

On the other hand, the loop-shaped three-dimensional gathers as described in Patent Documents 3 and 4 described above are less likely to collapse in the width direction, but the loop-shaped three-dimensional gathers are easily crushed by body pressure when worn, and are particularly susceptible to body fluids. By receiving leg pressure from the outside in the width direction at the discharge part, the loop-shaped three-dimensional gathers tend to bulge inward in the width direction. If such deformation inward in the width direction occurs, leakage may occur when the amount of bodily fluid discharged is large.

Therefore, the main object of the present invention is to provide an absorbent article having hollow loop-shaped three-dimensional gathers, which prevents leakage of bodily fluids by suppressing the three-dimensional gathers from bulging inward in the width direction. to provide.

In order to solve the above-mentioned problems, as a first mode, the width direction inner side portions are folded in the width direction on both sides in the longitudinal direction on the side of the skin contact surface, and the folded portions extend along the longitudinal direction and in the width direction. By arranging a plurality of elastic elastic members at intervals, a hollow loop-shaped three-dimensional gather projecting to the wearer's skin side is formed in the longitudinal section including the region corresponding to the wearer's bodily fluid discharge part. A sheet member is arranged,
The elastic stretchable member is fixed to the sheet member at the front end and the rear end of the sheet member, respectively, and end fixing portions are formed in which the folded portion of the sheet member is fixed to the absorbent body side, A non-stretchable portion in which the loop-shaped three-dimensional gather is formed in a longitudinally intermediate portion of the sheet member, and the elastic stretchable member is fixed to the sheet member between the end fixing portion and the loop-shaped three-dimensional gather, respectively. is formed and
In the loop-shaped three-dimensional gathers, the elastic force effective length at which the elastic expansion/contraction member exerts expansion/contraction force is longer for the elastic expansion/contraction member arranged on the outside in the width direction than for the elastic expansion/contraction member arranged on the inside in the width direction. An absorbent article is provided.

In the first aspect, the end fixing portions are formed at the front end and the rear end of the sheet member, respectively, and the loop-shaped three-dimensional gather is formed at the intermediate portion in the longitudinal direction, and the end fixing portion and the loop are formed. A non-stretchable portion is formed between the three-dimensional gathers. That is, the loop-shaped three-dimensional gathers at the longitudinal intermediate portion protrude toward the skin with the end fixing portions at the front and rear ends as base ends, and the stretching force of the elastic stretchable member is expressed between the end fixing portions. A non-stretchable portion is interposed so that the flexibility is suppressed and the sheet member is not fixed and can move freely. In the loop-shaped three-dimensional gathers, the elastic stretchable members arranged on the outer side in the width direction have a longer effective stretchable force length at which the elastic stretchable members exert the stretchable force than the elastic stretchable members arranged on the inner side in the width direction. It's becoming For this reason, in the loop-shaped three-dimensional gathers, the elastic force of the elastic expansion/contraction member acts on a longer section on the outer side in the width direction, making it easier to bulge and deform to the outer side in the width direction. Since the non-stretchable part in which the elastic force expression of the elastic stretchable member is suppressed and the restraint of the sheet member is reduced is provided between the end fixing part and the non-stretchable part is the buffer region As a result, the loop-shaped three-dimensional gathers in the center are less likely to be restricted by the fixed end portions, and can move relatively freely. This makes it easier for the loop-shaped three-dimensional gathers to bulge outward in the width direction, suppress the three-dimensional gathers from collapsing inward in the width direction, and prevent leakage of bodily fluids.

As a second aspect, at least the non-stretchable portion on the front side has a non-stretchable length, which is the length along the longitudinal direction of the absorbent article of the non-stretchable portion, longer on the inner side in the width direction than on the outer side in the width direction. An absorbent article is provided.

In the second aspect, at least in the non-stretchable portion on the front side, the non-stretchable length is longer on the inner side in the width direction than on the outer side in the width direction. By increasing the non-stretchable length, the degree of freedom of deformation of the adjacent loop-shaped three-dimensional gathers increases, and the widthwise inner sides of the loop-shaped three-dimensional gathers are more likely to bulge and deform than the widthwise outer sides. In addition, by forming at least the front non-stretchable portion in this manner, the front portion of the loop-shaped three-dimensional gather is easily deformed to bulge outward, so that leakage in the front portion can be more reliably prevented. Become.

As a third aspect, there is provided an absorbent article in which the edges of the end fixing portions on the center side in the longitudinal direction are formed by straight lines substantially parallel to the width direction.

In the third aspect, the edge of the end fixing portion on the center side in the longitudinal direction is formed by a straight line substantially parallel to the width direction. In this embodiment, the non-stretchable length of the non-stretchable portion is longer on the inner side in the width direction than on the outer side in the width direction by forming the edges of the loop-shaped three-dimensional gathers in a slanted shape, and the loop-shaped three-dimensional gathers are formed on the inner side in the width direction. The degree of freedom of deformation of can be increased.

As a fourth aspect, there is provided an absorbent article in which the edges of the end fixing portions on the longitudinal center side are inclined outward in the width direction toward the longitudinal center side.

In the fourth aspect, since the edge of the end fixing portion on the longitudinal center side is formed in an inclined shape toward the width direction outer side and inclined toward the longitudinal direction center side, the end of the loop-shaped three-dimensional gather is formed. Even if the edge is not formed in an inclined shape, the non-stretchable length of the non-stretchable portion can be made longer on the inner side in the width direction than on the outer side in the width direction, and the loop-shaped three-dimensional gathers can be more reliably formed on the inner side in the width direction. It becomes possible to increase the degree of freedom of deformation.

As a fifth aspect, wing-shaped flaps are formed on both sides to be fixed so as to involve the crotch portion of the underwear when worn, and on both sides on the rear side thereof, the inner surface of the buttocks of the underwear when worn. A flap for the hip hold fixed to the side is formed,
Of the elastic stretchable members arranged in the loop-shaped three-dimensional gathers, the elastic stretchable member arranged on the innermost side in the width direction has a front end located forward of the front edge of the wing-shaped flap, and a rear end thereof. The elastic stretchable member, which is positioned rearward from the rear edge of the wing-shaped flap and is arranged on the outermost side in the width direction, has a rear end positioned forward from the maximum protrusion in the width direction of the hip hold flap. A sitting absorbent article is provided.

In the fifth aspect, the front end and the rear end of the elastic stretchable member arranged on the innermost side in the width direction of the elastic stretchable members arranged in the loop-shaped three-dimensional gather are respectively the front edge and the rear edge of the wing-shaped flap. The rear end of the elastic expansion/contraction member that is located outside the edge and is arranged on the outermost side in the width direction is located in front of the maximum projecting portion in the width direction of the hip hold flap. This makes it easier for the loop-shaped three-dimensional gathers to bulge outward in the width direction in the region corresponding to the body fluid discharge part of the wearer, and the fit to the buttocks is improved.

As described in detail above, according to the present invention, it is possible to prevent the three-dimensional gathers from bulging inward in the width direction, thereby preventing leakage of bodily fluids.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partially broken development view of the sanitary napkin 1 which concerns on this invention. FIG. 2 is a view taken along line II-II of FIG. 1; FIG. 2 is a view taken along line III-III in FIG. 1; FIG. 2 is an enlarged cross-sectional view (view along the line IV-IV in FIG. 1) showing the widthwise inner side portion of the gather sheet 7 in the loop-shaped three-dimensional gather 10 portion with the elastic stretchable member stretched. FIG. 2 is an enlarged cross-sectional view (view along line V-V in FIG. 1) showing the width direction inner side portion of the gather sheet 7 in the end fixing portions 11 and 12; Fig. 2 is an enlarged cross-sectional view (view along the line VI-VI in Fig. 1) showing the width direction inner side portion of the gather sheet 7 in the non-stretchable portions 13, 14; Fig. 2 is a plan view of the sanitary napkin 1 showing joints; FIG. 10 is a perspective view showing a joined state of the inner side portion in the width direction of the gather sheet 7; FIG. 4 is an exploded view of a sanitary napkin 1 according to a modified example; FIG. 4 is an exploded view of a sanitary napkin 1 according to a modified example; FIG. 4 is an exploded view of a sanitary napkin 1 according to a modified example;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of sanitary napkin 1]
As shown in FIGS. 1 to 3, a sanitary napkin 1 according to the present invention includes a liquid-impermeable back sheet 2 made of a polyethylene sheet or the like, and menstrual blood or vaginal discharge (hereinafter collectively referred to as body fluids). ), an absorbent body 4 made of cotton pulp or synthetic pulp interposed between the two sheets 2 and 3, and longitudinal Within a predetermined section in the longitudinal direction of the napkin ( gather sheets 7, 7 (sheet members) forming a pair of left and right loop-shaped three-dimensional gathers 10, 10 protruding toward the skin in a section corresponding to the wearer's crotch part), and around the absorber 4 , the outer edges of the liquid-impermeable backsheet 2 and the liquid-permeable topsheet 3 are joined at the front and rear edges thereof by a joining means such as a hot-melt adhesive, heat sealing, or ultrasonic sealing, The liquid-impermeable back sheet 2 extending laterally beyond the absorber 4 and the gather sheet 7 are joined together by adhesive such as hot melt, heat sealing, ultrasonic sealing or the like. A pair of left and right wing-shaped flaps W, W extending outward are formed at positions on the side of the absorbent body substantially corresponding to the bodily fluid discharge part H, and on both sides of the rear part on the rear side (buttock side) from this. A pair of left and right rear flaps W _B and W _B extending outward are formed in each of the parts. In the illustrated example, the absorbent body 4 is surrounded by an enveloping sheet 5 made of crepe paper or non-woven fabric in order to retain the shape of the absorbent body 4 and improve diffusion. It doesn't have to be. Further, although not shown, a second sheet made of a hydrophilic non-woven fabric or the like having substantially the same shape as the liquid-permeable surface sheet 3 may be arranged adjacent to the non-skin side of the liquid-permeable surface sheet 3 . .

The structure of the sanitary napkin 1 will be further detailed below.
For the liquid-impermeable backsheet 2, a sheet material having at least water impermeability, such as polyethylene, is used. The water-impervious/moisture-permeable sheet material is produced by melting and kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet uniaxially or biaxially. A sheet is preferably used. On the non-skin side (outer surface) of the liquid-impermeable back sheet 2, one or more adhesive layers (not shown) are formed along the longitudinal direction of the napkin so that the sanitary napkin 1 can be attached to the body when the sanitary napkin 1 is worn. It is designed to be attached to the underwear. As the liquid-impermeable backsheet 2, a polylaminated nonwoven fabric obtained by laminating a plastic film and a nonwoven fabric may be used.

Next, for the liquid-permeable surface sheet 3, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is preferably used. The material fibers that make up the nonwoven fabric include synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, as well as recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a method, a spunbond method, a thermal bond method, a meltblown method, a needle punch method, or the like can be used. Among these processing methods, the spunlace method is superior in flexibility and drapeability, and the thermal bond method is superior in bulkiness and compression recovery. When a large number of through-holes are formed in the liquid-permeable surface sheet 3, body fluids are rapidly absorbed, and the dry touch is excellent. The fibers of the non-woven fabric may be either long fibers or short fibers, but preferably short fibers are used in order to produce the feel of a terry cloth. Also, in order to facilitate embossing, it is preferable to use olefin fibers such as polyethylene or polypropylene having a relatively low melting point. In addition, composite fibers of core-sheath type fibers, side-by-side type fibers, and split type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath can also be preferably used.

The absorbent body 4 interposed between the liquid-impermeable backsheet 2 and the liquid-permeable topsheet 3 is made of, for example, cotton-like pulp and a water-absorbent polymer. The water-absorbing polymer is mixed in the pulp constituting the absorbent body, for example, as granular powder. Examples of the pulp include chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp with a longer fiber length is more functional and functional than hardwood pulp. It is preferably used in terms of price. The basis weight of the absorbent body 4 is preferably 300 to 750 g/m ² , preferably 300 to 400 g/m ² .

Synthetic fibers may also be mixed in the absorber 4 . For the synthetic fibers, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. A mixture may also be used. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers having a high-melting-point fiber as a core and a low-melting-point fiber as a sheath can also be used. In the case of hydrophobic fibers, the synthetic fibers are preferably surface-treated with a hydrophilizing agent so as to have affinity for body fluids.

On the side of the skin contacting surface of the absorbent body 4, a napkin elongated in the longitudinal direction and increased in thickness toward the skin side is provided in a widthwise central portion including a region corresponding to the bodily fluid discharge portion H of the wearer. It is preferable to have a raised portion 6 of the absorbent body. The mid-high portion 6 is provided so as to generally cover the portion from the bodily fluid discharge portion H of the wearer to the starting position of the gluteal groove, and is provided in the longitudinal section from the wing-shaped flap W to the intermediate portion of the rear flap _WB . there is The mid-high portion 6 may be formed by stacking fibers integrally with the absorbent body 4, or may be formed by stacking fibers that are stacked separately. The thickness of the mid-high portion 6 is preferably 3 to 20 mm, preferably 5 to 15 mm, because if it is too thick, the rigidity of the absorbent body 4 increases and the adhesion to the body decreases. When the absorbent body 4 is surrounded by the wrapping sheet 5, the absorbent body 4 and the mid-high portion 6 may be integrally wrapped as shown in FIG. 4 and the mid-high portion 6 may be individually wrapped with the wrapping sheet and then laminated.

On the other hand, in the illustrated example, the width dimension of the liquid-permeable surface sheet 3 is slightly longer than the width dimension of the absorbent body 4, as shown in the cross-sectional views of FIGS. The gathering sheet 7 separates from the liquid-permeable surface sheet 3 on the outer side thereof, specifically, prevents permeation of menstrual blood and vaginal discharge, or enhances the feeling of touch. A gathered sheet 7 made of a non-woven fabric material that has been appropriately water-repellent or hydrophilically treated is arranged according to the purpose of (1).

The gathered sheet 7 may be made of natural fibers, synthetic fibers, regenerated fibers, or the like, and may be formed by an appropriate processing method. Therefore, it is better to use a soft nonwoven fabric with a low basis weight and air permeability. In particular, it is preferable to use a nonwoven fabric that is soft and comfortable to the touch even when it comes into contact with the skin in a state of protruding high toward the skin due to the contractile force of the elastic member. Specifically, it is desirable to use a non-woven fabric produced by the spunbond method with a basis weight of 13 to 23 g/m ² , and in order to reliably prevent permeation of body fluids, silicon-based, paraffin-based, alkylchromic chloride A water-repellent nonwoven fabric coated with a water-repellent agent or the like is preferably used.

As shown in FIGS. 2 and 3, the gather sheet 7 is adhered by hot-melt or the like to the outer portion of the widthwise intermediate portion over the range from a predetermined inner position to the outer edge of the liquid-impermeable backsheet 2 . A predetermined flap portion is formed at a predetermined position by bonding with an adhesive. This flap portion has a pair of left and right wing-shaped flaps W, W on both sides of a portion substantially corresponding to the bodily fluid discharge portion H, and rear flaps W _B , _WB is formed. A longitudinal section including the wing-shaped flaps W corresponds to the crotch portion of the wearer. An adhesive _layer (not shown) is provided on each of the outer surface sides (liquid-impermeable back sheet 2 side) of these wing-shaped flaps W, W and rear flaps W _B , W B . The flaps W, W are folded back to the opposite side at the folding line RL of the base end, wrapped around the crotch portion of the shorts and fastened, and the rear flap _WB is fastened to the inner surface of the shorts. there is

[Loop-shaped three-dimensional gather]
The loop-shaped three-dimensional gathers 10 are formed by folding the inner side portion in the width direction of the gather sheet 7 almost double, and fixing both ends or appropriate positions in the longitudinal direction inside the double sheet. In the illustrated example, four elastic stretchable members 15, 15, . By joining the parts at the joining portion, the longitudinal section including the region corresponding to the bodily fluid discharge portion H of the wearer is formed in a hollow shape protruding toward the wearer's skin side. As shown in FIG. 3, the elastic members 15 are fixed at the front end portion and the rear end portion of the inside portion of the gather sheet 7 in the width direction, and the gather sheet 7 is appropriately folded. A front side end fixing portion 11 and a rear side end fixing portion 12 are formed by bonding the folded portion to the absorbent body 4 side in a folded state, and the front side end fixing portion 11 and the rear side end fixing portion 12 are formed. By forming a front non-stretchable portion 13 and a rear non-stretchable portion 14 in which the elastic stretchable members 15 are fixed to the gathered sheet 7, respectively, between the loop-shaped three-dimensional gathers 10, at least the body fluid discharge portion H is formed. As shown in FIG. 2, a pair of left and right loop-shaped three-dimensional gathers 10, 10 projecting toward the skin are formed in a predetermined section in the napkin longitudinal direction corresponding to the wearer's crotch portion. As a result, the inner portion of the gathered sheet 7 in the width direction includes, in order from the front side, the front end fixed portion 11, the front non-stretchable portion 13, the loop-shaped three-dimensional gathers 10, the rear non-stretchable portion 14, and the rear end fixed portion. A portion 12 is formed continuously.

More specifically, the structure of the inner portion of the gather sheet 7 in the width direction will be described. Elastic members 15 are arranged along the longitudinal direction of the sanitary napkin 1, and as shown in FIGS. A first folded portion 20 extending inward in the width direction and folded back toward the wearer's skin at the inner position in the width direction; In addition, in a state of being folded in three by the second folded portion 21 folded back to the non-skin side of the wearer at the outer position in the width direction, the first sheet portion 22 and the second sheet portion in order from the non-skin side of the wearer. 23 and a third seat portion 24 are formed. The elastic members 15 are mainly arranged on the third sheet portion 24 .

As shown in FIGS. 7 and 8 , the first sheet portion 22 is positioned slightly outside the first folded portion 20 in the width direction, and is stretched over the entire length in the longitudinal direction on the non-skin side of the wearer. The first joint portion 25 is joined to the member (liquid-permeable surface sheet 3) placed in the first A second joint portion 26 that joins the sheet portion 22 , and a third joint portion 27 that joins both ends of the third sheet portion 24 in the longitudinal direction to the second sheet portion 23 . In addition, in the present embodiment, fourth joints 28 are provided for joining both ends in the longitudinal direction of the first sheet portion 22 to the liquid-permeable surface sheet 3 at positions near the first folded portions 20 . . The boundary between the fourth joint portion 28 and the first joint portion 25 does not necessarily have to be clear, and may be connected in the width direction. In this case, from the section in which only the first joint 25 exists in the middle portion in the longitudinal direction, the first joint 25 and the fourth joint are bounded by extension lines extending the side edges of the first joint 25 to both ends in the longitudinal direction. 28 can be distinguished. 7(A) is a plan view showing the joint portions (the first joint portion 25 and the fourth joint portion 28) between the first sheet portion 22 and the liquid-permeable surface sheet 3, and FIG. A plan view showing a joint portion (the second joint portion 26) between the second sheet portion 23 and the first sheet portion 22, and FIG. It is a top view which shows said 3rd joint part 27).

At least the third sheet portion 24 is worn with the first joint portion 25 and the second joint portion 26 as proximal ends in the longitudinal section between the third joint portions 27, 27 provided at both ends in the longitudinal direction. A hollow loop-shaped three-dimensional gather 10 protruding toward the skin of the person is formed. That is, the loop-shaped three-dimensional gathers 10 protrude toward the skin side so as to form a hollow loop shape with the two first and second joint portions 25 and 26 separated in the width direction as base ends.

In the width direction inner side portion of the gathered sheet 7 configured as described above, the front side end portion and the rear side end portion are formed as the front side end fixing portion 11 and the rear side end fixing portion 12, respectively. , the elastic stretchable members 15 are fixed inside the double sheet of the gather sheet 7 over their entire lengths with an adhesive, thereby suppressing the stretchability of the elastic stretchable members 15. Deformation of the gathers sheet 7 is suppressed by fixing the double sheets of the gathers sheet 7 to the absorber 4 side by the third joint portion 27 in an appropriately folded state. The front end fixing portion 11 and the rear end fixing portion 12 are respectively formed continuously from the front end and the rear end of the sanitary napkin 1 toward the central side in the longitudinal direction of the napkin with a predetermined length. The lengths of the front end fixing portion 11 and the rear end fixing portion 12 along the napkin longitudinal direction are arbitrary, but as shown in FIG. It is preferable to make it longer than the fixing part 11 .

In addition, the front non-stretchable portion 13 and the rear non-stretchable portion 14 formed continuously on the rear side of the front end fixing portion 11 and the front side of the rear end fixing portion 12, respectively, are shown in FIG. As described above, the elastic stretchable members 15 are fixed inside the double sheet of the gather sheet 7 over their entire lengths with an adhesive, thereby suppressing the stretchability of the elastic stretchable members 15 . On the other hand, the gather sheet 7 is only joined at the first joint portion 25 and the second joint portion 26 in the same manner as the loop-shaped three-dimensional gathers 10 portion, and is deformed compared to the loop-shaped three-dimensional gathers 10 portion. The degree of freedom is slightly reduced by joining the elastic members 15, but the degree of restraint is not increased by joining the sheet itself, and almost the same degree of freedom of deformation as that of the loop-shaped three-dimensional gathers 10 is ensured. It is

The loop-shaped three-dimensional gathers 10 formed in the region sandwiched between the front non-stretchable portion 13 and the rear non-stretchable portion 14 protrude toward the wearer's skin by the stretching force of the elastic stretchable members 15, forming a hollow loop shape. to form a three-dimensional gather. The loop-shaped three-dimensional gathers 10 protrude toward the skin with front end fixing portions 11 and rear end fixing portions 12 at both ends as base ends. Since the front non-stretchable portion 13 and the rear non-stretchable portion 14 are interposed between them, the front non-stretchable portion 13 and the rear non-stretchable portion 14 serve as buffer regions, and the fixed portions 11 and 12 The effect of restraint on the loop-shaped three-dimensional gathers 10 is reduced, and the degree of freedom of deformation of the loop-shaped three-dimensional gathers 10 is increased.

As shown in FIG. 1, in the loop-shaped three-dimensional gather 10, the elastic force effective length at which the elastic elastic members 15 exert elastic force is arranged on the outer side in the width direction of the elastic elastic members 15 arranged on the inner side in the width direction. The extended elastic member 15 is longer. In the illustrated example, the elastic force effective length Lo of the outermost elastic elastic member 15 is larger than the elastic force effective length Li of the innermost elastic elastic member 15 among the four elastic elastic members 15 . (Li<Lo), and the elastic force effective lengths of the elastic members 15, 15 disposed between them are formed to gradually change.

In this way, the effective length of elastic force of the elastic members 15 arranged on the outer side in the width direction is longer than that of the elastic members 15 arranged on the inner side in the width direction. The stretch force of the elastic stretchable member 15 acts on the longer section on the outer side, making it easier for the loop-shaped three-dimensional gathers 10 to bulge outward in the width direction, and the front end fixing portions 11 at both ends and the rear end The front non-stretchable part 13 and the rear non-stretchable part 14, in which the expression of the stretching force of the elastic stretchable members 15 is suppressed, respectively, move freely without the gathered sheet 7 being fixed. Since the central loop-shaped three-dimensional gathers 10 are provided in a state where they can be moved, they can move relatively freely in a state where they are not easily affected by the restraints of the end fixing portions 11 and 12 . As a result, as shown in FIGS. 1 and 2, the loop-shaped three-dimensional gathers 10 are easily deformed to bulge outward in the width direction. can be prevented from falling inward in the width direction, and leakage of bodily fluids can be prevented.

The elastic members 15 arranged in the loop-shaped three-dimensional gathers 10 are preferably arranged at substantially equal intervals along the width direction, but the arrangement intervals may be changed in order to adjust the elastic force acting on the three-dimensional gathers. good. The interval between adjacent elastic stretchable members 15, 15 is preferably 10 to 50 mm, preferably 10 to 20 mm. The elastic stretchable members 15 may have a substantially constant stretching force with a constant elongation rate, thickness, arrangement interval, etc., or may be formed so that the stretching force on the outside in the width direction is greater than the stretching force on the inside in the width direction. You may The elastic force can be increased by increasing the elongation rate of the elastic elastic member 15, increasing the thickness, narrowing the arrangement interval, or by combining two or more.

It is preferable that at least the front edges of the elastic members 15 arranged on the outside in the width direction are positioned more frontward than those arranged on the inside in the width direction. In other words, the front edge of the loop-shaped three-dimensional gathers 10 should be formed so that the line formed by connecting the ends of the adjacent elastic stretchable members 15 gradually inclines outward toward the front side. preferable. On the other hand, the rear edges of the elastic members 15 may be arranged so that the lines formed by connecting the ends of the adjacent elastic members 15 are substantially parallel to the width direction. You may make it the shape which inclines outward gradually as it goes to the direction.

In the loop-shaped three-dimensional gather 10, the ratio Li/Lo of the elastic force effective length Li of the elastic expansion/contraction member 15 arranged innermost in the width direction to the elastic force effective length Lo of the elastic expansion/contraction member 15 arranged outermost is 0.2 to 0.8, preferably 0.4 to 0.6, from the viewpoint of appropriately expanding and deforming the loop-shaped three-dimensional gathers 10 to the outside in the width direction.

In addition, at least in the front non-stretchable portion 13, the non-stretchable length, which is the length along the napkin longitudinal direction of the front non-stretchable portion 13, is the non-stretchable length Mo on the outside in the width direction. Preferably, Mi is longer (Mo<Mi). In the embodiment shown in FIG. 1, both the front non-stretchable portion 13 and the rear non-stretchable portion 14 have the aforementioned non-stretchable length Mo<Mi relationship, but as shown in FIG. If at least the front non-stretchable portion 13 has the aforementioned relationship of non-stretchable length Mo<Mi, the rear non-stretchable portion 14 has a non-stretchable length Mo on the outer side in the width direction and a non-stretchable length on the inner side in the width direction. Mi may be formed substantially the same. By forming at least the front non-stretchable portion 13 so that the non-stretchable length Mo<Mi described above, the front portion of the loop-shaped three-dimensional gathers 10 tends to bulge outward, and when the body fluid discharge amount is large. Leakage at the front portion, which tends to occur in the

As shown in FIG. 1, the edges of the front end fixing portion 11 and the rear end fixing portion 12 on the central side in the longitudinal direction can be formed by straight lines substantially parallel to the width direction. That is, the edge of the third joint portion 27 on the center side in the longitudinal direction is formed by a straight line substantially parallel to the width direction. By forming the edges of the end fixing portions 11 and 12 on the central side in the longitudinal direction with a straight line substantially parallel to the width direction in this manner, the third joint portion 27 can be easily arranged and manufacturing is facilitated. In this embodiment, at least the front end portions of the elastic stretchable members 15 arranged in the loop-shaped three-dimensional gathers 10 are inclined, so that the non-stretchable length of at least the front non-stretchable portion 13 is increased in the width direction from the outside in the width direction. It can be formed to be longer on the inside.

Further, as shown in FIG. 10, the edges of the front side end fixing portion 11 and the rear side end fixing portion 12 on the central side in the longitudinal direction are inclined toward the outer side in the width direction and inclined toward the central side in the longitudinal direction. may be formed. That is, the edge of the third joint portion 27 on the central side in the longitudinal direction may be formed in an inclined shape. As a result, even if the edges of the loop-shaped three-dimensional gathers 10 are not inclined, the non-stretchable lengths of the non-stretchable portions 13 and 14 can be longer on the inner side in the width direction than on the outer side in the width direction (Mo< Mi) On the inner side in the width direction, the degree of restraint in the non-stretchable portions 13 and 14 is low, and the degree of freedom of deformation of the loop-shaped three-dimensional gathers 10 can be increased.

As shown in FIG. 11, among the elastic stretchable members 15 arranged in the loop-shaped three-dimensional gathers 10, the elastic stretchable member 15 arranged on the innermost side in the width direction has a front end extending from the front edge of the wing-shaped flap W. It is preferably located on the front side, and the rear end is located on the rear side of the rear edge of the wing-shaped flap W. It is preferably positioned forward of the maximum protrusion in the width direction of the maximum protrusion _WB in the direction. This makes it easier for the loop-shaped three-dimensional gathers 10 to bulge outward in the width direction in the region corresponding to the bodily fluid discharge part H of the wearer, and to improve the fit on the buttocks. The front edge and the rear edge of the wing-shaped flap W are portions where the proximal end of the wing-shaped flap W starts to protrude outward in the width direction. This is the portion where the separation width of the outline is the smallest. Further, the maximum widthwise protrusion of the hip hold flap _WB is the portion behind the wing-shaped flap W where the separation width between the left and right contour lines is maximum. The separation width Sa between the front end of the elastic stretchable member 15 on the inner side in the width direction and the front edge of the wing-shaped flap W is preferably 0 to 30 mm, and the rear end of the elastic stretchable member 15 on the inner side in the width direction and the wing-shaped flap. The separation width Sb between W and the rear edge is preferably 0 to 30 mm. Further, the separation width Sc between the rear end of the elastic stretchable member 15 on the outer side in the width direction and the maximum protrusion in the width direction of the hip hold flap _WB is preferably 0 to 120 mm.

In the embodiment shown in FIG. 1, the lengths of the front non-stretchable portion 13 and the rear non-stretchable portion 14 in the napkin longitudinal direction are formed to be substantially equal, but as shown in FIG. The portion 14 may be formed relatively long. In FIG. 11, the loop-shaped three-dimensional gathers 10 are formed only slightly longer in the region corresponding to the wearer's bodily fluid discharge portion H and in the front and rear thereof, and most of the hip hold flaps _WB on the rear side thereof are not rearward. An elastic part 14 is arranged. As a result, the folded portion on the inner side in the width direction of the gathered sheet 7 that does not stand up on the skin side fits the buttocks of the wearer, and the loop-shaped three-dimensional gathers 10 projecting on the skin side in the region corresponding to the bodily fluid discharge portion H. Since it fits well, it is possible to prevent side leakage at the body fluid discharge part H and to improve the fit to the buttocks.

DESCRIPTION OF SYMBOLS 1... Sanitary napkin, 2... Liquid-impermeable back sheet, 3... Liquid-permeable top sheet, 4... Absorbent body, 5... Enveloping sheet, 6... Mid-high part, 7... Gather sheet, 10... Loop-shaped three-dimensional gather , 11 Front end fixed portion 12 Rear end fixed portion 13 Front non-stretchable portion 14 Rear non-stretchable portion 15 Elastic stretchable member 20 First folded portion 21 Second folded portion Part 22... First sheet part 23... Second sheet part 24... Third sheet part 25... First adhesion part 26... Second adhesion part 27... Third adhesion part 28... Fourth adhesion part

Claims (6)

The inner side portions in the width direction are folded in the width direction on both sides in the longitudinal direction of the skin contact surface side, and a plurality of elastic members are arranged along the length direction and at intervals in the width direction in the folded portions. Thus, a sheet member forming a hollow loop-shaped three-dimensional gather protruding toward the wearer's skin is disposed in the longitudinal section including the region corresponding to the wearer's bodily fluid discharge part,
The elastic stretchable member is fixed to the sheet member at the front end and the rear end of the sheet member, respectively, and end fixing portions are formed in which the folded portion of the sheet member is fixed to the absorbent body side, A non-stretchable portion in which the loop-shaped three-dimensional gather is formed in a longitudinally intermediate portion of the sheet member, and the elastic stretchable member is fixed to the sheet member between the end fixing portion and the loop-shaped three-dimensional gather, respectively. is formed and
In the loop-shaped three-dimensional gathers, the elastic force effective length at which the elastic expansion/contraction member exerts expansion/contraction force is longer for the elastic expansion/contraction member arranged on the outside in the width direction than for the elastic expansion/contraction member arranged on the inside in the width direction. An absorbent article characterized by: 2. The absorbent according to claim 1, wherein at least the non-stretchable portion on the front side has a non-stretchable length, which is a length along the longitudinal direction of the absorbent article of the non-stretchable portion, longer on the inner side in the width direction than on the outer side in the width direction. sexual goods. 3. The absorbent article according to claim 1, wherein the central edge in the longitudinal direction of said end fixing portion is formed by a straight line substantially parallel to the width direction. The absorbent article according to any one of claims 1 and 2, wherein the edge of the end fixing portion on the center side in the longitudinal direction is inclined toward the outside in the width direction toward the center side in the longitudinal direction. In the loop-shaped three-dimensional gather, the front edge of the elastic expansion/contraction member arranged on the outer side in the width direction is positioned more forward than the one arranged on the inner side in the width direction, and the front edge of the elastic expansion/contraction member is positioned on the front side of the elastic expansion/contraction member. 5. Any one of claims 1 to 4, wherein the edges are arranged substantially parallel to the width direction, or the edges arranged on the outside in the width direction are positioned on the rear side of those arranged on the inside in the width direction. The absorbent article described. Wing-shaped flaps are formed on both sides to be fixed so as to involve the crotch portion of the underwear when worn, and on both sides behind this, the hips are fixed to the inner surface of the buttocks of the underwear when worn. A hold flap is formed,
Of the elastic stretchable members arranged in the loop-shaped three-dimensional gathers, the elastic stretchable member arranged on the innermost side in the width direction has a front end located forward of the front edge of the wing-shaped flap, and a rear end thereof. The elastic stretchable member, which is positioned rearward from the rear edge of the wing-shaped flap and is arranged on the outermost side in the width direction, has a rear end positioned forward from the maximum protrusion in the width direction of the hip hold flap. 5. The absorbent article according to any one of claims 1 to 4, located.

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