JP7236289B2 - 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 liquid-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 gather, the nonwoven fabric for forming the gather is folded in two or three and joined to the absorbent body at both ends in the longitudinal direction of the absorbent article, so that the tip forms a free end in the intermediate part in the longitudinal direction. In this way, there are upright wall-like three-dimensional gathers that stand up on the skin side. 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 upright 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 of being able to increase the standing height toward the skin side. However, it tends to fall down in the width direction, and when worn in a fallen state, it has the drawback of causing leakage of bodily fluids and discomfort.

On the other hand, the loop-shaped three-dimensional gathers as described in Patent Documents 3 and 4 are less likely to collapse in the width direction, but the height of the protrusion toward the skin is insufficient, and the loop-shaped gathers with the skin surface when worn. A gap is likely to occur between the three-dimensional gathers, and body fluids may leak from this gap.

Therefore, the main object of the present invention is to provide an absorbent article having hollow loop-shaped three-dimensional gathers in which the projection height of the three-dimensional gathers is increased to prevent leakage and reduce discomfort. It is in.

In order to solve the above-mentioned problems, as the present invention according to claim 1, a plurality of elastic stretchable members are arranged along the longitudinal direction and at predetermined intervals in the width direction on both sides in the longitudinal direction on the side of the skin contact surface. In an absorbent article in which hollow loop-shaped three-dimensional gathers protruding toward the wearer's skin side are formed so as to form a loop portion by the provided sheet member,
The elastic expansion/contraction members comprise both side elastic expansion/contraction members arranged on both sides of the loop portion of the loop-shaped three-dimensional gather , and a plurality of middle elastic expansion/contraction members arranged between the both side elastic expansion/contraction members,
the separation distance between the adjacent intermediate elastic stretchable members is smaller than the separation distance between the both side elastic stretchable members and the intermediate elastic stretchable members adjacent thereto;
The length of the section in which the sheet member is stretchable by the intermediate elastic stretchable member is longer than the length of the section in which the sheet member is stretchable by the double-sided elastic stretchable member. Goods are provided.

In the invention according to claim 1, in the absorbent article in which the hollow loop-shaped three-dimensional gathers protruding toward the wearer's skin side are formed so as to form a loop portion , the loop-shaped three-dimensional gathers are arranged on the sheet member constituting the loop-shaped three-dimensional gathers. The elastic expansion/contraction members are composed of two-side elastic expansion/contraction members arranged on both sides of the loop portion, respectively , and a plurality of middle elastic expansion/contraction members arranged between the two-side elastic expansion/contraction members. The distance between the adjacent intermediate elastic stretchable members is made smaller than the distance between the two-side elastic stretchable members and the intermediate elastic stretchable members adjacent thereto, and the intermediate elastic stretchable member stretches and contracts the sheet member. The length of the stretched section is longer than the length of the stretched section of the sheet member by the double-sided elastic stretchable members. As a result, since the intermediate elastic stretchable members are arranged relatively densely in the intermediate portion along the loop portion and are arranged in a relatively long section in the longitudinal direction, the elastic force of the intermediate elastic stretchable member causes the loop to expand. The upper end of the three-dimensional gathers can be easily raised toward the skin, and the upper end of the raised loop portion can be brought into close contact with the skin surface to prevent leakage. In addition, since the three-dimensional gathers are hollow loop-shaped three-dimensional gathers, the gathers are less likely to fall down when worn, and a state of close contact with the skin surface can be maintained, and a sense of incongruity when worn can be reduced.

The present invention according to claim 2 provides the absorbent article according to claim 1, wherein 4 to 6 elastic stretchable members are arranged in each of the loop-shaped three-dimensional gathers on both sides.

In the invention according to claim 2, from the viewpoint of clearly exhibiting the effect of the elastic expansion/contraction members of each part, 4 to 6 elastic expansion/contraction members are arranged in each loop-shaped three-dimensional gather. These elastic stretchable members may be arranged one by one on each side of the loop portion as the double-sided elastic stretchable members, and two to four intermediate elastic stretchable members may be arranged between them. Two stretchable members may be arranged on each side of the loop portion, and two intermediate elastic stretchable members may be arranged between them.

As a third aspect of the present invention, there is provided the absorbent article according to any one of claims 1 and 2, wherein the extension rate of the middle elastic stretchable member is greater than the stretch rate of the both side elastic stretchable members.

In the invention according to claim 3, the elastic force of the intermediate elastic stretchable member causes the upper end of the loop-shaped three-dimensional gather to stand higher toward the skin. rate is greater.

According to a fourth aspect of the present invention, the front end of the section in which the stretchability is imparted to the sheet member by the intermediate elastic stretchable member is located from the front end of the section in which the stretchability is imparted to the sheet member by the both-side elastic stretchable members. The rear end of the section located on the front side where the sheet member is stretchable by the intermediate elastic stretchable member is located rearward of the rear end of the section where the sheet member is stretchable by the double elastic stretchable member. An absorbent article according to any one of claims 1 to 3 is provided.

In the invention according to claim 4, the section in which the stretchability is imparted to the sheet member by the intermediate elastic stretchable member is placed on the front side and the rear side of the section in which the stretchability is imparted to the sheet member by the both-side elastic stretchable members. , the loop-shaped three-dimensional gathers can be raised higher on the skin side due to the effect of suspending the sheet member by the intermediate elastic stretchable member.

As the present invention according to claim 5, the hollow interior of the loop-shaped three-dimensional gather has a fixed end on the base end side of the loop-shaped three-dimensional gather, and the tip is attached to the wearer's skin side so that the free end forms a free end. A three-dimensional push-up gather is provided, and a free end elastic member is arranged along the longitudinal direction at the free end of the three-dimensional push-up gather. The absorbent article according to any one of claims 1 to 4 is provided, wherein the loop-shaped three-dimensional gathers are pushed up from the hollow interior.

In the fifth aspect of the present invention, the hollow inside of the loop-shaped three-dimensional gather is provided with a three-dimensional gather for pushing up, which consists of a three-dimensional gather in the form of an upright wall, and the free end of the three-dimensional gather for pushing up makes the loop-shaped three-dimensional gather hollow. pushing up from within. This makes it easier for the loop-shaped three-dimensional gathers to protrude toward the skin, thereby improving the adhesion of the loop-shaped three-dimensional gathers to the skin surface and preventing leakage of bodily fluids. In addition, since the free end elastic member arranged at the free end of the lifting three-dimensional gather is in contact with the skin surface via the sheet member of the loop-shaped three-dimensional gather, the elastic member is soft against the skin. It becomes a thing, and the discomfort at the time of wearing can be reduced.

According to a sixth aspect of the present invention, there is provided the absorbent article according to the fifth aspect, wherein the three-dimensional push-up gathers are formed by a sheet member continuing from the base end portion of the loop-shaped three-dimensional gathers.

In the invention according to claim 6, since the three-dimensional push-up gathers are formed by a sheet member continuing from the base end of the loop-shaped three-dimensional gathers, the three-dimensional push-up gathers can be easily formed, and the loop-shaped three-dimensional gathers can be easily formed. Gathers tend to protrude toward the skin.

According to a seventh aspect of the present invention, the loop-shaped three-dimensional gathers and the three-dimensional push-up gathers are configured such that the sheet member extends from the outer side in the width direction of the absorbent article to the inner side in the width direction in a cross-sectional view of the absorbent article in the width direction. a first folded portion extending inward in the width direction and folded back toward the wearer's skin at a position on the inner side in the width direction; In addition, in a state of being folded in three by the second folded portion folded back to the non-skin side of the wearer at the outer side position in the width direction, the first sheet portion, the second sheet portion, and the second sheet portion in order from the non-skin side of the wearer Having a third seat portion,
A first joining portion that joins the first sheet portion to a member arranged on the non-skin side of the wearer over the entire length in the longitudinal direction; A second joint portion that joins the first sheet portion over the entire length in the direction, and a third joint portion that joins both ends of the third sheet portion in the longitudinal direction to the second sheet portion,
In the longitudinal section between the third joints provided at both ends in the longitudinal direction, at least the third sheet protrudes toward the wearer's skin with the first joint and the second joint as base ends. The lifting three-dimensional gathers form the hollow loop-shaped three-dimensional gathers, and the second sheet portion stands up on the wearer's skin side in the hollow interior of the loop-shaped three-dimensional gathers with the second joint portion as a base end. 7. An absorbent article according to any one of claims 5 and 6 is provided which forms a

The seventh aspect of the invention defines the folded state and the joined state of the sheet members for forming the loop-shaped three-dimensional gathers and the three-dimensional push-up gathers. Specifically, the sheet member is folded in three in a predetermined form, and joints are provided at appropriate positions on each layer to form the loop-shaped three-dimensional gathers and the three-dimensional push-up gathers at the intermediate portion in the longitudinal direction. there is

According to an eighth aspect of the present invention, the free end of the three-dimensional push-up gather is a portion where the loop-shaped three-dimensional gather protrudes highest toward the wearer's skin at least in the longitudinal section corresponding to the crotch of the wearer. The absorbent article according to any one of claims 5 to 7, which is located in is provided.

In the eighth aspect of the invention, the free end portion of the three-dimensional push-up gather is the portion where the loop-shaped three-dimensional gather protrudes highest toward the wearer's skin at least in the longitudinal section corresponding to the crotch of the wearer. , the loop-shaped three-dimensional gathers tend to protrude toward the skin side due to the three-dimensional push-up gathers.

As described in detail above, according to the present invention, the projection height of the loop-shaped three-dimensional gathers is increased, and leakage can be prevented, and discomfort can be reduced.

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. 4 is an enlarged cross-sectional view showing the widthwise inner side portion of the gather sheet 7 in the longitudinally intermediate portion with the elastic stretchable member stretched. 4 is an enlarged cross-sectional view showing widthwise inner side portions of the gather sheet 7 at both ends in the longitudinal direction. FIG. Fig. 2 is a plan view of the sanitary napkin 1 showing joints; 4 is a perspective view showing a joint portion of a widthwise inner side portion of the gather sheet 7. FIG.

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 ( A pair of left and right three-dimensional gathers BS projecting to the skin side in the section corresponding to the wearer's crotch part, and gather sheets 7, 7 forming the BS, and around the absorbent body 4, the front and rear ends thereof At the edges, the outer edges of the liquid-impermeable backsheet 2 and the liquid-permeable topsheet 3 are joined by a joining means such as hot-melt adhesive, heat sealing, or ultrasonic sealing. The liquid-impermeable back sheet 2 extending laterally from the absorber 4 and the gather sheet 7 are joined by a joining means such as hot-melt adhesive, heat sealing, ultrasonic sealing or the like. A pair of left and right wing-shaped flaps W, W extending outward are formed at the side portion of the absorbent body corresponding to the discharging portion H, and the flaps W extend outward from both sides of the rear portion on the rear side (buttock side). A pair of extending left and right rear flaps W _B and W _B are formed. 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

[Three-dimensional gather]
The three-dimensional gathers BS are formed by folding back the inner side portion in the width direction of the gathers sheet 7 almost double, and fixing both ends or appropriate positions in the longitudinal direction inside the double sheet for a plurality of loops. The elastic stretchable members 14, 14... are arranged along the longitudinal direction of the sanitary napkin 1 and at predetermined intervals in the width direction. It includes hollow loop-shaped three-dimensional gathers 10 formed so as to protrude toward the wearer's skin. As shown in FIG. 3, the inner side portion of the gather sheet 7 in the width direction includes at least the bodily fluid discharge portion H by adhering to the absorbent body 4 side in an appropriately folded state, as shown in FIG. As shown in FIG. 2, a pair of right and left three-dimensional gathers BS, BS projecting toward the wearer's skin are formed in a predetermined section in the napkin longitudinal direction corresponding to the crotch portion of the wearer.

The elastic members 14 for the loop part are composed of both elastic elastic members 15, 15 respectively arranged on both sides of the loop part, and a plurality of intermediate elastic elastic members 16 arranged between the elastic elastic members 15, 15. consists of

The two-side elastic stretchable members 15 are arranged on both sides of the loop-shaped three-dimensional gather 10, and are mainly on both sides of the loop portion at positions below (base end side) from the upper portion of the loop portion that comes into contact with the skin surface when worn. It is provided to expand outward and maintain the looped cross-section of the hollow portion. The both-sides elastic members 15 are arranged one at a predetermined interval in the width direction from the intermediate elastic member 16 or a plurality thereof at predetermined intervals in the width direction. In the illustrated example, the two-side elastic stretchable member 15 is arranged on each side of the loop portion.

On the other hand, the intermediate elastic stretchable member 16 is arranged on the upper part of the loop part of the loop-shaped three-dimensional gather 10, and pulls the upper part of the loop part toward the skin so that the upper part of the loop part can easily contact the skin surface when worn. It is provided in A plurality of intermediate elastic stretchable members 16 are arranged at predetermined intervals in the width direction.

FIG. 4 shows a state in which the elastic stretchable members provided in the three-dimensional gathers BS are stretched to prevent the gather sheet 7 from shrinking and deforming due to the contractile force of the elastic stretchable members, and the sheets are folded and stacked on the top sheet 3 side. It is a sectional view showing. In this sanitary napkin 1, as shown in FIG. It is smaller than the separation distances A and C. That is, they have the relationships of B<A and B<C. The separation distance B is preferably 2 to 9 mm, and the separation distances A and C are preferably 7 to 15 mm. The separation distances A and C do not need to have the same dimensions as long as they have dimensions within this range, and may be formed with different dimensions.

In addition, as shown in FIG. 1, the length D along the longitudinal direction of the napkin of the section where the gather sheet 7 is stretchable by the intermediate elastic stretchable member 16 is adjusted to the gather sheet 7 by the both-side elastic stretchable member 15. It is longer than the length E along the napkin longitudinal direction of the stretchable section. The section in which the gathered sheet 7 is stretchable by the elastic stretchable member refers to the section in the longitudinal direction of the sanitary napkin 1 in which the gathered sheet 7 is contracted by the contractile force of the elastic stretchable member in the natural state. There is a range where elasticity is lost due to the fact that both ends of the elastic stretchable member are continuously joined to the gathered sheet 7, and/or both ends of the elastic stretchable member are not continuously joined to the gathered sheet 7. , the middle section in the longitudinal direction of the sanitary napkin 1 excluding the range where the elastic force of the elastic stretchable member does not act on the gather sheet 7 .

With this configuration, the intermediate elastic members 16, 16 are arranged relatively densely and in a relatively long section at the upper end of the loop portion, so that the elastic force of the intermediate elastic member 16 is increased. acts intensively in a narrow range and acts over a long section in the longitudinal direction, so the gathered sheet 7 is lifted by the elastic force of the intermediate elastic elastic member 16, and the upper end of the loop-shaped three-dimensional gather 10 is on the skin side. Leakage can be prevented by making it easier to stand up high, and the high upright upper end comes in close contact with the skin surface. In addition, since the three-dimensional gathers BS are provided with the hollow loop-shaped three-dimensional gathers 10, the gathers are less likely to fall down when worn, the state of close contact with the skin surface can be maintained, and discomfort during wearing can be reduced.

4 to 6 elastic members 14 for the loop portion (elastic members provided in the loop portion including the elastic members 15 on both sides and the intermediate elastic member 16) are arranged on each of the loop-shaped three-dimensional gathers 10 on both sides. It is preferable to ensure that As a result, the action and effect of each elastic stretchable member can be clarified, and the standing height of the loop-shaped three-dimensional gathers 10 toward the skin can be increased more reliably. The arrangement of these elastic stretchable members is arbitrary, and one piece may be arranged on each side as the both-side elastic stretchable member 15, and two to four intermediate elastic stretchable members 16 may be arranged between them, Two elastic elastic members 15 on both sides may be arranged on each side, and two intermediate elastic elastic members 16 may be arranged between them. When two elastic members 15 are arranged on each side, the separation width is preferably 2 to 9 mm. Further, the number of the elastic members 15 on both sides does not have to be symmetrical, and different numbers may be arranged. In the illustrated example, a total of four loop portion elastic members 14 are arranged, one on each side as the both-side elastic member 15 and two middle elastic members 16 between them. .

From the viewpoint of making the upper end of the loop portion stand up on the skin side, it is preferable to set the elongation rate of the middle elastic stretchable member 16 larger than the stretch rate of the both side elastic stretchable members 15 . As a result, the contractile force of the intermediate elastic stretchable member 16 causes the upper end of the loop portion to rise higher toward the skin. It is preferable that the stretch rate of the middle elastic stretchable member 16 is 150 to 200%, and the stretch rate of the double elastic stretchable member 15 is 100 to 150%. The elongation rate is the elongation rate when the natural length is taken as 100%.

When the length of the section in which the gather sheet 7 is given elasticity by the intermediate elastic stretchable member 16 is relatively lengthened, as shown in FIG. The front end of the stretched section is positioned forward of the front end of the stretched section of the gathered sheet 7 by the both-side elastic stretchable members 15, and the intermediate elastic stretchable member 16 stretches the gathered sheet 7. It is preferable that the rear end of the section to which the stretchability is imparted is located on the rear side of the rear end of the section to which the gather sheet 7 is stretchable by the elastic members 15 on both sides. That is, the section in which the gathered sheet 7 is stretched by the intermediate elastic stretchable member 16 extends forward and rearward from the section in which the gathers sheet 7 is stretched by the both-side elastic stretchable members 15 . . As a result, the loop-shaped three-dimensional gathers 10 can be erected higher on the skin side by the hanging effect of the gathers sheet 7 by the intermediate elastic stretchable member 16 extending long in the front-rear direction at the upper end.

In addition, when relatively lengthening the length of the section in which the stretchability is imparted to the gathered sheet 7 by the intermediate elastic stretchable member 16, as shown in FIG. It is preferable to lengthen the front side and rear side of the section to which the is given by substantially the same length. As a result, the effect of hanging the gathered sheet 7 by the intermediate elastic stretchable member 16 is substantially uniform in the front and back, and the standing height toward the skin side can be increased from the front side to the back side. On the other hand, when it is desired to raise the front side higher and gradually lower the standing height as it goes to the rear side, the extension amount of the section where the gather sheet 7 is given elasticity by the intermediate elastic stretchable member 16 is set at the front side. It can be made larger and smaller at the rear.

The structure of the three-dimensional gathers BS will be described in more detail. It is preferable to construct a three-dimensional push-up gather 11 which has a fixed end on the base end side of 10 and stands up on the wearer's skin side so that the tip forms a free end portion 12 . A free-end elastic member 13 is arranged along the longitudinal direction at the free end of the three-dimensional push-up gathers 11 . The loop-shaped three-dimensional gathers 10 are pushed up from the hollow interior by the free ends 12 of the three-dimensional push-up gathers 11 .

By pushing up the loop-shaped three-dimensional gathers 10 by the three-dimensional push-up gathers 11, the loop-shaped three-dimensional gathers 10 tend to protrude higher on the skin side, and the adhesion of the loop-shaped three-dimensional gathers 10 to the skin surface becomes better. Leakage of bodily fluids can be prevented more reliably. In addition, since the free-end elastic member 13 arranged at the free end 12 of the three-dimensional push-up gather 11 is in contact with the skin surface via the sheet member of the loop-shaped three-dimensional gather 10, the skin of the elastic member is reduced. The contact becomes soft, and the discomfort at the time of wearing can be reduced. In this way, in addition to the structure in which the loop-shaped three-dimensional gathers 10 are inherently difficult to fall down, the loop-shaped three-dimensional gathers 10 are pushed up toward the wearer's skin by the push-up three-dimensional gathers 11 and protrude highly toward the skin. Therefore, the loop-shaped three-dimensional gathers 10 can be kept in close contact with the skin surface, and leakage of bodily fluids can be prevented.

As shown in FIG. 4 , the loop-shaped three-dimensional gathers 10 protrude toward the wearer's skin in a hollow loop shape having a vertically elongated, substantially dome-shaped cross-section, with a substantially side edge of the absorbent body 4 serving as a base end. ing. The proximal end of the loop-shaped three-dimensional gathers 10 is preferably joined to the absorbent body 4 side by two joints spaced apart in the width direction. As described above, the loop portion protruding toward the skin side from the joint portion of the base end is provided with a plurality of loop portion elastics, four in the illustrated example, in a state in which both ends or appropriate positions in the longitudinal direction are fixed. Members 14, 14 . . . are arranged in a stretched state.

As shown in FIG. 4, the three-dimensional push-up gathers 11 are arranged in the hollow interior of the three-dimensional loop gathers 10, and have a fixed end (joint) on the base end side of the three-dimensional loop gathers 10. , an upright wall-shaped three-dimensional gather having a free end 12 at its tip.

The fixed end portion of the three-dimensional push-up gathers 11 can be arranged at any position in the hollow inside of the loop-shaped three-dimensional gathers 10 on the base end side. That is, as shown in the illustrated example, the loop-shaped three-dimensional gather 10 has two joint portions (a first joint portion 25 and a second joint portion 26 to be described later) that are separated in the width direction of the sanitary napkin 1 as base ends. In the form of forming a loop shape, it may have a fixed end portion at or near the joints on the inner side or the outer side in the width direction, or may have a fixed end portion at an intermediate portion between these joints. . Preferably, from the viewpoint of simplifying the manufacturing process and making the upright direction of the three-dimensional push-up gathers 11 face inward, it is preferable to have a fixed end portion at the joint portion (second joint portion 26) on the outside in the width direction. good.

The free end 12 of the lifting three-dimensional gathers 11 abuts against the inner surface of the loop-shaped three-dimensional gathers 10, thereby assisting the loop-shaped three-dimensional gathers 10 to protrude toward the skin from the inside. The cross-sectional shape of the three-dimensional push-up gathers 11 is formed in a substantially linear shape in the illustrated example, but it may be formed in a shape such as a substantially V-shape or a substantially Z-shape, which is bent in one or more at the intermediate portion. good too. In the illustrated example, the free-end elastic member 13 is arranged only at the free end 12 of the three-dimensional push-up gather 11. good too.

The three-dimensional push-up gathers 11 may be formed by a sheet member separate from the loop-shaped three-dimensional gathers 10, but as shown in FIG. It is preferably formed by a member. By forming the sheet member continuously from the loop-shaped three-dimensional gathers 10, the three-dimensional gathers 11 for pushing up can be easily provided in the hollow interior of the loop-shaped three-dimensional gathers 10. - 特許庁

The specific structure of the loop-shaped three-dimensional gathers 10 and the three-dimensional push-up gathers 11 will be described. A sheet member having elastic members (the elastic member 13 for the free end portion and the elastic member 14 for the loop portion, etc.) arranged along the longitudinal direction of the sanitary napkin 1 at an appropriate position inside the double-folded sheet. As shown in FIGS. 4 and 5 , in cross-sectional views of the sanitary napkin 1 in the width direction, it extends from the outer side in the width direction of the sanitary napkin 1 to the inner side in the width direction and the inner side in the width direction. A first folded portion 20 folded back toward the wearer's skin side at the lateral position, and a first folded portion 20 extending outward in the width direction continuously from the first folded portion 20 and positioned at the outer side position in the width direction of the wearer. A first sheet portion 22, a second sheet portion 23 and a third sheet portion 24 are formed in order from the wearer's non-skin side in a state of being folded in three by the second folded portion 21 folded back to the non-skin side of the ing.

As shown in FIGS. 6 and 7, at a position where the first sheet portion 22 is slightly outward in the width direction from the first folded portion 20, the entire length in the longitudinal direction is covered by the wearer's comfort. The first joint portion 25 joined to the member (liquid-permeable surface sheet 3) arranged on the skin side, and the second sheet portion 23 are joined at a position near the second folded portion 21 over the entire length in the longitudinal direction. A second joint portion 26 that joins the first 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 are provided. 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. In addition, FIG. 6(A) is a plan view showing a joint portion (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. The hollow loop-shaped three-dimensional gathers 10 projecting toward the wearer's skin are formed, and the second sheet portion 23 extends toward the wearer's skin in the hollow interior of the loop-shaped three-dimensional gathers 10 with the second joint portion 26 as the base end. A three-dimensional gather 11 for pushing up 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 two first joint portions 25 and second joint portions 26 separated in the width direction as base ends. The lifting three-dimensional gathers 10 stand up on the skin side with a second joint portion 26 forming a base end on one side (outer side in the width direction) of the loop-shaped three-dimensional gathers 10 as a base end.

With the above structure, the loop-shaped three-dimensional gathers 10 and the three-dimensional push-up gathers 11 can be continuously formed with one gather sheet 7 . In addition, the three-dimensional gathers according to the present embodiment are second sheet portions that extend inward in the width direction from the second joint portion 26 in which the three-dimensional push-up gathers 11 are provided on the outer side in the width direction as a base end. 23, the free end 12 faces inward in the width direction with the three-dimensional push-up gathers 11 standing on the skin side. Due to the resistance of the internal push-up solid gathers 11, the loop-shaped solid gathers 10 are unlikely to fall outward in the width direction.

In the embodiments shown in FIGS. 5, 6C, and 7, the third joint portion 27 joins the third sheet portion 24 and the second sheet portion 23 over substantially the entire width. As long as it is provided at least near the first folded portion 20 overlapping the free end elastic member 13, it may not be provided on the second folded portion 21 side.

The third joint portion 27 is provided from the longitudinal end portion of the sanitary napkin 1 to the end portion of the section in which the gather sheet 7 is given stretchability by the intermediate elastic stretchable member 16, and both side portions thereof It is provided so as to extend to the end of the section where the gather sheet 7 is provided with elasticity by the elastic member 15 .

By providing the third joint portion 27, the loop-shaped three-dimensional gathers 10 do not protrude toward the skin, and the gathered sheet 7 is laminated on the surface side of the topsheet 3 in a folded state as shown in FIG. However, as shown in FIG. 6(C), it is desirable that the third joints 27 are provided only at both ends of the sanitary napkin 1 in the longitudinal direction and not provided in the intermediate portion.

Further, the fourth joint portion 28 is provided from the longitudinal end of the sanitary napkin 1 to the end of the section where the gather sheet 7 is stretchable by the intermediate elastic stretchable member 16 .

As shown in FIG. 2, the free end portion 12 of the three-dimensional push-up gather 11 in the natural state where the contractile force of the elastic members 13 and 14 acts is at least in the longitudinal section corresponding to the crotch of the wearer. It is preferable that the loop-shaped three-dimensional gathers 10 are positioned at a portion that protrudes most toward the wearer's skin. In the longitudinal section corresponding to the crotch portion of the wearer, the sanitary napkin 1 undergoes the greatest bending deformation in the longitudinal direction, and the three-dimensional gathers BS are pulled up to the skin side by the contractile force of the elastic members arranged along the longitudinal direction. It is the part that can be Here, since the free end 12 of the three-dimensional push-up gather 11 is arranged so as to be able to freely change its position in the hollow interior of the loop-shaped three-dimensional gather 10, Among them, it is easy to move to the part that protrudes most toward the skin side of the wearer. The loop-shaped three-dimensional gathers 10 protrude further toward the skin, so that the wearer's skin can be maintained in close contact with the wearer's skin. This promotes the effect of preventing leakage of bodily fluids.

From the viewpoint of making such an effect even more remarkable, the elongation rate of the free end elastic member 13 arranged at the free end 12 of the three-dimensional push-up gather 11 is arranged at the loop portion of the loop-shaped three-dimensional gather 10. The elongation rate of the elastic member 14 for the loop portion may be larger than that of the elastic member 14 for the loop portion. As a result, the effect of pushing up the loop-shaped three-dimensional gathers 10 by the three-dimensional push-up gathers 11 can be further enhanced, so that the loop-shaped three-dimensional gathers 10 protrude further toward the skin. In addition, since the loop elastic members 14 arranged in the loop-shaped three-dimensional gathers 10 are in direct contact with the skin surface, if the elongation rate is increased, the contact with the skin surface is deteriorated and the feeling of wearing is reduced. The free-end elastic member 13 arranged at the free end 12 of the three-dimensional gathers 11 is in contact with the skin surface via the loop-shaped three-dimensional gathers 10. Therefore, even if the elongation rate is increased, the feeling of wearing is greatly reduced. I have nothing to do. The elongation rate of the free end elastic member 13 is preferably 1 to 3 times, preferably 1.2 to 2 times, the elongation rate of the loop elastic member 14 .

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... Three-dimensional gathers for pushing up 12... Free end 13... Elastic member for free end 14... Elastic member for loop part 15... Both sides elastic stretchable member 16... Intermediate elastic stretchable member 20... First Folded part 21... Second folded 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 (8)

A plurality of elastic stretchable members are arranged along the longitudinal direction and at predetermined intervals in the width direction on both sides in the longitudinal direction of the wearer's skin on the skin contact side so as to form a loop portion. In an absorbent article in which a hollow loop-shaped three-dimensional gather protruding to the side is formed,
The elastic expansion/contraction members comprise both side elastic expansion/contraction members arranged on both sides of the loop portion of the loop-shaped three-dimensional gather , and a plurality of middle elastic expansion/contraction members arranged between the both side elastic expansion/contraction members,
the separation distance between the adjacent intermediate elastic stretchable members is smaller than the separation distance between the both side elastic stretchable members and the intermediate elastic stretchable members adjacent thereto;
The length of the section in which the sheet member is stretchable by the intermediate elastic stretchable member is longer than the length of the section in which the sheet member is stretchable by the double-sided elastic stretchable member. Goods. 2. The absorbent article according to claim 1, wherein 4 to 6 elastic stretchable members are arranged in each of the loop-shaped three-dimensional gathers on both sides. 3. The absorbent article according to claim 1, wherein the stretch rate of said middle elastic stretchable member is greater than the stretch rate of said both side elastic stretchable members. The front end of the section where the sheet member is stretchable by the intermediate elastic stretchable member is located forward of the front end of the section where the sheet member is stretchable by the both-side elastic stretchable member, and Claims 1 to 4, wherein the rear end of the section in which the sheet member is stretchable by the member is positioned rearwardly of the rear end of the section in which the sheet member is stretchable by the double-sided elastic stretchable member. 3. The absorbent article according to any one of 3. In the hollow interior of the loop-shaped three-dimensional gathers, there is provided a three-dimensional gather for pushing up, which has a fixed end on the base end side of the loop-shaped three-dimensional gathers and a free end portion at the front end, which stands on the wearer's skin side. A free end elastic member is arranged along the longitudinal direction at the free end of the three-dimensional push-up gather, and the free end of the three-dimensional push-up gather pushes the loop-shaped three-dimensional gather from the hollow interior. The absorbent article according to any one of claims 1 to 4, which is pushed up. 6. The absorbent article according to claim 5, wherein said push-up three-dimensional gathers are formed by a sheet member continuing from the base end portion of said loop-shaped three-dimensional gathers. In the loop-shaped three-dimensional gathers and the three-dimensional push-up gathers, the sheet member extends from the outer side in the width direction of the absorbent article to the inner side in the width direction in a cross-sectional view of the absorbent article, a first folded portion folded back toward the wearer's skin side at the widthwise inner side position; It has a first sheet portion, a second sheet portion, and a third sheet portion in order from the non-skin side of the wearer in a state of being folded in three by the second folded portion folded back on the non-skin side of the wearer, and
A first joining portion that joins the first sheet portion to a member arranged on the non-skin side of the wearer over the entire length in the longitudinal direction; A second joint portion that joins the first sheet portion over the entire length in the direction, and a third joint portion that joins both ends of the third sheet portion in the longitudinal direction to the second sheet portion,
In the longitudinal section between the third joints provided at both ends in the longitudinal direction, at least the third sheet protrudes toward the wearer's skin with the first joint and the second joint as base ends. The lifting three-dimensional gathers form the hollow loop-shaped three-dimensional gathers, and the second sheet portion stands up on the wearer's skin side in the hollow interior of the loop-shaped three-dimensional gathers with the second joint portion as a base end. 7. The absorbent article according to any one of claims 5 and 6, forming a The free end of the three-dimensional push-up gather is positioned at a portion where the loop-shaped three-dimensional gather protrudes most toward the wearer's skin at least in the longitudinal section corresponding to the crotch of the wearer. 7. The absorbent article according to any one of 7.

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