WO2020162454A1

WO2020162454A1 - Absorbent article

Info

Publication number: WO2020162454A1
Application number: PCT/JP2020/004128
Authority: WO
Inventors: 幾哉渡辺
Original assignee: 大王製紙株式会社
Priority date: 2019-02-06
Filing date: 2020-02-04
Publication date: 2020-08-13
Also published as: JP7157676B2; TW202031220A; JP2020124425A

Abstract

[Problem] In this absorbent article equipped with three-dimensional gathers in a hollow and loop shape, the protrusion height of each of the three-dimensional gathers is increased so as to prevent leakage and reduce a sense of discomfort. [Solution] The present invention pertains to a sanitary napkin 1 which has formed at both longitudinal lateral sides on a skin-contacting surface side thereof hollow, loop-shaped three-dimensional gathers 10 that each protrude toward a wearer's skin side. The loop-shaped three-dimensional gathers 10 each have, inside the hollow space thereof, a pushing-up three-dimensional gather 11 that has a fixed end on the base end side of said loop-shaped three-dimensional gather 10 and that has a leading end forming a free end 12 standing up on the side facing the wearer's skin. A free-end elastic member 13 is provided, along the longitudinal direction, to the free end 12 of the pushing-up three-dimensional gather 11, and the loop-shaped three-dimensional gather 10 is configured to be pushed up from inside the hollow space by the free end 12 of the pushing-up three-dimensional gather 11.

Description

Absorbent article

The present invention mainly relates to absorbent articles such as sanitary napkins, vaginal discharge sheets, incontinence pads, toiletries, etc., and more specifically, hollow loops projecting to the skin side on both sides in the longitudinal direction on the skin contact surface side. Relates to an absorbent article having a three-dimensional gather.

Conventionally, as the absorbent article, a cotton-like pulp or the like is provided between a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet. It is known that an absorber is interposed.

Especially for night sanitary napkins, in order to prevent lateral leakage of bodily fluids such as menstrual blood flowing in the width direction and leaking from the side edges during wearing, the skin contact surface side longitudinally both sides, respectively. Many products having a three-dimensional gather projecting to the side are provided to the market.

As the three-dimensional gather, a gather-forming nonwoven fabric is folded in two or three and is joined to the absorbent body side at both longitudinal end portions of the absorbent article, so that the tip forms a free end portion at the longitudinal intermediate portion. There are standing wall-shaped three-dimensional gathers that stand up to the skin side in this way, and loop-shaped three-dimensional gathers that project toward the skin side so as to form a hollow loop shape (for example,

Patent Documents

1 and 2 below).

Japanese Patent No. 5123583 Japanese Patent No. 5119041

The standing wall-shaped three-dimensional gather has an advantage that the standing height on the skin side can be increased, but it has a drawback that it easily falls in the width direction and leakage of body fluid and a feeling of strangeness occur when worn in a collapsed state. It was

On the other hand, the loop-shaped three-dimensional gathers as described in

Patent Documents

1 and 2 are less likely to collapse in the width direction, but the protrusion height to the skin side is insufficient, and the loop shape with the skin surface when worn. There is a possibility that a gap will be formed between the three-dimensional gather and the body fluid may leak from this gap.

Further, in the loop-shaped three-dimensional gathers described in

Patent Documents

1 and 2, the sheet member forming the loop-shaped three-dimensional gather is pulled up to the wearer's skin side mainly by the contracting force of the thread-like elastic member arranged above the loop portion. A hollow loop portion is formed, but such a loop portion is formed only in a section of the wearer's crotch where the absorbent article is largely curved and deformed in the front-rear direction, and the front side Also, in the section on the rear side, the contracting force of the thread-like elastic member above the loop portion did not act so much, and the loop portion was difficult to be formed. Further, if the tension of the thread-shaped elastic member is increased in order to increase the protrusion height of the loop portion, the contact with the skin may be deteriorated, which may cause a feeling of strangeness.

Therefore, a main object of the present invention is to provide an absorbent article having a hollow loop-shaped three-dimensional gather, in which the protruding height of the three-dimensional gather is increased to prevent leakage and to reduce an uncomfortable feeling. It is in.

In order to solve the above-mentioned problems, as the present invention according to claim 1, an absorbent article in which hollow loop-shaped three-dimensional gathers projecting to the wearer's skin side are formed on both sides in the longitudinal direction on the skin contact surface side. At
In the hollow inside of the loop-shaped three-dimensional gather, there is provided a push-up three-dimensional gather that has a fixed end on the base end side of the loop-shaped three-dimensional gather and stands up on the wearer's skin side so that the tip forms a free end. The elastic member for free end is arranged along the longitudinal direction at the free end of the push-up three-dimensional gather, and the loop-shaped three-dimensional gather is formed from the hollow inside by the free end of the push-up three-dimensional gather. An absorbent article is provided which is characterized by being pushed up.

In the invention according to the above-mentioned claim 1, a lifting three-dimensional gather comprising a standing wall-shaped three-dimensional gather is provided inside the hollow of the loop-shaped three-dimensional gather, and the loop-shaped three-dimensional gather is hollow by the free end portion of this pushing up three-dimensional gather. Pushed up from inside. This makes it easier for the loop-shaped three-dimensional gathers to project to the skin side, improves the adhesion of the loop-shaped three-dimensional gathers to the skin surface, and prevents leakage of body fluid. Further, since the elastic member for the free end arranged at the free end of the three-dimensional gather for pushing up is in contact with the skin surface through the sheet member of the loop-shaped three-dimensional gather, the skin contact of the elastic member is soft. It will reduce the discomfort when wearing.

As the present invention according to claim 2, there is provided the absorbent article according to claim 1, wherein the push-up three-dimensional gather is formed by a sheet member continuous from a base end portion of the loop-shaped three-dimensional gather.

In the invention according to claim 2, since the push-up three-dimensional gather is formed by the sheet member continuous from the base end portion of the loop-shaped three-dimensional gather, the push-up three-dimensional gather is easily formed, and the loop-shaped three-dimensional gather is formed. Gathering tends to protrude to the skin side.

In the present invention according to claim 3, in the loop-shaped three-dimensional gather and the pushing-up three-dimensional gather, a sheet member in which elastic members are arranged at appropriate positions inside the double sheet along the longitudinal direction of the absorbent article is In a cross-sectional view in the width direction of the absorbent article, the first fold extends from the width direction outer side to the width direction inner side of the absorbent article and is folded back to the wearer's skin side at the width direction inner side position. And a second folded-back portion which is continuous with the first folded-back portion and extends outward in the width direction and which is folded back to the wearer's non-skin side at the outer side in the width direction. In a state of having a first seat portion, a second seat portion and a third seat portion in order from the non-skin side of the wearer,
A first joint 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, and the second sheet portion at a position near the second folded portion. A second joint portion that is joined to the first sheet portion over the entire length in the direction, and a third joint portion that joins both longitudinal end portions of the third sheet portion to the second sheet portion, respectively.
In the longitudinal section between the third joint portions provided at both ends in the longitudinal direction, at least the third sheet portion projects toward the wearer's skin side with the first joint portion and the second joint portion as base ends. The push-up three-dimensional gather, which forms the hollow loop-shaped three-dimensional gather and stands up on the wearer's skin side in the hollow inside of the loop-shaped three-dimensional gather with the second sheet portion as the base end. The absorbent article according to any one of

claims

1 and 2, which forms a sheet.

The invention according to claim 3 defines the folded state and the joined state of the sheet members for forming the loop-shaped three-dimensional gathers and the three-dimensional upward gathers. Specifically, the sheet member is folded in three in a predetermined form, and a joining portion is provided at an appropriate position of each layer, thereby forming the loop-shaped three-dimensional gather and the pushing-up three-dimensional gather in the middle portion in the longitudinal direction. There is.

As a fourth aspect of the present invention, the free end portion of the lifting three-dimensional gather is a portion in which the loop-shaped three-dimensional gather most protrudes to the wearer's skin side at least in a longitudinal section corresponding to the inseam of the wearer. An absorbent article according to any one of claims 1 to 3 is provided.

In the invention according to claim 4, a portion in which the free end portion of the push-up three-dimensional gather has the highest protrusion on the wearer's skin side at least in a longitudinal section corresponding to the inseam of the wearer. Since it is located at, the loop-shaped three-dimensional gathers easily project to the skin side by the push-up three-dimensional gathers.

The present invention according to claim 5 provides the absorbent article according to any one of claims 1 to 4, wherein an elastic member for a loop portion is arranged in a loop portion of the loop-shaped three-dimensional gather along a longitudinal direction. ..

In the invention according to claim 5, the loop-shaped three-dimensional gathers are easily projected to the skin side by disposing the elastic member for the loop portion along the longitudinal direction in the loop portion of the loop-shaped three-dimensional gather.

As the present invention according to claim 6, the absorbent member according to claim 5, wherein the elastic member for a loop part is not arranged on the inner side in the width direction of the absorbent article in the loop part of the loop-shaped three-dimensional gather. Articles are provided.

Among the elastic members for the loop part arranged in the loop part of the loop-shaped three-dimensional gather, the elastic members for the loop part arranged on the widthwise inner side and the widthwise outer side of the absorbent article are the loop-shaped three-dimensional gathers. Since a force for widening the hollow loop portion is generated together with the force for pulling up the skin to the skin side, the component of the force for widening the hollow loop portion has a function of lowering the protruding height of the loop-shaped three-dimensional gather toward the skin side. Therefore, in the invention according to claim 6, the elastic member for the loop portion is not arranged in this portion so that the protruding height of the absorbent article on the inner side in the width direction does not decrease.

According to a seventh aspect of the present invention, the loop-shaped three-dimensional gather is provided with a section in which an arrangement interval of the elastic members for the loop section adjacent to each other along the loop section is relatively narrower than other sections. An absorbent article according to item 5 is provided.

In the invention according to claim 7, the loop-shaped three-dimensional gather is provided with a section in which the arrangement intervals of the elastic members for the loop section which are adjacent to each other along the loop section are relatively narrower than other sections. The elastic members for the parts are likely to project to the skin side in a densely arranged section.

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

It is a partially broken development view of the sanitary napkin 1 according to the present invention. FIG. 2 is a view taken along the line II-II of FIG. FIG. 3 is a view taken along the line III-III of FIG. 1. It is an expanded sectional view which shows the width direction inner side part of the gather sheet 7 in a longitudinal direction intermediate part. It is an expanded sectional view which shows the width direction inner side part of the gather sheet|seat 7 in a longitudinal direction both ends. It is a top view of the sanitary napkin 1 which shows each joint part. FIG. 6 is a perspective view showing a joint portion of a widthwise inner side portion of a gather sheet 7. It is an expanded sectional view which shows the width direction inner side part of the gather sheet 7 in the longitudinal direction intermediate part which concerns on a modification. FIG. 2 is a cross-sectional view of the sanitary napkin 1 showing its standing state (a view taken along the line II-II in FIG. 1). It is an expanded sectional view which shows the width direction inner side part of the gather sheet 7 in the longitudinal direction intermediate part which concerns on a modification. FIG. 2 is a cross-sectional view of the sanitary napkin 1 showing its standing state (a view taken along the line II-II in FIG. 1).

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-impervious backsheet 2 made of a polyethylene sheet or the like, a menstrual blood or a vaginal discharge (hereinafter also collectively referred to as body fluid). ), a liquid-permeable surface sheet 3 for promptly permeating the sheet, an absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the

sheets

2 and 3, and a long side on both sides on the skin contact surface side. In a predetermined section in the longitudinal direction of the napkin including at least a region corresponding to the body fluid discharge part H of the wearer, while being provided over substantially the entire length in the direction, with the substantially side edge of the absorber 4 as a standing base end ( In the section corresponding to the crotch of the wearer), a pair of left and right three-dimensional gathers that project to the skin side, gather sheets 7 that form the BS, and the upper and lower ends of the absorber 4 around the absorber 4 are provided. At the edge portion, the outer edge portions of the liquid-impermeable back sheet 2 and the liquid-permeable top sheet 3 are joined by an adhesive such as hot melt or joining means such as heat sealing or ultrasonic sealing, and at both side edges thereof. The liquid-impervious backsheet 2 extending laterally from the absorber 4 and the gather sheet 7 are joined together by an adhesive such as hot melt or a joining means such as heat seal or ultrasonic seal, so that almost no body fluid is present. A pair of left and right wing-shaped flaps W, W respectively extending outward are formed at the absorbent body side position corresponding to the discharge portion H, and outwardly at the rear side portions of the rear side (buttock side). A pair of left and right rear flaps W _B , W _B extending is formed. In the illustrated example, in order to maintain the shape of the absorbent body 4 and improve the diffusibility, the absorbent body 4 is surrounded by the encapsulating sheet 5 made of crepe paper or non-woven fabric. You don't have to. 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. ..

Hereinafter, the structure of the sanitary napkin 1 will be described in more detail.
The liquid-impermeable backsheet 2 is made of a sheet material having at least water-blocking property such as polyethylene, but it is preferable to use a material having moisture permeability from the viewpoint of preventing stuffiness. This water-impermeable/moisture-permeable sheet material is obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching it in a uniaxial or biaxial direction A sheet is preferably used. On the non-skin side surface (outer surface) of the liquid impermeable back sheet 2, one or a plurality of adhesive layers (not shown) are formed along the longitudinal direction of the napkin, and the sanitary napkin 1 is attached to the body when worn. It is designed to be fixed to underwear. As the liquid-impervious backsheet 2, a polylaminated nonwoven fabric obtained by laminating a plastic film and a nonwoven fabric may be used.

Next, as the liquid-permeable surface sheet 3, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is preferably used. As the material fibers constituting the non-woven fabric, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. A non-woven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in flexibility and drapability, and the thermal bond method is excellent in bulkiness and high compression recovery. When a large number of through holes are formed in the liquid-permeable surface sheet 3, the body fluid is quickly absorbed, and the dry touch property 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 give the texture of a towel cloth. Further, in order to facilitate the embossing treatment, it is preferable to use an olefin fiber having a relatively low melting point such as polyethylene or polypropylene. Further, a core-sheath fiber having a high melting point fiber as a core and a low melting point fiber as a sheath, a side-by-side type fiber, or a split type composite fiber can also be preferably used.

The absorber 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-absorbent polymer is mixed in the pulp forming the absorber, for example, as granular powder. Examples of the pulp include chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, rayon, and those composed of artificial cellulose fibers such as acetate. The softwood pulp having a longer fiber length than hardwood pulp has a function and It is preferably used in terms of price. The basis weight of the absorbent body 4 is 300 to 750 g/m ² , and preferably 300 to 400 g/m ² .

Also, synthetic fibers may be mixed in the absorber 4. As the synthetic fiber, for example, a polyolefin-based material such as polyethylene or polypropylene, a polyester-based material such as polyethylene terephthalate or polybutylene terephthalate, a polyamide-based material such as nylon, or a copolymer thereof may be used. It may be a mixture. Further, a composite fiber such as a core-sheath type fiber having a core with a fiber having a high melting point and a sheath having a fiber having a low melting point, a side-by-side type fiber, and a split type fiber can be used. In the case of hydrophobic fibers, it is desirable to use surface-treated synthetic fibers with a hydrophilizing agent so that they have an affinity for body fluids.

On the skin contact surface side of the absorbent body 4, in the widthwise central portion, including a region corresponding to the body fluid discharge part H of the wearer, the napkin is elongated in the longitudinal direction and thickened toward the skin side. It is preferable to provide the middle height part 6 of the absorbent body. The domed section 6 is generally provided from the fluid discharge portion H of the wearer to cover the site over the start position of the buttocks grooves provided in the longitudinal section from the wing-shaped flaps W to the middle portion of the rear flap W _B There is. The middle-height portion 6 may be formed by fiber lamination integrated with the absorber 4, or may be laminated separately. If the thickness of the middle-high portion 6 is too thick, the rigidity of the absorbent body 4 increases and the adhesion to the body decreases, so it is preferable to set it to 3 to 20 mm, preferably 5 to 15 mm. When the absorbent body 4 is surrounded by the encapsulating sheet 5, the absorbent body 4 and the middle height portion 6 may be integrally encased as shown in FIG. 4 and the middle-high section 6 may be separately surrounded by a covering sheet and then laminated.

On the other hand, in the illustrated example, the width dimension of the liquid-permeable topsheet 3 is set to be slightly longer than the width dimension of the absorbent body 4 as shown in the cross-sectional views of FIGS. 2 and 3. It stops only by covering, and on the outer side than that, a gather sheet 7 different from the liquid permeable surface sheet 3, specifically, to prevent permeation of blood, stuff, etc., or to enhance the feel of the skin, etc. Depending on the purpose, a gather sheet 7 made of a non-woven fabric material that has been subjected to appropriate water repellent treatment or hydrophilic treatment is provided.

The gather sheet 7 may be made of a natural fiber, a synthetic fiber, a regenerated fiber, or the like and is formed by an appropriate processing method, but it is preferable to eliminate the stickiness and prevent stuffiness. Therefore, it is preferable to use a soft non-woven fabric having a reduced basis weight and breathability. In particular, a non-woven fabric having a softness that is soft to the touch even when it comes into contact with the skin surface in a state of being highly projected to the skin side due to the contracting force of the elastic member is preferable. Specifically, it is desirable to use a non-woven fabric produced by a spunbond method with a basis weight of 13 to 23 g/m ^2, and in order to reliably prevent the permeation of body fluids, silicone-based, paraffin-based, alkylchromic chloride. A water repellent non-woven fabric coated with a water repellent is preferably used.

As shown in FIG. 2 and FIG. 3, the gather sheet 7 is bonded by hot melt or the like over a range from a predetermined inner position to an outer edge of the liquid-impermeable backsheet 2 in an outer portion of the widthwise intermediate portion. It is adhered by an agent and a predetermined flap portion is formed at a predetermined position. This flap part forms a pair of left and right wing-shaped flaps W, W on both sides of a portion substantially corresponding to the body fluid discharge part H, and rear flaps W _B , W _B on the rear side parts on the rear side (buttock side). Forming W _B. The longitudinal section including the wing flap W corresponds to the crotch of the wearer. These wing-shaped flaps W, W and rear flaps W _B, the outer surface side each pressure-sensitive adhesive layer (the liquid-impermeable back sheet 2 side) of the W _B (not shown) is provided, when worn for shorts, the wings folded on the opposite side Jo flaps W, the W at fold line RL position of the base end portion, as well as fastened is wound around the crotch portion of the shorts, so as to fasten the rear flap W _B to the inner surface of shorts There is.

[Three-dimensional gather]
The three-dimensional gather BS has one or a plurality of filaments in which the inner portion in the width direction of the gather sheet 7 is folded substantially double and both ends or appropriate positions in the longitudinal direction are fixed inside the double sheet. The elastic stretchable member is arranged at a predetermined position along the longitudinal direction of the sanitary napkin 1, the double sheet is appropriately folded, and a predetermined portion is joined at the joining portion. As shown in FIG. 3, the widthwise inner side portion of the gather sheet 7 includes at least a body fluid discharge portion H by being bonded to the absorbent body 4 side in an appropriately folded state as shown in FIG. As shown in FIG. 2, a pair of left and right three-dimensional gathers BS, which project to the skin side, are formed in a predetermined section in the longitudinal direction of the napkin corresponding to the crotch of the wearer.

The three-dimensional gather BS has hollow loop-shaped three-dimensional gathers 10 projecting toward the wearer's skin side on both sides in the longitudinal direction on the skin contact surface side, and the hollow inside of the loop-shaped three-dimensional gathers 10 along the longitudinal direction. And has a fixed end on the proximal side of the loop-shaped three-dimensional gather 10 and a standing-up three-dimensional gather 11 that stands up on the wearer's skin side so that the tip forms a free end 12. There is. An elastic member 13 for a free end is arranged at the free end of the push-up solid gather 11 along the longitudinal direction. The loop-shaped solid gather 10 is pushed up from the hollow inside by the free end 12 of the push-up solid gather 11.

Since the loop-shaped three-dimensional gathers 10 are pushed up by the push-up three-dimensional gathers 11, the loop-shaped three-dimensional gathers 10 easily project to the skin side, the adhesion of the loop-shaped three-dimensional gathers 10 to the skin surface becomes good, and the body fluid Leakage can be prevented. Further, since the elastic member 13 for the free end arranged at the free end 12 of the three-dimensional gather 11 for pushing up is in contact with the skin surface through the sheet member of the loop-shaped three-dimensional gather 10, the skin of the elastic member is The hit is soft and you can reduce discomfort when wearing it. As described above, in addition to the structure in which the loop-shaped three-dimensional gather 10 is not easily collapsed, the loop-shaped three-dimensional gather 10 is pushed up to the wearer's skin side by the push-up three-dimensional gather 11 and protrudes high toward the skin side. Therefore, the loop-shaped three-dimensional gather 10 can be kept in close contact with the skin surface, and leakage of body fluid can be prevented.

As shown in FIG. 4, the loop-shaped three-dimensional gather 10 protrudes toward the wearer's skin side in a hollow loop shape having a substantially circular cross section, with the side edge of the absorber 4 as a base end. The base end portion of the loop-shaped three-dimensional gather 10 is joined to the absorber 4 side by two joining portions that are separated in the width direction. One or a plurality of, in the illustrated example, three loop member elastic members 14 are fixed to both ends or appropriate positions in the longitudinal direction of the loop portion projecting to the skin side from the joint portion of the base end portion. , 14... Are arranged in a stretched state.

As shown in FIG. 4, the push-up three-dimensional gather 11 is arranged inside the hollow of the loop-shaped three-dimensional gather 10 and has a fixed end (joint portion) on the base end side of the loop-shaped three-dimensional gather 10. Is a standing wall-shaped three-dimensional gather whose tip forms the free end 12.

The fixed end portion of the push-up three-dimensional gather 11 can be arranged at any position as long as it is inside the hollow space on the proximal end side of the loop-shaped three-dimensional gather 10. That is, as in the illustrated example, the loop-shaped three-dimensional gather 10 is hollow with the two joining portions (the first joining portion 25 and the second joining portion 26 described later) that are separated in the width direction of the sanitary napkin 1 as the base end. In the form of forming the loop shape, a fixed end portion may be provided at or near the widthwise inner or outer joint portion, or a fixed end portion may be provided at an intermediate portion of these joint portions. .. Preferably, from the viewpoint of simplifying the manufacture and the viewpoint that the upright direction of the push-up three-dimensional gathers 11 is directed inward, the joint portion (second joint portion 26) on the outer side in the width direction has a fixed end portion. Good.

The free end portion 12 of the push-up three-dimensional gather 11 is brought into contact with the inner surface of the loop-shaped three-dimensional gather 10 to assist the loop-shaped three-dimensional gather 10 from protruding from the inside toward the skin. The cross-sectional shape of the push-up three-dimensional gather 11 is formed in a substantially linear shape in the illustrated example, but is formed in a shape bent in one or a plurality at the intermediate portion such as a substantially V shape or a substantially Z shape. Good. Further, in the illustrated example, the free end elastic member 13 is arranged only on the free end 12 of the push-up three-dimensional gather 11, but one or a plurality of elastic members are arranged in the middle of the base end. Good.

The push-up three-dimensional gather 11 may be formed by a sheet member that is separate from the loop-shaped three-dimensional gather 10, but as shown in FIG. 4, a sheet that continues from the base end of the loop-shaped three-dimensional gather 10. It is preferably formed by a member. By forming a continuous sheet member from the loop-shaped three-dimensional gather 10, the pushing-up three-dimensional gather 11 can be easily provided inside the hollow of the loop-shaped three-dimensional gather 10.

The specific structures of the loop-shaped three-dimensional gathers 10 and the push-up three-dimensional gathers 11 will be described. The loop-shaped three-dimensional gathers 10 and the push-up three-dimensional gathers 11 have two widthwise inner side portions of the gather sheet 7. A sheet member in which elastic members (the elastic member 13 for the free end portion and the elastic member 14 for the loop portion...) Are 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 the cross-sectional view of the sanitary napkin 1 in the width direction, the sanitary napkin 1 extends from the width direction outer side to the width direction inner side and is width direction inner side. The 1st folding|returning part 20 folded back to the wearer's skin side at the side position, while being extended to the width direction outer side continuously to this 1st folding|returning part 20, a wearer is the width direction outer side position. And the second folded portion 21 folded back to the non-skin side, the first sheet portion 22, the second sheet portion 23, and the third sheet portion 24 are sequentially formed from the wearer's non-skin side. ing.

In addition, as shown in FIG. 6 and FIG. 7, at the position where the first seat portion 22 is slightly outward in the width direction from the first folded portion 20, the wearer's non-wear is extended over the entire length in the longitudinal direction. The first joining portion 25 for joining to the member (the liquid-permeable surface sheet 3) arranged on the skin side, and the second sheet portion 23 at the position near the second folding portion 21 over the entire length in the longitudinal direction. A second joining portion 26 that joins the first sheet portion 22 and a third joining portion 27 that joins both longitudinal end portions of the third sheet portion 24 to the second sheet portion 23 are provided. In addition, in the present embodiment example, the fourth joint portion 28 that joins the longitudinal end portions of the first sheet portion 22 to the liquid permeable surface sheet 3 at positions near the first folded portion 20 is provided. .. 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, the first joint portion 25 and the fourth joint portion are separated from each other by the extension line extending from the side edge of the first joint portion 25 to both ends in the longitudinal direction from the section where only the first joint portion 25 in the longitudinal direction intermediate portion exists. The part 28 can be distinguished. 6A 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. FIG. 6C is 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. 6C shows a joint portion between the third sheet portion 24 and the second sheet portion 23 ( It is a top view which shows the said 3rd junction part 27).

Then, in the longitudinal section between the third

joint portions

27, 27 provided at both ends in the longitudinal direction, at least the third sheet portion 24 is worn with the first joint portion 25 and the second joint portion 26 as the base ends. Forming a hollow loop-shaped three-dimensional gather 10 projecting toward the skin side of the wearer, and the second sheet portion 23 has the second joint portion 26 as a base end inside the hollow portion of the loop-shaped three-dimensional gather 10 on the skin side of the wearer. A three-dimensional gather 11 for pushing up which stands upright is formed. That is, the loop-shaped three-dimensional gather 10 protrudes to the skin side so as to form a hollow loop shape with the two first joining portions 25 and the second joining portions 26 that are separated in the width direction as the base ends, and The raising solid gather 10 is erected on the skin side with the second joint portion 26 forming the base end portion on one side (outer side in the width direction) of the loop-shaped solid gather 10 as the base end.

With the structure described above, the loop-shaped three-dimensional gathers 10 and the push-up three-dimensional gathers 11 can be continuously formed with one gather sheet 7. Further, in the three-dimensional gather according to the present embodiment example, the second seat portion extending toward the inner side in the width direction with the second joint portion 26 provided on the outer side in the width direction as the pushing up three-dimensional gather 11 as the base end. Since it is formed by 23, the free end portion 12 faces the inner side in the width direction in the state where the three-dimensional gather 11 for pushing up is erected on the skin side, and thus the inner side in the width direction to the outer side in the width direction. The loop-shaped three-dimensional gather 10 has a structure that does not easily fall outward in the width direction due to the resistance force of the pushing-up three-dimensional gather 11 against the pressure toward.

In the embodiment example shown in FIG. 5, FIG. 6(C) and FIG. 7, the third joining 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 at a position close to the first folded portion 20 that overlaps the free end elastic member 13, it may not be provided on the second folded portion 21 side.

As shown in FIG. 2, the free end 12 of the pushing-up three-dimensional gather 11 in the natural state in which the contracting force of the

elastic members

13 and 14 acts is at least in the longitudinal section corresponding to the inseam of the wearer. It is preferable that the loop-shaped three-dimensional gathers 10 are located at the highest protruding portion on the skin side of the wearer. In the longitudinal section corresponding to the crotch of the wearer, the sanitary napkin 1 is most greatly curved and deformed in the longitudinal direction, and the three-dimensional gather BS is pulled up to the skin side by the contracting force of the elastic member arranged along the longitudinal direction. It is the part that is. Here, since the free end 12 of the push-up three-dimensional gather 11 is arranged so that the position can be freely changed in the hollow inside of the loop-shaped three-dimensional gather 10, the hollow inside of the loop-shaped three-dimensional gather 10 is arranged. Of these, it is easy to move to the part that most protrudes to the skin side of the wearer, and by assisting the push-up three-dimensional gathers 11 to push up the loop-shaped three-dimensional gathers 10 to the skin side, The loop-shaped three-dimensional gather 10 further protrudes higher toward the skin side, and the state in which the loop-shaped three-dimensional gather 10 closely contacts the wearer's skin surface can be maintained. This promotes the effect of preventing leakage of body fluid.

From the viewpoint of exhibiting such an effect more remarkably, the extension ratio of the elastic member 13 for the free end portion arranged on the free end portion 12 of the three-dimensional gather 11 for pushing up is arranged on the loop portion of the three-dimensional gather 10 in the loop shape. It may be larger than the extension rate of the elastic member 14 for the loop portion. As a result, the pushing-up effect of the loop-shaped three-dimensional gather 10 by the push-up three-dimensional gather 11 can be further enhanced, and the loop-shaped three-dimensional gather 10 further projects to the skin side. Further, since the elastic member 14 for the loop portion arranged in the loop-shaped three-dimensional gather 10 directly contacts the skin surface, if the elongation rate is increased, the skin contact with the skin surface is deteriorated and the wearing feeling is deteriorated, but it is pushed up. Since the free end elastic member 13 arranged at the free end 12 of the three-dimensional gather 11 for abutment is in contact with the skin surface via the loop-shaped three-dimensional gather 10, even if the extension rate is increased, the feeling of wearing is greatly reduced. There is nothing to do. The expansion rate of the elastic member 13 for the free end is preferably 1 to 3 times, preferably 1.2 to 2 times the expansion rate of the elastic member 14 for the loop portion.

FIG. 8 is a cross-sectional view showing a folded state of a widthwise inner side portion of the gather sheet 7 according to the modified example, and FIG. 9 is a transverse cross-sectional view of the sanitary napkin 1 showing its standing state. In this modification, the elastic member 14 for the loop part arranged in the loop part of the loop-shaped three-dimensional gather 10 is not arranged on the inner side in the width direction of the sanitary napkin 1 among the loop parts of the loop-shaped three-dimensional gather 10. I am trying. Of the elastic members 14 for loop part arranged in the loop part of the loop-shaped three-dimensional gather 10, the elastic members 14 for loop part other than the elastic member 14 for loop part arranged in the widthwise central part of the loop-shaped three-dimensional gather 10. That is, the elastic members 14 for the loop portion, which are arranged on the widthwise inner side and the widthwise outer side of the sanitary napkin 1, respectively, widen the hollow loop portion together with the force of pulling the loop-shaped three-dimensional gather 10 to the skin side. Since a force in the direction also acts, the force component in the direction of expanding the hollow loop portion has a function of reducing the protruding height of the loop-shaped three-dimensional gather 10 toward the skin side. Therefore, as described above, by not disposing the elastic member 14 for the loop portion on the inner side in the width direction of the sanitary napkin 1 in the loop portion of the loop-shaped three-dimensional gather 10, the loop on the inner side in the width direction is formed. The protrusion height of the three-dimensional gather 10 is prevented from decreasing.

On the other hand, as another modified example, as shown in FIGS. 10 and 11, in the loop-shaped three-dimensional gather 10, the arrangement intervals of the elastic members 14 for loop portions adjacent to each other along the loop are set to be relatively larger than those in other sections. The narrowed section may be provided. By providing a section in which the arrangement interval of the loop member elastic members 14 is narrowed, this portion easily protrudes to the skin side, and the effect of preventing leakage of body fluid can be further improved. The section in which the arrangement interval of the elastic member 14 for the loop portion is narrowed may be provided in any part of the section along the loop of the loop portion, and as in the illustrated example, the inner side in the width direction of the sanitary napkin 1. It is preferable to provide it. As a result, a wall surface is formed on the inner side in the width direction of the loop-shaped three-dimensional gather 10 so as to stand substantially vertically toward the skin side, and body fluid flowing toward the outer side in the width direction is loop-shaped three-dimensional gather. It will be possible to surely block with 10.

DESCRIPTION OF SYMBOLS 1... Sanitary napkin, 2... Liquid-impermeable backsheet, 3... Liquid-permeable topsheet, 4... Absorber, 5... Encapsulation sheet, 6... Middle-high part, 7... Gather sheet, 10... Loop-shaped three-dimensional gather , 11... Three-dimensional gather for pushing up, 12... Free end portion, 13... Elastic member for free end, 14... Elastic member for loop portion, 20... First folded portion, 21... Second folded portion, 22... First Sheet portion, 23... Second sheet portion, 24... Third sheet portion, 25... First adhesive portion, 26... Second adhesive portion, 27... Third adhesive portion, 28... Fourth adhesive portion

Claims

In the absorbent article in which hollow loop-shaped three-dimensional gathers protruding toward the skin side of the wearer are formed on both sides in the longitudinal direction of the skin contact surface side,
Inside the hollow of the loop-shaped three-dimensional gather, there is provided a push-up three-dimensional gather that has a fixed end on the base end side of the loop-shaped three-dimensional gather and stands up on the wearer's skin side so that the tip forms a free end. The elastic member for free end is arranged along the longitudinal direction at the free end of the push-up three-dimensional gather, and the loop-shaped three-dimensional gather is formed from the hollow inside by the free end of the push-up three-dimensional gather. An absorbent article characterized by being pushed up.
The absorbent article according to claim 1, wherein the push-up three-dimensional gather is formed by a sheet member that is continuous from a base end portion of the loop-shaped three-dimensional gather.
The loop-shaped three-dimensional gather and push-up three-dimensional gather, the sheet member in which the elastic member is arranged along the longitudinal direction of the absorbent article at an appropriate position inside the double sheet, in the widthwise sectional view of the absorbent article, A first folded portion that extends from the width direction outer side to the width direction inner side of the absorbent article and is folded back to the wearer's skin side at the width direction inner side position, and the first folded portion The non-skin of the wearer is continuously extended to the outer side in the width direction and is folded in three by the second folded portion that is folded back to the non-skin side of the wearer at the outer side position in the width direction. While having a first seat portion, a second seat portion and a third seat portion in order from the side,
A first joint 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, and the second sheet portion at a position near the second folded portion. A second joint portion that is joined to the first sheet portion over the entire length in the direction, and a third joint portion that joins both longitudinal end portions of the third sheet portion to the second sheet portion, respectively.
In the longitudinal section between the third joint portions provided at both ends in the longitudinal direction, at least the third sheet portion projects toward the wearer's skin side with the first joint portion and the second joint portion as base ends. The push-up three-dimensional gather, which forms the hollow loop-shaped three-dimensional gather and stands up on the wearer's skin side in the hollow inside of the loop-shaped three-dimensional gather with the second sheet portion as the base end. The absorbent article according to claim 1, wherein the absorbent article is formed.
The free end portion of the push-up three-dimensional gather is located at a portion where the loop-shaped three-dimensional gather most protrudes toward the wearer's skin side at least in a longitudinal section corresponding to the crotch of the wearer. 3. The absorbent article according to any one of 3 above.
The absorbent article according to any one of claims 1 to 4, wherein an elastic member for a loop portion is arranged in a loop portion of the loop-shaped three-dimensional gather along the longitudinal direction.
The absorbent article according to claim 5, wherein the elastic member for the loop portion is not arranged on the inner side in the width direction of the absorbent article in the loop portion of the loop-shaped three-dimensional gather.
The absorbent article according to claim 5, wherein the loop-shaped three-dimensional gather is provided with a section in which an arrangement interval of the elastic members for the loop section adjacent to each other along the loop section is relatively narrower than other sections.