JP2003052744A - Absorptive article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a back leak prevention effect by making each of hip holding flap parts have an absorptive function in an absorptive article provided with hip holding flaps on both rear side parts. SOLUTION: In an absorptive article 1 which has three-dimensional gathers BS on both front sides while interposing an absorber 4 between a liquid permeable top sheet 3 and a liquid non-permeable back sheet 2, formed with hip holding flaps HF and HF on both the rear side parts from a side non-woven fabric 7 forming the 3D gathers BS and the liquid non-permeable back sheet 2, each of hip holding flap parts HF is equipped with a sheet-shaped absorptive member 11 interposed between the side non-woven fabric 7 and the liquid non- permeable back sheet 2, the side non-woven fabric 7 is water-repellant non- woven fabric having a water pressure proof test value based on JIS L1092 of 40 mm to 160 mm and in the sheet-shaped absorptive member 11, the Klem water absorption degree based on JIS P8141 is from 5 mm to 50 mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads for absorbing menstrual blood and vaginal discharge. At the same time, the present invention relates to an absorbent article having hip-holding flaps on both sides of a rear part, in which the hip-holding flap portion has an absorbing function to enhance the post-leakage prevention effect.

[0002]

2. Description of the Related Art Conventionally, as absorbent articles such as panty liners, sanitary napkins and incontinence pads, liquid impermeable back sheets such as polyethylene sheets or polyethylene sheet laminated nonwoven fabrics and nonwoven fabrics or liquid permeable plastic sheets etc. It is known that an absorbent body made of cotton-like pulp or the like is interposed between the liquid-permeable top sheet and the liquid-permeable top sheet.

In recent years, various products have been proposed as the absorbent article depending on the amount of body fluid and the wearing time.
For example, in a night sanitary napkin, in order to fix the underwear more completely and prevent back leakage,
In addition to the wing-shaped flaps provided on both sides in the middle of the napkin in the longitudinal direction, in order to hold the hip side completely, flaps extending to the sides on both sides of the rear part (hereinafter referred to as a hip-hold flap). ) Exists.

Specifically, as shown in FIGS. 6 and 7, the absorbent article (sanitary napkin) includes a liquid-impervious back sheet 52 made of a polyethylene sheet or the like,
A liquid-permeable top sheet 53 which allows menstrual blood and vaginal fluid to quickly pass therethrough, and an absorbent body 54 made of cotton-like pulp or synthetic pulp interposed between these sheets 52 and 53.
And a pair of left and right three-dimensional gathers BS provided on both sides of the surface, and around the absorbent body 54, the liquid-impermeable back sheet 52 is formed at the front and rear edges thereof. The outer edge of the liquid-permeable top sheet 53 is joined by an adhesive such as hot melt or an adhesive means such as heat seal, and both sides (side flaps) thereof.
Then, the liquid-impervious back sheet 52 extending laterally from the absorber 54 and the side nonwoven fabric 55 forming the three-dimensional gather BS are made of an adhesive such as hot melt or an adhesive means such as heat seal. The wing-shaped flaps W, W that are joined together by the liquid-impervious back sheet 52 and the side nonwoven fabric 55 to project laterally are formed by the laminated sheet portion, and the hip hold is provided in the rear side portion thereof. The structure is such that the flaps HF and HF are formed.

Adhesive layers 56, 57, ... Are provided on the outer surfaces of the wing-shaped flaps W, W and the hip-holding flaps HF, HF, so that the sanitary napkin 50 can be worn underwear. The napkin 50 is locally applied, and the wing-shaped flaps W, W protruding laterally are brought out from the underwear, and the folding lines RL, RL at the flap base end are provided.
And wrap it around the crotch part of the underwear while sticking it to the outer surface of the crotch part of the underwear (see FIG. 8).

[0006]

As described above, the flaps HF, HF for the hip hold have the side nonwoven fabric 5 as described above.
5 and a liquid-impermeable back sheet 52 are laminated to each other, and basically have a structure that does not have a function of absorbing menstrual blood or the like. The leak prevention effect was not sufficient when there was bodily fluid or the like oozing out through the top sheet 53.

Therefore, Japanese Patent Laid-Open No. 2000-189459 proposes an absorptive article in which the wings HF and wing absorbers are provided in the hip hold flaps HF.

Surely, if the wing absorber is provided, the absorption capacity of the hip-holding flaps HF and HF is dramatically increased, but as the top sheet for covering the wing-like absorber, A liquid permeable sheet such as a hydrophilic non-woven fabric must be used to impart liquid permeability. Therefore, in the example of the absorbent article in the same publication, after the wings for the hip hold flaps HF and HF of the liquid-impervious backsheet are arranged, the wing absorber is almost the same as the liquid-impermeable backsheet on the upper surface side. A hydrophilic non-woven fabric having a shape is laminated over the entire surface, and an absorption unit whose outer periphery is covered with a liquid-permeable non-woven fabric is arranged and fixed on the upper surface side.

On the other hand, in the case of the sanitary napkin for night use, as described above, the three-dimensional gather BS is often formed, and the side flap portion extends the side nonwoven fabric 55 to the outside in view of cost and the like. Often. In many cases, the side non-woven fabric 55 is water-repellent in terms of the function as a gather, and is substantially impermeable to body fluid. Therefore, when a wing absorbent is simply provided on the hip-hold flaps HF and HF while the absorbent article having such a structure is used as a basic structure, body fluid is absorbed into the wing absorbent due to the water repellency of the side nonwoven fabric. It does not reach the point and cannot give the absorption function.

Therefore, a main object of the present invention is to provide a side-extending sheet portion of a side nonwoven fabric having three-dimensional gathers on both surface side sides and forming the three-dimensional gathers and a liquid-impermeable back sheet. In the absorbent article in which the hip hold flaps are formed on both sides of the rear portion, in providing the absorbent sheet-like member on the hip hold flaps, in the hip hold flap portions,
By using a side non-woven fabric with a well-balanced liquid permeability and liquid impermeability, it is possible to gradually absorb body fluid such as menstrual blood in the hip hold flap while exhibiting a predetermined water repellency in the three-dimensional gather part. Thus, it is an object of the present invention to provide an absorbent article in which side leakage and post-leakage are simultaneously prevented.

[0011]

According to a first aspect of the present invention for solving the above-mentioned problems, an absorbent body is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet,
And having a three-dimensional gather on both sides of the surface side, and the laterally extending sheet portion of the side nonwoven fabric forming the three-dimensional gather, and the laterally extending sheet portion of the liquid-impermeable back sheet, the rear portion is In an absorbent article in which hip-holding flaps are formed on both sides, in the hip-holding flap portion, a laterally extending sheet portion of the side nonwoven fabric and a laterally extending sheet portion of the liquid-impermeable backsheet. With the sheet-shaped absorbing member interposed between and,
The side nonwoven fabric is a water repellent nonwoven fabric having a water pressure resistance test value (low water pressure test-hydrostatic pressure method) according to JIS L1092 of 40 mm to 160 mm, and the sheet-shaped absorbent member is JIS P8141.
An absorbent article is provided which has a Klemm water absorption of 5 mm to 50 mm.

The present invention according to claim 2 provides the absorbent article according to claim 1, wherein the side nonwoven fabric is an air-through nonwoven fabric.

The present invention according to claim 3 provides the absorbent article according to any one of claims 1 and 2, wherein the sheet-shaped absorbent member is a crepe paper made of pulp fiber.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a development view of a sanitary napkin 1 according to the present invention, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIG. 3 is a view taken along the line III-III of FIG.

The sanitary napkin 1 includes a liquid-impermeable back sheet 2 made of a polyethylene sheet or the like, and a liquid-permeable top sheet 3 that allows quick passage of menstrual blood and vaginal discharge.
And an absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between these sheets 2 and 3, and this absorbent body 4
Crepe paper 5 that surrounds the absorbent body 4 in order to maintain the shape and improve the diffusibility of the absorbent body 4 and a substantially side edge portion of the absorbent body 4 as a standing base end, and at least a predetermined direction in the front-back direction from the blood discharge port corresponding portion. The liquid-impervious back sheet 2 is mainly composed of a pair of left and right three-dimensional gathers BS, which are provided so as to project to the front side in the section, and around the absorber 4, at the front and rear edges thereof. The outer edge portions of the liquid-permeable top sheet 3 and the liquid-permeable top sheet 3 are joined together by an adhesive such as hot melt or an adhesive means such as heat seal, and the impermeable portions that extend laterally beyond the absorber 4 at both edge portions thereof. The liquid backsheet 2 and the laterally extending sheet portion of the side nonwoven fabric 7 forming the three-dimensional gather BS are joined by an adhesive such as hot melt or an adhesive means such as heat seal,
Wing-like flaps W, W projecting laterally are formed by the laminated sheet portion of the liquid-impermeable back sheet 2 and the side nonwoven fabric 7, and a hip-hold flap is provided at a portion located on the rear side thereof. HF, H
F is formed.

The structure of the sanitary napkin 1 will be described in more detail below.
A sheet material having at least water-blocking property such as polyethylene is used, but in recent years, a material having moisture permeability tends to be used 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 the sheet uniaxially or biaxially A sheet is preferably used. One or a plurality of adhesive layers (not shown) are formed on the non-use surface side (outer surface) of the liquid-impervious back sheet 2 so that the sanitary napkin 1 is fixed to the underwear when it is worn on the body. It has become.

Next, as the liquid-permeable top sheet 3, a perforated or non-perforated non-woven fabric, a porous plastic sheet or the like is preferably used. As the material fibers constituting the non-woven fabric, in addition to synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, polyamides, etc.,
Regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used, and a nonwoven fabric obtained by an appropriate processing method such as a spunlace method, a spunbond method, a thermal bond method, a meltblown method, or a needle punch method is used. be able to. Among these processing methods, the spunlace method is excellent in flexibility and drapability, and the thermal bond method is excellent in bulkiness and softness. When a large number of through holes are formed in the liquid permeable top sheet 3, menstrual blood, scents and the like (hereinafter collectively referred to as body fluids) are quickly absorbed, and the dry touch property is excellent. Will be things.

The absorbent body 4 may be any one capable of absorbing and retaining body fluid. Usually, fluffy pulp mixed with water-absorbing polymer powder is preferably used from the viewpoint of absorbing function and price. It The absorber 4 is preferably surrounded by a crepe paper 5 to maintain its shape. A plurality of embosses 6a to 6c are provided on the surface of the liquid-permeable top sheet 3 for holding the absorbent body, swelling the surface side tightly, and containing the absorbed body fluid.

On the other hand, in the illustrated example, the width dimension of the liquid permeable top sheet 3 is set to be slightly longer than the width of the absorber 4 as shown in the transverse sectional views of FIGS. Four
The three-dimensional gather BS is formed by using a side nonwoven fabric 7 different from the liquid permeable top sheet 3. The side non-woven fabric 7 has a water-repellent material itself or a silicone-based or paraffin-based
A non-woven fabric material that has been subjected to an appropriate water repellent treatment such as coating with an alkylchromic chloride-based water repellent is used.

As shown in FIGS. 2 and 3, the side nonwoven fabric 7 has an absorbent body 4 on the outer side of the widthwise middle portion.
The side non-woven fabric 7 and the liquid impermeable back sheet 2 are bonded to each other with an adhesive such as hot melt over a range from the inner position of the absorbent body slightly beyond the side edge of the absorber to the outer edge of the liquid impermeable back sheet 2. By the laminated sheet portion, a pair of left and right wing-shaped flaps W, W are formed at a side position of the absorber substantially corresponding to a body fluid discharge port, and flaps HF, HF for hip hold are formed at a rear side position thereof. . Each of the wing-shaped flaps W, W and the hip-holding flaps HF, HF is provided with an adhesive layer 10 on the outer surface side, and as shown in FIG.
W is turned back at the turnback line RL and wound around the crotch part of the shorts to be fastened.

On the other hand, the inner part of the side nonwoven fabric 7 is folded back in a substantially double manner, and inside the double sheet, a thread-like elasticity is fixed at the middle portion in the height direction at both ends or at appropriate positions in the longitudinal direction. The elastic member 8 is provided, and a plurality of elastic members are provided on the upper side of the thread-like elastic elastic member 8.
In the illustrated example, the two thread-like elastic stretchable members 9, 9 are arranged in a state where both ends or appropriate positions in the longitudinal direction are fixed. As shown in FIG. 3, at the front and rear ends, the double sheet portion is bonded to the absorbent body 4 side in a state where the double sheet portion is folded and laminated in a Z-shape in cross section, so that the thread-like elastic expansion / contraction member 8 is disposed. As bending points, three-dimensional gathers BS and BS that stand upright on the surface side are formed while forming pockets with an opening facing inward in a V-shaped cross section.

In the sanitary napkin 1, as shown in FIGS. 1 and 3, the flaps HF, HF for the hip hold, the laterally extending sheet portion of the side nonwoven fabric 7 and the liquid impermeable portion. A sheet-shaped absorbent member 11 is provided so as to be interposed between the sheet and the laterally extending sheet portion of the back sheet 2. As the sheet-shaped absorbing member 11, for example, one made of only pulp fibers or a mixture of pulp fibers and chemical fibers can be used, but crepe paper made of only pulp fibers is used in terms of cost and the like. Is desirable.

Further, the sheet-shaped absorbing member 11 receives a large bending stress or shearing stress from the buttocks, and at the same time, if the rigidity is too high, the skin feels uncomfortable and the wearability is impaired. Therefore, a material having appropriate hardness (deformation resistance) against pure bending and shearing and its recoverability should be used.

As one specific example of the above-mentioned deformation resistance and its recoverability, the deformation performance value for pure bending by a pure bending tester (manufactured by Kato Tech Co., Ltd.) is 2.94 mN · cm 2.
/ cm or less, preferably 1.96 mN · cm2 / cm or less,
Further, those having a deformation performance value against shearing by a tensile shear tester (manufactured by Kato Tech Co., Ltd.) of 80 N / m · deg or less, preferably 50 N / m · deg or less are suitably used. When the deformation performance value for pure bending exceeds 2.94 mN · cm2 / cm and / or the deformation performance value for shearing is 80
If it exceeds N / m · deg, it will feel stiff when worn and give a sense of discomfort.

The pure bending tester is a tester for simulating the softness-hardness that a human feels when bending an object into a curved shape, and can measure the bending hardness and the bending recovery property. It is a thing. The test sandwiches the test piece with a chuck, sensitivity 2 x 1 (force meter 20g / V), maximum bending curvature ± 2.5
Bend to make one round trip at cm ^-1 , and the bending curvature is 0.5 to 1.
The slope value (B value) in the range of 5 (cm ^-1 ) is used as an index value, and the larger the B value, the more rigid and non-deformable (see FIG. 4).

On the other hand, the tensile shear tester is a tester for simulating the softness / stiffness that a human feels when an object is displaced, and is capable of measuring the easiness of deviation and the recoverability against deviation. . For the test, hold the test piece with a chuck and continue to apply a tension of W = 10 gf / cm in the lengthwise direction, with a sensitivity of 2 × 5 (force meter 4 g / V) and a maximum angle of ± 2 deg. It is deformed in the shearing direction and the shearing angle is 0.2 to 0.
The inclination value (G value) in the range of 4 (degree) is used as an index value, and the smaller the G value, the higher the shear deformability (see FIG. 5).

On the other hand, the side nonwoven fabric 7 covering the surface side of the sheet-shaped absorbent member 11 is made of a water-repellent nonwoven fabric material in order to prevent body fluid such as menstrual blood and spillage from flowing out to the side. However, when the water repellency is high, the sheet-like absorbent member 11 cannot absorb the body fluid leaking to the outside of the three-dimensional gather BS at the hip-hold flaps HF and HF. .
Therefore, it is necessary to allow the passage of body fluid to some extent while having water repellency.

Therefore, the side non-woven fabric 7 in the sanitary napkin 1 has a water pressure resistance test value (low water pressure test-hydrostatic pressure method) according to JIS L1092 of 40 mm to 160 mm, preferably 50 to 70 mm. As the sheet-like absorbent member, a sheet having a Klemm water absorption of 5 mm to 50 mm, preferably 15 to 20 mm according to JIS P8141 is used.

The side nonwoven fabric 7 has a water pressure resistance test value of 40.
If it is less than mm, the leakproofness of the body fluid is poor and the body fluid cannot be blocked by the solid gather BS. When the water pressure resistance test value exceeds 160 mm, the liquid permeability is poor and body fluid cannot pass through the side nonwoven fabric 7, and the meaning of disposing the sheet-shaped absorbent member 11 is substantially lost. Non-woven fabrics having such physical property values, in other words, as a non-woven fabric having both liquid permeability and liquid impermeability, particularly an air-through nonwoven fabric having a large inter-fiber distance while being fused only at the points where the fibers contact each other. Most preferred. More specifically,
It is desirable to use an air-through non-woven fabric prepared with a basis weight of 18 to 30 g / m ² , and coated with a silicone-based, paraffin-based, or alkylchromic chloride-based water repellent to ensure the prevention of permeation of body fluids. A water repellent non-woven fabric is preferably used.

On the other hand, when the Klemm's water absorption of the sheet-shaped absorbent member 11 is less than 5 mm, the absorption speed is poor and the body fluid may revert. Further, when the Klemm's water absorption exceeds 50 mm, there is a concern that the side nonwoven fabric 7 and the liquid-impermeable back sheet 2 may seep out from the joint due to the high diffusivity.

By the way, when joining the side nonwoven fabric 7 and the liquid-impermeable back sheet 2 in the hip-hold flaps HF, HF, a method such as hot-melt adhesive, ultrasonic bonding, embossing bonding or the like is appropriately adopted. But,
From the viewpoint of adhesiveness and workability, a hot melt adhesive is preferable. Among these hot melt adhesives, hydrophilic hot melt adhesives are suitable. According to the hydrophilic hot melt adhesive, since the water contact angle (°) is small,
The body fluid does not have a polka-dot shape, and the body fluid easily passes through the side nonwoven fabric 7. In addition, it is desirable that the application method be applied in a spiral manner so as not to impede the passage of body fluid from the surface.

[0032]

As described above in detail, according to the present invention, a laterally extending sheet portion of a side nonwoven fabric having three-dimensional gathers on both surface side sides and forming the three-dimensional gathers,
In an absorbent article in which a hip hold flap is formed on both sides of a rear part with a liquid-impermeable back sheet,
In providing the absorbent sheet-like member on the hip-hold flap, by using a side nonwoven fabric having a well-balanced liquid-permeability and liquid-impermeability in the hip-hold flap, the three-dimensional gather portion has a predetermined repellent property. The water is exerted to block the passage of body fluid, while the flap portion for the hip hold can absorb body fluid such as menstrual blood, so that side leakage and post-leakage can be prevented simultaneously and in good balance.

[Brief description of drawings]

FIG. 1 is a development view of a sanitary napkin 1 according to the present invention.

FIG. 2 is a cross sectional view thereof (a view taken along the line II-II in FIG. 1).

FIG. 3 is a cross-sectional view thereof (a view taken along the line III-III in FIG. 1).

FIG. 4 is a graph showing an example of measurement results of a pure bending test.

FIG. 5 is a graph showing an example of measurement results of a tensile shear test.

FIG. 6 is a development view of a conventional sanitary napkin.

FIG. 7 is a cross-sectional view thereof (a view taken along the line VII-VII in FIG. 6).

FIG. 8 is a perspective view showing a mounted state of a napkin.

[Explanation of symbols]

1 ... Sanitary napkin, 2 ... Liquid-impermeable backsheet, 3 ...
Liquid-permeable top sheet, 4 ... Absorber, 5 ... Crepe paper, 7
... Side nonwoven fabric, 11 ... Sheet-shaped absorbent member, BS ... Three-dimensional gather, W ... Wing flap, HF ... Hip hold flap

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4C003 AA02 AA03 AA13 CA01 DA08                       EA03 HA05                 4C098 AA09 CC02 CC03 CC10 CC14                       CE06 DD03 DD06 DD10 DD12                       DD25 DD26 DD28

Claims (3)

[Claims] 1. A side in which an absorbent body is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and has three-dimensional gathers on both surface side portions, and the three-dimensional gathers are formed. An absorbent article in which a hip-holding flap is formed on both sides of a rear part of a side portion of the liquid-impermeable backsheet and a side-extending sheet portion of the liquid-impermeable backsheet, wherein the hip-holding flap is formed. In the portion, the side extending sheet portion of the side non-woven fabric, and a sheet-like absorbent member interposed between the side extending sheet portion of the liquid-impermeable back sheet, the side non-woven fabric is JIS L1092. The equivalent hydrostatic pressure test value (low water pressure test-hydrostatic pressure method) is 40 mm ~
It is a water repellent non-woven fabric of 160 mm, and the sheet-shaped absorbent member has a Klemm water absorption of 5 mm to 50 mm in accordance with JIS P8141.
Absorbent article characterized by being. 2. The absorbent article according to claim 1, wherein the side nonwoven fabric is an air-through nonwoven fabric. 3. The absorbent article according to claim 1, wherein the sheet-shaped absorbent member is a crepe paper made of pulp fiber.