JPH06121810A - Absorbable article - Google Patents

Abstract

PURPOSE:To obtain an absorbable article which allows the prevention of spillage of mensual blood or the like by arranging a three-dimensional gathering body with facility of mounting and production and posing no problem even in wearing form to make the three-dimensional gathering forming body form a boat-shaped three-dimensional gathering in use. CONSTITUTION:A napkin 1 for menses is so arranged to be a three-dimensional gathering forming body 5 that a yarn material 7 adapted to shrink after the absorption of a liquid while being stretching is integrated with a sheet in the longitudinal and width-wise directions of a gathering forming sheet 6 and one side end 6A along the length of the sheet 6 is fixed on a surface material 2 while the other side thereof is made as free end 6B. A pair of the three- dimensional gathering forming bodies 5 which are so arranged to allow the erecting of the free end 6A from the surface of the surface material 2 because of the shrinking and stretching properties of the yarn material 7 after the absorption of the liquid is provided on the surface material 2 separately along both side parts in the longitudinal direction of the absorbent 4. This enables the three-dimensional gathering forming bodies 5 to form a boat in shape in use thereby preventing the spillage of mensual blood or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article such as a sanitary napkin, and more specifically, it comprises a liquid-permeable surface material, a back surface material, and an absorber provided therebetween. The present invention relates to an absorbent article provided with three-dimensional gathers for preventing lateral leakage on both sides of the surface material.

[0002]

2. Description of the Related Art Absorbent articles such as sanitary napkins and incontinence pads are provided in the center with an absorber for absorbing and retaining body fluids such as urine and menstrual blood excreted from the body. It has a flexible liquid-permeable surface material arranged on the contact side and a liquid-impermeable back material arranged on the opposite side in contact with the body. By the way, the outer shape and structure of the absorbent article are important factors for exerting a feeling of comfort and body fluid absorption, and various proposals of the absorbent article relating to these have been made. For example, in the sanitary napkin described in JP-A-60-193461, an elastic member is provided on the side edge of the sanitary napkin so that the central portion of the napkin has a shape similar to a cup.
Further, in the sanitary napkin described in Japanese Patent Laid-Open No. 58-67258, a standing wall formed by extending the back surface material is formed at the upper side edge of the absorbent layer, that is, the side portion of the surface material. And prevents the lateral leakage of menstrual blood. Further, the applicant of the present application has disclosed a sanitary napkin in Japanese Patent Publication No. 60-54411, in which a thread material that contracts and stretches after absorbing liquid is provided in the surface layer so that the surface material has irregularities after absorbing body fluid. We propose to improve comfort.

[0003]

However, in the conventional sanitary napkin and the like, since the shape of the ship is initially made by the elastic member and the standing wall, it is difficult to fix it to the underwear such as shorts when wearing. there were. Further, the use of the elastic member has been complicated in manufacturing. Further, it is difficult to individually package the product, and even if individually packaged, there is a possibility that the hull shape may not be maintained due to its compactness.
This makes it inconvenient to carry. In addition, a sanitary napkin having a surface material with irregularities could not prevent lateral leakage of menstrual blood even if the comfort was improved. Therefore, an object of the present invention is to provide a three-dimensional gather forming body which is easy to install and easy to manufacture and has no problem in the individual packaging form, and the three-dimensional gather forming body is used to form a boat-shaped three-dimensional gather when used. An object of the present invention is to provide an absorbent article which is formed to sufficiently prevent side leakage such as menstrual blood.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides an absorbent article comprising a liquid-permeable front material, a back material, and an absorber provided therebetween, which shrinks and stretches after absorbing the liquid. The yarn material to be exerted is integrally arranged with the sheet in the longitudinal direction and the width direction of the gather forming sheet, one end along the longitudinal direction of the sheet is fixed to the surface material, and the other end is a free end. And a pair of three-dimensional gather forming bodies arranged so that the free end can stand up from the surface material surface due to contraction and stretchability of the thread material after absorbing liquid. The above object is achieved by providing an absorbent article characterized by being provided on the surface material along both sides in the longitudinal direction thereof. The term "three-dimensional gather forming body" as used herein refers to a three-dimensional gather functioning only after liquid absorption.

[0005]

In the absorbent article described above, the three-dimensional gather-forming body does not form a boat shape before wearing, and it is easy to individually package and easily fixed to underwear such as shorts. Moreover, there is no need to handle elastic members and the like, and there is no complication in manufacturing.
On the other hand, after the absorbent article absorbs body fluid after wearing, the free end of the three-dimensional gather forming body stands up from the surface material surface due to the contraction in the longitudinal direction and the contraction in the width direction of the thread material to form a three-dimensional gather. A simple ship shape is formed on the mounting surface.
Therefore, there is no lateral leakage of body fluid such as menstrual blood, and discomfort due to body fluid or the like is reduced.

[0006]

The absorbent article according to the present invention will be described in detail below with reference to the drawings. 1 (a) is a plan view of an absorbent article (sanitary napkin) according to the present invention, FIG. 1 (b) is a cross-sectional view taken along the longitudinal direction of the sanitary napkin, and FIG. 1 (c) is a sanitary napkin. It is sectional drawing along the width direction. 2A is a sectional view taken along the longitudinal direction of the sanitary napkin after absorption of body fluid in FIG. 1, and FIG. 2B is a sectional view taken along the width direction of the sanitary napkin after absorption of body fluid of FIG. is there. FIG. 3 is a cross-sectional view of a thread material attachment portion used in the sanitary napkin of FIG. 4 (a) and 4 (b) are sectional views showing another embodiment of the thread material attaching portion of the sanitary napkin according to the present invention, and FIGS. 5 (a) and 5 (b) are related to the present invention. It is a top view showing another mode of a thread material attaching position of a sanitary napkin. As shown in FIG. 1, the absorbent article (sanitary napkin 1) according to the present embodiment is composed of a liquid-permeable surface material 2, a back surface material 3, and an absorber 4 provided therebetween. The same as known absorbent articles. Therefore, in the sanitary napkin 1 according to the present embodiment, the thread material 7 that contracts and exhibits elasticity after absorbing the liquid is arranged integrally with the gather forming sheet 6 in the longitudinal direction and the width direction thereof. One end 6A along the longitudinal direction of the sheet 6 is fixed to the surface material 2 and the other end is a free end 6.
A pair of three-dimensional gathered body 5 which is B and is arranged such that the free end 6B can stand up from the surface 2 of the surface due to contraction and stretchability of the thread 7 after absorbing liquid. The gather forming body 5 is provided on the surface material 2 along both sides in the longitudinal direction of the absorber 4.

To explain the present invention in more detail, as shown in FIG. 1, both side portions 2 of the surface material 2 of the sanitary napkin 1 are shown.
A three-dimensional gather forming body 5 is attached to each of A and 2B. The three-dimensional gather forming body 5 is composed of a liquid-impermeable band-like gather forming sheet 6 and a thread material 7, and one side end 6A of the gather forming sheet 6 is attached along each side portion of the surface material 2. . Gather forming sheet 6
The other end is a free end 6B, and the free end 6B can stand up apart from the surface 2 as shown in FIG. Therefore, the three-dimensional gather forming body 5 is not standing up when the liquid is not absorbed as shown in FIG.

The thread material 7 is the free end 6 of the gather forming sheet 6.
It is provided along B (longitudinal direction) and obliquely from the free end 6B side to the mounting end 6A side (width direction), and the end portion 7A of the thread material 7 is formed on the surface material 2 together with the gather forming sheet 6. It is fixed. The thread material 7 is contracted by liquid absorption and has elasticity, and as such a thread material, the caboxymethylation (hereinafter referred to as CM) proposed by the applicant of the present application in Japanese Patent Publication No. 60-54411. There may be mentioned a twisted yarn of cellulose. That is, it is important that the shrinkage rate of the thread material 7 is 10% or more, and it is particularly desirable that the shrinkage rate is 20 to 40%.
Such characteristics are caused by the CM degree and twist coefficient of the thread material, and by satisfying these conditions, the thread material used in the present invention is provided.

For example, the CM-modified cellulose yarn material used in the present invention may be a single twisted yarn or a plurality of twisted yarns, or may be a cross-linked CM-modified cellulose yarn. It is desirable that the CM-ized cellulose yarn has a degree of CM (DS) of at least 0.15 or more and a twist coefficient of at least 3.0. When the degree of CM (DS) and the twisting coefficient are below the above ranges, sufficient shrinkability and shrinkage force cannot be obtained. Examples of the CM-modified cellulose yarn material used in the present invention include yarns obtained by converting cellulose yarns such as cotton and polynosic rayon into CM. Examples of the cross-linking agent for the cross-linked CM cellulose yarn include glyoxal, epichlorohydrin, ethylene glycol and glycidyl ether. Further, the CM-modified cellulose thread material used in the present invention has the above-mentioned C
A plurality of CM cellulose single yarns having a degree of M may be twisted together, or a CM cellulose single yarn may be twisted with another non-water-absorptive shrinkable yarn such as cotton, rayon yarn or synthetic fiber. In this case, it is preferable that the twist coefficient is 3.0 or more and the mixing amount of the other non-water-absorptive shrinkable yarn does not exceed 50% by weight in order not to reduce the shrinkage force of the yarn material.

As shown in FIG. 3, the gather forming sheet 6 of the three-dimensional gather forming body 5 is composed of a liquid permeable sheet portion 6a and a liquid impermeable sheet portion 6b, and encloses the thread material 7 at the free end 6B. It is held and folded. In the present embodiment, the liquid-permeable sheet portion 6a is provided on the skin contact side (outside), but the thread material 7 may also absorb the wet-back liquid of the body fluid once absorbed from the surface material 2. Therefore, the liquid-permeable sheet portion 6a may be provided on the surface material side (inside).

The surface material 2 may be any known material as long as it is a liquid-permeable sheet, and examples thereof include woven cloth, non-woven cloth, and porous sheet, and the material thereof is pulp,
Examples include rayon, polyester, polyethylene, polypropylene and the like. The backing material 3 may be a publicly known one as long as it is a liquid impermeable sheet, but especially a moisture permeable liquid impermeable sheet obtained by adding a filler or the like to a thermoplastic resin and stretching, or a material having a feel similar to underwear For example, a strong water-repellent non-woven fabric or a composite material of a film and a woven fabric can be used. The liquid impermeable sheet portion 6b of the gather forming sheet 6 may be the same as the back material 3. The absorbent body 4 is not particularly limited as long as it is excellent in absorbing and retaining body fluid, and the thickness and shape are appropriately selected according to the purpose, but in the sanitary napkin 1, the absorbent body 4 has The thickness is in the range of 1 to 10 mm. Examples of the material of the absorbent body 4 include defibrated pulp, cellulose fiber, thermoplastic resin, and the like, and a high-molecular water-absorbing polymer known per se can be used together therewith.

The sanitary napkin 1 has a total stiffness of 1 g · cm to 50 g · cm, and the thread material 7 after absorbing the liquid.
It is important that the stress at 50% elongation of the is within the range of 5g to 150g, and preferably the total stiffness is 3g · c.
m to 20 g · cm, particularly 5 g · cm to 10 g · cm, and the preferable stress is 20 g to 50 g. When the stiffness of the sanitary napkin 1 and the expansion / contraction rate of the thread material 7 are within the above ranges, a preferable boat shape is formed when body fluid is absorbed. If the stiffness of the sanitary napkin 1 is less than the above range, sufficient shape retention of the napkin cannot be obtained, and if it exceeds the above range, the hull shape after liquid absorption is not sufficiently formed. If the expansion / contraction rate of the thread material 7 is less than the above range, a sufficient hull form is not formed, and if it exceeds the above range, a preferable hull form cannot be obtained.
In addition, as a measuring device for stiffness, a Taber stiffness tester (manufactured by Kumagai Riki Kogyo Co., Ltd.) was used, and a measuring method was to cut a 38 mm × 70 mm sample piece from the center of the sanitary napkin, and in an environment of 23 ° C. and 50%. After adjusting the humidity for 24 hours, attach the sample to the measuring device so as not to compress it.
The average of 0 measurements is used. Other conditions are TA
Measured according to the requirements of PPI T489-os70.
A universal tensile tester (Orientec Co., Ltd.) is used as the stress measuring device, and the measuring method is to attach 100 mm of the thread material to the tester and measure the stress when it is stretched to 150 mm.

The sanitary napkin 1 constructed as described above
When body fluid such as menstrual blood permeates the surface material 2 and is absorbed by the absorber 4, some body fluid permeates the liquid-permeable sheet portion 6a of the gather forming sheet 6 and is absorbed by the thread material 7. And thread material 7
Is contracted and stretchable. Therefore, as shown in FIG. 2, the three-dimensional gather forming body 5 is formed by contraction of the thread material 7 in the width direction.
Stands up, and the three-dimensional gather 5'because of contraction in the longitudinal direction.
Are formed, and the sanitary napkin 1 becomes a boat shape. Therefore, since the sanitary napkin 1 is not in the form of a ship from the beginning, it can be easily fixed to shorts or the like when worn, and can be easily packaged and carried without any complication in manufacturing. When absorbed, a three-dimensional gather 5'is formed to sufficiently prevent side leakage and the like. Although the liquid-permeable sheet portion 6a is provided on the skin contact side (outside), if the liquid-permeable sheet portion 6a is provided on the surface material side (inner side), it is temporarily absorbed from the surface material 2. Wet-back fluid of the collected body fluid is thread material 7
Is absorbed into the skin and exerts the above-mentioned effects.

In the above embodiment, the thread material is attached as shown in FIG. 3, but the present invention is not limited to this. That is, FIGS. 4A and 4B are cross-sectional views showing another embodiment of the thread material attaching portion of the sanitary napkin according to the present invention. The thread material 7 shown in FIG. It is adhered to the surface of the permeable sheet 6. Also in this case, the same operation and effect as described above can be obtained regardless of whether the attachment surface of the thread material 7 is on the skin contact side or the surface material side. Further, as shown in FIG. 4 (b), only a part of the gather forming sheet 6 that encloses the thread material 7 is covered with the liquid permeable sheet 6.
Alternatively, the liquid impermeable sheet 6b may be replaced by a, and in this case, further operational effects can be obtained.

Further, in the above embodiment, as shown in FIG. 1, the thread member 7 is attached along the longitudinal direction along the free end of the gather forming sheet 6 and along the inclined width direction. It is not necessary to follow the attachment position of the thread material of FIG. 1 as long as it is attached in the direction and the width direction. That is,
5 (a) and 5 (b) are plan views showing another embodiment of the thread material mounting position of the sanitary napkin according to the present invention.
In FIG. 5A, the thread material 7 is attached to the gather forming sheet 6 in a substantially T shape, and in FIG. 5B, the thread material 7 is the gather forming sheet 6.
Is attached in a substantially U shape. Even in such a configuration, when the three-dimensional gather forming body 5 absorbs the body fluid, the three-dimensional gather forming body 5 ′ becomes the three-dimensional gather 5 ′, and the sanitary napkin becomes a boat shape, and the same effect as the above is obtained. Although the above example is the sanitary napkin 1, it can be used for other absorbent articles. For example, it can be used as an incontinence pad or a disposable diaper in some cases.

[0016]

The absorbent article according to the present invention has a three-dimensional gathered body which is easy to put on and manufactured, and has no problem in the form of individual packaging. It is possible to sufficiently prevent lateral leakage such as menstrual blood by forming a boat-shaped three-dimensional gather.

[Brief description of drawings]

1A is a plan view of an absorbent article (sanitary napkin) according to the present invention, FIG. 1B is a cross-sectional view taken along the longitudinal direction of the sanitary napkin, and FIG. 1C is a width direction of the sanitary napkin. It is sectional drawing along.

2A is a sectional view taken along the longitudinal direction of the sanitary napkin after absorption of body fluid in FIG. 1, and FIG. 2B is a sectional view taken along the width direction of the sanitary napkin after absorption of body fluid of FIG. is there.

FIG. 3 is a cross-sectional view of a thread material attachment portion used in the sanitary napkin of FIG.

4 (a) and 4 (b) are cross-sectional views showing another embodiment of the thread material attaching portion of the sanitary napkin according to the present invention.

5 (a) and 5 (b) are plan views showing another embodiment of the thread material mounting position of the sanitary napkin according to the present invention.

[Explanation of symbols]

 1 Sanitary napkin 2 Surface material 3 Back material 4 Absorber 5 Three-dimensional gather forming body 5'Three-dimensional gather 6 Gather forming sheet 6a Liquid permeable sheet 6b Liquid impermeable sheet 7 Thread material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location 2119-3B A41B 13/02 F

Claims (2)

[Claims] 1. An absorbent article comprising a liquid-permeable surface material, a back surface material, and an absorber provided therebetween, wherein a thread material that contracts and exhibits elasticity after absorbing the liquid is a gather-forming sheet. A three-dimensional gather forming body that is integrally arranged with the sheet in the longitudinal direction and the width direction of the sheet, one end of the sheet along the longitudinal direction is fixed to the surface material, and the other end is a free end. , And a pair of three-dimensional gather forming bodies arranged so that the free end can rise from the surface material surface due to contraction and stretchability of the thread material after absorbing liquid, respectively on both sides in the longitudinal direction of the absorbent body. An absorbent article, characterized by being provided along the surface material. 2. The absorbent article is a sanitary napkin, and the sanitary napkin has a stiffness of 1 g · cm to 50 g ·
The absorbent article according to claim 1, wherein the stress at 50% elongation of the thread material after absorbing the liquid is in the range of 5 g to 150 g in the range of cm.