JP4023934B2 - Absorbent articles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent article such as a sanitary napkin or an incontinence pad that has a high fit and is difficult to leak.
[0002]
[Prior art and problems to be solved by the invention]
Absorbent articles such as sanitary napkins and incontinence pads comprising a liquid-permeable surface layer, a liquid-impermeable leak-proof layer, and a liquid-retaining absorbent layer are widely used. There is a problem of causing a side leak in which excrement leaks from the side edge portion.
[0003]
Therefore, in order to prevent side leakage, for example, in JP-A-8-215244, an absorbent article provided with cuffs made of elastic pieces such as synthetic resin films on both side edges of the absorbent article is also disclosed in In Japanese Patent No. 3-15511, it has been proposed to form both sides of the absorbent layer in a three-dimensional manner by an elastic shape retaining piece made of a highly rigid material such as a foamed material such as polyurethane or a nonwoven fabric.
However, in Japanese Patent Laid-Open No. 8-215244, the cuff may fall inward due to the body pressure of the wearer, and excrement may leak beyond the cuff. In Japanese Utility Model Publication No. 3-15511, the rigidity of the elastic shape retaining piece is low. It is still not sufficiently satisfied with the prevention of leakage and the feeling of wearing, for example, the absorber does not buffer against the body pressure of the wearer and the elastic shape piece may give the wearer an uncomfortable feeling.
[0004]
Accordingly, an object of the present invention is to provide an absorbent article having excellent leakage prevention performance and a good wearing feeling.
[0005]
[Means for Solving the Problems]
The present invention achieves the above object by an absorbent article in which an elastic wall is formed by a liquid-impermeable band-like stretchable sheet on both right and left sides in the longitudinal direction, and an absorbent layer is arranged on the inner side.
[0006]
The present invention relates to a substantially vertically long absorbent article comprising a liquid-impermeable leak-proof layer and a liquid-retaining absorbent layer disposed on the skin contact surface side of the leak-proof layer. On both the left and right sides in the longitudinal direction of the sheet having elastic walls formed in a convex shape toward the skin contact surface side by a liquid-impermeable band-shaped stretch sheet, the elastic walls being in the width direction of the absorbent article Provided with an absorbent article, wherein the absorbent article is divided into an outer part and an inner part, and the absorbent layer is disposed on the skin contact surface side of the inner part of the elastic wall and the widthwise central part of the absorbent article. Is.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
[0008]
As shown in FIGS. 1 and 2, the sanitary napkin 1 as an absorbent article of this embodiment includes a liquid-impermeable leak-proof layer 3 and a liquid disposed on the skin contact surface side from the leak-proof layer 3. The retaining layer 2 is provided with a substantially vertically long shape. The leak-proof layer 3 is formed of a leak-proof sheet 31, and the absorbent layer 2 has a liquid-retaining absorbent body 21 and a liquid-permeable property disposed so as to cover the skin contact surface side of the absorbent body 21. The top sheet 22. The surface sheet 22 forms a skin contact surface, the leak-proof sheet 31 forms a non-skin contact surface, and the surface sheet 22 and the leak-proof sheet 31 are bonded together at the peripheral edge of the sanitary napkin. The non-skin contact surface is provided with a slip prevention material 4 for attaching to the underwear.
In the present application, the longitudinal direction refers to a longitudinal direction of the absorbent article, and the width direction refers to a direction perpendicular to the longitudinal direction.
In addition, conventional materials can be used for the constituent materials such as the top sheet, the leak-proof sheet and the absorbent body of the present invention, and the production method as an absorbent article.
[0009]
In the sanitary napkin 1 of the present embodiment, a pair of belt-like stretchable sheets 5 are respectively disposed and fixed on both left and right sides in the longitudinal direction of the leak-proof sheet 31, and the skin contact is caused by the shrinkage of the stretchable sheet 5. A convex elastic wall 10 is formed on the contact surface side.
The elastic wall 10 is divided into an outer portion 10a and an inner portion 10b in the width direction by the vicinity of the top of the elastic wall.
The absorbent layer 2 is located on the skin contact surface side of the leak-proof sheet 31 and is disposed on the skin contact surface side of the width direction center portion 1a and the inner portion 10b of each elastic wall 10.
[0010]
More specifically, the elastic wall 10 extends in the longitudinal direction, the cross-sectional shape in the width direction is an arc shape convex toward the skin contact surface side, and the inner portion 10b extends along the longitudinal direction of the sanitary napkin 1. Thus, the absorption layer 2 is disposed until it extends to both ends.
[0011]
In the sanitary napkin 1 of the present embodiment, the top sheet 22 covers the absorber 21 and also covers an elastic wall, and the outer edges of the top sheet are fixed to both sides and both ends of the sanitary napkin 1, respectively.
The thickness of the absorbent body 21 is preferably 0.05 to 3 mm, and more preferably 0.2 to 2 mm, from the viewpoint of fit and solid shape retention. The width W of the central portion 1a in the width direction of the absorbent layer 2 is preferably 15 to 60 mm from the viewpoint of fit to the body.
[0012]
The elastic sheets 5 and 5 are provided so as to extend over both ends of the sanitary napkin 1 in the longitudinal direction, and are fixed to the skin contact surface side of the leak-proof sheet 31 in a state of being stretched in the longitudinal direction. Has been.
Specifically, the stretchable sheet 5 includes the outer edge 5b and the inner edge 5c, which are both side edges along the longitudinal direction and the width direction of the sanitary napkin 1, that is, the longitudinal direction of each stretchable sheet 5, and the width. Both ends 5a and 5a along the direction are bonded and fixed to the leak-proof sheet 31, respectively.
The contraction force at the side edges 5b and 5c of the stretchable sheet 5 is weaker than the contraction force of the entire stretchable sheet, and between the side edges of the stretchable sheet, that is, between the outer edge 5b and the inner edge 5c. The central part actively contracts in the longitudinal direction of the sanitary napkin. Then, due to the contraction of the stretchable sheet 5, elastic walls 10 having a three-dimensional form convex on the skin contact surface side are formed on both sides of the sanitary napkin 1. In the sanitary napkin 1 of the present embodiment, the entire sanitary napkin is curved in a concave shape on the skin contact surface in the longitudinal direction due to the contraction of the stretchable sheet 5.
[0013]
The height h of the elastic wall 10 from the absorbent layer 2 in the central portion 1a in the width direction is preferably 1 to 15 mm, and more preferably 2 to 10 mm, from the viewpoint of leakage prevention effect and wearing feeling. Moreover, as a curvature which curves concavely in the skin contact surface side in a longitudinal direction, the curvature radius r shown in FIG. 3 is 50-300 mm at the point of the fitting property to a body and the mounting property to underwear. It is preferable that it is 100-200 mm.
[0014]
In order to obtain a preferable height of the elastic wall and a curvature rate in the longitudinal direction of the sanitary napkin, the stretchable sheet 5 adjusts stretchable physical properties, fixing points and the like when adhesively fixed to the absorbent article.
[0015]
The stretchable physical property of the stretchable sheet 5 is that the stress when stretched 5 to 50% in the longitudinal direction of the absorbent article is 50 to 500 cN / width 25 mm in terms of moldability of the height of the elastic wall and fit properties. Is preferable, and 100 to 300 cN / width 25 mm is more preferable.
[0016]
In addition, the elastic sheet 5 is fixed in the width direction in order to obtain the above-described preferable convex shape and height h of the elastic wall, and the interval between 5b and 5c is preferably 3 to 30 mm, and more preferably 5 to 20 mm.
The stretchable sheet 5 and the leakproof sheet 31 are fixed, and the stretchable sheet 5 and the leakproof sheet 31 of the absorbent layer 2 are fixed using heat sealing, hot melt, ultrasonic waves, or the like.
[0017]
The stretchable sheet 5 is a belt-like sheet and is not particularly limited as long as it has stretchability. Specifically, as a sheet material, natural rubber, polyurethane, styrene-isoprene copolymer, styrene-butadiene copolymer, ethylene-α olefin copolymer such as a copolymer of ethyl acrylate and ethylene, etc. Examples of the material itself include a film such as a stretchable film, a nonwoven fabric, and a woven fabric, and a laminate of the film and the nonwoven fabric.
[0018]
In the case where the stretchable sheet is a laminate with a nonwoven fabric, it is preferably laminated with a thermoplastic nonwoven fabric made of polyethylene / polyester, polyethylene / polypropylene, polypropylene or the like in order to improve heat sealability.
As such a thermoplastic nonwoven fabric, it is preferable to use fibers crimped so that the nonwoven fabric itself has stretchability. When laminating non-stretchable non-woven fabrics, it may be made by stretching only the stretchable film in advance to a predetermined stretch rate and bonding it to the non-woven fabric by hot melt, heat sealing, etc., and the stretchable film gathers the non-woven fabric. .
[0019]
Moreover, in the sanitary napkin 1 of this embodiment, a pair of first grooves 14 and 14 along the longitudinal direction is formed on the skin contact surface of the absorbent layer 2 in the longitudinal center portion 1b inside the inner portion 10b of the elastic wall. And the 2nd groove | channels 15 and 15 are provided by embossing, heat welding, etc. In the first groove and the second groove, the topsheet 22 and the absorber 21 are bonded. The depth of the first groove and the second groove is preferably 0.1 to 5 mm, and preferably 0.1 to 5 mm in width.
[0020]
The sanitary napkin 1 of the present embodiment is excellent in preventing side leakage, since the elastic wall 10 extends in the longitudinal direction in a convex curved shape on both sides of the sanitary napkin to form a leak-proof wall.
In addition, the elastic wall 10 is formed by the stretchable sheet 5 and formed on both sides of the sanitary napkin, so that the body pressure of the wearer from the outside in the width direction is buffered, and the deformation recovery property is good. Since it is difficult to twist, an absorbent article excellent in leakage prevention can be provided. Furthermore, the elastic wall 10 is flexible and has an appropriate degree of deformation, and follows the movement of the body, so that the wearer does not feel uncomfortable and has a good wearing feeling.
[0021]
In the sanitary napkin 1 according to the present embodiment, the absorbent layer 2 is disposed up to the inner portion 10b of the elastic wall 10 and both sides of the sanitary napkin form an absorbent leak-proof wall. It will be excellent. In addition, since the absorption surface is always kept wide and the absorption layer 2 of the inner portion 10b has an appropriate degree of freedom, the absorption body does not fall inside and obstruct absorption, and the absorption surface is along the body. It is possible to prevent as much as possible a decrease in absorption power and absorption speed and leakage due to deviation or floating of the point of discharge from the body.
[0022]
Furthermore, in the sanitary napkin 1 of this embodiment, since the said surface sheet 22 is distribute | arranged so that the elastic wall 10 whole may be covered, the touch to a wearer is favorable.
Since the sanitary napkin 1 of the present embodiment has the first groove 14 and the second groove 15, it contributes to suppression of absorption and diffusion of bodily fluids and exhibits excellent leakage prevention properties. Moreover, since it has the 2nd groove | channel 15, the said absorption layer 2 can support more favorably along the inner side part 10b of the said elastic wall, and the sanitary napkin 1 fits well between a wearer's crotch. Is done.
[0023]
In addition, although preferable embodiment was described, it can be changed as follows.
As shown in FIGS. 4 and 5, the top sheet 22 covers the side edge of the absorbent body 2 and folds inward to prevent penetration of body fluid into the outer portion 10 a of the elastic wall 10. The outer portion 10a may not be covered. In this case, the stretchable sheet 5 is made of a thermoplastic non-woven fabric made of polyethylene / polyester, polyethylene / polypropylene, polypropylene, or the like in order to improve the touch of the portion that directly contacts the skin and to improve the heat sealability. Laminate materials may be used.
[0024]
Moreover, the fixing along the longitudinal direction of both side edge parts 5b and 5c of the elastic sheet 5 may be bonded over the entire length, or may be bonded only at the central part 1b in the longitudinal direction. Moreover, the fixing along the width direction of the elastic sheet 5 may be bonded at both end portions 5a or may be bonded at a position from the central portion 1b.
Further, the elastic sheet 5 may be further extended in the width direction, and an anti-slip material may be provided on the non-skin contact surface side to form an elastic wing for fixing underwear.
[0025]
【The invention's effect】
According to the absorbent article of the present invention, excellent leakage prevention and wearing feeling can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a sanitary napkin as a first embodiment of an absorbent article of the present invention.
2 is a cross-sectional view taken along the line II of FIG.
FIG. 3 is a schematic cross-sectional view taken along the line II-II showing the concave shape of the sanitary napkin 1 of FIG.
FIG. 4 is a perspective view showing a sanitary napkin as another embodiment of the absorbent article of the present invention.
5 is a cross-sectional view taken along the line II of FIG.
[Explanation of symbols]
1, 1 'sanitary napkin 1a width direction center part 1b longitudinal direction center part 2 absorption layer 21 absorber 22 surface sheet 3 leakage prevention layer 31 leakage prevention sheet 4 slip prevention material 5 elastic sheet 5a both ends 5b of an elastic sheet Elastic sheet outer edge 5c Elastic sheet inner edge 10 Elastic wall 10a Elastic wall outer part 10b Elastic wall inner part 14 First groove 15 Second groove

Claims (4)

In a substantially vertically long absorbent article comprising a liquid-impermeable leak-proof layer and a liquid-retaining absorbent layer disposed on the skin contact surface side from the leak-proof layer,
Longitudinally right and left side portions of the absorbent article has a liquid-impermeable formed by strip-shaped stretchable sheet and the skin contact surface side to form a convex shape elastic wall, elastic walls the absorbent It is divided into an outer part and an inner part with respect to the width direction of the article,
The absorbent article, wherein the absorbent layer is arranged on the skin contact surface side of the central part in the width direction of the absorbent article and the inner part of the elastic wall.   The absorbent article according to claim 1, wherein the absorbent article has a shape curved concavely toward the skin contact surface side in the longitudinal direction. The absorbent layer is composed of a liquid-retaining absorbent body and a liquid-permeable surface sheet covering the skin contact surface side of the absorbent body, and the skin contact of the outer part of the elastic wall made of the belt-shaped stretchable sheet. The absorbent article according to claim 1, wherein a surface is covered with the surface sheet extending on the outer side .   The absorbent article according to claim 1, wherein the absorbent layer has a pair of left and right grooves extending in the longitudinal direction inside the inner portion of the elastic wall.

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