JP4146603B2 - Sanitary napkin - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent article such as a sanitary napkin, a panty liner, a cage sheet, and an incontinence pad for absorbing menstrual blood, cages, and the like.
[0002]
[Prior art]
Conventionally, as absorbent articles such as panty liners, sanitary napkins, cage sheets, incontinence pads, liquid-impervious back sheets such as polyethylene sheets or polyethylene sheet-laminated non-woven fabrics, and nonwoven fabrics or liquid-permeable plastic sheets, etc. 2. Description of the Related Art An absorbent body made of cotton-like pulp or the like is interposed between a liquid-permeable surface sheet.
[0003]
In such an absorbent article, many improvements have been made in order to reliably prevent practical functions, that is, leakage of body fluids, while improving the wearability and the touch to the skin. For example, in the absorbent article 50 shown in FIG. 4, in order to prevent the side edge portion of the relatively rigid absorbent body 51 from hitting the crotch portion and giving a feeling of sticking, etc., the central portion of the absorbent body 51 The side of the skin contact surface is provided with hydrophobic side non-woven fabrics 52 along the longitudinal direction of the absorbent body, and the body fluid absorbed by the absorbent body 51 is on the side. Even if it reaches the edge, the side nonwoven fabric 52 prevents the surface from oozing out and prevents the skin from getting wet.
[0004]
[Problems to be solved by the invention]
However, in the case of the absorbent article 50 having the above-described structure, the inner edge 52a of the side nonwoven fabric 52 has an overlap with the absorbent body 51 by a predetermined width b in the central portion of the absorbent body 51, and then the longitudinal direction. Therefore, in the front and rear parts of the absorbent body 51, the area that covers the absorbent body 51 by the side nonwoven fabric 52 inevitably increases, and the effective absorbent area of the absorbent body 51 is wider than the central part, There were problems such as not being used effectively.
[0005]
Moreover, since the said side nonwoven fabric 52 is completely joined with the liquid-permeable surface sheet 53 surface, the bodily fluid which flowed along the upper surface of the liquid-permeable surface sheet 53 gets over the said side nonwoven fabric 52, and leaks out. Or when the body fluid absorbed into the absorbent body 51 penetrates to the side edge and pressure is applied to the absorbent body 51 due to various actions of the wearer and the body fluid reverts. There were times when I got over and leaked.
[0006]
Therefore, the main problem of the present invention is to provide a sanitary napkin having side nonwoven fabrics along the longitudinal direction on both sides of the front surface side, ensuring a wide effective area of the absorbent body at the front end of the absorbent body, and preventing leakage from the front and rear portions. While preventing, it is in preventing side leakage from an absorber side part reliably.
[0007]
[Means for Solving the Problems]
In the present invention for solving the above problems, an absorbent body having a longitudinal intermediate portion formed narrower than the width of the front and rear portions is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, and In the sanitary napkin provided with side nonwoven fabrics along the longitudinal direction on both sides on the surface side,
Matching the inner edge of each side nonwoven fabric to the side edge shape of the absorbent body, the absorbent middle part passes through a position relatively closer to the center in the longitudinal direction, and the front and rear parts of the absorbent body have relatively sanitary napkins . A shape line including a curve line passing through the outer side position is provided , and the side nonwoven fabric has an overlap margin between the side nonwoven fabric and the absorbent body with a width of 2 to 8 mm over almost the entire length of the absorbent body. It is characterized by this.
[0008]
In the present invention, the inner edge of the side nonwoven fabric is curved to match the shape of the side edge of the absorber, so that a wide absorption effective width can be secured at the front and rear portions of the absorber, and leakage from the front and rear portions is ensured. Will come to prevent.
[0009]
Further, in order to reliably prevent side leakage, at least in the middle portion in the longitudinal direction of the absorbent body, the side nonwoven fabric is not substantially bonded to the liquid-permeable surface sheet surface of the absorbent body-disposed region, and It is desirable to form a body fluid containment pocket between the nonwoven fabric and the absorbent body. As a result, the side nonwoven fabric exhibits a certain amount of standing in the product state, and even if there is a body fluid that has flowed along the upper surface of the liquid-permeable surface sheet, the side nonwoven fabric does not get over the side nonwoven fabric, and a large amount of body fluid is absorbed by the pressure. Even if the body fluid is reversed, the body fluid is retained in the body fluid containment pocket, so that leakage from the lateral direction is surely prevented. As the side nonwoven fabric, a nonwoven fabric exhibiting water repellency, specifically a nonwoven fabric subjected to water repellency treatment, a laminated nonwoven fabric laminated with a waterproof film, or the like is preferably used in order to eliminate a feeling of wetness to the skin.
Further, a waterproof film may be used instead of the side nonwoven fabric.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a developed view of a sanitary napkin 1A according to the present invention, and FIG. 2 is a view taken along the line II-II in FIG.
[0011]
The sanitary napkin 1A includes a liquid-impervious back sheet 2 made of a polyethylene sheet and the like, a liquid-permeable front sheet 3 that allows permeation of menstrual blood, cages, and the like quickly, and an intervening space between the sheets 2 and 3. Absorbent body 4 made of cotton-like pulp or synthetic pulp, etc., crepe paper 5 surrounding the absorbent body 4 for maintaining the shape of the absorbent body 4 and improving diffusibility, and both sides of the surface in the longitudinal direction. It is comprised from the side nonwoven fabrics 6 and 6 formed along, and in the circumference | surroundings of the said absorber 4, the outer edge part of the said liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is in the upper-lower-end edge part. The liquid-impervious back sheet 2 and the side nonwoven fabric 6 that are joined by an adhesive such as hot melt or an adhesive means such as heat seal and that extend laterally from the absorbent body 4 at both side edges thereof. hot They are joined by adhesive means such as adhesive or heat sealing, such as belt.
[0012]
Hereinafter, the structure of the sanitary napkin 1A will be described in detail.
The liquid-impervious back sheet 2 is made of a sheet material having at least water shielding properties, such as a polyethylene sheet. In addition to this, a laminated non-woven fabric obtained by laminating a non-woven fabric on a polyethylene sheet or the like, or a waterproof film is further interposed. In addition, a non-woven fabric sheet (in this case, a water-impermeable back sheet is composed of a waterproof film and a non-woven fabric) can be used after ensuring liquid impermeability. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.
[0013]
Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace 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 terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft.
[0014]
When a large number of pores are formed in the liquid-permeable surface sheet 3, menstrual blood, venom, etc. (hereinafter collectively referred to as body fluids) are quickly absorbed, and are excellent in dry touch properties. It will be a thing. In this case, as in this example, a crepe paper 5 surrounding the absorbent body 4 is provided, so that the crepe paper 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result. For example, the crepe paper 5 having excellent absorbability quickly diffuses body fluid and prevents reversal of these menstrual blood.
On the surface of the liquid-permeable surface sheet 3, side embosses 7 and 7 projecting inward are formed in order to maintain the shape along the crotch.
[0015]
The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is composed of, for example, fluffy pulp and a water-absorbing polymer. The water-absorbing polymer is mixed in the pulp constituting the absorber as, for example, granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of price.
[0016]
As shown in the developed view of FIG. 1, the absorbent body 4 has a so-called gourd shape in which the central portion in the longitudinal direction is formed narrower than the width of the front and rear portions in order to reduce the contact with the crotch portion. . The planar shape of the absorbent body 4 only needs to be formed so that the central portion in the longitudinal direction is narrower than the width of the front and rear portions, and other than this shape, for example, an hourglass shape may be used.
[0017]
In the illustrated example, the width dimension of the liquid-permeable surface sheet 3 is slightly longer than the maximum width (front-rear part width) of the absorbent body 4 as shown in the cross-sectional views of FIGS. It stops only to cover the body 4, and side nonwoven fabrics 6 and 6 are provided on both sides of the surface side.
[0018]
The side nonwoven fabric 6 is originally provided to prevent the body fluid absorbed by the absorbent body 4 from reaching the side edge and then oozing out to the surface side. In particular, the inner edge 6 a of the side nonwoven fabric 6 is a curved line that matches the shape of the side edge 4 a of the absorbent body 4 in order to secure an absorption area at the front and rear portions of the absorbent body. That is, since the absorbent body 4 has a large absorption area at the front and rear portions, the inner edge 6a of the side nonwoven fabric 6 is matched with the shape of the side edge 4a of the absorbent body 4 in order to improve the absorption performance at the front and rear portions. In the middle part in the longitudinal direction, the shape line includes a curve line that relatively passes through the position on the center side in the longitudinal direction and the front and rear parts relatively pass through the position on the outer side of the absorbent article. As a result, the front and rear portions of the absorber 4 can have an effective width FB larger than the absorption area effective width CB in the central portion of the absorber, and a large absorption area can be secured. In addition, the overlap margin of the said side nonwoven fabric 6 and the absorber 4 does not necessarily need to be uniform along a longitudinal direction, and should just overlap with the width of predetermined width, specifically about 2-8 mm.
[0019]
As shown in FIG. 2, the side nonwoven fabric 6 does not substantially adhere the side nonwoven fabric 6 to the absorbent body 4 at least in the middle portion in the longitudinal direction of the absorbent body 4 (actually a liquid-permeable surface). The body fluid containment pockets P and P are formed between the side nonwoven fabric 6 and the absorbent body 4. Accordingly, in the product state, the side nonwoven fabric 6 exhibits a certain amount of standing upward toward the inner side, and even if there is a relatively viscous body fluid flowing along the upper surface of the liquid-permeable surface sheet 3, the side nonwoven fabric 6 can be overcome. In addition, the body fluid contained in the body fluid containment pockets P and P, and a large amount of body fluid penetrated into the side edge of the absorbent body, and pressure was applied to the absorbent body 4 due to various actions of the wearer and the body fluid returned. However, since the body fluid is retained in the body fluid containment pockets P, P, leakage from the lateral direction is surely prevented.
[0020]
The side nonwoven fabric 6 is configured by using a nonwoven fabric material that has been subjected to appropriate water-repellent treatment depending on the purpose of preventing menstrual blood, venom and the like from penetrating or enhancing the feeling of touch. . As such a side nonwoven fabric 6, natural fibers, synthetic fibers, regenerated fibers, or the like, which are formed by an appropriate processing method, can be used. Preferably, the basis weight is suppressed and air permeability is given. Nonwoven fabric should be used. Specifically, it is desirable to use a nonwoven fabric prepared with a basis weight of 18 to 23 g / m ² , and silicon-based, paraffin-based, alkylchromic chloride-based water repellents, etc. to reliably prevent the passage of body fluids. A water repellent nonwoven fabric coated with is preferably used. Moreover, it can replace with the said side nonwoven fabric 6, and can also use the laminated nonwoven fabric, waterproof film, etc. which laminated | stacked the waterproof film.
[0021]
An adhesive layer 8 is formed on the outer surface of the liquid-impermeable back sheet 2 by an appropriate application pattern for fixing to the shorts, and a release sheet 9 covering the adhesive layer 8 is provided.
[0022]
By the way, in this absorbent article, the shape of the inner edge 6a of the side nonwoven fabric 6 matches the shape of the absorbent body 4 (in the broad sense, the central part is narrow), and at least the central part of the absorbent body has an inwardly convex curve line. The shape of the product is not limited. For example, in the sanitary napkin 1B shown in FIG. 3, the inner edge 6a of the side nonwoven fabric 6 draws a curved line that protrudes inward at the center of the absorbent body, and extends linearly along the longitudinal direction at the front and rear portions. . The product shape is a so-called eyebrow shape in which the width of the napkin is substantially equal in the longitudinal direction.
[0023]
Also in the case of this sanitary napkin 1B, since the inner edge 6a of the side nonwoven fabric 6 has a curved line in accordance with the shape of the side edge 4a of the absorbent body 4 at least in the middle part of the absorbent body, absorption is effective at the front and rear parts of the absorbent body 4. A wide width can be secured, so that leakage from the front and rear portions can be surely prevented, and side leakage can be reliably prevented by forming the body fluid containment pockets P and P.
[0024]
【The invention's effect】
As described above in detail, according to the present invention, in the sanitary napkin having side nonwoven fabrics along the longitudinal direction on both sides of the surface side, the effective area of the absorbent body is widely secured in the front and rear parts of the absorbent body, While preventing a leak, a side leak can be reliably prevented from the absorber side part.
[Brief description of the drawings]
FIG. 1 is a development view of a sanitary napkin 1A according to the present invention.
FIG. 2 is a view taken along the line II-II in FIG.
FIG. 3 is a development view showing another example of the sanitary napkin according to the present invention.
FIG. 4 is a development view showing a conventional sanitary napkin.
[Explanation of symbols]
1A, 1B ... sanitary napkin, 2 ... liquid-impervious back sheet, 3 ... liquid-permeable top sheet, 4 ... absorbent, 5 ... crepe paper, 6 ... side nonwoven fabric

Claims (4)

Between the liquid-permeable top sheet and the liquid-impervious back sheet, an absorbent body is formed in which the intermediate portion in the longitudinal direction is narrower than the width of the front and rear portions, and the both sides on the surface side are along the longitudinal direction. In sanitary napkins with side nonwoven fabric,
Matching the inner edge of each side nonwoven fabric to the side edge shape of the absorbent body, the absorbent middle part passes through a position relatively closer to the center in the longitudinal direction, and the front and rear parts of the absorbent body have relatively sanitary napkins . A shape line including a curve line passing through the outer side position is provided , and the side nonwoven fabric has an overlap margin between the side nonwoven fabric and the absorbent body with a width of 2 to 8 mm over almost the entire length of the absorbent body. A sanitary napkin characterized by that. At least in the middle portion in the longitudinal direction of the absorbent body, the side nonwoven fabric is not substantially bonded to the liquid-permeable surface sheet surface of the absorbent body-disposed region, and a body fluid containment pocket is provided between the side nonwoven fabric and the absorbent body. The sanitary napkin according to claim 1 formed. The sanitary napkin according to claim 1, wherein a nonwoven fabric exhibiting water repellency is used as the side nonwoven fabric. The sanitary napkin according to any one of claims 1 to 3, wherein a waterproof film is used instead of the side nonwoven fabric.

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