JP2003180734A - Absorbable article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent front spillage effectively while improving fitness on human bodies. <P>SOLUTION: In a sanitary napkin 1 in which an absorbent 4 is interposed between a liquid permeable top sheet 3 and a liquid impermeable back sheet 2 while three-dimensional gathers 7 and 7 are so arranged along both side parts on the surface side thereof as to be erected on the surface side thereof by a shrinking force with an elastically stretching member 17 covering specified sections along the length thereof, the rough center points of the erected sections L of the three-dimensional gathers 7 are located at least 20 mm ahead of the humor discharge site H. The front end part of the sanitary napkin 1 is also erected in a curve by the stretching force with the elastically stretching member 17 for making the solid gathers erect while the height of the erection should be 10 mm or more. <P>COPYRIGHT: (C)2003,JPO

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. The present invention relates to an absorbent article having improved properties.

[0002]

2. Description of the Related Art Conventionally, as absorbent articles such as sanitary napkins, panty liners, and incontinence pads, liquid-impermeable back sheets such as polyethylene sheet or polyethylene laminated sheet non-woven fabric, and non-woven fabric or liquid-permeable plastic sheet 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.

Many improvements have been made to this type of absorbent article, and various measures have been taken to prevent leakage of body fluid. As one of these body fluid leakage prevention means, there is one provided with three-dimensional gathers for preventing lateral leakage on both surface side portions. For example, the sanitary napkin 50 shown in FIG.
Then, by arranging the side nonwoven fabrics 51, 51 on both sides of the absorbent body and arranging one or a plurality of elastic stretchable members 52 inside the side nonwoven fabric 51 in a stretched state, the elastic stretchable member 52 contracts the surface. Three-dimensional gathers 53, 53 standing upright are formed, and wings W, W projecting laterally are formed on both sides of the body fluid discharge site H, respectively. On the non-use surface side of the napkin main body, for example, a plurality of adhesive layers are formed in order to prevent misalignment at the time of mounting, and the non-use surface side of the wings W, W is also adhered similarly. An agent layer is formed (not shown).

To fix the sanitary napkin 50 to the undergarment 30, as shown in FIG.
The wings W, W which are applied locally and project laterally.
Take it out of the underwear and wrap it around the crotch part of the underwear while adhering to the outer surface of the crotch part of the underwear.

The upright section of the three-dimensional gather 53 substantially corresponds to the wing W, that is, the body fluid discharge portion H.
Corresponding to the above, it is arranged on both sides of the body fluid, and is formed with a section width that is substantially symmetrical in the front-rear direction around the body fluid discharge site H, and the entire product is gently curved to fit the body and prevent side leakage. ing.

[0006]

However, in the body shape of a woman, the body line from the lower abdomen to the crotch and the body line from the crotch to the buttocks are not symmetrically curved, and are usually , The body line from the crotch to the buttocks side is a gentle curved line. as a result,
From the crotch part to the buttocks side, a napkin is attached along the body and it is difficult to make a gap, whereas in the part from the lower abdomen to the crotch part, the napkin shape cannot follow a tight curved curve,
When seated or standing up, a gap may occur between the napkin and the body in the front part, which may cause front leakage.

[0007] Therefore, a main object of the present invention is to provide an absorbent article which improves fit to the body and can effectively prevent front leakage.

[0008]

In order to solve the above problems, according to the present invention according to claim 1, an absorbent body is interposed between a liquid permeable top sheet and a liquid impermeable back sheet,
And in the absorbent article provided with the three-dimensional gathers standing up on the front side by the contracting force of the elastic stretchable member along the front-rear direction on the both sides of the front side along the front-rear direction, the substantially central point of the standing section of the three-dimensional gather is absorbable. There is provided an absorbent article, which is located in front of a body fluid discharge site in the article.

According to the second aspect of the present invention, the absorbent article according to claim 1, wherein a substantially central point of the standing section of the three-dimensional gather is located at least 20 mm or more in front of a body fluid discharge site in the absorbent article. Will be provided.

According to a third aspect of the present invention, the front end portion of the absorbent article is erected in a curved shape by the contracting force of the elastic stretchable member that erects the three-dimensional gather.
An absorbent article according to any one is provided.

As the present invention according to claim 4, there is provided the absorbent article according to claim 3, wherein the standing height of the front end portion of the absorbent article is 10 mm or more.

The present invention according to claim 5 provides the absorbent article according to any one of claims 1 to 4, wherein the distance from the front end of the absorbent article to the body fluid discharge site is 60 mm or more.

[0013]

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, FIG. 3 is a view taken along the line III-III of FIG. 1, and FIG. of
It is a IV-IV line arrow line view.

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 permeation 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 diffusivity, and is provided so as to project to the front surface side in a predetermined section in the front-rear direction with substantially opposite side edges of the absorbent body 4 as standing base ends. The absorbent body 4 is composed mainly of a pair of left and right three-dimensional gathers 7, 7 and the liquid-impermeable back sheet 2 and the liquid-permeable top sheet 3 are formed at the upper and lower edges of the absorbent body 4. The liquid-impervious backsheet 2 whose outer edge portions are joined by an adhesive such as hot melt or an adhesive means such as heat seal, and both side edge portions thereof extend laterally beyond the absorbent body 4, and the three-dimensional body. The side non-woven fabric 6 forming the gather 7 is joined by an adhesive such as hot melt or an adhesive means such as heat seal, and the composite sheet portion formed by the liquid-impervious back sheet 2 and the side non-woven fabric 6 is joined. Wings W projecting laterally, W is formed. In the present invention, in particular, in order to improve the fit to the body and effectively prevent front leakage,
The standing section of the three-dimensional gather 7 is positioned relatively to the front side of the portion H (body fluid discharge portion) where body fluid such as menstrual blood is discharged.

The structure of the sanitary napkin 1 will be described in detail below. The liquid impermeable back sheet 2 will be described below.
As the material, 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.

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.

Further, when a large number of through holes are formed in the liquid permeable top sheet 3, menstrual blood, sores and the like (hereinafter collectively referred to as body fluids) can be quickly absorbed, and dry. The touch will be excellent.

As the absorbent body 4, any material capable of absorbing and retaining body fluid may be used, and fiber stack pulp, airlaid, pulp nonwoven fabric, etc. are used. In general, fluffy pulp in which a water-absorbent polymer powder is mixed is preferably used from the viewpoint of absorption function and price. As shown in the figure, the absorbent body 4 is preferably surrounded by crepe paper 5 in order to maintain its shape.

On the other hand, on the surface of the liquid permeable top sheet 3,
Along the peripheral edge of the middle-high part 11 for holding the middle-high part 11 formed in the range including the body fluid discharge site H at a predetermined position, swelling it properly to the surface side, and confining the absorbed body fluid. An oval-shaped emboss 12 is formed. In addition, in the front region, a substantially inverted U-shaped emboss 13 in which both ends of the arc-shaped emboss are directly extended to the middle height portion 11 side and a circular arc-shaped emboss 14 are formed inside thereof, and in the rear region, Substantially U-shaped embossments 15 are formed by extending both ends of the arcuate embossment to the side of the middle height portion 11 as they are.

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 absorbent body 4 as shown in the transverse sectional views of FIGS. The three-dimensional gather 7 prevents the side non-woven fabric 6 different from the liquid-permeable top sheet 3 from being permeated, specifically, menstrual blood, a stuff, and the like, or enhances the feeling of touch. Depending on the purpose, it is constructed by using a non-woven fabric material that has been subjected to appropriate water repellent treatment or hydrophilic treatment. The side nonwoven fabric 6 may be made of natural fibers, synthetic fibers, regenerated fibers, or the like and formed by an appropriate processing method, but it is preferable to eliminate the stickiness and prevent stuffiness. Therefore, it is preferable to use a non-woven fabric having a low basis weight and breathability.
Specifically, it is desirable to use a non-woven fabric made with a basis weight of 18 to 23 g / m ² , and to reliably prevent permeation of body fluids, silicone-based, paraffin-based, alkylchromic chloride-based water repellents, etc. A water repellent non-woven fabric coated with is preferably used.

As shown in FIGS. 2 and 3, the side nonwoven fabric 6 has an absorbent body 4 on the outer side from the middle portion in the width direction.
The side non-woven fabric 6 and the liquid-impervious backsheet 2 are bonded to each other by 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 backsheet 2. The pair of left and right wings W, W are formed at the absorbent body side position substantially corresponding to the body fluid discharge site H by the laminated sheet part. This wing W, W
On the outer surface side (the liquid-impervious back sheet 2 side) of the
6, 16 and, as shown in FIG. 5, shorts 30
When it is attached to the, the sanitary napkin 1 is fastened by folding it back to the opposite side at the folding line RL and winding it around the crotch part of the shorts.

The inside portion of the side nonwoven fabric 6 is folded back substantially double, and inside the double sheet, one or a plurality of portions are fixed at the middle portion in the height direction at both ends or at appropriate positions in the longitudinal direction. In the illustrated example, three thread-like elastic expansion / contraction members 17, 17 ... Are arranged, and the contraction force causes the double sheet portion to stand upright on the front surface side to form three-dimensional gathers 7, 7. Although the three-dimensional gather 7 is erected outwardly in an inverted V shape in this example, it may be erected inwardly in a V shape, or may be formed by increasing the number of folding steps. You may make it stand up.

In the sanitary napkin 1, in order to improve the fit to the body and effectively prevent the front leakage, the formation position of the three-dimensional gather 7 is set at a substantially central point of the standing section L. The napkin 1 for use is located in front of the body fluid discharge site H. In this case, the distance L _S from the approximate center point of the standing section of the three-dimensional gather to the body fluid discharge site H of the sanitary napkin 1.
Is at least 20 mm or more, preferably 30 mm or more. When the distance L _S is less than 20 mm,
The effective difference between the body fluid discharge part H and the conventional napkin in which the three-dimensional gather 7 formation position is made coincident is not clear, and the front leakage cannot be effectively prevented.

The distance L _K from the front end of the standing range L of the three-dimensional gather 7 to the front end of the napkin 1 is 10
It is desirable to set it to 50 mm. If the distance L _K is less than 10 mm, the elastic expansion / contraction member 17 tends to be uncertainly bonded in the manufacturing line, and if it exceeds 50 mm, the contraction force of the elastic expansion / contraction member 17 can act on the front end of the napkin. Therefore, it becomes difficult to raise the front end of the napkin in a curved shape.

By positioning the three-dimensional gather 7 in front of the body fluid discharge portion H, the front end portion of the sanitary napkin 1 is shown in FIG. 4 due to the contracting force of the elastic stretchable members 17, 17 ... Standing up the three-dimensional gather 7. As shown, it rises in a curved shape. As a result, the shape of the napkin becomes closer to the body shape of the woman, so that the fitting property is increased and the front leakage can be effectively prevented. In addition, since the three-dimensional gather 7 is located on the front side where a gap with the body is easily formed, it is possible to reliably prevent lateral leakage on the front side of the napkin.

On the other hand, the distance L _M of the front end portion of the sanitary napkin 1 to the fluid drainage site H is 60mm or more, preferably it is desirable to or more 70 mm. Even if the distance L _M is less than 60 mm, the front portion of the napkin 1 can be formed into a curved rising shape, but the front end of the product is rounded with a large curvature, and conversely the fit to the body is lost. As a result, a gap with the body is likely to be formed, and front leakage cannot be effectively prevented.

As for the rising shape of the front portion of the napkin, in FIG. 4, the standing height H of the front end portion of the sanitary napkin 1, that is, the height difference between the front end portion of the napkin and the lower surface of the napkin corresponding to the body fluid discharge site H is 10 mm or more. And the angle θ between the tangent to the front end of the napkin and the horizontal plane is 10
It is desirable that the angle is 90 °, preferably 30 to 70 °. By erecting the front end portion of the napkin at such an erecting height and erecting angle, the shape of the napkin 1 can be surely fitted along the shape of the crotch portion from the lower abdomen of the body, making it difficult to form a gap with the body. Therefore, the front leakage can be effectively prevented.

On the other hand, the standing gathering height H _G of the three-dimensional gather 7 must be at least 3 mm or more in order to reliably prevent the leakage of menstrual blood or the like leaking from the absorbent body 4 at the position in front of the body fluid discharge site H. Therefore, it is preferably 5 mm or more.
In addition, the elastic stretchable member 17 that raises the three-dimensional gather 7
Has an elastic elongation of 110 to 200% and a contraction force of 4.51 × 10 ^-2.
It is good to arrange in the range of up to 1.81N.

By the way, the position of the body fluid discharge site H is
As in this example, the approximate center position of the middle high portion 11 and the wings W
The center position of the curved line (fit cut) formed on the side edge portion of the absorber other than the middle height portion 11 and the wings W, and the like. Further, particularly in the case of a simple napkin that does not have these wings and fit cuts, it is specified as the substantially vertical center position.

[0030]

As described above in detail, according to the present invention, there are advantages that the fitting property to the body is improved and that front leakage can be effectively prevented.

[Brief description of drawings]

FIG. 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.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a view taken along the line IV-IV of FIG.

FIG. 5 is a view showing a mounted state of the napkin 1.

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

[Explanation of symbols]

1 ... Sanitary napkin, 2 ... Liquid-impermeable backsheet, 3 ...
Liquid-permeable topsheet, 4 ... Absorber, 5 ... Crepe paper, 6
... Side non-woven fabric, 7 ... Three-dimensional gather, 11 ... Middle-high section, 1
2 to 15 ... Embossing, H ... Body fluid discharge site

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Iwao Goto, inventor             151-2 Atsuhara, Fuji City, Shizuoka Prefecture Daiosani             Tally Products Co., Ltd. F term (reference) 3B029 BD13 BD14                 4C003 CA01 CA06 DA06 HA05                 4C098 AA09 CC22 DD01 DD03 DD05                       DD10 DD12 DD25 DD26 DD28

Claims (5)

[Claims] 1. An absorbent body is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a contraction force by an elastic stretchable member is applied to both side portions of the front surface along a front-back direction over a predetermined section. In an absorbent article having a three-dimensional gather standing upright on the front surface side, the substantially central point of the standing section of the three-dimensional gather is located in front of a body fluid discharge site in the absorbent article. . 2. The substantially central point of the standing section of the three-dimensional gather is at least 20 from the body fluid discharge site in the absorbent article.
The absorbent article according to claim 1, wherein the absorbent article is located on the front side by not less than mm. 3. The absorbent article according to claim 1, wherein the front end portion of the absorbent article stands up in a curved shape by the contracting force of the elastic stretchable member that raises the three-dimensional gathers. 4. The standing height of the front end of the absorbent article is 10 mm.
The absorbent article according to claim 3, which is the above. 5. The absorbent article according to claim 1, wherein the distance from the front end portion of the absorbent article to the body fluid discharge site is 60 mm or more.