JP2000254166A - Absorptive article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorptive article having an absorber exhibiting an equal elasticity restoration property even to compressive deformation from all directions and has a high fitting property. SOLUTION: The absorber of the absorptive article 1, which includes a liquid permeable front surface material 2, a liquid impermeable rear surface material, and the liquid holdable absorber held between the front surface material 2 and the rear surface material 2 and is substantially longitudinally long, has a built-up part 6 in a position corresponding to the excretion section of a wearing person. This built-up part 6 is formed by horizontally providing the absorptive article 1 with a columnar body 9 consisting of a laminated sheet of absorption sheets and elastic sheets in the longitudinal direction of the article.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article provided with an absorbent having a shape that fits the excretion site of a wearer.

[0002]

2. Description of the Related Art As a conventional technique, a raised portion is provided on an absorbent body of a sanitary napkin, and the raised portion is fitted to an excreted part of a wearer. No. 57-153649 and Japanese Utility Model Application Laid-open No. 3
The one described in JP-A-118727 is known.

[0003] However, the absorbent body in the sanitary napkin described in the above publication has insufficient elastic recovery when it is compressed and deformed by the wearer's body pressure at the time of wearing. For example, the fitting property is reduced. In particular, the absorbent body in the sanitary napkin described in Japanese Utility Model Laid-Open Publication No. 3-118727 has a remarkable decrease in fit because the elastic recovery differs in the thickness direction and the width direction of the napkin (because of anisotropy). .

[0004] Accordingly, an object of the present invention is to provide an absorbent article having a high fit and having an absorbent body exhibiting the same elastic recovery property even in compressive deformation from all directions.

[0005]

Means for Solving the Problems The present inventors provide the above object by providing a ridge formed of a specific sheet and having a specific three-dimensional shape at a position corresponding to the excretion site of the wearer in the absorber. Was found to be achieved.

The present invention has been made on the basis of the above findings, and is directed to a liquid-permeable surface material, a liquid-impermeable back material, and a liquid-retentive absorbing material interposed between the surface material and the back material. In a substantially vertically absorbent article comprising a body, the absorbent body has a raised portion at a position corresponding to the excretion site of a wearer,
The protruding portion achieves the above object by providing an absorbent article in which a columnar body made of a laminated sheet of an absorbent sheet and an elastic sheet is formed so as to extend along the longitudinal direction of the absorbent article. Things.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the absorbent article according to the present invention will be described below with reference to the drawings using a sanitary napkin as an example.

As shown in FIGS. 1 and 2, a sanitary napkin 1 of this embodiment comprises a liquid-permeable surface material 2, a liquid-impermeable back material 3, and a space between the surface material 2 and the back material 3. And a liquid retaining absorber 4 interposed therebetween, and is formed substantially vertically long.

As the surface material 2, a sheet having a large number of openings in a nonwoven fabric such as a suction heat-bonded nonwoven fabric, a sheet having a large number of openings in a film such as a polyethylene film, or the like can be used. Further, as the back surface member 3, a film such as a polyethylene film can be used.

Thus, in the sanitary napkin 1 of the present embodiment, as shown in FIGS. 1 and 2, the absorbent body 4 has a flat lower absorbent portion 5 having a shape conforming to the outer shape of the sanitary napkin 1. And a raised portion 6 located on the lower absorbing portion 5 and raised toward the surface material 2. The raised portion 6 is located at a position corresponding to the excretion site of the wearer in plan view of the sanitary napkin 1. The raised portion 6 is formed by arranging a columnar body 9 formed of a laminated sheet of an absorbent sheet 7 and an elastic sheet 8 along the longitudinal direction of the sanitary napkin 1. Such a raised portion 6 has a sufficient elastic recovery property and shows the same elastic recovery property even when subjected to compressive deformation from all directions, so that the fit of the sanitary napkin 1 is extremely high. In addition, it is less likely that positional displacement or deflection due to long-time wearing or exercise of the wearer will occur.

As shown in FIG. 3, the columnar body 9 constituting the raised portion 6 is formed by winding a laminated sheet 10 obtained by laminating an absorbent sheet 7 and an elastic sheet 8 having the same shape. I have. As a result, the absorption sheet 7 is
Is continuous from the outer surface to the center in the radial direction (ie, since the absorbent sheet 7 is not divided by the elastic sheet 8), the entire area of the absorbent sheet 7 is effective for absorbing liquid. Sanitary napkin with excellent absorbability can be obtained. That is, in the sanitary napkin 1 of the present embodiment, the liquid absorbed on the outer surface of the cylindrical body 9 is spirally diffused from the outer surface to the inside of the cylindrical body 9 and reaches the center in the radial direction.

Prior to winding the laminated sheet 10, an adhesive such as a hot melt adhesive is applied between the absorbent sheet 7 and the elastic sheet 8, or both sheets 7 and 8 are embossed to be laminated. The sheet 10 may be used as an integrated product of the two sheets 7 and 8. This makes it possible to further improve the fitting property and the absorptivity of the raised portion 6.

The cylindrical body 9 obtained by winding the laminated sheet 10 may have either the absorbent sheet 7 or the elastic sheet 8 on its outer surface (in FIG. 3, the absorbent sheet 7 is located on the outer surface). ). However, when the laminated sheet 10 is wound so that the elastic sheet 8 is positioned on the outer surface of the cylindrical body 9, the elastic sheet 8 is absorbed by the liquid in order to make the liquid absorbing performance of the cylindrical body 9 sufficient. It is preferable to make it.

As the absorbent sheet 7 constituting the columnar body 9, a sheet capable of absorbing and retaining a liquid is used. Examples of the absorbent sheet 7 are wet paper-made thin paper (tissue paper) and pulp fiber sheeted with a binder. And dry absorbent pulp sheets, and absorbent sheets containing pulp fibers and superabsorbent polymer particles, wherein the superabsorbent polymer particles are dispersed in a layered or three-dimensional manner in the pulp fibers. The absorbent sheet 7 has a basis weight of 5 to 200 g /
m ² , particularly preferably from 40 to 100 g / m ² , is preferable from the viewpoints of improvement in absorbability and prevention of twist. Further, the thickness is more preferably from 0.2 to 2.5 mm, particularly preferably from 0.3 to 1.0 mm.

On the other hand, as the elastic sheet 8, a sheet having a compression recovery property is used. Specific examples of the elastic sheet 8 include a nonwoven fabric mainly composed of fibers having a heat-fusing property,
And a foam material sheet formed from polyethylene, polypropylene, polybutylene, polyester, polyurethane, silicone elastomer, or the like. In particular, it is preferable that the elastic sheet 8 has a bulk recovery force of 2 to 100 cN, particularly 10 to 80 cN, from the viewpoint of preventing deformation and improving the feeling of wearing. The bulk recovery force is determined by the elastic sheet 8
Was cut into a cylindrical shape having a height of 30 mm and a diameter of 44.6 mm using a sample piece cut into a length of 30 mm and a width of 150 mm (this sample has an overlap portion of 10 mm) in the height direction. 50% at 10mm / min speed
When restored to a 30% compressed state after compression (ie, when restored to a height of 70% of the height before compression)
Defined as the value of the stress. Note that there is no particular limitation on the directionality when the sample piece is cut out from the elastic sheet 8. For the above measurement, Tensilon manufactured by Orientec Co., Ltd. was used, and a circular probe having a diameter of 10 cm was used.

When the elastic sheet 8 is located on the outer surface of the cylindrical body 9, as described above, it is preferable that the elastic sheet 8 is liquid-permeable. As the liquid-permeable elastic sheet 8,
Examples thereof include those formed from a hydrophilic material or subjected to a hydrophilization treatment to be made hydrophilic.

The elastic sheet 8 has a basis weight of 5 to 100 g.
/ M ² , particularly preferably 15 to 80 g / m ² , from the viewpoint that bulk recovery can be more easily developed. Further, the thickness is more preferably 0.2 to 5.0 mm, particularly preferably 0.5 to 2.0 mm.

The cylindrical body 9 composed of the absorbent sheet 7 and the elastic sheet 8 is designed to improve the fit to the excretory part.
Its diameter is 10 to 70 mm, especially 20 to 50 mm, and its length (height) is 10 to 250 mm, especially 50 to 150.
mm. The ratio of the length (height) of the cylindrical body 9 to the entire length of the sanitary napkin 1 is 5 to 100%, particularly 10 to 10 from the viewpoint of improving the fit to the excretory part.
Preferably it is 50%.

The columnar body 9 exhibits sufficient elastic recovery from compressive deformation due to the wearer's body pressure, prevents twisting,
5 in the radial direction from the viewpoint of maintaining a good wearing feeling.
0% compressive stress is 100 to 3000 cN, especially 500 to 2
000 cN is preferred. The 50% compressive stress is a stress when the cylindrical body 9 is compressed at a speed of 10 mm / min in the radial direction to a thickness of 50% before compression (that is, a thickness of half the diameter before compression). Defined.
For the above measurement, using Orientec Tensilon,
In addition, a circular probe having a diameter of 10 cm was used.

The columnar body 9 has the same elastic recovery even when it is compressed and deformed from all directions. That is,
The cylindrical body 9 is isotropic with respect to its radial compression deformation. Therefore, for the 50% compressive stress, the ratio of a value measured in a certain radial direction to a value measured in a direction perpendicular to the radial direction (however, the larger value is used as a denominator) is 0.5 or more. In particular, it is preferably 0.7 or more from the viewpoint of exhibiting a sufficient elastic recovery from compressive deformation from any direction. The maximum value of this ratio is of course 1. The direction in which the value serving as the denominator is large (measurement direction) is preferably the direction from the surface material 2 to the back material 3 of the absorbent article.

In order for the columnar body 9 to exhibit a more sufficient elastic recovery property and to improve the anti-dripping effect and the followability to the body, its 30% compression recovery force in the radial direction is 30 to 250 c.
N, particularly preferably 50 to 150 cN. The 30% compressive recovery force is obtained by measuring the 50% compressive stress of the cylindrical body 9 by the above-described method, and then recovering to a 30% compressed state at a speed of 10 mm / min (that is, 70% of the diameter before compression).
% When restored to a thickness of%). Further, the 30% compressive recovery force is measured in a direction perpendicular to the radial direction and the value of the 30% compressive recovery force measured in a certain radial direction for the same reason as in the case of the 50% compressive stress described above. It is preferable that the ratio with respect to the calculated value (the larger value is the denominator) is 0.5 or more, particularly 0.7 or more. The direction in which the value serving as the denominator is large (measurement direction) is preferably the direction from the surface material 2 to the back material 3 of the absorbent article. In the above measurement, Tensilon manufactured by Orientec Co., Ltd. was used, and a circular probe having a diameter of 10 cm was used.

The absorber 4 together with the raised portion 6 composed of the cylindrical body 9
The lower absorbent portion 5 comprises a wet paper mainly composed of pulp fibers, a dry pulp sheet in which pulp fibers are sheeted with a binder, pulp fibers and superabsorbent polymer particles. It is formed from an absorbent sheet or the like which is dispersed in a layered or three-dimensional shape in pulp fibers. The raised portion 6 is fixed to the lower absorbing portion 5 by an adhesive 11 such as a hot melt adhesive.

As described above, the raised portion 6 is located at a position corresponding to the excretion site of the wearer in the plan view of the sanitary napkin 1. Specifically, it is located at the rear part of the sanitary napkin 1 along the center line in the width direction of the sanitary napkin 1. The distance between the rear end of the sanitary napkin 1 and the rear end of the cylindrical body 9 constituting the protruding portion 6 is 10 to 10 with respect to the entire length of the sanitary napkin 1 from the viewpoint of achieving a sufficient fit.
Preferably, the length is 80%, especially 20 to 60%. On the other hand, the distance between the front end of the sanitary napkin 1 and the front end of the cylindrical body 9 is 10 to 80%, particularly 20 to 60%, based on the total length of the sanitary napkin 1 for the same reason.
It is preferable that the length be such that

The absorbent article of the present invention is not limited to the above embodiment, and various modifications are possible. For example, one or both of the front and rear ends of the raised portion 6 may be formed in a conical shape or a truncated conical shape to further improve the fit.
Further, the columnar body 9 may be formed of, in addition to the absorbing sheet 7 and the elastic sheet 8, another sheet for giving desired characteristics to the columnar body 9. In addition, the absorbent article of the present invention is not limited to sanitary napkins, but can be applied to other absorbent articles such as incontinence pads and vaginal discharge sheets.

Example 1 Absorbent paper mainly composed of pulp fibers having a basis weight of 100 g / m ² and a thickness of 0.8 mm, and a basis weight of 50 g / m ² composed of polyethylene fibers and a thickness of 1.
A laminated sheet obtained by unifying an elastic sheet made of a nonwoven fabric having a thickness of 0 mm and a bulk recovery force of 18 cN with a hot-melt adhesive is wound around an absorbent paper as an outer surface, and has a diameter of 3 mm.
A cylinder having a length of 0 mm and a length of 70 mm was obtained. The above-mentioned columnar body was laid and fixed via a hot-melt adhesive on a lower absorbent portion composed of a sheet in which pulp fibers and particles of a superabsorbent polymer were integrated to form a raised portion, thereby obtaining an absorber. The upper surface side (elevated portion side) of the obtained absorber is covered with a liquid permeable surface sheet having a large number of holes formed in a suction heat-bonded nonwoven fabric, and the lower surface side (lower absorbent portion side) is made of a polyethylene sheet. 1 by covering with a liquid-impermeable back sheet and heat-sealing the peripheral portions of both sheets.
And a sanitary napkin shown in FIG. 2 (total length 230 m).
m). The distance between the rear end of the obtained sanitary napkin and the rear end of the raised portion was 130 mm. In the obtained sanitary napkin, the 50% compressive stress and the 30% restoring force of the bulge (columnar body) were measured in the thickness direction of the napkin (referred to as longitudinal direction) and the width direction perpendicular to the napkin (referred to as lateral direction). When measured by the method, the values shown in Table 1 were obtained.

Examples 2 to 4 and Comparative Example 1 The same as Example 1 except that the elastic sheet used in the columnar body constituting the raised portion in Example 1 has a bulk recovery force shown in Table 1 To obtain a sanitary napkin. still,
The sheet used in Comparative Example 1 was a simple non-woven fabric having no elasticity. Table 1 shows the 50% compressive stress and 30% resilience of the bulge (columnar body) in these sanitary napkins measured in the same manner as in Example 1.

[Evaluation of Performance] In order to evaluate the performance of the sanitary napkins obtained in the examples and comparative examples, the following methods were used to evaluate the fit and the frequency of occurrence of twist / shift. Table 1 shows the results.

<Fitness and frequency of occurrence of misalignment / displacement>
Each sanitary napkin was worn by 30 monitors, and a fit sensory test (see Table 1 for evaluation criteria) was conducted, and the occurrence frequency of twists / shifts was investigated.

[0029]

[Table 1]

As is clear from the results shown in Table 1, the sanitary napkin of the example (the product of the present invention) has a higher fitting property than the sanitary napkin of the comparative example, and the napkin and slippage during wearing are improved. Absent.

[0031]

According to the present invention, there is provided an absorbent article having a high fit and provided with an absorber exhibiting the same elastic recovery property even in compressive deformation from all directions. Further, according to the present invention, there is provided an absorbent article which is free from slippage or slippage during wearing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sanitary napkin as one embodiment of an absorbent article according to the present invention.

FIG. 2 is a sectional view taken along line II in FIG.

FIG. 3 is a schematic view illustrating a method for manufacturing a cylindrical body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Surface material 3 Back surface agent 4 Absorber 5 Lower absorption part 6 Raised part 7 Absorption sheet 8 Elastic sheet 9 Columnar body

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuya Kusakawa 2606 Kabane-cho, Akaga-cho, Haga-gun, Tochigi Prefecture, Japan (72) Inventor Takao Nakayama 2606 Kabane-cho, Akaba-cho, Haga-gun, Tochigi Prefecture, Kao Corporation ( 72) Inventor Minoru Nakanishi 2606 Akabane, Kakaicho, Haga-gun, Tochigi Prefecture F-term in Kao Corporation Research Laboratory 4C003 EA02 HA05

Claims (5)

[Claims] 1. A substantially elongated absorbent comprising a liquid-permeable surface material, a liquid-impermeable back material, and a liquid-retentive absorber interposed between the surface material and the back material. In the article, the absorber has a raised portion at a position corresponding to the excretion site of the wearer, and the raised portion has a columnar body made of a laminated sheet of an absorbent sheet and an elastic sheet in a longitudinal direction of the absorbent article. Absorbent article formed horizontally along. 2. The absorbent article according to claim 1, wherein the column-shaped raised portion is formed by winding the laminated sheet. 3. 50% of the cylindrical protrusion in the radial direction.
The compressive stress is 100 to 3000 cN.
The absorbent article according to the above. 4. The method according to claim 1, wherein the cylindrical bulge is radially reduced by 50%.
The absorbent article according to any one of claims 1 to 3, wherein a restoring force when restored to a 30% compressed state after compression is 30 to 250 cN. 5. The method according to claim 5, wherein the column-shaped ridges are radially reduced by 50%.
The ratio between the restoring force when restored to a 30% compressed state after compression and the 30% compressed restoring force measured in a direction perpendicular to the radial direction (the larger value is the denominator).
Is 0.5 or more, the absorbent article according to any one of claims 1 to 4.