JP2001309943A - Absorber for sanitary pad - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorber which is stored in a storage of a sanitary pad and has high hydrolyzability in water. SOLUTION: This absorber for a sanitary pad which is stored in the storage 4 of the pad A is has a water soluble resin layer 12 integrally laminated on the whole surface of a water hydrolyzable base material 11 so that it has high hydrolyzability in water and can be disposed of by flushing down into toilets.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sanitary napkin,
The present invention relates to an absorbent body that is stored and used in a storage body for a sanitary pad such as a vaginal absorbent pad and a pad for incontinent persons, and more particularly to an absorbent body for a sanitary pad excellent in water disintegration that can be dumped in a flush toilet or the like.

[0002]

2. Description of the Related Art Sanitary pads such as sanitary napkins, vaginal absorbent pads and incontinent pads have been used. An absorbent is stored in the storage body of the sanitary pad, and the absorbent is configured to absorb and hold body fluids such as blood, vaginal discharge, and urine.

[0003] Japanese Patent No. 2890022 discloses a water-absorbing resin particle used for an absorbent body of such a sanitary pad, which is obtained by treating a water-absorbing resin particle with a silicone-based surfactant. Resin particles are disclosed.

However, since the absorbent using the water-absorbent resin particles does not have water dissolving property, it cannot be treated by flowing into a toilet or the like. There was a problem that it would.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides an absorbent body for a sanitary pad having excellent water dissolvability, which is used by being housed in a sanitary pad housing.

[0006]

The absorbent body for a sanitary pad according to claim 1 is an absorbent body for a sanitary pad used by being housed in a housing body for a sanitary pad.
It is characterized in that a water-soluble resin layer is integrally laminated on one surface of a water-disintegrable base material.

[0007] The absorbent body for a sanitary pad according to claim 2 is
The absorbent body for a sanitary pad according to claim 1, wherein a leak-proof layer is interposed between the water-decomposable base material and the water-soluble resin layer.

[0008]

The absorbent body of the sanitary pad of the present invention is formed by integrally laminating a water-soluble resin layer on one surface of a water-decomposable base material. it can.

In addition, the absorbent body of the sanitary pad has a water-soluble resin layer integrally laminated on one surface of the water-disintegrable substrate that absorbs and retains bodily fluids. The bodily fluid does not leak to the back material side of the storage body of the sanitary pad.

Furthermore, since the water-soluble resin layer is integrally laminated on one surface of the water-disintegrable base material, the water-soluble resin layer has excellent water pressure resistance. The absorbed and retained body fluid hardly leaks out of the water-decomposable substrate.

Further, when a leak-proof layer is interposed between the water-decomposable base material and the water-soluble resin layer, the water-resistant pressure of the water-absorbing body can be further improved. Even when a larger pressure is applied, the body fluid absorbed and retained in the water-disintegrable base material is more reliably retained and does not leak to the outside.

Further, although the above-mentioned leak-proof layer has water repellency,
Since the water-decomposable base material and the water-soluble resin layer are coated on both sides thereof, the leak-proof layer is also provided with the water-decomposable base material and the water-soluble resin layer even when put into water. And smoothly and reliably dispersed in water without impeding the water decomposability of the absorber,
The absorber exhibits excellent water dissolving properties.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One example of an absorbent body for a sanitary pad according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the sanitary pad A is a substantially vertically long plane formed so that liquids such as bodily fluids, blood, and urine can pass therethrough, and the width gradually becomes narrower toward the center. Rectangular surface material 2
And a back surface member 3 having a substantially vertically elongated rectangular shape having the same shape and the same size as the surface material 2 and having a waterproof shape so that liquids such as body fluids, blood, and urine do not flow therethrough. In addition, the absorbers are housed inside a housing 4 formed by integrating the opposing peripheral edges of the front and back members 2 and 3 by heat fusion or an adhesive. The absorbent body 1 of the sanitary pad is used by being housed in the housing body 4 of the sanitary pad A, as shown in FIGS. Are integrally laminated.

The water-decomposable base material 11 constituting the absorber 1 is not particularly limited as long as it is dissolved in water or entangled with each other so that the fibers are separated from each other. For example, a nonwoven fabric made of a water-soluble fiber or a hydrolyzable fiber is used. Examples of the water-soluble fibers or water-disintegrable fibers include, for example, pulp, rayon, cupra, cotton, hemp, wool, silk, polyvinyl alcohol, polyethylene, polypropylene, polyester, nylon, vinylon, and the like. Since the water disintegration of the material 11 is excellent, short cellulosic fibers such as pulp and cotton are preferable.

The water-decomposable substrate 11 may have the water-soluble fibers or the water-decomposable fibers bound together by a water-soluble binder. Such a water-soluble binder is not particularly limited. , Polyvinyl alcohol;
Cellulose derivatives such as methylcellulose and hydroxyethylcellulose; starch; sodium alginate; sodium polyacrylate; The water-decomposability of the water-decomposable substrate 11 is 10
Those having a duration of 0 seconds or less are preferred.

Further, if the basis weight of the water-disintegrable base material 11 is large, it becomes bulky and the wearing feeling of the sanitary pad is reduced.
If it is small, the absorbability of bodily fluids may decrease.
0-300 g / m ² is preferred, and 20-200 g / m ²
Is more preferred.

Next, the synthetic resin constituting the water-soluble resin layer 12 which is integrally and integrally laminated on one surface of the water-decomposable substrate 11 is not particularly limited as long as it is water-soluble.
Examples thereof include polyvinyl alcohol and modified products thereof, polyacrylamide, polyacrylic acid and derivatives thereof, polyethylene oxide, and vinyl ether polymers, and polyvinyl alcohol is preferable.

If the weight per unit area of the water-soluble resin layer 12 is large, the resulting absorbent 1 may have a low water disintegration property, or may have a reduced feeling of wearing a sanitary pad.
Also, when the water-soluble resin layer 12 is small, the water-soluble resin layer 12
Can not be laminated, a part where the water-soluble resin layer is not laminated occurs on a part of the water-disintegratable substrate 11, and the body fluid absorbed in the water-disintegratable substrate 11 due to a decrease in water pressure resistance. May leak out of the water-decomposable base material 11 due to the external pressure applied to the absorber 1, and is preferably 5 to 100 g / m ² ,
~35g / m ² is more preferable.

The surface of the water-soluble resin layer 12 may be matted or embossed to improve the surface slipperiness and to lower the surface tackiness.

The method for integrally laminating the water-soluble resin layer 12 on the water-decomposable substrate 11 is not particularly limited. For example, a water-soluble resin layer is formed on the water-decomposable substrate 11. A method of extruding and laminating a synthetic resin film,
A method in which a synthetic resin film constituting a water-soluble resin layer manufactured in advance is thermally fused onto the water-disintegrable base material 11 with a hot roll or the like is used.

Further, a leak-proof layer 13 may be interposed between the water-decomposable substrate 11 and the water-soluble resin layer 12. As described above, the leak-proof layer 13 is formed of the water-decomposable base material 11 and the water-soluble resin layer.
12 to further improve the water pressure resistance of the absorber 1 so that the bodily fluid absorbed in the absorber 1
It is possible to more reliably prevent an unexpected situation such as leakage to the outside of the absorber 1 due to external pressure applied to the body.

The release agent constituting the leak-proof layer 13 includes
There is no particular limitation, for example, silicone-based release agents such as thermosetting silicone, ultraviolet ray or electron beam curing silicone,
Fluorine-based release agents, long-chain alkyl-based release agents and the like are mentioned, but silicone-based release agents are preferred, and among these, dimethylsiloxane / methylvinylsiloxane copolymer and polymethylhydrogensiloxane are used as platinum catalysts. Silicones obtained by curing by reacting in the presence are more preferred.

The method of interposing the leak-proof layer 13 between the water-decomposable base material 11 and the water-soluble resin layer 12 is not particularly limited. For example, the method of impregnating a brush with the above-described release agent may be used. The water-soluble resin layer 12 is formed by coating on the synthetic resin film forming the water-soluble resin layer 12 or spraying the release agent on the synthetic resin film forming the water-soluble resin layer 12. A release agent is applied in the form of a thin film on a synthetic resin film to be heated, and the release agent is cured by applying heat or irradiating ultraviolet rays or electron beams to form a release agent layer 13, Layer 12 and the release agent layer to form a laminate formed by laminating and unifying, the laminated body on one surface of the water-disintegrable substrate 11 and the leak-proof layer 13 on the water-disintegrable substrate 11 side There is a method of laminating.

A laminate obtained by laminating and integrating the water-soluble resin layer 12 and the leak-proof layer 13 with the water-decomposable base material
11 may be integrated or may be simply superposed so as to be separable. In short, it is only necessary that the leak-proof layer 13 is interposed between the water-decomposable base material 11 and the water-soluble resin layer 12.

The water-soluble resin layer 12 and the leak-proof layer 13
As a method for integrating the laminate obtained by laminating and integrating the water-disintegrable substrate 11 with an adhesive having an adhesive property to both the leak-proof layer 13 and the water-disintegrable substrate 11 A method of integrating the two via the above, the water-soluble resin layer 12 is melted, and the molten water-soluble resin layer 12
There is a method of integrating them into 11. However, when the latter method is adopted, the leak-proof layer 13 is laminated and integrated on a portion of the water-soluble resin layer 12 excluding the outer peripheral edge, and the outer peripheral edge of the exposed water-soluble resin layer 12 is formed. And the water-decomposable substrate 11 are integrated.

If the basis weight of the leak-proof layer 13 is large,
The water-disintegrability of the obtained release sheet is reduced, or the curing of the release agent may be insufficient, and if it is small, the water-disintegrable base material 11 and the water-soluble resin layer 12 Since the leakproof layer 13 cannot be formed uniformly and reliably and the water pressure resistance of the absorber 1 may be reduced, 0.01 to 2.0 g
/ M ² is preferable, and 0.05 to 0.5 g / m ² is more preferable.

The absorbent body 1 of the sanitary pad A constructed as described above is used by being housed in the housing 4 with the water-disintegrable base material 11 facing the surface material 2 of the housing 4. . Thus, the bodily fluid that has passed through the surface material 2 of the sanitary pad A and entered the housing 4 is smoothly and reliably absorbed and held by the water-disintegrable base material 11 of the absorber 1 in the housing 4.

At this time, as described above, since the water-soluble resin layer 12 is integrally laminated on one surface of the water-decomposable base material 11 of the absorber 1, the water-decomposable base material 11 of the absorber 1 is formed. There is no possibility that the bodily fluid absorbed and held inside leaks to the back material 3 side of the housing 4.

In addition, since the water-soluble resin layer 12 is laminated and integrated on one surface of the absorber 1 and its water pressure resistance is improved, when a pressure is applied to the absorber 1 from outside. In this case, the absorber 1 reliably holds the body fluid and does not leak the body fluid absorbed in the absorber 1 to the outside.

Further, when the leak-proof layer 13 is interposed between the water-decomposable substrate 11 and the water-soluble resin layer 12,
The absorber 1 has a more excellent water pressure resistance, and even when a high pressure is applied to the absorber 1, the absorber 1 more reliably retains the absorbed bodily fluid therein.

[0031]

EXAMPLES Example 1 A nonwoven fabric having a basis weight of 70 g / m ² was prepared using pulp as the water-disintegrable fiber, and this nonwoven fabric was used as a water-disintegrable substrate. Next, polyvinyl alcohol (degree of polymerization = 600, degree of saponification = 98 mol%, melting point = 190 ° C.) is extrusion-laminated on the water-disintegrable base material at a basis weight of 15 g / m ² , thereby forming one surface of the water-disintegrable base material. A water-soluble resin layer was integrally laminated on the entire surface to obtain a sanitary pad absorber.

Example 2 A nonwoven fabric having a basis weight of 70 g / m ² was prepared using pulp as the water-decomposable fiber, and this nonwoven fabric was used as a water-decomposable base material. On the other hand, polyvinyl alcohol (degree of polymerization = 600, degree of saponification = 98 mol%, melting point = 190 ° C.)
On the entire surface excluding the outer peripheral edge portion of one surface of the synthetic resin film constituting the water-soluble resin layer having a basis weight 15 g / m ² made of platinum addition type silicone (Shin-Etsu Chemical Co., trade name "K
The S-3705 ") 100 parts by weight of platinum catalyst, 5 parts by weight of the release agent were mixed by stirring, applied with a coating amount of 0.5 g / m ² by solid content, followed by heat to cure Thus, a laminate was formed by laminating and integrating the water-soluble resin layer and the leak-proof layer.
The water-disintegrable base material and the laminate were made to have the same planar shape and the same planar size.

Then, after laminating the water-decomposable base material and the laminate such that the leak-proof layer of the laminate is on the water-decomposable base material side, the water-decomposable base material and the laminate are combined with each other. The outer peripheral edges were integrated by hot pressing to integrate the water-disintegrable base material and the laminate, thereby obtaining an absorbent body for a sanitary pad.

Comparative Example 1 A nonwoven fabric having a basis weight of 70 g / m ² was prepared using pulp as the water-disintegrable fiber, and this nonwoven fabric was used as an absorbent for a sanitary pad.

The water degradability and water pressure resistance of the absorbent of the sanitary pad obtained as described above were measured according to the following methods, and the results are shown in Table 1.

(Water disintegration) A 300 ml beaker containing 300 ml of water at a water temperature of 20 ° C. was placed on a magnetic stirrer, and the rotation speed of the rotor placed in the beaker was adjusted to 600 rpm. I do.

Then, into the above-mentioned beaker, a flat square absorber of 114 mm square was put. At this time, the rotation speed of the rotor is reduced by the resistance of the absorber, but the rotation speed is restored as the absorber breaks down. At this time, the time from when the release sheet was put into the beaker to when the rotor in the beaker recovered to 540 rotations / minute was measured, and the time was regarded as water dissolvability.

(Hydraulic pressure resistance) Measured in accordance with the waterproof test method for textile products according to JIS L1092 A method (low water pressure method).

[0039]

[Table 1]

[0040]

The absorbent for a sanitary pad of the present invention is an absorbent for a sanitary pad which is used by being housed in a housing for a sanitary pad. This absorbent is provided on one surface of a water-decomposable base material with a water-soluble resin. Since the layers are integrally laminated, they have excellent water dissolving properties, and can be disposed of in a toilet or the like for disposal.

Moreover, the absorbent of the sanitary pad has excellent water pressure resistance since the water-soluble resin layer is laminated on one surface of the water-decomposable base material, so that pressure is externally applied to the absorbent. Even in such a case, the absorber does not cause an unexpected situation such that the body fluid absorbed in the absorber is securely held and leaked to the outside.

The absorbent for a sanitary pad according to claim 2 is
The absorbent body for a sanitary pad according to claim 1, wherein a leak-proof layer is interposed between the water-decomposable base material and the water-soluble resin layer, so Therefore, even when a stronger pressure is applied to the absorber, the body fluid absorbed in the absorber can be reliably held and the body fluid can be more reliably prevented from leaking to the outside.

In addition, although the leak-proof layer has water repellency, it is covered with the water-decomposable base material and the water-soluble resin layer on both sides thereof, so that when it is put into water, The leak-proof layer is smoothly and reliably dispersed in water in a state surrounded by the water-decomposable base material and the water-soluble resin layer, and does not hinder the water-decomposability of the absorber, The absorber has excellent water pressure resistance and also exhibits excellent water decomposability.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a sanitary pad using an absorbent body for a sanitary pad of the present invention.

FIG. 2 is a longitudinal sectional view of the sanitary pad of FIG.

FIG. 3 is a longitudinal sectional view showing an absorbent body of the sanitary pad.

[Explanation of symbols]

 1 Absorbent of sanitary pad 11 Water-decomposable base material 12 Water-soluble resin layer 13 Leak-proof layer A Sanitary pad

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B029 BA01 BA12 4C003 AA07 AA12 AA19 CA07 DA08 HA04 4C098 AA09 CC03 CC10 DD05 DD10 DD21 DD23 DD25

Claims (2)

[Claims] 1. An absorbent body for a sanitary pad which is used by being housed in a housing body for the sanitary pad, wherein the absorbent body has a water-soluble resin layer integrally laminated on one surface of a water-decomposable base material. A sanitary pad absorber. 2. The absorbent body for sanitary pads according to claim 1, wherein a leak-proof layer is interposed between the water-disintegrable base material and the water-soluble resin layer.