JP2525230Y2 - Liquid disintegratable absorbent articles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-disintegratable absorbent article which is easily dissociated and dispersed when put into water.

[0002]

2. Description of the Related Art For example, a panty liner, which is a kind of absorbent article, is mainly used outside the period of menstruation unlike a sanitary napkin, and the number of sheets used per day is two to two.
About three sheets are often used for a longer time than napkins. Therefore, the surface material of the panty liner is required to have flexibility and wet strength enough to withstand long-term use even when wetted with body fluids. For this reason, in general, as the nonwoven fabric constituting the surface material, a material obtained by joining and integrating a fiber material with a heat-meltable fiber or a water-insoluble binder or the like is used. Other materials such as agents are also made of non-dispersible and water-insoluble materials.

An important problem that must be solved when using the above-mentioned panty liner or hemorrhoid pad is how to easily and cleanly dispose of it after use. If it can be flowed to the surface, the treatment can be performed easily and hygienically, which is very convenient. Particularly, in the case of a hemorrhoid pad used by men, since a male toilet does not always have a filth container like a female toilet, a method of flushing the toilet is very effective.

However, conventional absorbent articles such as pantiliners and hemorrhoid pads are not configured to disintegrate in water as described above. Therefore, when they are discarded in a flush toilet, they remain in their original shape forever. Subsequently, the sewer pipe will be blocked, and the function of the simple septic tank will be hindered.

For this reason, materials that can be rapidly dispersed in water have been studied.
No. 39845 discloses polyvinyl alcohol (hereinafter referred to as P
The use of water-decomposable rayon paper with VA as a binder as a wrapping material (surface material) for sanitary treatment products is disclosed.

[0006] However, the rayon paper has the property of being dispersed when washed with water, but has a low strength when wet with body fluid, and has a good texture like a surface material made of a conventional water-insoluble nonwoven fabric. Do not have
Physiological treatment articles using the same have the drawbacks of low durability when wet and poor usability.

On the other hand, in the case of sanitary napkins, a so-called “flowable napkin” using the water-disintegrable surface material is commercially available, and individual constituent members other than the surface material are easily dissociated and dispersed in water. Is formed by

However, the above-mentioned conventional sanitary napkin is
As shown in FIGS. 3 (A) and 3 (B), a leakage preventive material 2 is provided from the back surface of the absorber 1 to both side and upper end portions of the absorber 1, and the absorber 1 and the leak preventive material 2 are placed on the front surface. Since it is completely wrapped by the material 3 and the lengthwise end portions 4 and 4 are sealed over the entire width, even if it is put into water, the surface material takes on a bag-like shape because the surface material has a bag shape. Of the napkin is hard to sink while the napkin is floating. For this reason, there is a disadvantage that it takes time to disintegrate the napkin.

[0009]

[Problems to be Solved by the Invention] The problem of the present invention is that the texture is good and the feeling of use is superior, and it also has the durability not to be deformed and the large wet strength. It is an object of the present invention to provide a liquid disintegratable absorbent article that dissociates, disperses, and disintegrates.

[0010]

Means for Solving the Problems In order to solve the above problems, the absorbent article of the present invention has a liquid absorbing property and its integrity does not collapse even when it comes in contact with a normal amount of body fluid, Liquid-disintegrating absorber that dissociates and disperses on contact with liquid; has liquid permeability, does not show disintegration when contacted with high salt concentration liquid, but disintegrates with low salt concentration liquid A liquid-disintegrable leakproof material which is liquid-impermeable and does not disintegrate when it comes in contact with a normal amount of body fluid, but dissolves or disperses when it comes in contact with a large amount of liquid. A liquid-disintegrable backing material that has liquid permeability and does not break down when contacted with a normal amount of body fluid, but dissociates and disperses when contacted with a large amount of liquid; Overlay the leaking material and apply it from the surface of the polymer to the left and right side edges excluding the center of the leakproof material on the back. The surface material as well as the setting, the back sheet to be set on the back surface of the polymer, these surface materials, absorbent,
The leak-proof material and the back surface material are further integrated by using a water-soluble binder and further by partial thermocompression bonding.

[0011]

Since the surface material is made of non-woven fabric, the absorptive article has a good feel and excels in sensation of use. In addition, the components are integrated by thermocompression bonding, and a normal amount of Since the integrity of the body fluid is not broken down to the extent that the body fluid is absorbed, the body fluid is hardly deformed during use and the strength when wet is large.

On the other hand, if the used absorbent article is discarded in water, it is quickly immersed into the inside and each component comes into contact with a large amount of liquid, so that each member dissociates and disperses immediately and collapses.

[0013]

1 and 2 show one embodiment of an absorbent article according to the present invention. This absorbent article has a liquid-impermeable structure on the back surface of an absorbent body 10 which is superior in absorbing body fluid. A leak-proof material 11 is superposed, and a liquid-permeable surface material 12 is provided from the surface of the polymer to both right and left ends of the back surface excluding the central portion of the leak-proof material. The backing material 13 is disposed, and the backing material 13 is bonded to the leak-proof material 11 and the surface material 12 with a water-soluble adhesive 14, and then partially thermocompression-bonded from the front side to the back side ( By embossing, the surface material 12, the absorber 10, the leak-proof material 11, and the back material 13 are integrated by the bonding force at each thermocompression bonding portion 15.

Therefore, at both ends in the longitudinal direction of the absorbent article, the constituent members are free from each other without being integrated by a seal, but the members are unnecessarily separated during use. In order to prevent this, as shown in FIG. 1, it is preferable that the thermocompression-bonding portions 15 are respectively applied to about two places at both end edges.

The thermocompression bonding may be performed in a dot shape as shown in FIG. 1 or in a stripe shape, and when thermocompression bonding is performed, in the case of FIG. Although the front side is largely depressed by pressing from the side to the back side, both sides may be largely depressed by pressing from both the front and back sides. In the case of thermocompression bonding in a dot shape, the shape of the thermocompression bonding section 15 is not limited to a circular shape as shown in the figure, but may be an arbitrary shape in consideration of decorativeness such as a floral pattern.

The absorber 10 is formed by integrating pulp into a mat or a sheet with a water-soluble binder such as PVA. Does not collapse, but upon contact with a large amount of liquid (regardless of salt concentration), the binder dissolves, disrupts its structural integrity, and easily dissociates and separates into water.

The basis weight of the absorber 10 is 40 to 150 g /
m ² is preferred, and more preferably 50 to 100 g / m ^2.
It is. The absorbent body 10 is a material used for ordinary absorbent articles such as cotton-like pulp and absorbent polymer material, and has a structure when it comes in contact with a large amount of water (regardless of its salt concentration). A material that easily dissociates and disperses in water due to disintegration of the target can be used as appropriate.

The surface material 12 maintains its structural integrity without collapsing even when it comes into contact with body fluid having a high salt concentration such as blood, menstrual blood, urine, vaginal discharge, etc.
Maintains satisfactory mechanical strength in use, but when it comes in contact with a large amount of liquid with low salt concentration, its structural integrity is broken down and it easily dissociates and disperses in liquid. It is composed of a nonwoven fabric.

This nonwoven fabric is composed of a water-dispersible fiber layer that disperses when it comes into contact with a liquid. The water-dispersible fiber layer is formed of an unsaturated carboxylic acid component formed of a neutralized salt. It is linked by a water-soluble binder containing a saturated carboxylic acid / unsaturated carboxylic acid ester copolymer as a main component (see Japanese Patent Application No. 2-178826). The fiber layer is composed of a mixture of crimped fibers having a fiber length of 30 mm or less, and the content of crimped fibers having a number of crimps of 19 / inch or less in the mixture is 40 to 90% by weight; 20-25
The content of the crimped fiber having the number of crimped fibers of 10 to 60% by weight and the number of crimps having the number of crimps of 26 to 30 per inch is 10% by weight.
%, And the binder content in the nonwoven fabric is preferably 0.1 to 10% by weight. In addition,
The binder and the non-woven fabric are all proposed by the present applicant.

The leak-proof material 11 provided on the back of the absorber 10 is made of a sheet or film impermeable to body fluid.
When it comes in contact with a large amount of liquid (regardless of salt concentration), it is easily dissolved or dispersed in the liquid.

Further, the backing material 13 is composed of a liquid-disintegrating nonwoven fabric which, when it comes into contact with a large amount of water (regardless of salt concentration), loses its structural integrity and is easily dissociated and dispersed in a liquid. Have been. Desirably, the backing material 13 is provided with a shift preventing function by applying an adhesive material 17 or the like. In this case, a release paper 18 is stuck on the adhesive material 17. The adhesive 17 and the release paper 18 are preferably water-soluble or water-dispersible.

The absorbent article having the above-described structure is a surface material 1
2 is made of non-woven fabric, so it has a good texture and excels in usability. In addition, each component is integrated by thermocompression bonding, and its integrity is reduced to the extent that it absorbs a normal amount of body fluid. Since it is configured not to collapse, it is hardly deformed during use and has high strength when wet.

On the other hand, when the used absorbent article is discarded in water, the surface material 12 does not completely cover the absorber 10 and the leak-proof material 11 but covers the portion except for the center of the back surface. It is provided, and both ends in the longitudinal direction of the absorbent article are kept in a free state without being sealed, so that the inside of the absorbent article is extremely quickly immersed and a large amount of each constituent member is formed. Upon contact with the liquid, it dissociates and disperses immediately.

<< Experimental Example >> Next, a performance experiment of the present invention will be described. As a sample of the product of the present invention, a panty liner having the configuration shown in FIGS. 1 and 2 was prepared from the following materials. In this case, a 7 mm-sized flower pattern was formed on the thermocompression-bonded portion, and a water-soluble adhesive was applied to the back surface material. Absorbent: A material obtained by adding 20% of PVA as a binder to pulp and integrating them in a mat shape, and having a basis weight of about 70 g /
of those m ^2. Leak-proof material: PVA film having blood leakage prevention properties. Surface material: A water-disintegratable nonwoven fabric containing an aqueous solution binder containing acrylic acid / cyclohexyl acrylate (neutralization ratio 43%) as a main component. Back material: a water-disintegratable wet nonwoven fabric containing 8% of PVA as a binder. Binder: A water-dispersible emulsion containing an acrylic copolymer resin as a main component is coated on the back surface in a stripe shape with a width of 2 mm.
Book coating. Adhesive: A water-dispersible emulsion containing an acrylic copolymer resin as a main component is applied in a stripe shape (6 mm width × 100 mm length × 3 lines).

With respect to the sample obtained as described above,
The disintegration and usability were evaluated by the following methods. (1) Disintegration Based on "Environmental Education Center of Japan," Washability test method for sanitary treatment products 2. General rules (2) Degradability test Disintegration test, air stirring method ". (2) Usability: Usability test using human body model After attaching a test sample to a human body model and dropping 1 ml of the test solution, walking action was performed at a speed of 100 m / min for 60 minutes.
The deformation rate was determined by the following method. P: Horizontal projected area of absorber layer before test S: Horizontal projected area of absorber layer after test

As a comparative example, a sample having the following structure was prepared and evaluated in the same manner. Table 1 shows the experimental results.
Shown in <Comparative Example 1>: Made of the same material as the product of the present invention,
Those without floral embossing. << Refer to FIG. 4 (A) and FIG. 4 (B) >><Comparative Example 2>: Made of the same material as the product of the present invention,
A flower pattern embossed and sealed at both ends in the length direction. << See FIGS. 5 (A) and 5 (B) >><Comparative Example 3>: Made of the same material as the product of the present invention,
Sealed at both ends in the length direction without embossing the flower pattern. << See FIGS. 6 (A) and 6 (B) >><Comparative Example 4>: Covering the absorber and leak-proof material as a whole with a surface material and sealing both ends in the length direction (cotton wrapping type) ). << Refer to FIG. 3 (A) and FIG. 3 (B) >><Comparative Example 5>: A leakproof material that covers the used surface side of the absorber with a surface material and is liquid-impermeable on the non-used surface side of the absorber. The surface material and the leak-proof material are thermocompressed or fixed by press-fitting with an adhesive (absorbing body inclusion / punched type). {See FIGS. 7 (A) and 7 (B)}

As can be seen from the above results, the product of the present invention
Since the surface material 12 is highly integrated with the absorber 10 and the leak preventer 11, the deformation during use is small and the usability is good, and the surface material 12 is locally embossed to give a use surface. By combining the absorber with the absorber 10, separation between the materials is less likely to occur than in the case where both ends are completely sealed (tab seal), and good usability is maintained. In addition, since both ends are open, the disintegration property when poured into water is extremely good.

On the other hand, in Comparative Example 1, although both ends are open, the disintegration property is good, but the surface material is released from the absorbent body because it is not embossed, and uncomfortable feeling during use. Is inferior in usability. Comparative Example 2
In addition to embossing, tab seals are applied to both ends, so that deformation during use can be suppressed, but it is inferior in disintegration when released into water. In Comparative Example 3, since the embossing was not performed, the surface material was easily released from the absorber during use, and the tab seal prevented the disintegration. In the configuration of Comparative Example 4, since the surface material is in the shape of a bag, it floats up when released into water and is hardly immersed in water, so that it is inferior in disintegration. In the configuration of Comparative Example 5, although the disintegration property was good, the degree of liberation of the absorber between the surface material and the leakproof material was high, so that the absorber was greatly deformed by moisture and external force during use, and There is a sense of discomfort inside and the usability (feel of use) is quite poor.

[0029]

[Table 1]

[0030]

As described in detail above, the absorbent article of the present invention has a good texture, excels in feeling of use, and has a large wet strength at the time of use to such an extent that it does not collapse even if it absorbs a normal amount of body fluid. When discarded in water after use, each component immediately dissociates and disperses due to rapid inundation, and therefore can be discarded in a flush toilet, such as a panty liner, a hemorrhoid pad, etc. Can be used advantageously.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of an absorbent article.

FIG. 2 is an enlarged sectional view taken along the line AA in FIG.

FIG. 3 is a plan view and a sectional view of a conventional absorbent article.

FIG. 4 is a plan view and a cross-sectional view of an absorbent article as a comparative example.

FIG. 5 is a plan view and a cross-sectional view of an absorbent article as a comparative example.

FIG. 6 is a plan view and a cross-sectional view of an absorbent article as a comparative example.

FIG. 7 is a plan view and a cross-sectional view of an absorbent article as a comparative example.

[Description of sign]

 DESCRIPTION OF SYMBOLS 10 Absorber 11 Leak-proof material 12 Surface material 13 Back material

Claims (1)

(57) [Scope of request for utility model registration] 1. A liquid-disintegrating absorber which has a liquid absorbing property and does not disintegrate when it comes into contact with a normal amount of body fluid, but dissociates and disperses when it comes into contact with a large amount of liquid; However, it does not show disintegration even when it comes in contact with a salt-rich liquid, but has a liquid-impermeable surface material made of a liquid-disintegratable nonwoven fabric showing disintegration for a salt-low liquid. Liquid disintegrating leak-proof material that does not disintegrate when in contact with normal amount of body fluid, but dissolves or disperses when in contact with a large amount of liquid; has liquid permeability and can be integrated with normal amount of body fluid Does not collapse, but disintegrates and disperses on contact with a large amount of liquid. Liquid-disintegrable backing material; A surface material is provided on both left and right ends excluding the center portion, and a back material is provided on the back surface of the polymer. A liquid-disintegratable absorbent article, wherein a surface material, an absorber, a leak-proof material, and a back surface material are further integrated by using a water-soluble binder and further partially by thermocompression bonding.