JPH06245956A - Water collapsible hygienic material - Google Patents

Abstract

PURPOSE:To add the characteristic of water collapsibility in addition to functions as hygienic materials, such as hygienic bands and paper diapers, which have heretofore been not chargeable and releasable into toilets after use for absorption of the menstrual blood, urination, defecation, etc. CONSTITUTION:This water collapsible hygienic material is formed by providing the surface, in contact with the body, of an absorptive sheet consisting of water collapsible pulp or consisting essentially of this pulp with hydrophobic dotty, grid-like or linear printing and subjecting the surface on the opposite side of this absorptive sheet to printing or coating of substantially continuous films of polyethylene oxide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a function as a sanitary material such as a sanitary band, a disposable diaper, etc., which cannot be put into and discharged from a toilet after absorption of menstrual blood, urination, defecation, etc. In addition, the present invention relates to a new sanitary material such as a new sanitary belt and a disposable diaper that can be added with water-disintegrating characteristics.

[0002]

2. Description of the Related Art As a basic structure common to sanitary materials such as sanitary belts and disposable diapers, pulp or an absorbent layer containing pulp as a main component is placed on a polyethylene film having a thickness of about 20 microns and polyethylene or Structures have been employed in which porous sheets of fibers of other polymers are stacked. When the above-mentioned structure is adopted, since it is a non-disintegrating material provided above and below water, even if the intermediate absorbent layer is a water-disintegrating material such as pulp, sanitary materials such as sanitary belts, disposable diapers, etc. As a whole, it is non-disintegrating in water and cannot be put into a toilet or discharged after use. Therefore, under the present circumstances, sanitary materials including menstrual blood, urine, stool, etc. are disposed of together with general household waste, which is becoming a major environmental sanitation problem.

[0003]

As described above, in order to maintain the sensation of the surface in contact with the body, the permeation performance for menstrual blood and urine, and the leakproof performance, a non-disintegrating porous material for water as described above. Disposal of sanitary materials using sheets and films has become a major social problem. Therefore, it is desired to develop a sanitary material which is water-disintegrating at the time of disposal, while maintaining the conventional function, which can replace the existing sanitary material having a harmful effect on the environment.

[0004]

SUMMARY OF THE INVENTION The present invention stops the use of non-disintegrating materials used for maintaining the functions of existing sanitary materials such as sanitary belts and disposable diapers, and achieves the same function. It uses an inexpensive system which has water-disintegration under certain conditions and which is superior in production efficiency to existing products. That is, as described above, existing sanitary belts, sanitary materials such as disposable diapers use a porous sheet on the surface in contact with the body, and a leakproof film on the opposite surface. However, since these materials are non-disintegrating to water, it becomes impossible to put them into a toilet after use and to release them. Therefore, in the present invention, at the time of use, in a condition where the amount of water is small, it has water resistance to withstand use, and when it is put into a toilet with a large amount of water, it is disintegrated into water and discharged, so that a hydrophobic polymer is used. With the printing ink as a raw material, on the surface that comes into contact with the body,
A halftone dot, lattice or linear discontinuous film that can absorb water is printed, and the opposite side, which is required to be leak-proof, is mainly made of continuous polyethylene oxide. Print or paint the film. As the polyethylene oxide, it is desirable to use one having an average molecular weight of about 10 to 5,000,000. Polyethylene oxide is a relatively inexpensive material, is a safe polymer that is completely soluble in water and soluble in common organic solvents such as alcohols, esters, ketones, halogenated hydrocarbons and glycols. However, since the dissolution rate in water is very slow, satisfactory results can be obtained in leakproofness when printing or painting in a continuous film as described above.
Since it takes time to disintegrate in water, the disintegration rate in water can be promoted by adding glycerin or polyethylene glycol having an average molecular weight of 1000 or less as a plasticizer. Further, if necessary, a super absorbent polymer may be mixed to further improve the water absorbing ability. As the printing method, gravure printing, flexo printing,
Each method such as silk screen printing can be adopted, and each method such as gravure coating and roll coating can be adopted as a coating method. It should be noted that since existing physiological belts and disposable diapers usually use a film or porous sheet of 20 to 100 microns, the thickness of the printing or coating film can be determined based on these values. The surface that comes into contact with the body should avoid contact with the absorbent layer that has absorbed water, and a dry and soft feel is desired.Therefore, use a foaming ink that foams into a sponge, if necessary, in the form of dots, grids or It is desirable to print linearly. In addition, it is common that the print pattern is almost uniform, but it is not always necessary to average it, and it is possible to give changes such as high density in a certain part, and further The thickness of the line may be changed. In the production of existing sanitary materials such as sanitary belts and disposable diapers, a method is used in which a non-disintegrating porous layer and an absorptive layer are superposed on water and heat-bonded to each other. In the invention, a very simple method of performing printing or coating on both surfaces of the absorbent layer and performing heat drying is sufficient, and further, foaming,
There is an advantage that coloring and printing of a product name can be performed at the same time, and a large reduction in manufacturing cost can be expected. As the main absorbent layer (absorbent sheet), it is preferable to use pulp or a sheet containing pulp as a main component and dispersing polyethylene oxide having an average molecular weight of 100,000 to 5,000,000 as a water-soluble hot melt adhesive. It is a sheet formed by adding polyethylene oxide as a water-solubilizing agent for maintaining the shape. On the surface of this pulp sheet that comes into contact with the body, dot printing, grid-like or linear printing is performed with a hydrophobic printing ink. During use, this hydrophobic printing surface comes into contact with the body and Made to absorb menstrual blood and urine. Further, the sanitary material of the present invention comprises a printing layer / absorbent sheet / printing or coating layer, and if necessary, a pressure-sensitive adhesive layer / releasing silicone layer / water disintegrating paper on the surface of the printing or coating layer. May be stacked. For example, water-disintegratable paper (pulp / polyvinyl alcohol = 95/5) coated with release silicone can be used. In use, the hygiene material of the present invention processed as described above has a dry touch feeling because the body-contacting portion is a hydrophobic dot-like, grid-like or linear printing surface. , The liquid passes through the non-printing surface and is absorbed by the absorbing layer. The absorbed liquid is prevented from permeating from the absorbent layer to the outside in a printing or coating layer of a continuous film which is superposed, and exhibits a leakproof effect.
However, after use, the sanitary material of the present invention easily disintegrates in water when it is discarded, so that it can be put into a toilet and discharged. In addition, when cutting the laminated materials into the required shape as described above and heating the periphery along the shape, the polyethylene oxide of the water-soluble polymer added inside the material is water-soluble hot melt adhesive. It can act as an agent and maintain its form. INDUSTRIAL APPLICABILITY The present invention can employ gravure printing, flexographic printing, and silk screen printing as printing methods, and is superior in production efficiency to conventional production methods, and in terms of the environment, solves social problems regarding disposal. It is intended to provide a system capable of.

[0005]

The present invention will be described in detail with reference to the following examples.
It goes without saying that the present invention is not limited to these examples.

Example 1 A silk screen ink consisting of 5 parts by weight of zeolite, 5 parts by weight of strong oxidative polymerization and 90 parts by weight of 8-nylon varnish was used as a pulp sheet (pulp / polyvinyl alcohol = 95 /
5 and a thickness of about 2 mm) are printed on one side with halftone dots and grids as shown in FIGS. 1 and 2, respectively, and on the other side, 5 parts by weight of polyethylene oxide having an average molecular weight of 200,000 and an average molecular weight of A continuous film was printed with a silk screen ink composed of 5 parts by weight of 400 polyethylene glycol and 90 parts by weight of ethanol. The sheet (FIG. 3) obtained here was cut, the physiological band was adjusted, and the sheet was subjected to a practical test.
It should be noted that in FIG. 3, the layers are shown separated for easy understanding, but they are in contact with each other in practical use. The menstrual band of the present invention showed the same menstrual blood absorption and leakage prevention properties as those of existing products, an excellent deodorizing effect, and water resistance and feel during use. Furthermore, it was disintegrated in the water in the toilet and could be discharged. Example 2 In Example 1, the same printing as in Example 1 was performed using a pulp sheet having a thickness of 5 mm instead of the pulp sheet having a thickness of 2 mm, and the paper diaper was cut to prepare a practical diaper. did. The paper diaper of the present invention exhibited the same urine absorption performance, leak prevention performance, excellent deodorization performance, water resistance during use, and feel as with existing products. Furthermore, it collapsed in the water in the toilet and could be discharged.

[Brief description of drawings]

1 and

FIG. 2 is a plan view showing an embodiment of a printing layer of the present invention.

FIG. 3 is a schematic sectional view showing the constitution of the sanitary material of the present invention. Reference numerals in the drawing indicate 1-printing layer, 2-water absorbing sheet, 3-printing or coating layer, respectively.

(72) Inventor Shiro Kojima 2-33-1 Kyobashi, Chuo-ku, Tokyo Toyo Inki Manufacturing Co., Ltd. (72) Inventor Fumio Tateshima 2-3-3 Kyobashi, Chuo-ku, Tokyo Toyo Inki Manufacturing Co., Ltd. (72) Inventor Mitsuru Endo 6-5-19 Shimooda, Nakahara-ku, Kawasaki-shi, Kanagawa

Claims (3)

[Claims] 1. A sanitary material having an absorbent sheet such as a menstrual band or a disposable diaper, wherein hydrophobic dot-shaped, lattice-shaped or linear discontinuous film printing is performed on a water-disintegratable pulp or It is provided on the body-contacting surface of the absorbent sheet mainly composed of pulp, and the opposite surface of the absorbent sheet is printed or painted with a substantially continuous film mainly composed of polyethylene oxide. Characteristic water-disintegrating sanitary material. 2. The water-disintegrating sanitary material according to claim 1, which is a printing or painting of a substantially continuous film containing polyethylene oxide and further glycerin. 3. A printing or coating of a substantially continuous film containing polyethylene oxide and polyethylene glycol having an average molecular weight of 1,000 or less.
Or the water-disintegrating sanitary material described in 2.