JPH06198816A - Water absorbing waterproof sheet - Google Patents

Abstract

PURPOSE:To reduce production cost and to enlarge a utilizing range by easily increasing the length and area of a sheet. CONSTITUTION:Heat weldable sheet like surface materials 4, 5 having water permeability on at least one surfaces thereof are provided on both upper and rear surfaces of water absorbable sheets 2 containing a polymeric water absorbent and these upper and lower surface materials 3, 4 are mutually thermally welded and bonded or the water absorbable sheets and the sheet like surface materials are thermally welded and bonded to constitute a water absorbing waterproof sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water absorbent and waterproof sheet containing a polymer absorbent and used for various purposes such as dew condensation absorbent, moisturizing material, waterproof material for water leakage, medical hygiene sheet, and the like.
Particularly, it relates to a long sheet that can be easily formed.

[0002]

2. Description of the Related Art Conventionally, as this type of water absorbent and waterproof sheet,
A water-permeable sheet containing a polymer water-absorbing agent is provided with water-permeable sheets on the upper and lower surfaces, or one surface is provided with a water-permeable sheet and the other surface is provided with a water-impermeable sheet, and the peripheral portions of these are sewn on, and a thin needle is sewn. It is configured with quilting using cotton threads. This sheet, the polymeric absorbent in the water-absorbent sheet absorbs and retains the water that has penetrated into the interior through the water-permeable sheet, and holds the sheet for civil engineering construction, maintenance such as water leakage prevention of the building, a sheet for absorbing dew condensation, or It is considered to be used in various fields such as medical hygiene sheets.

[0003]

However, the above-mentioned conventional products have the following problems. The sheet of the conventional product is designed to prevent the flow of the swollen gel by quilting, but the size of the sheet is at most about 1 square meter in terms of processing, and if it is larger, it takes time to manufacture and the cost becomes higher. Also, during quilting processing, fine needles and fine threads are used to prevent the swelling gel from leaking from the holes of the quilting needles during water absorption, so problems such as needle breakage and thread breakage may occur during sheet manufacturing. There is a problem that the number of needles and threads is increased, it takes time to replace the needles and threads, and the manufacturing cost increases. In addition, after the sheet is quilted, the peripheral portion of the sheet is overlocked or hem processed to prevent the swelling gel from leaking out, but the peripheral portion is costly to process. Furthermore, when the polymer water-absorbing agent swells during water absorption, the water-permeable or water-impermeable sheet material above and below the water-absorbent sheet is pressed, but a sheet material such as a waterproof film has a quilting needle hole due to the pressure of the swelling gel. There is a problem that the material of the covering material is limited, such as being difficult to use because it expands. There is also a problem that it is difficult to use a hard material and a thick material in combination with the water absorbent sheet for quilting.

The present invention has been made in view of the above circumstances, and it is easy to increase the length and area of the sheet, reduce the manufacturing cost, and expand the range of use. The purpose is to provide.

[0005]

The invention according to claim 1 is
In order to solve the above-mentioned problems, on both the upper and lower surfaces of a water-absorbent sheet containing a polymer water-absorbing agent, at least one surface side is provided with a heat-fusible sheet-like covering material, and these upper and lower sheet-like covering materials are provided. The water-absorbent and water-absorbent sheets were joined together by heat-sealing the materials or the water-absorbent sheet and the upper and lower sheet-like facing materials.

[0006] According to a second aspect of the present invention, a large number of water-absorbent sheets containing a polymer water-absorbing agent are arranged at intervals, and thermal fusion bonding having water permeability on at least one of the upper and lower surfaces thereof is performed. Sheet-like outer covering materials are provided, and the upper and lower sheet-like outer covering materials or the water absorbent sheet and the upper and lower sheet-like outer covering materials are heat-fused and joined to each other to form a water-absorbing and waterproof sheet.

Further, as in the third aspect of the invention, the water absorbent sheet may contain at least one of a deodorant, an antibacterial agent, a bactericidal agent and an aromatic agent. Further, as in the invention according to claim 4, a hygienic sheet material containing at least one of a deodorant, an antibacterial agent, a bactericide, and an aromatic agent is superposed on the water absorbent sheet, and the upper and lower surface covering materials are separated from each other. You can place it in Further, as in the invention described in claim 5, a cushioning material may be superposed on the water absorbent sheet, and the cushioning material may be disposed between the upper and lower covering materials.

[0008]

The water-absorbing and waterproof sheet of the present invention is obtained by stacking sheet-like surface covering materials on the upper and lower surfaces of a water-absorbing sheet and bonding them by heat fusion, and quilting and sewing processing of the peripheral portion are provided. Instead, the water-absorbent sheet and the front and back facing materials can be joined to form a sheet, and a long sheet or a large-area sheet can be easily produced. In addition, sewing work is not required, and troubles during manufacturing are extremely small. Further, since there is no needle hole, a covering material such as a synthetic resin film material can be used. Further, it becomes possible to combine a water absorbent sheet with a hard material such as hard paper or a synthetic resin plate.

[0009]

1 shows a first embodiment of a water-absorbing and waterproof sheet according to the present invention, wherein reference numeral 1 is a water-absorbing waterproof sheet, 2 is a water-absorbing sheet, 3 and 4 are surface mounting materials, and 5 is a heat-sealing portion. is there. This water-absorbent and waterproof sheet 1 is formed by superimposing sheet-like facing materials 3, 4 on both upper and lower sides (both front and back sides) of a water-absorbing sheet 2 to form sheet-like facing materials 3, 4 on the front and back sides, or between the water-absorbing sheet 2 and the front and back sides. The heat-sealing portion 5 is formed by heat-sealing the sheet-like outer covering materials 3 and 4, and the water absorbent sheet 2 and the front and rear outer covering materials 3 and 4 are joined to form a sheet.

The water absorbent sheet 2 contains a polymer water absorbing agent,
A sheet material formed by sandwiching a water-permeable base material such as paper, non-woven fabric or cloth is preferably used. The number of the water-absorbent sheets 2 is appropriately set according to the amount of water absorption, and may be one or may be used by laminating a plurality of sheets. As the polymer water-absorbing agent, known polymer water-absorbing agents such as polyacrylate water-absorbing agents can be used, and materials of various shapes such as polymer water-absorbing agent powder, polymer water-absorbing fiber, polymer water-absorbing film, etc. Can be used.

As the sheet-like facing materials 3 and 4 to be joined to the front and back surfaces of the water-absorbent sheet 2, a water-permeable sheet-like facing material 3 is used for both the front and back surfaces, or a water-permeable sheet-like facing material 3 for one of the front and back surfaces. And a non-water-permeable sheet-shaped facing material 4 in combination with the other. As the water-permeable sheet-like surface covering material 3, provided that it is suitable for heat sealing, it is water-permeable and has mechanical strength capable of withstanding the weight of the entire water-absorbing and waterproofing sheet after absorbing water, and at a lower cost. A certain sheet material is preferable, and as such a sheet material, for example, a hydrophilic polypropylene non-woven fabric, a double-layered non-woven fabric with polyethylene which is easily heat-sealed with polyester as a core, and the like are preferably used. The water-impermeable sheet-like surface material 4 is used on the back surface of the waterproof / water-absorbent sheet 1 when waterproofing is required, and is mechanically strong enough to withstand the weight of the sheet when absorbing water, assuming heat sealing. A material having flexibility, flexibility, and low cost is desirable. For example, a polyethylene film or a polypropylene film is preferably used. Considering the incineration process after use, a polyolefin material is preferable.

The heat-sealing portion 5 is formed by heat-sealing the front and back sheet-like fronting materials 3 and 4, or the water absorbent sheet 2 and the front and back sheet-like fronting materials 3 and 4. In this embodiment, the heat-sealing portions 5 are arranged in two rows to prevent movement of the swelling gel and leakage of the swelling gel from the peripheral portion of the sheet. The ear portion 6 formed by the heat seal portion 5 has a certain width so that the water absorbent sheet 1 can be easily adhered and fixed to the use position (side wall surface or ceiling portion), and can be adhered with an adhesive tape or the like. It is desirable to design Further, as shown in FIG. 2, a reinforcing material 7 made of a cloth material or a metal plate having excellent mechanical strength is fixed to a corner portion of the water absorbent sheet 1, and a hole 8 is bored in that portion to absorb water. When the seat 1 is attached to the use position, the hole 8 may be hooked on a hook or the like to be hung.

In this water absorbent and waterproof sheet 1, since the heat seal portions 5 are arranged in two rows, the movement of the swelling gel and the leakage of the swelling gel from the peripheral portion of the sheet can be prevented, and the heat seal portions 5 are arranged in two rows. By cutting, it is possible to appropriately cut and use it at the site where the water absorbent waterproof seal 1 is attached.

In this water-absorbing and waterproof sheet 1, sheet-like facing materials 3 and 4 are superposed on the front and back of the water-absorbing sheet 2, and a predetermined heat-sealing portion 5 such as a peripheral portion of the sheet and a central portion of the water-absorbing sheet is laminated by a heat-sealing machine. Is produced by heat sealing. The width of the water absorbent and waterproof sheet is limited by the sealing width of the heat sealing machine, but the length is not limited, and a long sheet can be easily manufactured. Further, the water absorbent and waterproof sheet 1 can prevent the permeation of water leakage and realize perfect waterproofness by using the water impermeable sheet-like surface mounting material 4. Also, since the sheet is flexible, it can be used for multiple purposes. That is,
It can be installed on a flat surface, hung on the side wall surface or the ceiling, and used by being wound around a drain pipe or a water supply pipe. In order to wind around an object in this manner, it is preferable to use a long sheet having a relatively small sheet width in the form of a winding tape, which can realize excellent workability and ease of use.

FIG. 3 shows a second embodiment of the water absorbent and waterproof sheet of the present invention. Reference numeral 10 is the water absorbent and waterproof sheet. The water-absorbent and waterproof sheet 10 includes a plurality of the water-absorptive sheets 2 arranged vertically and horizontally at intervals, and the heat-fusing sheet-like cover material 3 having water permeability on at least one of the front and back surfaces thereof. , 4 are provided, and the heat-sealing portion 5 in which the front and back sheet-like facing materials 3 and 4 are heat-sealed is formed around each water-absorbent sheet 2 and joined. The heat seal portion 5 is not limited to the peripheral portion, but may be formed by heat-sealing the water absorbent sheet 2 and the front and back sheet-like facing materials 3 and 4 at the central portion of each water absorbent sheet 2. .

The water-absorbing and waterproof sheet 10 according to this embodiment is composed of a plurality of water-absorbent sheets 2 arranged vertically and horizontally, and the sheet-like facing materials 3 and 4 are superposed and heat-sealed on the front and back thereof, so that a large-area sheet is provided. Can be easily manufactured. Further, since the water absorbent sheets 2 are arranged side by side with an interval, by cutting between the heat seal portions 5 formed in two rows,
The sheet can be easily divided, and can be appropriately cut at the installation site to be used as sheets of various sizes.

Incidentally, the water absorbent and waterproof sheets 1 and 1 of these examples
In the case of 0, the water absorbent sheet 2 may contain at least one of a deodorant, an antibacterial agent, a bactericide, and an aromatic agent. Further, a hygienic sheet material containing at least one of a deodorant, an antibacterial agent, a bactericidal agent, and an aromatic agent may be superposed on the water absorbent sheet 2 and placed between the upper and lower covering materials.
Further, a cushioning material may be superposed on the water absorbent sheet 2 and arranged between the upper and lower covering materials. The above deodorant,
As the antibacterial agent, bactericidal agent, and aromatic agent, various known materials and agents can be used. Further, as the sheet material of the hygiene sheet, paper, cloth or the like is used. As the cushion material, a foamed synthetic resin plate, cotton, crushed pulp, corrugated cardboard, or the like is used. Next, a specific example of the water absorbent and waterproof sheet according to the present invention and an application example thereof will be described.

1. Water-absorbent sheet (water-permeable surface material on both front and back sides) (a) Short material As a dehumidifying material and a desiccant, it is used by inserting it into a package when storing or transporting anaerobic industrial products or food products. (B) Short and long items Used as an absorber for water leakage and condensation on the building window side. (C) Long item As a dew condensation absorber, it is used as a dew condensation absorber for covering the upper surface of the package in the container or for building buildings and warehouses. As a moisturizing material and a sustained-release material, water is absorbed in a water absorbent and waterproof sheet and left in the room to moisturize the room. Maintaining indoor humidity prevents dust on the manufacturing floor, warehouses, etc., and suppresses the generation of static electricity. (D) Ultra long object As a dew condensation absorbing material, it is used when the ultra long object is hung from both ends in the container to absorb the dew condensation from the ceiling. Compared with the method of covering the upper surface of each package, the mounting operation becomes easier. This method can also be applied to prevent condensation falling on the ceiling of gymnasiums and warehouses. Also, as a water retention material for agriculture, secure a water retention area in a wasteland or a desertification area and use it for the purpose of desert greening. In addition, soft ground improvement, as a water stop material, dehydration of earth and sand, and a water stop layer is formed on the bottom and side surfaces of an artificial pond.

2. Waterproof sheet (water-permeable sheet on one side,
(The other surface is a waterproof film) (a) As a waterproof sheet for floor water leakage, 1 m x 1 to 3
A sheet of about m is installed and used as it is. (B) For leaking water from a pipe, a short and long sheet is wound around a pipe such as a drain pipe or a water supply pipe. (C) For water leakage of the ceiling and wall surfaces, if the peripheral portion of the waterproof sheet is adhered with an adhesive tape, or a string is hung from a hook hooking hole and hung in a curtain shape, the waterproof sheet is securely fixed. It will prevent the tarpaulin from falling. (D) As a body fluid and blood absorption protective material, it is used as a medical bed underlay, an emergency stretcher underlay, and the like.

3. Functional waterproof sheet A deodorant, an antibacterial agent, a bactericide, an aromatic agent or a cushioning material is inserted in a water absorbent sheet to give it functions other than water absorption and waterproofing. (A) Coffin bedding The mattress has a waterproof film on the back side to prevent dew condensation when using dry ice and leakage of body fluids and blood from the body.
Also, insert crushed pulp and paper to substitute futon cotton. In addition, deodorants and bactericides are added to enhance hygiene. The quilt uses water-permeable sheets on both sides, and inside the quilt, crushed pulp and deodorant are inserted in addition to the water absorbent sheet.

[0021]

As described above, the water-absorbent and waterproof sheet of the present invention is obtained by stacking sheet-like surface covering materials on the upper and lower surfaces of the water-absorbent sheet and bonding them by heat-sealing. The water-absorbent sheet and the front and back facing materials can be joined to form a sheet without providing a sewing process for a portion, and a long sheet or a large-area sheet can be easily produced. In addition, since the sewing process is unnecessary and the occurrence of troubles during manufacturing is extremely small, the manufacturing cost is low. Also, because it is possible to cut the sheet along the heat seal,
It can be cut into a desired size before use. further,
This water-absorbing waterproof sheet is easy to be elongated and has a large area,
In addition, since it can be formed without providing a needle hole, it is possible to use a covering material such as a film material made of synthetic resin, and in addition, it is possible to combine a water absorbent sheet with a hard material such as hard paper or synthetic resin plate. The application range of the water absorbent and waterproof sheet can be expanded.

[Brief description of drawings]

FIG. 1 is a perspective view of a water absorbent and waterproof sheet showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the same water absorbent waterproof sheet.

FIG. 3 is a perspective view of a water absorbent and waterproof sheet showing a second embodiment of the present invention.

[Explanation of symbols]

1, 10 ... Water absorbent sheet, 2 ... Water absorbent sheet, 3,
4 ... Sheet-like surface material, 5 ... Heat seal part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeji Inaoka 1137 Hara, Numazu, Shizuoka

Claims (5)

[Claims] 1. A heat-fusible sheet-like covering material having water permeability on at least one surface side is provided on both upper and lower surfaces of a water-absorbing sheet containing a polymer water-absorbing agent, and these upper and lower sheet-like covering materials are provided. A water-absorptive and waterproof sheet, characterized in that the water-absorptive sheet and the upper and lower sheet-like facing materials are heat-sealed and joined. 2. A large number of water-absorbent sheets containing a polymeric water-absorbing agent are arranged at intervals, and a heat-fusible sheet-like cover material having water permeability is provided on at least one surface side on the upper and lower surfaces thereof. A water-absorbing and waterproof sheet, characterized in that the upper and lower sheet-like facing materials or the water-absorbent sheet and the upper and lower sheet-like facing materials are heat-fused and joined. 3. The deodorant, antibacterial agent,
The water absorbent and waterproof sheet according to claim 1 or 2, comprising at least one of a bactericide and an aromatic agent. 4. The deodorant, antibacterial agent,
The hygroscopic sheet material containing at least one of a bactericidal agent and an aromatic agent is superposed and disposed between the upper and lower facing materials, and the water absorbent and waterproof sheet according to claim 1 or 2. 5. The water-absorbing and waterproof sheet according to claim 1, wherein a cushioning material is superposed on the water-absorbing sheet and is arranged between the upper and lower cover materials.