JPH06185033A - Connection method of cut-off sheet - Google Patents

Abstract

PURPOSE:To connect the ends of two cut-off sheets to each other and cut off completely by using a sheet of super-water absorbing fiber, a stopping device and a sewing thread, and utilizing swelling characteristic of super-wate absorbing fiber. CONSTITUTION:A super-water absorbing fabric sheet 2 is formed of super-water absorbing fiber alone or mixture with the other fiber or lamination with a sheet of the other fiber. After that, the ends of two cut-off sheets 1 are overlapped with each other. Then, the super-water absorbing fabric sheet 2 is held over the overall surface of the overlapped part. Spring water is absorbed, and the super-water absorbing fabric sheet 2 is swelled in several ten times-several thousand times, so that it is made to adhere thereto. In addition, the cut-off sheets 1 are fixed with the stopping device including the super-water absorbing fiber. The cut-off sheets 1 can be sewed with super-water absorbing fabric sewing threads. According to the constitution, the super-water absorbing fiber is swelled, so that the ends of the cut-off sheets 1 can be also completely cut off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining a water-proof sheet joining portion which does not cause water leakage and which utilizes the characteristics of super absorbent fibers.

[0002]

2. Description of the Related Art Conventionally, as a method for joining waterproof sheets,
The following methods are adopted.

A fastener is used. Sew the edges of the seat. Stick with adhesive.

The following methods have been adopted as measures against water leakage at the joint.

The overlapping portion of the sheet ends is lengthened. Sprinkle bentonite on the seams and seal.

However, in the above, water leakage is likely to occur from the gap between the metal fitting and the sheet and the suture portion, and even if it is left, complete adhesion is difficult and there is a high possibility of water leakage.

For this reason, even if the waterproof sheet itself has a high waterproof function, the reliability at the joint is low. In addition, as a measure against water leakage, it cannot be expected to completely stop water.

[0008]

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a simple and complete method for joining water-stop sheet joints, in which water is completely stopped.

[0009]

SUMMARY OF THE INVENTION The present invention is a method for forming a joint between water blocking sheets by stacking the ends of two water blocking sheets with a super absorbent fiber sheet sandwiched therebetween. A method of forming a joint between water-stop sheets by stacking the ends of two water-stop sheets and fastening them with a stopper containing superabsorbent fibers. A method in which the ends of two water blocking sheets are overlapped and sewn with a suture made of super absorbent fiber to form a joint between the water blocking sheets. A method for preventing water leakage from a joint by laying two water blocking sheets on top of each other and laying a super absorbent fiber sheet so as to cover the upper water blocking sheet ends. By performing one or more of the four methods described above, the waterproofing of the waterproof sheet joint is completed.

Although the above four methods may be carried out independently,
It is preferable to use two or more methods in combination in order to further improve the water blocking property. For example, and
And so on.

The super absorbent fiber used in the present invention is, for example, a fiber having an acrylate unit and an acrylamide unit obtained by reacting an acrylonitrile polymer with an aqueous solution of an alkali metal hydroxide, polyvinyl acetate and acryl. Copolymer fibers of vinyl alcohol and acrylate obtained by hydrolyzing a copolymer with acid ester, fibers such as cellulose fibers graft-polymerized with acrylic acid, absorbs clear water, for example, several tens of times ~ A fiber having a property of swelling several thousand times. These super absorbent fibers can be obtained by copolymerizing a crosslinkable monomer such as ethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, N, N'-methylenebisacrylamide, or divinyl ether, or by appropriately crosslinking the fibers. A crosslinking structure may be introduced by crosslinking with an agent, radiation or the like. Further, the super-absorbent fiber may be a single-layer fiber in which the entire fiber has super-absorbency or a multi-layer fiber in which only the outer layer of the fiber has super-absorbency. Examples of commercially available super absorbent fibers include Lanseal-F (registered trademark of Toyobo Co., Ltd.).

Due to their ionic structure, these superabsorbent fibers absorb fresh water and swell to a high degree, but they have the property of contracting by salt water or alkaline aqueous solution. It utilizes the swelling properties of the super absorbent polymer.

In the method (1), the super absorbent fiber is sandwiched between the overlapping portions of two waterproof sheets as a sheet of woven fabric, non-woven fabric, knitted fabric, etc., and absorbs water and adheres to the waterproof sheet. When it is considered that this adhesive strength is insufficient, it is desirable to bond them in advance.

This sheet can be made only from superabsorbent fibers, but other fibers (eg various natural fibers,
It can also be produced by mixing with synthetic fibers, etc.), or can be produced by laminating a sheet made of super-water-absorbent fiber and a sheet made of other fiber or other water-permeable material.

The stopper used in the method (1) and containing the super absorbent fiber is formed by a general method by mixing the moldable synthetic resin with as much super absorbent fiber as possible.

The superabsorbent fiber-made suture thread used in the method (1) is produced by spinning and spinning superabsorbent fiber. This super absorbent fiber suture may be a super absorbent fiber alone or a mixed yarn with other fibers.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

In the method of (2), the ends of the two water blocking sheets are superposed, and the super absorbent fiber sheet is sandwiched between the superposed portions. It is preferable that the super absorbent fiber sheet is sandwiched over the entire overlapping portion.
In the method of (FIG. 1), the ends of two water blocking sheets are superposed, and the superposed portions are fixed with a stopper containing super absorbent fibers. It is preferable that a large number of the stoppers are provided over the entire overlapping portion. (FIG. 2) Furthermore, it is preferable to sandwich the super absorbent fiber sheet over the entire surface of the overlapped portion.

In the method of (2), the ends of the two water blocking sheets are superposed, and the superposed portions are sewn with a suture made of super absorbent fiber. It is preferable that a large number of stitches are applied over the entire overlapping portion. (FIG. 3) Furthermore, it is preferable to sandwich the super-water-absorbent fiber sheet over the entire overlapping portion.

In the method of (2), the ends of the two water blocking sheets are overlapped with each other, and the exposed portions of the ends are covered with the super absorbent fiber sheet. This cover needs to span the entire exposed edge. Depending on the shape of the exposed end portion, it may be covered with a single sheet of super absorbent fiber, but usually, a plurality of sheets of super absorbent fiber are used.
(Figure 4)

[0021]

EFFECTS OF THE INVENTION According to the present invention, due to the characteristics of the super absorbent fiber, the joint of the waterproof sheet is completely waterproofed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a method for sandwiching a super absorbent fiber sheet of the present invention.

FIG. 2 is a vertical cross-sectional view of a method of fixing with a stopper including the super absorbent fiber of the present invention.

FIG. 3 is a vertical cross-sectional view of a method of suturing with a super absorbent fiber suture of the present invention.

FIG. 4 is a vertical cross-sectional view of a method of covering with a super absorbent fiber sheet of the present invention.

[Explanation of symbols]

1 ... Water-stop sheet, 2 ... Super absorbent fiber sheet, 3
... Stoppers containing super-absorbent fiber, 4 ... Sutures made of super-absorbent fiber, 5 ... Super-absorbent fiber sheet

Claims (4)

[Claims] 1. A method for joining water-stop sheets, characterized in that the ends of two water-stop sheets are superposed with a super absorbent fiber sheet interposed therebetween. 2. The end portions of two water blocking sheets are overlapped with each other,
A method for joining water-stop sheets, characterized by fastening with a stopper containing super absorbent fibers 3. The ends of two water blocking sheets are overlapped,
A method for joining waterproof sheets, which comprises suturing with a super absorbent fiber suture 4. The ends of two water blocking sheets are overlapped with each other,
A method of joining water-stop sheets, characterized in that a super-water-absorbent fiber sheet is laid so as to cover the edge of the water-stop sheet on the upper surface.