JP2003053843A - Sheet material bonding method and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that pressure must be applied at the time of bonding of cut-off sheets in the case of pressure bonding due to self-melting in spite of relatively low pressure, but wrinkles are easily generated in the bonded part because of low pressure and the cut-off property or airtightness of the bonded part is obstructed because the cut-off sheets are bonded in such a state that wrinkles are left. SOLUTION: At least two rows of bonding tapes are arranged to the superposed part to be bonded of sheet materials so as to form a gap between the tapes and air is drawn in the gap to mutually draw the sheet materials at the part to be bonded and the sheet materials are thermally fusion-bonded in this state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for joining sheet materials for forming a large sheet such as a silt fence or an oil fence covering a vast area such as a waste disposal site or a tunnel. Regarding

[0002]

2. Description of the Related Art A sheet covering a vast area cannot have a desired size unless a plurality of sheet materials of a size produced in a factory are joined. Therefore, as a means for further connecting on-site sheet materials that have been previously connected at the factory, it is common to use a sheet material made of a thermoplastic resin by melting the connection portion with heat or high frequency and pressure bonding.

In the case of a rubber sheet material, in the case of vulcanized rubber, vulcanized rubber is bonded by vulcanization by sandwiching the unvulcanized rubber between the sheet material connection points and applying heat and pressure. In addition, the thermoplastic rubber is pressure-bonded after being brought into a molten state by heat and heat. Further, as a means applicable to a sheet material of any material, there is a method of connecting a connection portion to the sheet material with an adhesive material.

[0004]

However, in the case of pressure bonding by self-melting, although the pressure is relatively low, it is necessary to load the pressure. In this case, since the pressure is low, wrinkles are likely to occur in the adhesive portion, and the wrinkles are bonded in a state where the wrinkles remain, so that there is a problem that the wrinkles hinder the waterproofness and airtightness.

When the sheet material is rubber, high pressure is required for vulcanization and adhesion, so that the apparatus becomes large in size, and a strong foundation and levelness for supporting the reaction force against it are required. There is a problem that large-scale pre-construction is required for that purpose.

[0006]

The cause of leakage at the joint portion of such sheet materials depends on whether or not the contact state during joining is perfect. Therefore, in the case of heat fusion that requires supply of thermal energy to the joining, it is required to obtain a state in which this close contact is maintained.

Therefore, according to the present invention, at least two rows of joining tapes are arranged in the joining portion where the sheet materials are overlapped, a gap is formed between the tapes, and the air in the gap is sucked to suck the sheet material at the joining portion. A method for joining sheet materials, in which the joining portions of the sheet materials are joined by heat fusion in a state in which the two members are pulled close to each other, and further, an opening having a width that can sufficiently cover the width of the joining portion of the sheet materials is provided. Shaped heat circulation container,
A sheet material joining device comprising a heat supply device connectable to the heat circulation container by a circulation pipe and a pressure reducing device connectable to a gap between the joining tape rows by an intake pipe.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, a case where rubber sheets are joined by heat fusion will be described. FIG. 1 is an explanatory diagram of a heat fusion device, and FIG. 2 is an explanatory diagram showing a seal structure example.
In the figure, 1 is a sheet material, and 2 is a joining portion of the sheet materials.

The joint portion 2 is composed of a joint tape 3 for heat-sealing sheet materials, and a joint tape (similar to the joint tape 3 on both sides or one side of the joint tape 3 in this embodiment, with a gap 4 therebetween). Adhesive tape is also included.) 3 is arranged. It is not always necessary to form the gaps 4 on both sides, but it is necessary to form at least one gap 4, and it is needless to say that it may be more.

Reference numeral 5 is a heat circulation container. The heat circulation container 5 is not limited to a quadrangular cross-sectional shape as shown in the drawing, but is a three-dimensional container having any shape such as a triangular shape or an arc shape.
It has a width sufficient to cover the width of the joint portion 2 of the sheet material 1, and has an opening 6 for holding the joint portion 2 of the sheet material 1 over a predetermined length. The shape of the heat circulation container 5 is not limited to the rectangular parallelepiped shape shown in the figure,
It may be oval, elliptical or any other shape, and may be any shape as long as it fits the joint.

As described above, the heat circulation container 5 is placed with its opening 6 facing the joint portion of the sheet material 1. A heat supply device 7 is connected to the heat circulation container 5 by a circulation pipe 8 to circulate hot air into the heat circulation container 5. Reference numeral 9 denotes a decompression device such as a vacuum pump or an aspirator, which draws the sheet materials 1 together by decompressing the inside of the gap 4 formed by the joining tape 3 of the joining portion 2 and the adhesive tape 3 by the intake pipe 10.

The operation will be described below when a rubber sheet is used as the sheet material. As shown in FIG. 3, on the joint portion 2 of the pre-vulcanized rubber sheet 1 spread on a plane, a joint tape 3 made of a band-shaped heat-sealing rubber tape or the like having the same kind of composition or excellent adhesiveness is used. The bonding tapes 3 or the adhesive tapes 3 are arranged at intervals on one side or both sides thereof to form the gap 4, and the gap 4 is formed. In this case, the rubber sheet 1 is placed on a flat surface without wrinkling. Next, the joining portion of the other rubber sheet 1 is superposed on the joining tape 3 for heat fusion, and is placed so that the whole becomes flat as shown in FIG.

The joining tape 3 made of a heat-fusible rubber tape or the like may have any shape, and may have a desired cross-sectional shape as shown in FIG.
In the case of a wide shape in which the gap is formed, the gap 4 can be formed by the recess only with the one joining tape 3, and it is not necessary to arrange other tapes. It should be noted that if through holes are formed in the thin portion at a predetermined interval, the upper and lower dents communicate with each other, which is favorable for inhalation described later.

As shown in FIG. 6, the heat circulation container 5 is placed on the joint portion 2 of the rubber sheet 1 thus constructed through the sealing structure of the opening, and the inside of the heat circulation container 5 is sealed. To do. Therefore, the decompression device 9 is connected to the joint 2 via the intake pipe 10.
Gap 4 formed by the joining tape 3 and the adhesive tape 3 of
Then, the pressure reducing device 9 is operated to reduce the pressure in the gap 4 so that the sheet materials 1 are attracted to each other. The depressurized state may be about -300 mmHg, and it is not always necessary to make a complete vacuum state. As a result, the joining portion 2 may bring the sheet materials in the gap 4 between the joining tapes 3 into contact with each other.

While maintaining this reduced pressure state, the heat supply device 7 is circulated and supplied to the heat circulation container 5 connected through the circulation pipe 8 while heat exchange of hot air of about 140 to 160 ° C. Then, the vulcanization reaction of the joining tape 3 proceeds to bring the joining portions 2 of both rubber sheets 1 into close contact with each other. Incidentally, at the time of heating,
A heat insulating material is arranged on the back side of the rubber sheet 1 or the heat supply device 7
The heating time can be shortened by using a heat insulating material for the circulation pipe 8.

After the joint portion 2 of the rubber sheet 1 is brought into close contact with each other in this manner, the depressurized state is released. So further,
The pressure can be reduced again, and the leak of the joint portion 2 can be inspected. In this way, by joining the joining portions 2 of the rubber sheet successively and sequentially, as shown in FIG. 7, it is possible to join the entire length of the joining portion 2. In the above description, the case of the rubber tape joined by heat fusion has been described, but in the case of a thermoplastic sheet material, the sheet materials can be directly adhered to each other. Therefore, any sheet material may be used.

Depending on the materials of the joining tape and the sheet material, it is possible to bring them into close contact with each other only by pressing without heating. Such a technique can be joined by ensuring the dry condition of the sheet material and the tape even in rainy weather, and it is possible to work outdoors, for example, in a vast area such as a waste disposal site. In the case of producing the water-blocking sheet covering the sheet, it is possible to join the factory-produced sheet materials to form a large sheet at the site, and also to inspect the joining quality of the joining portion.

[0018]

According to the present invention described in detail above, at least two rows are provided so as to form a gap with a heat-fusible joining tape between the sheet materials at the joining points where the sheet materials are superposed, and the gaps are formed. By heating the sheet materials while suctioning them together while keeping the pressure reduced, it is possible to closely join the overlapped joints, and because large equipment and large-scale joining equipment are not required, It has the effect of joining work with.

Furthermore, since the joining work can be performed at or near the place where the sheet is laid, there is an effect that it can be performed without being affected by the condition of the ground and the weather. Further, if flat working conditions are secured, there is no limitation on the joining length, and the workability is excellent.

Further, it is possible to inspect the joining quality of the portion immediately after joining and to prevent an accident such as leakage from the joining portion after laying.

[Brief description of drawings]

FIG. 1 is an explanatory view of a heat fusion device.

FIG. 2 is an enlarged cross-sectional explanatory view of a seal structure example.

FIG. 3 is an explanatory diagram showing a joining example of a joining portion.

FIG. 4 is a surface explanatory view showing an example of a joint portion.

FIG. 5 is a sectional explanatory view showing an example of a joining tape.

FIG. 6 is an explanatory view of a state in which the joint portion is covered with a heat circulation container.

FIG. 7 is an explanatory view of a state in which sheet materials are joined.

[Explanation of symbols]

1 sheet material 2 joints 3 joining tape 4 gap 5 Heat circulation container 6 openings 7 Heat supply device 8 Circulation pipe 9 Pressure reducer 10 Intake pipe

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Claims (6)

[Claims] 1. At least two rows of joining tapes are arranged in a joining portion where sheet materials are overlapped with each other to form a gap between the tapes, and air in the gap is sucked so that the sheet materials of the joining portion are mutually connected. A sheet material joining method for joining a sheet material joining portion by pressing in a pulled state. 2. At least two rows of joining tapes are arranged in a joining portion where sheet materials are overlapped with each other to form a gap between the tapes, and air in the gap is sucked to bring the sheet materials of the joining portion into contact with each other. A sheet material joining method for joining sheets by joining them together by heating in a pulled state. 3. The sheet material according to claim 2, wherein at least one row of the joining tapes arranged between the sheet materials at the joining portion where the sheet materials are overlapped is a heat-fusible joining tape. Joining method. 4. A heat-fusion-bonding joining tape is interposed between the sheet materials at the joining portion where the end portions of the sheet materials are overlapped, and the joining portion is joined by heating while maintaining a reduced pressure in the gap between the tapes. Then, after adhering the joints to each other, the decompressed state is released, and then the pressure is reduced again, and the leakage of the joints is inspected. 5. A container for heat circulation having an arbitrary shape having an opening having a width capable of sufficiently covering the width of the joint portion of the sheet material,
A sheet material joining device comprising a heat supply device connectable to the heat circulation container by a circulation pipe and a pressure reducing device connectable to a gap between the joining tape rows by an intake pipe. 6. The sheet material joining apparatus according to claim 4, wherein the heat supply device is a hot air circulation type.