JPH0439538B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for joining thin sheets, which is applied, for example, to waterproofing the roofs and outer walls of buildings.

Conventional technology Conventionally, polyvinyl chloride-coated steel plates (hereinafter referred to as PVC steel plates) have been widely used, for example, in waterproofing the roofs and outer walls of buildings, but PVC steel plates have a predetermined size for convenience of manufacturing. Objects are joined together with their joining side edges overlapping each other, and the conventional method for joining such PVC steel sheets is to provide a gap at the joining side edge of the PVC steel sheets, so-called a gap. Mechanical joining methods such as jointing with seams or rivets, joining methods using welding such as high frequency welding or stud welding, and joining methods using adhesives are used. Ta. Among the conventional joining methods mentioned above, the first two mechanical joining methods and joining methods by welding do not provide sufficient watertightness and require the use of special joining equipment, resulting in high costs. There was a problem. On the other hand, the adhesive bonding method does not require any special equipment and can be used to bond PVC steel plates with relatively simple work, and has the advantage of providing sufficient watertightness. Widely used. However, according to this bonding method using adhesive, it takes a long time for the adhesive to harden, so especially when the base material of the PVC steel plate is thick, the two PVC The bonding side edges of the steel plates could not be made to adhere tightly with the adhesive against the undulations (irregularities) and warping of the PVC steel plates, and the bonded portions sometimes floated and peeled off. In addition, if the edges of the PVC steel plates to be joined are strongly pressed from above in order to obtain strong adhesive force, the adhesive may ooze out from the edges of the bonding side to the surface of one PVC steel plate or the surface of the other PVC steel plate. The adhesive solution may damage the appearance of the PVC steel sheets, or erode the insulation or other materials placed under the PVC steel sheets. There was a problem with the trouble of having to make careful adjustments across the board.

Purpose of the Invention The present invention was made to solve the above-mentioned problem, and it is possible to prevent the joint edges of thin sheets such as PVC steel plates from peeling off or floating when they are undulated or warped. It does not come off and can be joined reliably and firmly, and the presser pressure can be maintained constant without using a separate presser, and there is almost no adhesive extrusion, making it extremely The purpose of the present invention is to provide a method for joining thin sheets with excellent workability and a beautiful finish.

Composition of the Invention In order to achieve the above object, the present invention overlaps the joining side edges of the first and second thin sheets to be joined to each other, and when joining both sheets, one of the thin sheets 1. Attach a required length of double-sided adhesive tape to the edge of the joining side of the thin sheet, form an uncured adhesive layer on the area other than the area where the adhesive tape is pasted, and then join the other second thin sheet. The side edge portion is overlapped with the joining side edge portion of the first sheet, and both are temporarily fixed via an adhesive tape, and are brought into close contact via an uncured adhesive layer,
By curing the adhesive layer in this state,
The gist is a method for joining thin sheets, which is characterized by joining both sheets together.

In the above, the thin plate-like sheet is a synthetic resin-coated metal plate such as a PVC steel plate, a synthetic resin plate, a metal plate, or the like.

Double-sided adhesive tape is made of paper, cloth, synthetic resin film, or the like as a core material, and adhesive is applied to both sides of the core material. Acrylic rubber-based, natural rubber-based and isobutylene-based adhesive tapes are known as adhesive tapes, but it is preferable to use isobutylene-based adhesive tapes in terms of water resistance, heat resistance, and elasticity. The adhesive tape usually has a width narrower than the width of the bonding side edges of the two thin sheets stacked on top of each other, and is applied over the entire length or partially of the bonding side edges.
The width of the adhesive tape can be selected as appropriate to provide sufficient adhesive strength depending on the undulations and warping of the thin sheet, but when economical considerations are also taken into consideration, it is usually
It is preferable to set it to 50 mm.

The thickness of the adhesive tape is 0.1 to 1.0 mm, preferably 0.3 to 0.6 mm. Here, if the thickness of the adhesive tape is less than 0.1 mm, the thickness of the adhesive layer will be correspondingly thinner, and the adhesive will protrude, or the adhesive strength of the adhesive will be weak, which is not preferable. . In addition, if the thickness of the adhesive tape exceeds 1.0 mm, the gap between the joining side edges of the thin sheets stacked on top of each other will become too large, so if the adhesive tape is applied in a normal amount, the joining side edges will not be covered with adhesive. In this case, it is not economical to increase the amount of adhesive applied.

In order to completely prevent the adhesive from overflowing to the back side, it is preferable to apply the adhesive tape along the edge of the joining side of the first thin sheet; In order to completely prevent this, it is preferable to apply the adhesive tape along the inner edge of the joining side edge of the sheet, that is, along the edge of the joining side edge of the second thin sheet. Of course, the adhesive tape may be attached to the middle part of the joining side edge. This is because by interposing such double-sided adhesive tape, a gap equivalent to the thickness of the adhesive tape is secured between the joining side edges of both sheets, so the amount of adhesive applied can be reduced. By adjusting the adhesive tape appropriately, it is possible to almost prevent the adhesive from extruding, and even if a large pressing force is applied to the edges of both joining sides during joining, the presence of the adhesive tape ensures that the edges of the joining sides are not directly connected to each other. Therefore, there is no need to carefully adjust the pressing force.

Various adhesives such as acrylic and epoxy adhesives can be used as the adhesive, but when the thin sheet is a synthetic resin-coated steel plate such as a PVC steel plate or a synthetic resin plate, tetrahydrofuran, ethyl acetate, It is preferable to use an adhesive in which the required amount of vinyl chloride resin, vinyl acetate resin, and copolymer resins of these or copolymer resins of these and other resins are dissolved in a solvent such as toluene and cyclohexanone, alone or in a mixture. Better. The resin that dissolves in the solvent may contain a plasticizer, a filler, a coloring agent, etc., for example, similar to the coating resin for a PVC steel plate.

When waterproofing the roof or outer wall of a building using, for example, a PVC steel sheet as a thin sheet, a heat insulating material, a curing sheet, etc. may be interposed between the concrete wall to be waterproofed and the PVC steel sheet, or a building balcony etc., a PVC steel plate may be laid on the top surface of the wall to be waterproofed, and then a heat insulating material, artificial grass, etc. may be laid.

Examples of the above-mentioned heat insulating material include polystyrene,
Use resin foam such as polyurethane or polyethylene. In addition, as a curing sheet, in order to prevent the plasticizer from transferring to the insulation material from the PVC steel plate,
For example, a polyethylene or polypropylene film or foam, or a composite sheet of a foam of these resins and a resin film, woven fabric, or non-woven fabric is used.

Further, in order to fix one joint side edge of the PVC steel plate to the wall of the building to be waterproofed, a fixing device such as a split nail or a curl plug is used.

Embodiments Next, embodiments of the present invention will be described based on the drawings.

Example 1 In FIG. 1 showing the first example of this invention,
First and second thin sheets 1 and 2 made of PVC steel plates having a width of 914 mm and a length of 1829 mm are prepared. The thickness of these thin sheets 1 and 2 is steel plate 0.6 mm,
Front side resin coating layer 0.5mm, back side resin coating layer
It was 0.25mm, totaling 1.35mm. First, the joining side edge 1A of one of the first thin sheet sheets 1 is fixed to the concrete wall 5 of the building to be waterproofed using the fixture 6, and the end edge of the joining side edge 1A of the thin sheet 1 is A double-sided adhesive tape 3 (butyl tape, manufactured by Kinki Kasei Kogyo Co., Ltd.) having a width of 35 mm and a thickness of 0.5 mm was peeled off the lower release paper (not shown) and was pasted along the entire length. Next, the viscosity of vinyl chloride resin dissolved in tetrahydrofuran
An uncured adhesive layer 4 was formed by applying 3000 cps of adhesive to the joint side edge 1A along the adhesive tape 3 in a width of 40 mm at a rate of 50 g/m (solution state). Then, the release paper (not shown) on the upper side of the adhesive tape 3 is peeled off, and the bonding side edge 2A of the other second thin sheet 2 is attached to the bonding side edge 1 of the first thin sheet 1.
Both thin plates are stacked on top of A, temporarily fixed together with an adhesive tape 4, and brought into close contact with each other via an uncured adhesive layer 4, and left in this state for a required period of time to cure the adhesive layer 4. shape sheet 1, 2
were joined together.

In the above joining operation, although there are some undulations in the thin sheets 1 and 2 made of PVC steel plates, there is no lifting or peeling of the joining side edges 1A and 2A of both sheets 1 and 2 at the initial stage of adhesion. At the same time, there is no misalignment between the sheets 1 and 2, and the thickness of the adhesive tape 3 means that no separate presser is required and the presser pressure is constant, and there is no adhesive extrusion, resulting in extremely high workability. and the finish was beautiful. When the adhesive strength of both the thin plate-like sheets 1 and 2 was measured after being left for 7 days, it was found to be 510 kg/40 mm x 50 mm, which was sufficient for practical use. In addition, when the sealing properties of the joints were inspected by a vacuum test, there was no leakage at all, and the sealing properties, that is, watertightness, were extremely excellent.

For comparison, a thin sheet made of the same PVC steel plate as above was bonded with the above solvent-based adhesive without using adhesive tape.
At the initial stage of adhesion, there were many peeled spots on the joint side edges of both sheets, and the adhesive overflowed to the front side of the first thin sheet and the back side of the second thin sheet. When the joining side edge was strongly pressed from above using a presser to prevent the joining side edge from peeling off, more adhesive protruded out and workability was extremely poor.

Second Embodiment In FIG. 2 showing a second embodiment of the present invention,
After laying a heat insulating material 7 made of foamed polystyrene and a curing sheet 8 made of a nonwoven polyethylene fabric on the upper surface of the concrete wall 5 of the flat roof, a heat insulating material 7 made of polystyrene foam and a curing sheet 8 made of a nonwoven fabric made of polyethylene are laid, and then a heat insulating material 7 made of polystyrene foam and a curing sheet 8 made of a nonwoven polyethylene fabric are laid on the top surface of the concrete wall 5 of the flat roof. 1 and second thin sheet 1, 2
The joining side edges 1A and 2A were joined to form a heat insulating waterproof layer. In this case, since the double-sided adhesive tape 3 is pasted along the entire length of the joining side edge 1A of one first thin sheet 1,
There was no possibility that the adhesive would protrude to the back side of the second thin sheet 2, and therefore the heat insulating material 7 would not be attacked by the adhesive at all.

Example 3 In FIG. 3 showing the third example of the present invention,
A waterproof layer is provided on a plywood wall 9 that is to waterproof a balcony or the like of a building by laying first and second thin sheets 1 and 2 made of PVC steel plates using the method of the present invention in the same manner as in the first embodiment. After the formation, the artificial lawn 1 is placed through a heat insulating material 7 made of foamed polyethylene.
0 was installed.

The other points of the second and third embodiments are the same as those of the first embodiment, so the same parts are given the same reference numerals in the drawings.

Effects of the Invention As described above, the method of the present invention overlaps the joining side edges 1A, 2A of the first and second thin sheets 1, 2 to be joined to each other, thereby bonding both the sheets 1, 2 together. For joining, a required length of double-sided adhesive tape 3 is applied to the joining side edge 1A of one of the first thin sheets 1, and an uncured adhesive layer 4 is formed on the area other than the area where the adhesive tape 3 is applied. Then, the joint side edge 2A of the other second thin plate-like sheet 2 is overlapped with the joint side edge 1A of the first sheet 1, and both are temporarily fixed via the adhesive tape 3, and an uncured adhesive is applied. Close contact via layer 4,
By curing the adhesive layer 4 in this state, both the sheets 1 and 2 are joined together, so the joining side edges 1A and 2A of the thin sheets 1 and 2 such as PVC steel plates are Even if there are undulations or warps in the material, it will not float, peel, or shift, and it can be joined reliably and firmly, and the presser pressure can be maintained constant without using a separate presser. It has the advantage of being very easy to work with, with almost no adhesive protruding, and a beautiful finish.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view of a wall of a building waterproofed by the first embodiment of the method of the present invention;
The figure is a cross-sectional view of a flat roof part that has been heat-insulated and waterproofed by the second embodiment of the method of the present invention, and Figure 3 is a cross-sectional view of a flat roof part where insulation and waterproofing have been installed on the waterproof layer by the third embodiment of the method of the present invention. It is a sectional view of the veranda part of the building. 1, 2...First and second thin sheets (PVC steel plates), 1A, 2A...Joining side edge, 3...Double-sided adhesive tape, 4...Adhesive layer, 5...Concrete wall, 7... ...insulation material.

Claims (1)

[Claims] 1. When joining the joining side edges 1A and 2A of the first and second thin sheets 1 and 2 to be joined to each other and joining both sheets 1 and 2, one of the first thin sheets 1 is A required length of double-sided adhesive tape 3 is pasted on the joining side edge 1A, and an uncured adhesive layer 4 is formed on the part other than the part where the adhesive tape 3 is pasted, and then the other second thin sheet 2 is joined. The side edge portion 2A is overlapped with the joining side edge portion 1A of the first sheet 1, and both are temporarily attached via the adhesive tape 3, and are brought into close contact via the uncured adhesive layer 4, and in this state, the adhesive is applied. A method for joining thin sheets, characterized in that both sheets 1 and 2 are joined together by curing layer 4.