JPS591182B2 - Method for manufacturing adhesive foam sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing shaped adhesive foam sheets.

Conventionally, in order to insulate or cushion objects with curved surfaces, such as stainless steel sinks, if a synthetic resin foam with an adhesive layer is bent and adhered, the foam will peel off from the edges over time, so the foam cannot be used. It is used by pasting a molded product that fits tightly onto the curved surface.

The above foam can be molded by providing an adhesive layer on one side of the foam, adsorbing a non-breathable mold release material to the layer, heating the resulting laminate, and vacuuming from the foam side. It has been reported.

It is preferable for the foam to have a closed cell structure in terms of heat retention, cushioning properties, and water absorption. However, in the above molding method, when the foam has closed cells, that is, when it is non-breathable, However, when the residual solvent in the adhesive is heated, it evaporates and expands, resulting in poor molding and peeling of the adhesive layer.

An object of the present invention is to provide a manufacturing method that can mold adhesive foam molded articles with excellent heat retention and cushioning properties and no water absorption with good moldability without peeling of the adhesive layer.

That is, the gist of the present invention is to provide at least one surface of a closed-cell thermoplastic resin foam sheet, via an adhesive layer, with a thermoplastic resin having releasability and having perforations on the surface in contact with the adhesive layer. The present invention relates to a method for manufacturing a shaped adhesive foam sort, characterized in that an adhesive foam sheet formed by laminating films is heated and vacuum-formed by suctioning from the film side.

The foam 7 used in the present invention is a foam made of thermoplastic resin and has closed cells.

Examples of the thermoplastic resin include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyvinyl chloride, and the like, with crosslinked polyethylene being preferred.
Further, the foaming ratio and thickness of the foam sheet are not particularly limited, but the foaming ratio is 5 to 35 times, and the thickness is 2 mm.
Preferably it is ~10 cm. The thermoplastic resin film used in the present invention has releasability and has perforations.

Preferably, the thermoplastic resin film is stretchable, such as films made of polyethylene, polypropylene, polyvinyl chloride, polyester, etc., and polyethylene film is preferably used. If the film has releasability, it is used as is, but if it does not have releasability, it is used after being subjected to a release treatment. Further, the size of the perforation is not particularly limited, but the diameter thereof is preferably 0.1 mm or more, and more preferably 0.2 to 1.0 mm.
In the present invention, the adhesive foam sort is obtained by laminating the thermoplastic resin film on the thermoplastic resin foam sheet with an adhesive layer interposed therebetween such that the surface having mold releasability of the film is in contact with the adhesive layer. The film is heated and vacuum-formed by suction from the film side.

The adhesive layer may be a uniform layer or may be provided with small holes, but in the present invention, vacuum forming is performed by suctioning from the film side, so the adhesive does not flow through the perforations provided in the film. Since there is a risk of leakage, it is preferable that small holes be provided in the adhesive layer so that no adhesive is present in the portions of the adhesive layer corresponding to the perforations in the film. It is more preferable that the holes are slightly larger.

Further, any known method may be used for producing the above-mentioned adhesive foam sheet, such as a method in which an adhesive is applied to a foam sheet, dried, and then a film is laminated thereon. Adhesive foam sorting, in which small holes are also provided in the adhesive layer, can be applied, for example, by applying an adhesive to a non-perforated film, drying it, perforating it, and then laminating it on a foam sorting. A method of coating and drying an adhesive with a gravure coater to provide an adhesive layer with small holes, and then laminating a film with perforations corresponding to the small holes provided in the adhesive layer,
It is manufactured by applying an adhesive to a perforated film using a gravure coater, drying it, and then laminating a foam sheet. The manufacturing method of the present invention is as described above, and since the thermoplastic resin film is perforated, the residual solvent in the adhesive layer is scattered through the perforations during vacuum forming, so the adhesive layer and film are The adhesive foam sheet can be shaped without the layers peeling off due to floating, and the adhesive foam sheet has excellent molding accuracy on the side that contacts the adherend.

Claims (1)

[Scope of Claims] 1. At least one surface of a closed-cell thermoplastic resin foam sheet is provided with a heat-resistant material having mold releasability and perforations in contact with the adhesive layer through an adhesive layer. 1. A method for producing a shaped adhesive foam sheet, which comprises heating an adhesive foam sheet formed by laminating plastic resin films and vacuum forming the sheet by suctioning from the film side. 2. The manufacturing method according to claim 1, wherein the foam sheet is a crosslinked polyethylene foam sheet. 3. The manufacturing method according to claim 1, wherein the thermoplastic resin film is a polyethylene film. 4. The manufacturing method according to claim 1, wherein the diameter of the perforation is 0.1 mm.