JPS6242783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a waterproof sheet with a foam layer used when waterproofing a building or the like.

As a waterproof sheet, it improves the ability to follow the underlying surface,
It is known that a foam layer is provided on one side of the sheet body for the purpose of preventing damage to the sheet body.

Conventionally, such waterproof sheets with a foam layer have been manufactured by applying adhesive to the joint surfaces of the sheet body and the foam sheet and then bonding them together, but this method is not economical due to the complicated process. Not only were there problems, but the use of adhesive also caused problems in terms of occupational health.

The present invention has been made to provide a new method for manufacturing a waterproof sheet with a foam layer that solves the drawbacks of the prior art. A waterproof rubber sheet body heated to a temperature of , the foamed sheet material side is continued to be brought into contact with the cooling roll while being kept in a press-contact state, and is advanced and drawn out.

With this method, when a foamed sheet, such as a foamed polyethylene sheet or a foamed polystyrene sheet, comes into contact with a waterproof sheet body that has been heated to a temperature slightly higher than its melting point, such as an ethylene-propylene-based waterproof rubber sheet, its Due to the heat, only the surface softens and melts and is bonded to the main body of the waterproof sheet using a so-called hot melt method, so when laminating it,
The use of adhesive can be omitted. In addition, with this method, the temperature of the parts other than the surface of the foam sheet hardly rises due to its own insulation properties, so there is no thermal deformation. Therefore, by releasing the pressure, the foam sheet can be Can be easily restored. Of course, the bonded parts are cooled under pressure and solidify quickly, so even if some air is trapped during stacking, there will be no uneven bonding due to blisters, etc., and the appearance is good. A waterproof sheet with a foam layer can be obtained.

An example of the present invention will be described below with reference to the drawings. The drawings schematically show the prevention sheet main body 3.
The surface of the sheet is heated to a predetermined temperature by the heating roll 1, and is overlapped with the foamed sheet 4 introduced between the cooling roll 2 and wound up together with the foamed sheet via the cooling roll 2. It's getting old. In this configuration, the surface temperature of the heating roll 1 is maintained at about 140°C and the surface temperature of the cooling roll 2 is maintained at about 20°C, and a sheet 3 of ethylene propylene rubber with a thickness of 1 mm and a width of 1.2 m and a commercially available Thickness 4mm
When processing was carried out using a foamed polyethylene sheet (melting point: about 115°C) 4, sheets 3 and 4 did not adhere at all at a speed that brought the surface temperature of sheet 3 to about 100°C, and at about 135°C, Although it was adhered, the sheet 4 was thermally deformed and the foaming state also changed.

On the other hand, when sheet 3 was processed at a surface temperature of about 120° C., a composite sheet with good adhesion was obtained with almost no change in sheet 4.

For this composite sheet, the tensile speed was 200mm/
A T-shaped peel test was conducted at 25% solids content.
Similar to the composite sheet bonded using 700 prene adhesive, the foamed polyethylene was destroyed and the bonded area remained unchanged.

As is clear from this example, according to the present invention, although the sheet material is somewhat limited, it is possible to easily obtain a waterproof sheet with a foam layer equivalent to that using an adhesive, and its industrial value is There is something very big about it.

[Brief explanation of the drawing]

The figure is a schematic explanatory diagram showing an example of the method according to the present invention. 1: heating roll, 2: cooling roll, 3: waterproof sheet body, 4: foam sheet.

Claims (1)

[Claims] 1. A pre-formed foam sheet material and a waterproof rubber sheet body whose surface has been heated to a temperature higher than the melting point of the foam sheet material are placed between a pair of rolls, one of which is a cooling roll, between the surface and the foam sheet. With a foam layer, the foamed sheet material is introduced with the materials facing each other and the foamed sheet material is placed on the side of the cooling roll, and the foamed sheet material is brought into contact with the cooling roll. Method of manufacturing tarpaulin.