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AssigneeKomatsu Ltd.
InventorsKan'ichi Sato, Masayuki Oishi, Satoshi Fujimoto, Makoto Nogawa
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A composite sheet material, in which at least either one of opposed surfaces is composed of a glass layer for the purpose of surface protection from scratching, can be easily produced without causing bonding defects and stress-strain. A method of such a material is also disclosed. This material comprises (a) a glass layer made of sheet glass and constituting one of the opposed surfaces of the composite sheet material; and (b) a resin layer constituting the other surface of the material and molded by applying a uniform pressure to an entire molten resinous material introduced onto the glass layer so as to be elongated, spreading over the glass layer, these glass layer and said resin layer being laminated.
A method for producing a composite sheet material having a glass layer and a resin layer which are laminated together, the method comprising the steps of:
A composite sheet material producing method, wherein two sheet glasses are first provided so as to be respectively in contact with the respective inner sides of both dies used in a compression molding machine and then while supplying a molten resinous material to a mold cavity, compression molding is carried out by applying a uniform pressure to an entire molten resinous material which has been introduced into a mold cavity and then closing the dies to complete compression molding, such that the molten resinous material is elongated, spreading over the sheet glasses, whereby the laminated plate having, in a laminated fashion, a first glass layer composed of the sheet glass, a resin layer molded from the molten resinous material that is spread by applying a pressure and a second glass layer composed of the sheet glasses can be formed.
Dependencies are inferred from the claim text.