Method for producing multi-layer resin molded article by heat molding a multi-layer thermoplastic resin plate comprising a first surface and a second surface

摘要

A method for producing a multi-layer thermoplastic resin molded article having almost no drug line by thermoforming is provided. A method for producing a multi-layer thermoplastic resin molded article by thermoforming a multi-layer thermoplastic resin plate (3) comprising a first surface layer (1) and a second surface layer (2) in which the dynamic modulus(G'2) of the second surface layer (2) is less than 1x105 Pa at temperatures at which the dynamic modulus(G'1) of the first surface layer (1) is not more than 5x105 Pa, wherein the first surface layer (1) and the second surface layer (2) of the multi-layer thermoplastic resin plate (3) are heated and thermoformed at different temperatures so that the ratio (G'1/G'2) of the dynamic modulus (G'1) of the first surface layer (1) to the dynamic modulus(G'2) of the second surface layer (2) is not less than 0.35 and less than 2.8.