METHOD FOR MOLDING THERMOPLASTIC RESIN

摘要

PROBLEM TO BE SOLVED: To achieve thickness accuracy and the cost reduction of productivity by reducing temp. irregularity in a lateral direction when a molten thermoplastic resin is to be cooled in the land part of a flat die. SOLUTION: A thermoplastic resin is heated to melting completion temp. Tme or higher to be melted and the molten thermoplastic resin is cooled to temp. below Tme and higher than temp. drop crystallization start temp. Tab in the land part 4 of a flat die 1 and the cooled resin is extruded from the flat die 1 to obtain a sheet like article. In this case, a hole 2 is provided in the flat die 1 and a heating pipe is inserted into this hole 2 and cooled to cool the thermoplastic resin.