MOUTHPIECE FOR MOLDING THERMOPLASTIC RESIN AND METHOD FOR MOLDING THERMOPLASTIC RESIN

摘要

PROBLEM TO BE SOLVED: To enhance quality by reducing temp. irregularity in a lateral direction and improving thickness accuracy while rapidly corresponding to various production conditions when a molten thermoplastic resin is to be cooled in the land part of a mouthpiece. SOLUTION: A molding cap 1 cools a thermoplastic resin of which the temp. is higher than melting completion temp. Tme to temp. below Tme and higher than temp. drop crystallizing start temp. Tcb in a land part 4 to mold the same. In this case, the thermoplastic resin is cooled by circulating a heating medium having temp. equal to or lower than the cooling temp. of the thermoplastic resin into the mouthpiece 1.