Injection molding process of the injection molding apparatus and a multilayer molded article for molding a multilayer molded article

摘要

PROBLEM TO BE SOLVED: To provide an injection molding machine for sure preventing an appearance of a resin for not constituting outermost layer on an outermost layer, in a multilayer structure obtained by laminating resin layers molded of at least two types of resins. ;SOLUTION: The injection molding machine comprises a structure having a mold 20 including a cavity 25 and a hot runner, and at least two injection cylinders 10A, 10B in such a manner that resin channels 23A, 23B for coupling the cylinders 10A, 10B to the cavity 25 are combined upstream of a gate 24 opened with the cavity 25, and a backflow means 30B for introducing a predetermined amount of molten resin 40A flowing through one channel 23A to the other channel 23B at the time of injecting the resin 40A in the cavity 25 via the one channel 23A.;COPYRIGHT: (C)1999,JPO