INJECTION MOLDING METHOD AND APPARATUS, AND VALVE PIN

摘要

PROBLEM TO BE SOLVED: To mold a molded product free from a transparent line and having uniform pearl gloss in the injection molding of a resin for developing pearl gloss. SOLUTION: At least the part facing to a flow path 6b of the valve pin 21 arranged in a resin flow path 6c within a hot runner 2 is formed into a small diameter part low in the resistance against an inflow resin. The flow of the inflow resin is smooth when the resin strikes against the small diameter part to flow in a divided form or to flow together. By this constitution, the generation of a physical property change is suppressed and the generation possibility of a transparent line in a molded product is prevented.