| 摘要 |
PROBLEM TO BE SOLVED: To restrain occurrence of a hesitation mark while a gas leak is lessened by a method wherein a molding resin is plasticized, measured, and stored at a tip part in a cylinder barrel, gas is injected into molten resin, the molten resin containing gas is filled in a mold, and gas is injected from a gas injection pin. SOLUTION: A molten resin which is plasticized and measured is stored at a tip part in a cylinder barrel 1. Gas is injected from gas injection nozzle provided to a screw head making a screw 2 suck back, and a large air bubble 7 is formed in the barrel. The molten resin containing gas is filled in a mold by an injection filling operation, and gas is injected from a gas injection pin 4 provided in the mold before and after the completion. Thereby, propagetion of gas injection pressure to a terminal end of flow of the molten resin is rapid, and a hesitation mark can be prevented from occurring. Further, gas leak is restrained from occurring, and stable molding can be executed. |
