APPARATUS FOR INJECTING GAS-DISSOLVED RESIN AND INJECTION MOLDING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an injection apparatus having a novel structure which prevents such troubles as the clogging of a gas supply port caused by the intrusion of a molten resin and the outflow of the molten resin caused by the supply of high pressure gas supplied into a heating cylinder and can injection-mold a resin in which supercritical inert gas is dissolved stably. SOLUTION: By operating a change-over valve 32 fitted to the nozzle part 22 of the heating cylinder 12, when high pressure inert gas is supplied from the gas supply port 34 opened in the nozzle part 22 into the heating cylinder 12, a nozzle hole 20 is shut off, and when the molten resin 18 is injected from the nozzle part 22 after the inert gas being dissolved, the gas supply port 34 is shut off from the nozzle hole 20.