Injection-molding method for injecting molten plastic into cavity between mold and male mold, involves injecting gases into chamber, and hardening plastic at side surface of mold by supplying cooling medium into hot medium path of mold

摘要

The method involves heating an upper side of a mold (6) forming a cavity (S) by supplying hot mediums to a hot medium path (12) of the mold for increasing temperature of a flat side forming the cavity. A preset amount of molten plastic is injected into the cavity after acquiring the temperature increase. Compressed gases are injected into a chamber between a rearward side of the plastic and a surface of a male mold (27) after injection of the plastic. The plastic at a side surface of the mold is hardened by supplying a cooling medium into the path of the mold by the compressed gases. An independent claim is also included for an injection molding machine for injecting a molten plastic into a cavity between a mold and a male mold.