CPC B29C 44/42 (2013.01) [B29C 44/02 (2013.01); B29C 44/60 (2013.01)] | 20 Claims |
1. A molding method, comprising:
providing a molding device, wherein the molding device includes a mold cavity, a feeding port in communication with the mold cavity, and a junction point in connection with the mold cavity;
engaging an outlet of an injector to the feeding port;
injecting a first gas into the mold cavity through the junction point to increase a pressure in the mold cavity to a first pressure;
injecting a molding material including a blowing agent into the mold cavity having the first pressure from the feeding port by the injector; and
after accomplishment of the injection of the molding material, injecting a second gas into the mold cavity through the junction point to increase the first pressure inside the mold cavity to a predetermined pressure for maintaining the blowing agent in a supercritical state,
wherein the predetermined pressure is substantially greater than the first pressure.
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