US 11,717,996 B2
Molding method
Yi-Chung Lee, Taichung (TW); Liang-Hui Yeh, Taichung (TW); and Ching-Hao Chen, Taichung (TW)
Assigned to KING STEEL MACHINERY CO., LTD., Taichung (TW)
Filed by KING STEEL MACHINERY CO., LTD., Taichung (TW)
Filed on May 25, 2021, as Appl. No. 17/330,222.
Claims priority of provisional application 63/083,509, filed on Sep. 25, 2020.
Prior Publication US 2022/0097266 A1, Mar. 31, 2022
Int. Cl. B29C 44/42 (2006.01); B29C 44/02 (2006.01); B29C 44/60 (2006.01)
CPC B29C 44/42 (2013.01) [B29C 44/02 (2013.01); B29C 44/60 (2013.01)] 20 Claims
OG exemplary drawing
 
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.