Process for injection molding and hollow plastic article...

Details Process for injection molding and hollow plastic article... Process for injection molding and hollow plastic article...

B - Operations, Transporting

29

C

18/715

B29C 45/00 (2006.01) B29C 33/10 (2006.01) B29D 22/00 (2006.01)

Patent

CA 1332863

A process for injection molding hollow plastic articles includes the steps of sequentially injecting fluent plastic and gas into a mold cavity. A quantity of fluent plastic is initially injected to substantially fill the mold cavity. A charge of pres- surized gas is then injected into the mold cavity to displace a portion of the still fluent plastic into a spill cavity flow coup- led to the mold cavity. The article may be formed with an intern- al wall by introducing first and second gas charges into the mold cavity at separate entry points. In one embodiment, the first and second charges are introduced substantially simultaneously. In a second embodiment, the charges are introduced sequentially. After the hollow plastic article has solidified, the gas is vented.

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