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

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B29C 45/00 (2006.01) B29C 33/00 (2006.01) B29C 33/10 (2006.01) B29C 45/17 (2006.01) B29C 45/34 (2006.01) B29D 22/00 (2006.01) B32B 3/20 (2006.01)

Patent

CA 1327874

PROCESS FOR INJECTION MOLDING AND HOLLOW PLASTIC ARTICLE PRODUCED THEREBY ABSTRACT 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 pressurized gas is then injected into the mold cavity to displace a portion of the still fluent plastic into a spill cavity flow coupled to the mold cavity. The article may be formed with an internal 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.

605037

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