Title:
【発明の名称】中空プラスチック物品の射出成形方法
Document Type and Number:
Japanese Patent JP3271258
Kind Code:
B2
Abstract:
A process for injection molding a hollow plastic article in which a low pressure heat-activated gas is injected in combination with a plastic material into a mold cavity of a plastic injection mold unit. When the plastic material and heat-activated gas enter the mold cavity, the gas expands to outwardly exert pressure on the plastic material thereby urging the plastic material towards the walls of the mold cavity to, in turn, form the hollow portions of the hollow plastic article. The gas remains within the hollow plastic article and continues to exert outward pressure until the plastic article has substantially cooled and hardened at which time the gas becomes dormant. Accordingly, no venting of the gas from the plastic article is necessary.
Inventors:
Hettinga, Siebold
Application Number:
JP50051793A
Publication Date:
April 02, 2002
Filing Date:
May 26, 1992
Export Citation:
Assignee:
Hettinga, Siebold
International Classes:
B29C45/00; B29C45/17; B29C45/57; (IPC1-7): B29C45/00; B29C45/57
Attorney, Agent or Firm:
Kazuo Shamoto (5 outside)
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