发明名称 |
Gas-assisted injection molding |
摘要 |
<p>A thermoplastic article can be injection molded in a mold (10) which comprises a cavity (28) defining the shape of the article, at least one thermoplastic entry aperture (23) which is adapted to receive molten thermoplastic resin from a nozzle (22) of an injection molding machine (24), a thermoplastic flow path (21, 26, 30) communicating with the thermoplastic entry aperture and the cavity, and a fluid flow passageway (32, 34) extending into the mold. The fluid flow passageway extends from an exterior surface of the mold to the thermoplastic flow path. A low viscosity fluid such as a gas can be injected through the fluid flow passageway and into the thermoplastic flow path. An end portion (44) of the fluid flow passageway adjacent the thermoplastic flow path has a porous metal plug (50) disposed therein. The porous metal plug comprises a porous metal core (64) which permits the low viscosity fluid to flow therethrough but prevents the passage of molten plastic therethrough. The porous metal core can comprise a sintered metal. Alternatively, the fluid flow passageway can extend from an exterior surface of the mold directly to the mold cavity, rather than the thermoplastic flow path. <IMAGE></p> |
申请公布号 |
EP0640456(B1) |
申请公布日期 |
1997.06.04 |
申请号 |
EP19930113433 |
申请日期 |
1993.08.23 |
申请人 |
CASCADE ENGINEERING, INC. |
发明人 |
SCHNEIDER, DAVID R.;RUSSELL, ROBERT W.;SOROLA, BRETT S. |
分类号 |
B29C45/00;B29C45/17;B29C45/26;B29L22/00;(IPC1-7):B29C45/17 |
主分类号 |
B29C45/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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