发明名称 |
PIPE EXTRUSION DIE AND RESIN PIPE |
摘要 |
<p>A pipe molding die of the present invention is capable of rectifying a flow of a molten resin by a resin reservoir and uniformizing the flow of the resin extruded from the die in whichever position in a peripheral direction on a flow path within the die. Consequently, ununiformity in wall thickness of the resin pipe to be molded can be eliminated. The pipe molding die comprises a throttle part as one of components thereof, which includes a core, a shell part fitted to the core and a resin reservoir as a portion of a flow path which is formed between the core and the shell part. A molten resin as a pipe raw material flows through the flow path. The resin reservoir is provided in at least one of the core and the shell part, and takes a ring-like shape circumscribing a central axis of the pipe molding die with the central axis centered. The resin reservoir assumes a recessed shape in cross-section. <IMAGE></p> |
申请公布号 |
EP0834385(A1) |
申请公布日期 |
1998.04.08 |
申请号 |
EP19970908490 |
申请日期 |
1997.03.13 |
申请人 |
MITSUI CHEMICALS, INC. |
发明人 |
YOSHIMURA, YOSHIHIRO;NISHIMURA, KATUNARI;MURATA, TAKUMI;YAMADA, MASAHIRO |
分类号 |
B29C47/20;(IPC1-7):B29C47/20 |
主分类号 |
B29C47/20 |
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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