发明公开
EP0430596A1 Parison head for use in a multi-layer blow moulding machine
失效
Extruderkopffürmehrschichtigen Vorformling in einer Blasformmaschine。
- 专利标题： Parison head for use in a multi-layer blow moulding machine
- 专利标题（中）： Extruderkopffürmehrschichtigen Vorformling in einer Blasformmaschine。
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申请号： EP90312759.5申请日： 1990-11-23
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公开(公告)号： EP0430596A1公开(公告)日： 1991-06-05
- 发明人: Kawabata, Kotaro , Sato, Kazuyuki
- 申请人： ISHIKAWAJIMA-HARIMA JUKOGYO KABUSHIKI KAISHA
- 申请人地址： 2-1, Ote-machi 2-chome Chiyoda-ku Tokyo 100 JP
- 专利权人： ISHIKAWAJIMA-HARIMA JUKOGYO KABUSHIKI KAISHA
- 当前专利权人： ISHIKAWAJIMA-HARIMA JUKOGYO KABUSHIKI KAISHA
- 当前专利权人地址： 2-1, Ote-machi 2-chome Chiyoda-ku Tokyo 100 JP
- 代理机构： Jennings, Nigel Robin
- 优先权： JP137824/89U 19891128
- 主分类号： B29C47/20
- IPC分类号： B29C47/20
摘要：
A parison head for use in a multi-layer blow moulding machine comprises a head body (1), a core (2) within the head body, a mandrel (4) at one end of the core which, together with the head body, defines an annular extrusion slit (6), a plurality of annular accumulator spaces (7-11) concentric with the core and a plurality of annular passages (12-16), each connecting one end of respective accumulator space with the extrusion slit. At least one of the passages (12-16) includes an annular valve (47) which normally closes the passage but is arranged to be opened when the pressure of the feed material in the associated passage exceeds a predetermined value.
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