发明名称 |
APPARATUS FOR PRODUCING DOUBLE-WALLED CORRUGATED PIPES |
摘要 |
An apparatus for producing helically wound double-walled fused thermoplastic pipes, corrugated outside and smooth inside. The apparatus includes extruder means forming two bands of a thermoplastic material, a former shaping the corrugated configuration of and helically winding the first extruded band, a cooled element pressing the second band to the inside of the corrugations and having passages communicating with the second band and with a vacuum means. |
申请公布号 |
EP0248368(A3) |
申请公布日期 |
1988.10.19 |
申请号 |
EP19870107855 |
申请日期 |
1987.05.30 |
申请人 |
LUPKE, MANFRED ARNO ALFRED |
发明人 |
LUPKE, MANFRED ARNO ALFRED |
分类号 |
B29C69/02;B29C31/00;B29C47/06;B29C53/58;B29C53/82;B29C53/84;B29C63/32;B29D23/00;B29D23/18;B29D24/00;B29L23/18;F16L55/00;(IPC1-7):B29D23/18 |
主分类号 |
B29C69/02 |
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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