| 发明名称 |
DOUBLE-WALLED CORRUGATED PLASTIC TUBES |
| 摘要 |
<p>A method is disclosed for manufacturing double-walled plastic tubing with an outer wall having transverse annular corrugations and a smooth annular channels linking them to the external atmosphere and/or to each other. During cooling of the extruded tube, distortion of the annular channels due to changing air pressure within them is avoided. After cooling, the openings are closed.</p> |
| 申请公布号 |
CA1061726(A) |
申请公布日期 |
1979.09.04 |
| 申请号 |
CA19770284771 |
申请日期 |
1977.08.16 |
| 申请人 |
HEGLER, WILHELM;HEGLER, RALPH-PETER |
发明人 |
HEGLER, WILHELM;HEGLER, RALPH-PETER |
| 分类号 |
F16L11/11;B26F1/00;B29B7/00;B29C45/00;B29C47/00;B29C47/24;B29C47/88;B29C49/00;B29C53/30;B29C59/00;B29C65/00;B29D23/18;B29D24/00;F16L9/18;F16L57/00;(IPC1-7):16L9/18 |
主分类号 |
F16L11/11 |
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