发明名称 |
VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG VON RIPPENFLANSCHROHREN |
摘要 |
This invention relates to a method and an apparatus for the production of ribbed pipes. The apparatus comprises a core which together with an extrusion sleeve forms a nozzle through which a plastic material is fed into a moulding space defined between a conically-enlarging mandrel and chill moulds moveable with respect to the mandrel. The volume of a moulding space defined between a plane at an end face of the extrusion sleeve, a surface of the mandrel, and a cylindrical plane projection from the surface of a kernel on the mandrel equals the combined volume of the grooves positioned at the mandrel at the mandrel at each particular moment. The method feeds a volume of the plastic material per unit time equal to volume of the pipe wall and ribs produced in that unit time. |
申请公布号 |
DD255506(A5) |
申请公布日期 |
1988.04.06 |
申请号 |
DD19870300904 |
申请日期 |
1987.03.18 |
申请人 |
UPONOR N. V. EMMAPLEIN,FOURESS BUILDING,NL |
发明人 |
JAERVEKYLAE,JURI,FI |
分类号 |
B21D53/06;B29C33/36;B29C47/00;B29C47/12;B29C47/20;B29C47/88;B29C47/90;B29C53/30;B29D23/18;B29L23/18;(IPC1-7):B29D23/22 |
主分类号 |
B21D53/06 |
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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