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EP0315012A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for manufacturing a tube with a smooth inside and a ribbed outside from an extrudable material and apparatus for carrying out this method

Assignee: Cessione corma Inc
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Filing: 1988-10-24
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Granted: —
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Expires: 2008-10-24
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Abstract

Abstract Translated from German Bei der Herstellung innen glattwandiger, außen jedoch Umfangsrippen aufweisender Kunststoffrohre aus extrudierbarem, insbesondere thermoplastischen Kunststoff wie PVC wird eine gute Füllung der zur Bildung der Rippen vorgesehenen Hohlräume in der wandernden Hohlform dadurch erreicht, daß diese Rippen zuerst im Abstand von der Trennebene der wandernden Hohlform und zuletzt im Bereich dieser Trennebene mit der Schmelze gefüllt werden. In the production of inside smooth-walled, but outside peripheral ribs having plastic pipes made of extrudable, in particular thermoplastic, such as PVC, a good filling of the cavities provided for the formation of the ribs is achieved in the migrating hollow mold by firstly spacing these ribs from the parting plane of the migrating hollow mold and lastly be filled with the melt in the area of this parting plane.

Inventors

  • 👤 Horst Rahn

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-26 21:21
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/03; B29C48/09; B29C48/10; B29C48/13; B29C48/303; B29C2791/00; B29C2791/004; B29C2791/006; B29L; B29L2016/00; Y; Y10; Y10S; Y10S425/00; Y10S425/812

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