Pipe extrusion die with a cooled and vacuumed additional...

Details Pipe extrusion die with a cooled and vacuumed additional... Pipe extrusion die with a cooled and vacuumed additional...

B - Operations, Transporting

29

C

18/760

B29C 47/88 (2006.01) B29C 47/06 (2006.01) B29C 47/90 (2006.01)

Patent

CA 1314676

ABSTRACT OF THE DISCLOSURE An extrusion die, particularly for double-walled corrugated thermoplastic pipes, including an extrusion head, a nozzle, two concentric hollow mandrels carrying die lips and a cooled and vacuumed third mandrel. The vacuum is maintained between the third mandrel and the inner wall of the pipe by means of groups of channels, each such group having an independent vacuum pressure to prevent retraction of the wall from the mandrel until the wall is set and to allow adjustment of the pressure along the length of the mandrel.

578775

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