Two skin annularly ribbed tube

Details Two skin annularly ribbed tube Two skin annularly ribbed tube

B - Operations, Transporting

29

C

18/759

B29C 47/06 (2006.01) B29C 47/00 (2006.01) B29C 47/12 (2006.01) B29C 47/20 (2006.01) B29C 59/04 (2006.01)

Patent

CA 2018394

A method of molding annularly ribbed tube in a travelling mold tunnel comprises coextruding coaxial inner and outer parisons of thermoplastic material into the mold space. The parisons enter the mold space together in layered relationship. The outer parison forms an outer skin in the resulting tube and may suitably be polyvinyl chloride.

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