Method of producing an internally-smooth, externally ribbed...

Details Method of producing an internally-smooth, externally ribbed... Method of producing an internally-smooth, externally ribbed...

B - Operations, Transporting

29

C

18/758

B29C 47/32 (2006.01) B29C 47/12 (2006.01) B29C 47/20 (2006.01)

Patent

CA 1331080

ABSTRACT In the production of plastic tubes or pipes which are internally smooth- walled but have peripheral ribs externally, in particular from extrud- able, more especially thermoplastic plastic such as PVC, a good filling of the cavities in the moving mold which are provided to form the ribs, is achieved in that said cavities are filled with the molten plastic first at a distance from the separating plane of the moving mold and last in the region of said separating plane.

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