Method of modifying corrugated or ribbed pipe to have a...

Details Method of modifying corrugated or ribbed pipe to have a... Method of modifying corrugated or ribbed pipe to have a...

F - Mech Eng,Light,Heat,Weapons

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F16L 9/19 (2006.01) B29C 43/22 (2006.01) B29C 47/06 (2006.01) B29C 47/12 (2006.01) B29C 53/22 (2006.01) B29C 59/02 (2006.01) B29D 23/00 (2006.01) F28F 1/26 (2006.01)

Patent

CA 2056060

ABSTRACT Annularly or helically ribbed or corrugated semi-rigid thermoplastic pipe is modified to have a smooth outer wall. The ribbed or corrugated pipe is passed through a heated sleeve to squash and smooth the outer profile of corrugated pipe or bend over ribs of ribbed pipe and mold a smooth outer skin of the pipe. Apparatus for forming the modified pipe includes a travelling mold tunnel for the production of ribbed or corrugated pipe and a smoothing sleeve downstream thereof. The smoothing sleeve has a heater to heat it sufficiently to mold the smoother outer skin.

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