Forming single wall bells in double wall pipe

Details Forming single wall bells in double wall pipe Forming single wall bells in double wall pipe

B - Operations, Transporting

29

C

18/522.5

B29C 57/08 (2006.01) B29C 47/06 (2006.01) B29C 49/00 (2006.01)

Patent

CA 1182962

ABSTRACT A method and an apparatus for producing double walled thermoplastic pipe with integral bells are disclosed. The pipe has corrugated outer wall that has the bells molded into it, and a smooth inner wall. The inner wall is removed from the bell after the pipe is formed and set. During production, the inner wall is punctured along the bell section to admit air into the chamber between the two walls. This prevents collapse of the outer wall due to reduced air pressure as the air in the chamber cools.

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