Smooth-lined corrugated pipe and method of manufacture

Details Smooth-lined corrugated pipe and method of manufacture Smooth-lined corrugated pipe and method of manufacture

B - Operations, Transporting

29

C

154/8.01

B29C 44/32 (2006.01) B32B 1/08 (2006.01)

Patent

CA 1175328

ABSTRACT OF THE DISCLOSURE A smooth, plastic-lined corrugated pipe has an intermediate layer of plastic foam. The pipe is made by internally coating a corrugated pipe with a foaming mixture and pressing an expandable cylinder of plastic sheet liner against the foaming mixture until the foam solidifies. An expandable mandrel apparatus presses the plastic sheet liner into position. The mandrel is maintained in its expanded condition until the foam has solidified and is then collapsed and withdrawn.

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