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

189/66

B29C 6/00 (1980.01)

Patent

CA 1167789

SMOOTH-LINED CORRUGATED PIPE AND METHOD FOR MANUFACTURE Abstract of the Disclosure A smooth, plastic-lined corrugated pipe having 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. -1-

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