Method for producing a corrugated pipe having a smooth lining of

Details Method for producing a corrugated pipe having a smooth lining of Method for producing a corrugated pipe having a smooth lining of

1982-07-06

1984-03-20

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

138149, 264 457, 264 469, 425817R, B29D 2704

Patent

active

044380569

ABSTRACT:
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.

REFERENCES:
patent: 2746090 (1956-04-01), Hoover
patent: 2907074 (1959-10-01), Rhodes
patent: 3345245 (1967-10-01), Hanusa
patent: 3422856 (1969-01-01), Hunter et al.
patent: 3651180 (1972-03-01), Glueckert
patent: 3894131 (1975-07-01), Speech
patent: 4245970 (1981-01-01), St. Onge
patent: 4367105 (1983-01-01), Rosier et al.

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