Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
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.
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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.
Anderson Philip E.
Bethlehem Steel Corporation
Iverson John I.
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