Freeze-resistant plastic pipe and method for its manufacture

Details Freeze-resistant plastic pipe and method for its manufacture Freeze-resistant plastic pipe and method for its manufacture

1987-02-26

1988-09-27

Anderson, Philip

Pipes and tubular conduits

With pressure compensators

Freeze protecting

138149, 138DIG9, 264 455, 264 459, 264171, 264DIG14, 4251331, 425817C, E03B 710, B29C 6722, B29C 4706, B29C 4726

Patent

active

047734485

ABSTRACT:
A plastic pipe with a hard outer shell lined with an inner shell of soft resilient plastic foam with a smooth central axial passageway adapted to be a conduit for liquid. A method of manufacturing this pipe which comprises simultaneously extruding the material for the outer shell and the foamable material for the inner shell into a pipe forming die.

REFERENCES:
patent: 3411981 (1968-11-01), Thomas
patent: 3449477 (1969-06-01), Logomasini
patent: 3764642 (1973-10-01), Boutillier
patent: 3874981 (1975-04-01), Hayashi et al.
patent: 3985931 (1976-10-01), Blackwelder
patent: 4054403 (1977-10-01), Hornbeck et al.
patent: 4322260 (1982-03-01), Conlon
patent: 4364882 (1982-12-01), Doucet
patent: 4383812 (1983-05-01), Calcagni

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