Helical pipes and method of manufacture thereof

Details Helical pipes and method of manufacture thereof Helical pipes and method of manufacture thereof

1989-12-26

1992-05-12

Stodola, Daniel P.

Pipes and tubular conduits

Flexible

267166, F16L 1104

Patent

active

051118491

ABSTRACT:
Extruded pipes of thermoplastically processable polymers are wound cold around a mandrel and thereafter subject to thermal fixing. During or before winding, the pipe is twisted in a direction opposite to that of the helix formation, about its longitudinal axis, preferably through angles of 5.degree. to 360.degree. per coil. The resilience of the coiled pipe is surprisingly improved to the point where the resilience factor R approaches 1.0.

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patent: 3402743 (1968-09-01), Brueder
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patent: 3936417 (1976-02-01), Rouden
patent: 4009734 (1977-03-01), Sullivan
patent: 4160466 (1979-07-01), Joussou
patent: 4869471 (1989-09-01), Schwarz et al.

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