Method of making extruded conduits

Details Method of making extruded conduits Method of making extruded conduits

1987-04-03

1989-03-14

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Flame contact or reshaping by heat decomposition of work

264150, 2642094, 2642097, 264235, 264346, 264348, 425 71, 425325, 4253791, B29C 4790

Patent

active

048122742

ABSTRACT:
An extruded thermoplastic polymer conduit having a conduit wall of substantially uniform crystalline morphology through the entire thickness thereof free of any oriented surface zone is formed by heating to melt the surface zone and cooling to recrystallize the surface zone.

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patent: 3553303 (1971-01-01), Zavasnik
patent: 3655848 (1972-04-01), Young et al.
patent: 3965226 (1976-06-01), Werwitzke et al.
patent: 4115495 (1978-09-01), Hartitz
patent: 4159889 (1979-07-01), Yagi et al.
patent: 4305899 (1981-12-01), Van Dongeren

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