Method for diametrically expanding thermally contractive ptfe re

Details Method for diametrically expanding thermally contractive ptfe re Method for diametrically expanding thermally contractive ptfe re

1976-12-14

1978-08-01

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264 95, 264108, 264127, 264209, 264211, 264230, 264DIG71, B29C 1707

Patent

active

041043944

ABSTRACT:
An unsintered tube of extruded ptfe resin is heated above its melting temperature of 327.degree. C, a positive pressure is established within the tube relative to the external pressure thereon to radially expand it, and the pressure is maintained until the tube is cooled below its melting point and set. Such a tube demonstrates superior strength and crack resistance when it is thereafter radially contracted around a core member by reheating, and its longitudinal shrinkage is minimized.

REFERENCES:
patent: 2456621 (1948-12-01), Cheney
patent: 2791806 (1957-05-01), Tordella
patent: 2821155 (1958-01-01), Seckel
patent: 3008187 (1961-11-01), Slade
patent: 3086242 (1963-04-01), Cook et al.
patent: 3225129 (1965-12-01), Taylor et al.
patent: 3370112 (1968-02-01), Wray

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