Method of producing biaxially oriented tubular polyetheretherket

Details Method of producing biaxially oriented tubular polyetheretherket Method of producing biaxially oriented tubular polyetheretherket

1985-09-16

1987-08-18

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264564, 264567, 2642893, 2642902, 26433121, B29C 4788

Patent

active

046876154

ABSTRACT:
A method of producing biaxially oriented tubular polyetheretherketone films having good optical and mechanical properties and heat resistance, by rapidly quenching at a rate of at least 24.degree. C. per second an unoriented tubular polyetheretherketone film as melt-extruded through a circular die thereby imparting a crystallinity of not greater than 10% to the film, and continuously introducing the thus produced film into the space between a feed nip roll pair and a pull nip roll pair while reheating the film externally to a temperature of 60.degree.-140.degree. C. and allowing the film to expand under the influence of the internal pressure to an areal draw ratio of 4-36, to thereby attain biaxial orientation.

REFERENCES:
patent: 3142092 (1964-07-01), Ralston
patent: 3278663 (1966-10-01), Graham
patent: 3671617 (1972-06-01), Nagase
patent: 3857917 (1974-12-01), Reade
patent: 4120931 (1978-10-01), Fukushima et al.
patent: 4435350 (1984-03-01), Fukushima et al.
patent: 4451306 (1984-05-01), Verne

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