Process for the manufacture of equally biaxially oriented film

Details Process for the manufacture of equally biaxially oriented film Process for the manufacture of equally biaxially oriented film

1983-12-22

1985-08-20

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264182, 2642107, 2642896, 2642902, 264559, 264564, 264565, D01F 1100

Patent

active

045363650

ABSTRACT:
Equally biaxially oriented film is produced by extruding liquified polymer in tubular form, orienting the tubular film in the radial direction only and then either (1) equally orienting the radially oriented film in the longitudinal direction and drying the resultant equally biaxially oriented film while preventing any shrinkage thereof or (2) orienting the radially oriented film in the longitudinal direction to a degree less than said radial orientation but equal to the radial orientation remaining after the biaxially oriented film undergoes radial shrinkage upon drying thereof in the absence of radial shrinkage control and drying the resultant biaxially oriented film in the absence of radial shrinkage control.

REFERENCES:
patent: T857013 (1968-12-01), Jennings
patent: 3257490 (1966-06-01), Hovermale et al.
patent: 3280234 (1966-10-01), Osborn
patent: 3551540 (1970-12-01), Pellicciari et al.
patent: 3551546 (1970-12-01), Gosper et al.
patent: 3659000 (1972-04-01), Cronk
patent: 3821343 (1974-06-01), Sudo
patent: 4112034 (1978-09-01), Nash et al.
patent: 4140740 (1979-02-01), De Smedt et al.
patent: 4279580 (1981-07-01), Hayashi et al.
patent: 4301112 (1981-11-01), Zwick
patent: 4354997 (1982-10-01), Mizutani et al.
patent: 4388258 (1983-06-01), Hungerford
patent: 4415720 (1983-11-01), Rose
patent: 4442147 (1984-04-01), Schirmer

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