Process for producing polyester film

Details Process for producing polyester film Process for producing polyester film

1981-09-21

1983-01-25

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642358, 2642902, B29D 702, B29C 1702

Patent

active

043702910

ABSTRACT:
A biaxially oriented polyester film which is well balanced between sliding properties and transparency and having an enhanced uniformity in thickness is prepared by a process wherein a polyester, predominantly comprised of polyethylene terephthalate, is extruded into a sheet form extrudate; the extrudate is quenched to a temperature of below Tg to obtain a solidified, substantially amorphous film; the film is drawn in the longitudinal direction at a drawing ratio of larger than 2.4 but smaller than 6.5; the film is quenched; and then, the film is drawn in the transverse direction at a drawing ratio of at least 2.5. The drawing in the longitudinal direction is carried out in two steps wherein:

REFERENCES:
patent: 3256379 (1966-06-01), Heffelfinger
patent: 4237088 (1980-12-01), Yoshimura

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