Method of manufacturing polyester films

Details Method of manufacturing polyester films Method of manufacturing polyester films

1979-08-14

1980-11-18

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Disparate treatment of article subsequent to working,...

Effecting temperature change

B29C 1702, B29C 2500

Patent

active

042345324

ABSTRACT:
The present invention relates to a process for preparing a highly tensilized polyester film that has enhanced mechanical properties in both longitudinal and transverse directions. The process involves the simultaneous machine and transverse direction stretching and subsequent heat setting of a film that has already been highly stretched in the machine and transverse directions individually. During the simultaneous stretching process both the temperature and rate of linear movement of the film are controlled.

REFERENCES:
patent: 2884663 (1959-05-01), Allet
patent: 3461199 (1969-08-01), Campbell
patent: 4042569 (1977-08-01), Bell et al.

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