Method for manufacturing polyester films

Details Method for manufacturing polyester films Method for manufacturing polyester films

1979-08-07

1980-10-07

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

042268265

ABSTRACT:
The present invention relates to a process for preparing a polyester film which has not only uniaxially enhanced mechanical properties but also biaxially enhanced mechanical properties. The process involves heat-setting a biaxially oriented polyester film at a temperature above that used for the machine and transverse direction stretching and above that used for the machine direction re-stretching, but at least 10.degree. C. below the melting point of the polyester, then re-stretching the film in both the machine and transverse directions, and re-heat-setting the film.

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

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