Process for stretching polyester films

Details Process for stretching polyester films Process for stretching polyester films

1984-01-16

1986-10-14

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Disparate treatment of article subsequent to working,...

Effecting temperature change

2642902, B29C 5514

Patent

active

046171649

ABSTRACT:
A process for preparing high tensile strength polyester film especially suitable for manufacturing magnetic recording tapes is disclosed. A raw polyester film is first stretched longitudinally so as to have an index of birefringence of 0.015-0.055, is then further stretched in the same direction at a temperature between 95.degree. C. and 150.degree. C. while the index of birefringence of the film is prevented from exceeding 0.080, is then stretched transversely to 2.5-5 times its width and is further stretched longitudinally and/or transversely to 1.1 times or greater. The product has high tensile strength as well as excellent flatness and slipperiness properties.

REFERENCES:
patent: 2968065 (1961-01-01), Gronholz
patent: 3461199 (1969-08-01), Campbell
patent: 4042569 (1977-08-01), Bell et al.
patent: 4226826 (1980-10-01), Motegi et al.
patent: 4230658 (1980-10-01), Matsukura et al.
patent: 4234532 (1980-11-01), Motegi et al.
patent: 4370291 (1983-01-01), Kazama et al.

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