Stretching of polyethylene terephthalate films

Details Stretching of polyethylene terephthalate films Stretching of polyethylene terephthalate films

1978-10-12

1980-12-02

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Disparate treatment of article subsequent to working,...

Effecting temperature change

2642902, B29C 1702

Patent

active

042370884

ABSTRACT:
Biaxially oriented thermoplastic films, for example polyethylene terephthalate films, are further stretched in one direction in a stretching zone having a distance in the direction of stretching which is greater than the breadth of said film. As a result, stretched films having a uniform thickness in the breadthwise direction are obtained in a high yield rate.

REFERENCES:
patent: 2547763 (1951-04-01), Land et al.
patent: 3076232 (1963-02-01), Dengler
patent: 3177277 (1965-04-01), Adams et al.
patent: 3257489 (1966-06-01), Heffelfinger
patent: 3869533 (1975-03-01), Janocha et al.
patent: 4134957 (1979-01-01), Yoshimura et al.

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