Heat-setting process for polyester film

Details Heat-setting process for polyester film Heat-setting process for polyester film

1976-01-08

1977-08-16

Lowe, James B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

264235, 264289, 264346, C08G 6312, B29D 724

Patent

active

040425690

ABSTRACT:
Improvement in a two-stage heat-setting process for asymmetrically, biaxially oriented polyester film wherein the film from the second heat-setting stage is heat set a third time and quenched. The starting film can be oriented by a transverse direction-machine direction sequence of drawing or a machine direction-transverse direction-machine direction sequence. The film can be machine direction drawn again after the second heat-set stage and relaxed an equal amount after the third heat-set stage. The film has improved dimensional stability in the transverse direction without a substantial loss in tensile strength at 5% elongation in the machine direction.

REFERENCES:
patent: 2517570 (1950-08-01), Irons
patent: 2603838 (1952-07-01), Lowry et al.
patent: 2779684 (1957-01-01), Alles
patent: 2812550 (1957-11-01), Chavannes
patent: 2884663 (1959-05-01), Alles
patent: 2995779 (1961-08-01), Winter
patent: 3177277 (1965-04-01), Adams et al.
patent: 3461199 (1969-08-01), Campbell
patent: 3669931 (1972-06-01), Annis et al.

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