Process for producing polymeric film

Details Process for producing polymeric film Process for producing polymeric film

1974-01-09

1976-03-16

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Forming continuous work followed by cutting

264210R, 264216, 264237, 264289, 264DIG73, 425445, 425DIG53, B29C 2500, B29D 724

Patent

active

039446441

ABSTRACT:
Polymeric film is stretched by pulling the film over a first roller which is heated and over a second roller which is cooled, the second roller rotating at a greater peripheral speed than the first roller. The necking-in of the film in the gap between the two rollers is considerably reduced if a heat-transfer liquid is applied betwen marginal portions only of the film and the corresponding peripheral portions of the second, cooled, roller.

REFERENCES:
patent: 2000079 (1935-05-01), Herndon
patent: 3261903 (1966-07-01), Carr
patent: 3816886 (1974-06-01), Van Cappellen

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