Flat photographic film produced by heating above the second orde

Details Flat photographic film produced by heating above the second orde Flat photographic film produced by heating above the second orde

1973-11-21

1976-02-17

Husack, Ralph

Gas separation: apparatus

Electric field separation apparatus

Electrode retaining or supporting means

427171, 427209, 427374, 427385, G03C 180, B29C 2500

Patent

active

039390004

ABSTRACT:
A process for producing flat sheets, particularly photographic sheets for use in automatic film changing equipment, from a stored roll of material. A thermoplastic film is briefly heated to above its second order transition temperature but not over 120.degree. centigrade prior to cutting for packaging. Such heating removes roll curl developed during storage of the film in rolls, without adversely affecting the quality of the film.

REFERENCES:
patent: 2779684 (1957-01-01), Alles
patent: 3526695 (1970-09-01), Spencer
patent: 3565669 (1971-02-01), McDermott et al.
patent: 3751280 (1973-08-01), Nerurkar et al.
patent: 3777002 (1973-12-01), Suzuki et al.
patent: 3814617 (1974-06-01), Kasugai et al,
patent: 3834928 (1974-09-01), Tatsuta et al.

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