Film thermal processing

Details Film thermal processing Film thermal processing

1975-07-14

1977-01-04

Albritton, C. L.

Electric heating

Heating devices

Combined with diverse-type art device

219388, 432 60, 432228, H05B 100

Patent

active

040015467

ABSTRACT:
A fixed drum has input, output and developing segments of aluminum to provide a cool input and output segments thermally separated from a heated developing segment maintained at substantially constant temperature. The film to be developed passes beneath a wire at high electrical potential relative to the drum to receive charge from a corona discharge that produces electrostatic forces securing the film to an endless belt that carries the film around the drum wrinkle-free. A pair of input rubber drive rollers drive the belt around the drum. The film to be processed is placed on the belt between the drive roller and drum. An output pair of metal rollers partially drain the charge from the developed film and belt and guide the film toward the exit slot. The inner surface of the belt is electrically conducting low friction tetrafluoroethylene to allow the belt to move freely around the stationary drum. The belt outer surface is silicon rubber which may be impregnated with carbon.

REFERENCES:
patent: 3397630 (1968-08-01), Pratt, Jr.
patent: 3478665 (1969-11-01), Umahashi et al.
patent: 3628440 (1971-12-01), Czarnikow et al.
patent: 3666247 (1972-05-01), Banks
patent: 3893800 (1975-07-01), Wako

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