Drying concentration of photographic emulsion coating by microwa

Details Drying concentration of photographic emulsion coating by microwa Drying concentration of photographic emulsion coating by microwa

1977-08-26

1979-04-17

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 18, 427 45, F26B 328

Patent

active

041493222

ABSTRACT:
A photographic emulsion coating on a travelling web 1 is irradiated by microwave energy propogated through a slotted, undulating waveguide 5 to condense or concentrate the coating by evaporating a significant percentage of its water content, thereby shortening the overall drying time for a given coating rate. A forced flow of air and/or other gases is established through apertures 9 in the waveguide under controlled temperature and humidity conditions, and the internal heating effected by the microwaves prevents the formation of a surface film which might impede subsequent drying.

REFERENCES:
patent: 2405813 (1946-08-01), Blanchard
patent: 3151950 (1964-10-01), Newman et al.
patent: 3403456 (1968-10-01), Smith, Jr.
patent: 3888681 (1975-06-01), Horie et al.

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