Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1990-08-29
1991-07-16
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34 23, 34157, 34160, 34161, F26B 1308
Patent
active
050313398
ABSTRACT:
Photographic film is dried in a film dryer having a pattern of film guide rollers inside a hollow drying chamber contained in an outer drying housing. A continuous film strip is passed through the chamber and around the rollers so that long lengths of the film between adjacent sets of guide rollers pass through the chamber in substantially parallel directions for exposure to warm drying air passing through the chamber. A supply of warm air is introduced into a supply plenum contained in the housing on one side of the guide rollers and a similar exhaust plenum is contained in the housing on the opposite side of the rollers. The supply plenum has a pattern of inlet openings arranged so that supply of warm air in the plenum is directed into the chamber to flow adjacent to and substantially parallel to the lengths of film supported on the rollers sufficiently to dry the film before it exits the housing. Air is withdrawn from the exhaust plenum after the air has flowed past the lengths of film. The parallel pattern of airflow through the chamber is controlled so that airflow is smooth past the lengths of film. The parallel direction of airflow through the chamber inhibits dirt particles contained within the chamber from impinging upon the emulsion surface of the film as the film dries in the chamber.
REFERENCES:
patent: 1281711 (1918-10-01), Thompson
patent: 2101301 (1937-12-01), Wellmar
patent: 2289615 (1942-07-01), Williams, Jr.
patent: 2884706 (1959-05-01), Svavar
patent: 4151657 (1979-05-01), Jensen et al.
patent: 4711040 (1987-12-01), Hatta
patent: 4800656 (1989-01-01), Brosch
Bennet Henry A.
Kilner Christopher B.
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