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1950
SIMPLIFICATION OF PROCESSING METHODS
15
through numerous narrow slits, each covering the width of the film strand. Pressure is maintained in the plenum by a blower whicri takes air from the vicinity of the film strands and fresh air from a dampered intake pipe. Air leaving the blower flows through the thermostatically controlled heater and then enters the several sections of the plenum.
The slits or groups of orifices should be spaced in such a way that the film in each strand passes them at a rate of 15 or more a second. Air velocities should be upward of 100 fps. The dimensions of the openings will depend upon the supply pressure. The total volume of air necessary for drying Eastman Fine Grain Positive Film at 120 F will be of the order of 75 to 100 cfm, measured at atmospheric pressure.
The essential feature of the cabinet as well as of the drum design is the frequent sweeping of the emulsion surface by forcible streams of unsaturated warm air. During the 5 sec the film is in the drum dryer, the force of the air blast is so great that the film must be supported rigidly at all times.
Side
Film (Door Removed) entering
—*. indicotes surfaces having orifices
Fig. 6. Cabinet-type rapid filmdryer employing numerous jets of high-velocity, heated air.
When 10 to 20 sec of time are available, sufficient support may be provided by a few backing rollers or by balancing air jets applied to the film support.
By the use of the methods and equipment discussed here, the requirements of theater television and the like for simplified, automatic processing of Fine Grain Release Positive Film in a restricted space can be met. Depending upon the requirements for quality and permanence in a given case, the time of processing, including drying, may be reduced below the 25 to 40 sec employed in the practice described here.
USE IN MOTION PICTURE LABORATORY
At present, rapid processing equipment might be adopted in commercial laboratory work because it requires less space and entails smaller capital outlay than conventional equipment. Justification