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July, 1927
A Pneumatic
Film Squeegee
AMERICAN CINEM A T O G R A P H E R
Seven
" 1 Apparatus Outlined for Re
By J. I. Crabtree r . . . A c
d C E I moving Lxcess Moisture Af
ter Washing, Before Drying
Figure 1
Figure 2
1
Figure 3
(Communication No. 305 from Research Laboratory , Eastman Kodak Company , Rochester, N. Y.)
It is very necessary to remove all excess moisture from motion picture film after washing and before drying in order to prevent the possible formation of markings during drying.1 This is especially true if the gelatin coating of the film is abnormally swollen, which condition may exist in warm weather if the processing solutions are not kept at normal temperature, or if the film is insufficiently hardened either before or during fixation.
When developing motion picture film by the rack system it is customary to wipe the film with absorbent cotton, chamois, or sponge during transference to the drying reel,2 but this involves the expenditure of a considerable amount of labor and the gelatin coating of the film is liable to be scratched unless great care is exercised in the wiping process.
Excess Moisture The most satisfactory method of removing excess mois
ture from the film after washing is to impinge a blast of air on both sides of the film. Pneumatic squeegees for accomplishing this are in general use on processing machines but they have not been adopted by laboratories using the rack and tank system of development, owing o the non-adaptability of the conventional squeegee for this purpose.
A simple air squeegee having a single pair of air nozzles was first constructed and this produced good results, but it did not permit of leading the film on the drying reels sufficiently rapidly. The apparatus was modified by adding a second pair of nozzles working at right angles to the .first set and at a distance of about six inches away which permitted the film to travel at twice the speed.
Plan of A pparatus
A plan of the apparatus is shown in Fig. 1. The wet film first passes over a short wiping table T, over which a wad of wetted absorbent cotton w rapped around the