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spraying devices are sold by the American Moisture Company, Boston, Mass. and the Bahnson Company, Winston-Salem, N. C.
In case a water veil is installed the brine supply should not be adjusted for the worst conditions, but for the average bad day. With such a system clean air is delivered at a constant temperature and relative humidity but unless a separate unit is installed for the drying room, the air pipes for this room and the printing room should be fitted with steam jets and air sprays as above, so that the humidity of these rooms may be increased.
Removing Film from Drying Reel.
Providing the film is thoroughly dry it may be removed from the drying reel by winding on a rewinder which slides along a bar parallel with the reel. It is good practice, however, to feed the film from the drying reels into fiber baskets lined with canvas which should be kept clean. By allowing the film to lie in the baskets before reeling, any residual moisture is given an opportunity to evaporate.
Drying Troubles
1. Buckle is characterized by waviness along the edges of the film and is caused by rapid drying when the film is under tension. A rapid change in the rate of drying also causes local strains in the film and on projection the image goes in and out of focus wherever the strain occurs. Buckle may be prevented by slow drying, and taking care that the film is not subjected to tension during drying. Buckled film may often be restored, especially when fresh, by rewinding the film on the drying reel and allowing to stand for an hour or more in a very humid atmosphere. Resoaking of the film in the wash tanks and redrying often effects a cure.
2. Brittleness is a result of drying film in an atmosphere whose relative humidity is too low. As explained above the dry gelatine film must contain about 15% of moisture in order to retain its flexibility and this can be insured by drying under the conditions outlined above. Bathing the film in a 1% solution of glycerine after washing and then rinsing for 2 or 3 seconds before drying will lessen the tendency for film to lose moisture after it is subsequently exposed to a dry atmosphere after leaving the laboratory. Excessive hardener in the fixing bath or the use of strong solutions of formalin for hardening tends to increase brittleness. Brittleness is therefore largely a matter of the dryness of the gelatine coating, although the film base itself contains a certain percentage of natural moisture, and this must be retained if its flexibility is to remain unimpaired. See also booklet "Toning and Tinting of Eastman Motion Picture Film."10
3. Dust. In order to prevent dust spots the air supply should be filtered thoroughly either by filter bags or a water veil. By keeping a fairly high positive pressure in the drying room the tendency for dust to enter through the windows or crevices will be a minimum. The drying room walls should preferably be of glazed title in order to facilitate cleaning. Oil paint should be used wherever necessary and not water paint.
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