Journal of the Society of Motion Picture and Television Engineers (1950-1954)

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
000102
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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10 20 30 40 50 DRYING TIME SECONDS Fig. 5. Impingement Drying of Eastman Curve Fine Grain Release Positive Safety Film, j Type 5302. 2 For satisfactory properties, final moisture 3 should fall in shaded area. Required 4 drying time is determined by intersection 5 of curves with dotted line at 50% R.H. 6 Air Temp.: 125 125 150 150 200 200 Air Velocity, fpm 2,000 4,000 2,000 4,000 2,000 4,000 the curve shape reverses, indicating a transition, and the final part of the curves are in the falling-rate phase. Calculation of these data has shown that the first part of the drying cycle is not actually at constant rate. This is not surprising because drying of the support is limited by the rate of diffusion of water through the support, which is a falling-rate type of drying. At the same time, the emulsion is probably being dried at almost constant rate. Because the amount of water being evaporated from the emulsion during this phase is so much greater than that evaporated from the support, the combination of the two approximates constant-rate drying. As the drying of the emulsion progresses, the rate at which water can migrate to the surface of evaporation becomes less than the rate at which it can be evaporated and the drying of the emulsion as well as the support is done at a falling rate. F. Dana Miller: Rapid Film Drying 93