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

Page scan 000103 from Journal of the Society of Motion Picture and Television Engineers

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 #:
000103
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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20 30 40 50 DRYING TIME -SECONDS 60 Fig. 6. Impingement Drying of Eastman Curve Air Temp., °F Air Velocity, fpm Plus X Panchromatic Negative Safety Film, Type 5231. For satisfactory properties, final moisture should fall in shaded area. Required drying tune is determined by intersection of curves with dotted line at 50% R.H. 125 125 150 150 200 200 2,000 4,000 2,000 4,000 2,000 4,000 It is not the purpose of this paper to make a detailed mathematical analysis of the drier performance. However, a few general conclusions do seem to be warranted and may be helpful to others who may wish to construct this type of equipment. Effect of Temperature on Drying Time With any constant velocity of drying air up to 6,000 fpm, raising the air temperature from 125 to 150 F will reduce the required drying time about 50%. By raising the temperature from 150 to 200 F, the reduction in required drying time will be between 30% and 50%. These data are derived not only from that shown in Figs. 5 and 6, but also from experiments on a variety of other types of films. It was noted, and the two examples given are typical, that for nearly all positive films the reduction in required drying time by 94 February 1953 Journal of the SMPTE Vol. 60