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

Page scan 000467 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 #:
000467
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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Fig. 2. Coating machine. added smoothness attained by this operation can gain as much as 2 db in output level, particularly at high frequencies, because of better contact between the coating and the record-reproduce heads. This operation as well as the simultaneous application of the lubricant helps to eliminate the abrasive action of these coatings and reduce headwear. Slitting The next operation is the slitting of the wide rolls on rotary-knife slitting equipment. Such a machine is shown in Fig. 4. While accuracy of slitting is of para mount importance, control of take-u ! tensions is even greater. From th>j manufacturers' standpoint, it would b desirable to spool under reasonably hig tension to insure a tight, readily ship, pable and neat wind. From the ultij mate users' viewpoint, however, such i ! not the case. The best currently manu; factured plastic-base materials exhibiexpansion and contraction character J istics of about 0.5% between the exi tremes of temperature and humidity nor j mally encountered where tape is used Even if the tape is originally wouncunder carefullv controlled humiditv anc 458 April 1953 Journal of the SMPTE Vol. 60