This is topic Rewind Table Tension ? in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by Ron Crookham (Member # 895) on 08-08-2001, 12:28 AM:
I was wondering how much tension to apply to the drag head of my kelmar rewind table. I'm afraid of damaging the film. Is there a rule of thumb?
Posted by John Pytlak (Member # 331) on 08-08-2001, 07:54 AM:
SMPTE Recommended Practice RP 106 specifies "Film Tension in 35-mm Motion-Picture Systems Operating Under 0.9 m/s (180 ft/min)". Film running over sprockets should never exceed 66.7 N (15 lbf), and should normally range between 1.7 N (6 ozf) and 4.4 N (16ozf). In rewind applications, excessive tension may cause the film to wind unevenly or have "spoking". Winding with too little tension produces a loose roll that may tend to cinch. In general, wind with the least tension that still gives an evenly wound "tight" roll.------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Eastman Kodak Company
Research Labs, Building 69, Room 7419
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion