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December 01, 2006
Nipped roller + thickness variations = meandering?
Contributed by Tim Walker:
Question:
When I have web thickness variations, I see meandering at my nipped drive roller. How do I prevent this?
Answer:
Two things with nipped roller I almost always recommend will reduce this problem. First, make sure the web wraps one of the two rollers at least 20-30 degrees before reaching the nip contact point. Second, keep the span length ahead of the nip short. The web wrap and traction it creates between the web and roller will help to isolate the upstream span from the nip force variations. The short span will be stiffer than a long span and have less meandering for the same stress variations.
Posted by Tim Walker at December 1, 2006 08:00 AM
