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March 28, 2006
Long Spans at Unwinding
Unwinding rolls are seldom perfect. They are lumpy, eccentric, and out of alignment. If you handleds your web over rollers with these properties, you'd have wrinkles city.
What to do?
The simple solution is to have a relatively long span from the unwinding roll to the first roller. This demagnifies the problem. A 0.1" runout over 50 inches is a smaller upset than the same runout over a 10 inch span.
Posted by Tim Walker at March 28, 2006 03:34 AM
