Roll Defects
Web marking is readily caused by flaws in a roll or drag in a roller
when a roll is not turning up to speed. A repetitive mark is likely
caused by a spot defect in a roll. A streak normally comes from
roll drag or a circumferential defect in the roll. A repetitive
streak or blemish may also come from the roll scuffing the web as
air entrapment or web tension fluctuates.
Rolls not spinning up to speed due to air entrapment or poor bearing
performance can cause web marking. If a roll is not spinning up
to speed, check for air entrapment or poor bearing performance.
A lighter weight roll may also be a simple solution, or consider
a rubber-covered roll for increased traction.
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