Improper Web
Release
When the web adheres, or sticks to the roll surface, it can pick
off coating from the web or cause tension fluctuations and web marking.
The most common solution to this problem is to increase the release
characteristics of the roller. This can be achieved by decreasing
the surface contact area of the roller and/or using special coverings,
such as high release plasma, ceramic coatings or silicone rubber
coverings on the roller surface.
A good release surface will eliminate or reduce coating buildup
on the edge of the roll and also facilitate roll cleanup. For example,
a plasma-coated roll lets operators easily peel off accumulated
coating on the roll's edge. Rolls cleaned right on the line don't
have to be removed for soaking and cleaning. Be aware that any coating
buildup can also affect the balance of the roll.
Should you want to move or turn a coated or sensitive web without
any roller contact whatsoever, an air turn may be the ideal solution.
Here the web travels on a controlled blanket of air emitted from
the air turn. Contact a Webex applications engineer to discuss your
air turn application.
|
