The web enters a downstream process with errors from upstream causes.
(Note: In sensing or observing only one edge, it may be difficult to distinguish between CD shifts and web width change without observing the other edge simultaneously.
The web shifts to left or right versus centerline in the span between rollers.
(Note: CD shifting relative to a CD position could be caused by CD shifting or width change.)
The web edges shift towards the machine centerline in the span between rollers.
CD slipping/shifting on rollers is a change in the web’s lateral position during the contact wrap angle.
Note: One benefit of webs slipping laterally on a roller – No wrinkles due to lack of friction.
Layers within a winding, wound, or unwinding roll are not aligned to each other or the core.
Timothy J. Walker
President / Web Handling Specialist
4452 41st Avenue South
Minneapolis, Minnesota 55406
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