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Where to place an Idler Roll when guiding an Unwind and Rewind Stand?

When using an automatic web guide system on an unwind stand, where the unwind moves laterally, side to side, a lead-out idler roll MUST be included that moves with the unwind stand's motion. If this idler roll is not present in the control scheme, chances are the unwind will oscillate or "hunt" continuously, decreasing the accuracy of the guide and increasing your maintenance department's headaches. The web guide control's web detector (edge, line or centerline resolver) must be mounted AFTER the moving lead-out idler roller.

When using an automatic web guide system on a rewind stand, where the rewind moves laterally, side to side, a lead-in idler roll MUST be included that is stationary. This roller must not move with the rewind stand. The web guide control's web detector must be mounted prior to the stationary idler. In other words, the stationary idler roller must be mounted between the web detector and the rewind stand. The web guide system will continually oscillate if you do not maintain this control scheme. One more thing about guiding a rewind stand in this fashion; keep in mind, this is not a web guide system in the true sense of the phrase. This is really a chasing operation. In other words, you are not positioning the web where is it supposed to be in the process; instead, you are moving the rewind to wherever the web goes. You are in essence chasing the rewind to the web.





**DISCLAIMER - A great deal of time has been invested in the development of our weekly tech tips. To the best of our knowledge, they are accurate. It is up to the user to verify all results.

THE AUTHOR ASSUMES NO LIABILITY CONNECTED WITH THE USE OF THIS INFORMATION OR THE RESULTS OBTAINED FROM IT.



Converter Accessory Corporation
201 Alpha Road
P.O. Box 188
Wind Gap PA 18091-0188

Phone (800) 433-2413 or (610) 863-6008
Fax (800) 709-1007 or (610) 863-7818

sales@converteraccessory.com

www.converteraccessory.com


      
What is Web Handling?
Web Handling is the science, engineering and equipment necessary to successfully transport a continuous flexible material through various processes without defect. Enhancing Web Handling with proper equipment will ensure materials are processed at their maximum efficiency, allowing the process to generate maximum profits.

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