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Calculation of the proper coefficient of friction for your tension brakes is critical to success

Air operated tension brakes utilize friction pads or similar device for delivering torque to an unwind shaft. These friction pads are usually available in a selection of friction coefficients. It is extremely important the proper coefficient of friction is used in your unwind application to properly control tension.

The torque requirement for your unwind is equal to:

  • Minimum web tension X core outside diameter / 2 = Minimum torque requirement
  • Maximum web tension X roll outside diameter / 2 = Maximum torque requirement

Your unwind brake should be the proper size to accommodate your required tension range (minimum to maximum) AND the friction pads must be the proper coefficient of friction to provide your required tension range.

If the brake you are currently using doesn’t give you proper tension control at the "low end" - try using friction pads with lower coefficient of friction. Conversely, if your unwind brake doesn’t supply enough torque at full roll - try using friction pads with higher coefficient of friction.




**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
PO Box 188
Wind Gap PA 18091-0188

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

sales@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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