Converter Accessory: Contents

                                                 

About Us Products News Resource Center Customer Service Contact Us Register/Log In

Home >>> Tech Tip

Lighten the Load

There are many methods to supporting unwind and rewind roll cores in center driven applications. Air shafts, air chucks, mechanical chucks and core cones are the most common methods. Typically, air shafts are individually designed to support the full width of your widest roll and include journals designed to fit your machines bearing support.

Air chucks, mechanical chucks and core cones are core support methods that are more standard or off-the-shelf in nature. They are typically shorter in length than a full length air shaft and support the core of your unwind or rewind roll at its ends. These types of core chuck devices must be mounted via a temporary locking mechanism to a thru shaft and slid along that thru shaft to accommodate for varying roll widths. Once their proper position is determined on the thru shaft, they are locked in place to support the core. Engagement to the core is either through air inflation or mechanical locking.

The center or thru shaft is often times a solid steel shaft with ends designed to fit the bearing supports of the unwind or rewind shaft. One method to decreasing the weight of this support shaft is to manufacture it from hollow mechanical tubing. Beam strength of shafting comes mainly from the outside diameter. Some stiffness will be lost by making the thru shaft hollow but this is typically a very small amount. The weight savings compared to stiffness loss makes this option very attractive when considering ways of lightening the center shaft. Solid steel ends can be mounted and welded in place on each end of the hollow mechanical tubing to fit your unwind or rewind stand. Obviously, weight savings and deflection of hollow shafting versus solid shafting can be calculated for any individual application and determination of feasibility for your application can made.

Machine operators must handle whatever core support method your machine utilizes when roll changes must be made. Lightening the center shaft will ease this operation.



Jeff Damour, Converter Accessory Corporation
201 Alpha Road, Wind Gap PA 18091
800-433-2413




**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.

**Click here for CAC's terms and conditions**


RETURN TO TOP