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All cantilevered air shafts deflect a certain amount. The amount of deflection can be determined by running through common calculations generally used for cantilevered beams. You can also use this online calculator to approximate deflection: http://www.converteraccessory.com/ss/case10.htm
The effect of deflection on your process is similar to the effect of skewed rolls and rollers. Web tracking problems and web wrinkling may occur if air shaft deflection is a large amount.
The amount of deflection your web and process can tolerate depends on the types of webs you run. As you can imagine, thinner, flimsier material like very thin plastic films can tolerate very little deflection before wrinkling and other web handling issues occur. While thicker papers can tolerate a much larger amounts of deflection before having web handling issues.
In order to minimize deflection, make sure shafts, journals and bearings are designed with the largest diameter possible. The larger the outside diameter of shafts and journals, the stiffer the air shaft will be and less deflection will occur.
**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.
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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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