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Whether using an air shaft, air chucks or core cones; don't let your cores slip. Excessive dust, core damage and improper web tension control will result if cores are allowed to slip on their support mechanism. Cores will slip if the torque requirement to maintain proper web tension is greater than the torque the air shaft, air chuck or core cones are able to supply to the core inside diameter.
Suppliers of core holding devices like air shafts, air chucks, mechanical chucks and core cones should have a good estimate as to the maximum torque their devices can supply to a standard cardboard core. Keep in mind, this is just an estimate because the actual maximum torque delivered to the core inside diameter will vary depending on each cores coefficient of friction between the core inside diameter and the core holding device. Core hardness, smoothness and composition vary for cardboard cores and so does the coefficient of friction with a core holding device. Also, if you use metallic or plastic cores, torque transmission will be less than cardboard, which may cause cores to slip on the core holder.
The torque required for an application is a function of web tension, roll width and material roll diameter. You should know these specifications in order to calculate whether a specific core hold devise will positively grip the core inside diameter and resist core slippage.
A good calculator of torque, horsepower and RPM can be found here: https://www.converteraccessory.com/ss/index.php (free website registration / login required)
**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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