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Grooved rolls performance can be very limited for removing wrinkles. In fact, some webs will conform to the grooves profile and wrinkles and web distortions will result.
Concave profiled rolls are sometimes referred to as reverse crowned rolls due to the fact that they have a profile exactly opposite crowned rolls. The rolls diameter is greater towards the edges and less in the center. The larger diameter towards the rolls edges will "walk" the webs edges away from the center (assuming the web is in traction with the reverse crown roll face). This will help to eliminate wrinkles.
Try it with one roll and see what your experience tells. If the concave profile works well for you, then often times adding this profile to several rolls in your machine yields the best result.
**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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