This is a roller effective for smoothing out wrinkles in film. It reduces defects caused by wrinkles!
■Wrinkles Occurring During Film Production The equipment used for producing and processing films is equipped with numerous rollers. If the parallelism between the rollers is not maintained, a difference in tension occurs in the width direction, resulting in diagonal wave-like wrinkles (troughs) in relation to the direction of the substrate's movement. Additionally, when transporting thinner films, if the transport tension is set to a level similar to that of thicker films, the film stretches in the transport direction, causing wave-like wrinkles parallel to the transport direction. These wave-like wrinkles can create fold wrinkles when passing through the rollers, significantly reducing the product value of the film. ■Reduction of Wrinkles Using Concave Rollers Concave rollers are rollers with a reverse crown shape, where the center is narrower and the ends are thicker. Compared to the center, the outer diameter increases towards the ends, resulting in a higher peripheral speed. The film tends to move towards the ends where the peripheral speed is higher. Additionally, the film has a tendency to enter the downstream roller axis at a right angle. These two effects cause the film to widen, thereby reducing wrinkles.
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basic information
We can propose the optimal amount of concavity. - Roller size - Distance between the upstream roller and the path - Base material width - Amount of widening (how much you want to stretch) Designs can be made for both rubber and metal rollers. Additionally, we can suggest installation locations based on the roller layout diagram. Please feel free to contact us.
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Applications/Examples of results
■Achievements with Guide Rollers As a measure against wrinkles during transport, by installing them on rollers before processes such as laminating or coating, it allows for processing with uniformly applied film that has no sagging or wrinkles, contributing to quality improvement. ■Achievements with Near Rollers (Guide Rollers) By installing them on near rollers before film winding, it is possible to supply film from the touch roller to the winding machine in a clean state, demonstrating high effectiveness in improving winding appearance. ■Concave + Micro Grooves on Guide Rollers When concaves are installed on lines with high-speed transport, the film slips on the roller, causing it to fold and create wrinkles (buckling) in the center. As a countermeasure, improvements are made using concave + micro grooves.
Detailed information
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Compared to the central part, the peripheral speed increases towards the ends due to the difference in outer diameter. The film has a tendency to move towards the ends where the peripheral speed is higher.
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It is effective to install it on the long downstream roller between the passes.
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Founded in 1899 in the Nishi Ward of Osaka City, our company has walked alongside the 20th century. In recent years, with the remarkable development of electronic technology and the rapid diversification of information media and surrounding environments, we believe it is our responsibility to accurately respond to the new demands of the times and the true needs of our customers.
