Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2023 - September 06, 2023
Web is a generic term for thin, flexible, continuous material such as plastic film and metal foil. The R2R production method is used for web production. In this system, a lot of rollers support and transport the web from the unwinding to the winding. In this production system, the winding section is the most important process that determines the quality of the web. Inappropriate winding conditions are winding defects such as slippage and wrinkles can occur. Slippage and wrinkles are situations where changes in interlaminar frictional forces and tangential direction stresses suggest winding defects. In recent years, webs have become increasingly multilayered, thinner, and more precise. Therefore, web thickness variation more likely to occur. Thickness variation causes a difference in the internal stress in the web width direction due to the change in contact area between the web layers. Therefore, quality of the web may be affected. A theoretical prediction model that considers thickness variation is the winding model proposed by Hakiel that considers thickness variation in the width direction. This winding model is assumed to exist only in the web width direction, it is possible to prevent winding defects by calculating the internal stresses of the winding rolls. However, the actual web has thickness variation in the transport direction. Therefore, in my study, the web roll internal stresses were compared with the theoretical prediction model. As a result, the need to account for thickness irregularities in the transport direction was confirmed.
