Abstract
Plastic film are widely used for a lot of products, such as liquid crystal display monitors, lithium-ion secondary battery, and other high functional flexible materials related in the printed electronics fields. These devices re manufactured by web handling system (Roll-to-Roll system). Most of web handling industries are often encountered with the problems of wrinkling, slippage and gage band in the wound roll. Since the winding process is a final stage of the production, these web defects had been a cause of losing a lot of materials and being very high production costs, and wasting a lot of time to restore the wound roll. Recently, gage band which is a permanent strain occurring when there is thickness variation of the film across widthwise direction. Moreover, gage band is strongly related with the internal stress (radial stress) distributions in the wound roll. Therefore, in this study, internal stress was measured using a film with thickness variation. As a result, the tendency of internal stress distribution was similar to the thickness variation of the film.
