Optimization of winding conditions for preventing roll defects caused by thermal-viscoelastic property and experimental verification

Abstract

Plastic films are used in many high functional products. They are produced on roll to roll system. The films are continuously wound in the shape of roll using this system. The wound roll is shipped to the store and transportation, in some cases, heat-treated under the various temperatures. Then internal stress of wound roll will be changed due to thermal strain and viscoelastic properties over time. Those factors causes to wound roll defects such as slippage or wrinkling. This paper describes optimization method of winding tension for preventing the wound roll defects by thermo-viscoelastic property based on the optimum design technique. As a result, the optimized tension is confirmed experimentally that the internal stress distributions are very much improved for preventing both wrinkling and slippage.