Abstract
Plastic films are produced on roll to roll systems. The film products are wound in the shape of a roll for the sake of store and transportation. As environmental temperature changes during the store or transportation, internal stress of wound roll will be changed over time. If the internal stress of a wound roll is sufficiently altered, defects such as slippage or wrinkling are generated. This paper describes optimization method of winding tension for preventing the wound roll defects under unstable environmental temperature based on the optimum design technique which is published by Hashimoto. In the analysis of unsteady thermal stress, the calculations are carried out by simultaneous equations that variables are heat conduction and radial stress. As a result, the optimized tension provides very much improvement of in-roll stress distribution for preventing defects under several temperature environments.
