Abstract
Thin and flexible materials such as plastic film are called Web. The Web is produced on roll to roll system. It is often stored or transported as a wound roll, and it is placed in a different ambient temperature after winding. Then the internal stress will change with roll temperature change. If the internal stress of a wound roll is sufficiently altered, defects such as slippage or wrinkling are generated. For the problem, it is extremely important to theoretical estimate the internal stress. Therefore, analysis of thermal stress and experimental verification are done. However, in Web material to which Plastic film occupies the majority, thermo-viscoelastic property of the film is unable to ignore. In this study, a winding model for prediction of the internal stress, considering thermo-viscoelasticity is presented and experimentally verified. As a result, measurements of internal stress are well accorded with the winding model
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