Abstract
A web is continuous flexible materials such as paper, plastic film, thin metal plates etc. Before being converted to the final product, the web undergoes several processes, for example, transportation by the drag roller, press, printing, coating, drying, slittering, winding, and so on. Under such processes, the web is given the additional values to enhance the quality and function of product. When the web wrinkles are generated in the handling processes, the wrinkles immediately result in quality loss. Therefore, to predict and protect the wrinkles is very important engineering problems in web handling industries. It is well known experimentally in the web handling industries that web wrinkles are generated due to misalignment of roller. Based on such experiences, several investigators successfully formulated the prediction model of wrinkles for isotropic webs with constant Young's modulus in machine and cross machine directions. However, some anisotropic materials such as paper and some optical films used for the Liquid Crystal Display have different Young's modulus in machine and cross machine directions. In this paper, observation method is presented for web wrinkling and the prediction model of wrinkling is proposed with experimental verifications.
