Prevention of wound roll defect of coated web

Abstract

The web which is coated with a coating agent on the surface to add a function is called coated web. This coated web is often made into wound roll to ease handling and storage after coating, and then it is passed to next the manufacturing process to convert to a final product. However, if winding and unwinding tensions are inappropriate, wound roll defect which leads to the function degradation could occur. It is a method to generally adjust the tensions to prevent the wound roll defect. The adjustment has often been through a trial and error process that might lead to loss of time and cost. In order to cut them down, our work is to establish the technology to determine adequate winding and unwinding tensions efficiently through prediction of radial stress and slippage condition within wound roll. In this study, a release paper which is coated on a base paper with a release agent, has an easy peel-off property for pressure-sensitive adhesive (PSA) label is used as an example of coated web. We show one of the efficient methods determining the tensions to prevent the wound roll defect which causes the function degradation that leads trouble during a set of labeling process of PSA label. Additionally, the applicability of the method is showed by experimental verification.