Abilities and inabilities of wound roll models to predict winding defects

Abstract

Wound roll models began appearing in the literature 40 years ago. These models predict internal stresses within wound rolls due to winder operating conditions and web material properties. The models have progressed much in their ability to model the complex properties of webs and winder type on the internal stresses. Defect models have also advanced but not at the rate of the wound roll models. The first objective of this paper is to establish the current state of wound roll and winding defect models that can be used to enhance productivity in web process machinery. The second objective is to establish what winding defects cannot be attacked with current models and why.