Influence des propriétés surfaciques et volumiques des bandes flexibles lors de leur déroulement-enroulement

The handling of materials such as textiles, paper or metal is often processed with webs on rollers with unwinding-winding systems. The quality of the final product depends mainly on the ability of the system to control web tension and speed. This issue is difficult because of the high coupling between these two variables. Moreover, unwound roll changes are usually carried out while the process continues at a constant velocity. Accumulators which are moving mechanisms are generally used to store and bring back the web during this operation. The influence of the web mechanical behavior will be pointed in this paper. As the elastic properties are essential to achieve good control performances, they have to be known a priori or determined online. Some solutions are available. One of them is the addiction of a sensor whose data can be used as an input of the controller. Another approach deals with the use of dancer mechanisms for web tension regulation.