CONTROLLING WEB TENSION BY ACTIVELY CONTROLLING VELOCITY OF DANCER ROLL

摘要

This invention pertains to processing continuous webs such as paper, film,composites, and the like, in dynamic continuous processing operations. Moreparticularly, it relates to controlling tension in such continuous websduring the processing operation. Tension is controlled in a dancer controlsystem by connecting a corresponding dancer roll to a servo motor or thelike, sensing position, tension, and velocity parameters related to the weband the dancer roll, and providing active gain force commands to causetranslational movement in the dancer roll to control temporary, short-termtension disturbances in the web. In some applications of the invention, thedancer control system is used to attenuate short-term tension disturbances.In other applications of the invention, the dancer control system is usedto create short-term tension disturbances.