Analysis of a Nonlinear Web-Tension Control System of a High- Speed Gravure Printing Machine

Large printing demand of our modern society requests development of high-speed printing machines. A reasonable model for Web tension plays an important role for the development of a high-speed printing machine. In this paper, we derive a nonlinear Web-tension model of a high-speed gravure printing machine considering span length to be time-varying instead of considering it to be fixed. Time-varying property of the Web span length is due to turret motions of unwinding and rewinding units as well as dancer motions. Furthermore, we analyze Web-tension control performance at transient and steady-state operations. The validity of the Web-tension model and control system has been shown via simulation study