Adaptive control of linear velocity and tension in winding system of dry plastic film laminating machine

Based on the control principle of the dry plastic film laminating machine, and the linear velocity synchronization and variable tension control in the winding process for the two-layer film laminating machinery, this paper presents the system modeling and a new winding drive system using an AC torque motor. Due to the wide range variation of the web radius, the set point of the film tension needs to be changed during the winding process. The tension algorithm is shown to render the control more robust to the radius variations, and the operating voltage of the torque motor is adjusted according to the set point of the linear velocity and the film tension. This makes the mechanical property of the AC torque motor favorable to the winding system, for the adaptive control of linear velocity and tension. The controller chooses a high-speed micro-controller and SCR as its core components. From the applications on the 600mm and 1000mm width dry plastic film laminating machine, it is confirmed that this adaptive control system shows a satisfactory performance.