Robust Sheet Tension Estimation for Paper Winders

This paper proposes and evaluates two robust sheet tension estimation algorithms based on unwind and rewind variables, respectively. The proper sheet tension estimation is guaranteed by a continuous monitoring of the differences between the actual estimated values and the values predicted from the last calibration of the estimation parameters. The evaluation was performed with the aid of a developed winder emulator that allowed the off-line testing in a real-time field environment, including the inertial setting of the estimation constants, and evaluation of both 4 and 6 shipping-roll cycles. The sheet tension estimation results confirm the precise and stable operation of the proposed robust estimation algorithms, in estimation tests conducted with signals from a winder model, and with tests involving actual field signals from an operational winder.