Method and circuit for predicting and regulating a paper winding parameter in a paper winding device

Abstract

When winding a paper web, in order to achieve a constant reeling layer thickness, which represents a significant quality parameter in the production process of paper, the line force or the web tension of the paper is corrected as an influencing force. Using measurements, the relationship between force and layer thickness is determined and used to set a controller. In winding devices, winding from the parent reel generally takes place on a winding station, so that the invention makes use of the relationship between the winding and unwinding operation to the effect that the change in the layer thickness is measured and these measured values are used to train a predictor. In continuous operation, in order to regulate a paper winding device, a measured variable which can be registered is measured, and this measured variable is used to determine the layer thickness change or another correlated quality parameter. In order to compensate for the dead time which arises as a result of the measurement, the predictor is supplied with the specified quality parameters and predicts precisely that variable which will result after the dead time has elapsed, so that in relation to the measurement, the predicted value corresponds to the actual measured value. This variable is used to form the control difference and is fed to the controller, which calculates from it the correction force with which the actual desired influencing force of the paper winding device is corrected.