Simulation-based Control of the Sizing Rate of Resin Sized Paper

摘要

Because of the complex interactions involved in resin sizing, there are still no mathematical algorithms available to adequately describe the process, even though its basic mechanisms are fully understood. Pa-permakers continue to rely on their vast experience or trial and error procedures to control one of the papermaking operations that determines many important product characteristics. Carried out jointly by PTS, Drewsen Papier and other partners, the DOTS research project funded by the European Commission has led to a major breakthrough in this area. The main tasks of the project were the acquisition of data forthe development of a softsensor, design and construction of the sensor, and its practical application for resin sizing control. An initial brainstorming was aimed at identifying the parameters governing resin sizing. Next, these parameters were measured within the framework of comprehensive process analyses. The information obtained-i.e. stock and mass flow data of the PM as well as the dynamic process data required for modelling and sensor design - was processed via a DDE/OPC interface for further evaluation, and verified through comprehensive mill trials. To identify the key influences on sizing results, the data was analysed using several different correlation methods. The parameters determined were then combined with the trial results to derive a closed process model - which turned out to be the most challenging task of the project The last step was the validation of the model. The authors describe the principal findings from the PM trials, present and evaluate the model derived, and venture an outlook for the future availability and practical applicability of online control parameters for resin sizing.