Controlling Paper Qualities under Process Uncertainties, TAPPICon24

Papermaking process is full of uncertainties due to raw material variations, broke addition, production rate shifts, grade changes, control or process hitting limits, measurement uncertainties, and more.  Quality control based on the feedback control principle is generally used to stabilize paper qualities and drive them to desired targets through process models.  The process uncertainty, however, is an obstacle to achieving the designed control performance, and in some cases, it may even cause control instability.  

To deal with various uncertainties, one first needs to understand them.  Based on types of uncertainties, different tactics can be used.  This paper introduces several ways of dealing with process uncertainties and demonstrates these tactics with examples from paper mill applications. 

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