BEST PRACTICES FOR MAINTAINING QCS SCANNING SYSTEMS AT PRISTINE CONDITIONS, PaperCon2017

For most of sheet-making processes, online quality measurement and control systems (QCS) are critical equipmentfor papermakers to achieve intended sheet qualities and to optimize production throughput. In QCS systems,arguably, the most crucial mechanical systems are the scanners that carry various sheet quality measurement sensorsand traverse over running sheets continuously during production. The precision of sheet quality measurements isdirectly associated with the operational conditions of scanners. QCS scanners typically operate in a very harshenvironment. Improved ruggedized scanner designs have enabled QCS scanners to operate on a machine for manydecades. It is critical that scanners work continuously and precisely during their operating life span. To maintain aQCS scanning system at its original pristine condition takes specialized skills, tools and experiences. In this paper,we address the potential issues faced with many QCS scanners, the analysis methods that can be utilized to evaluatethe conditions of scanning systems, and the best practices to keep QCS scanners operating at this pristine condition.

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