High Shear Rheology Management for Proper Control of Coating Processes and Coater Runnability, 2021 TAPPICon Live (21TAPL)

Market demand for coated printing papers has declined consistently due to electronic media. However, other coated grades, such as coated board, barrier-coated packaging papers and different specialties, are forecast to continue growing. In spite of the actual market situation, the operational environment and coating functionalities are under continuous investigation. In addition to base paper and machine parameters the flow properties (rheological factors) of the coating color play an important overall role in optimizing runnability and quality. This paper demonstrates the importance of rheology and viscosity in paper and paperboard coating. The focus is on high shear viscosity that has been demonstrated to be a critical parameter affecting coater runnability. Its importance will be discussed from both theoretical and practical standpoints.  

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