Comparative Study Between a New Verity Topography Measurement Device to Parker Print Surf and Emveco Instruments Evaluating Base Sheet and Subsequent Air Knife & Blade Coating, and Calendering, 2007 TAPPI Papermakers and PIMA International Leadership Con

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Three instruments designed for the measurement of base sheet smoothness, roughness, and topography were evaluated in their ability to predict the surface characteristics of the same base sheet when coated using air-knife and blade techniques and subsequent calendering. To control data point matching the base sheet was marked, and measured in thirty measurement areas, before coating and measured again in the same areas after coating, and again after calendering. Data presented demonstrates correlation of the instruments and results as a process quality control to predict subsequent performance on coater and calendering at 600 pli and 1200 pli.