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The inhomogeneous mass distribution of coated papers causes temperature patterning on the web during drying. We used rapid infrared thermography to record two-dimensional real time web temperature snapshots on a running pilot coating machine. The coat weight distribution was calculated from the temperature field by a new point-by-point simulation of the drying process. We assume that this simulation technique will allow the prediction of the drying process heterogeneity after coating, depending on the drying strategy.
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Measurement of Coat Weight Distribution by Rapid Thermography, 2004 Coating and Graphic Arts Confere