FORCE MEAUREMENTS FOR COATING AND PRINTING WEBS, Papercon 2014

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The forces that a paper web experiences during coating or printing are critical to understand for good design and operation of coating or printing processes. While it is routine to measure ink tack values with various devices, it is not well understood what parameters determine the magnitude of the tack value. Others have recorded the pressure distribution in a lab scale printing nip for cases of printing a continuous layer. However, little is understood for patches of inks that are contacting a deformable web as typically encountered in offset printing where ink is transferred from the blanket to the paper surface.