Prediction of forces on paper during half tone dot printing, 2012 Advanced Coating Fundamentals Symposium

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During offset printing, delamination of the paper or paper coating can occur leading to serious print defects and press operation issues. A number of publications have reported “tack” forces that are measured during the printing of a solid region. However, there are limited reports on forces during halftone dot printing and limited theoretical work.

The forces generated as a fluid cylinder is squeezed and extended as it passes through a nip are predicted based on lubrication analysis and a commercial finite element code. A set of dimensionless parameters are established for this printing event. The influence of process variables such as ink rheology, printing speeds, ink dot dimensions, roughness, and non-Newtonian behavior are predicted. Extensional properties of the ink are neglected.