Modeling and analysis of rotogravure printing presses

Abstract

Print registration is the method of overlapping successive printed patterns to form a complex multicolor pattern. Registration error is the misalignment in the overlapped patterns. This paper deals with modeling machine direction registration error in a rotogravure printing press with multiple print units coupled by mechanical shafts. The model is developed by considering various dynamic elements in a print unit such as the print cylinder, doctor blade assembly, print unit compensator roller, cooling rollers, print unit motor, the effect of friction in various locations, etc. Experimental data from typical production runs on a print line is used to corroborate the model developed. Based on the developed model, mechanical design and control design recommendations to reduce registration error in print units are provided.