Patent ID: 6230622
Filing Date: 2001-05-15
Classification: B41F

Abstract:
A method of operating a printing machine having an expert system, comprising the steps of:(a) determining the effects of the interaction between operating parameters of the printing machine via at least one printing trial and during production, the different operating parameters comprising printing machine parameters, printing material parameters, printing plate parameters, printing ink parameters, damping solution parameters and printed product parameters; and(b) storing the effects of the interaction in the expert system for use with a printing operation;(c) performing first, second, and third quality loops, wherein the first quality loop comprises performing a basic calibration including determining the current operating parameters and determining a characteristic curve of control parameters to be used based on the current operating parameters, the second quality loop comprises printing an image and comparing a desired value and an actual value of the printed image, wherein the desired value is based on the characteristic curve in the expert system determined in the first quality loop, and compensating the characteristic curve based on a deviation of the actual value from the desired value, and the third quality loop comprises regulating a constancy of quality by regulating an ink density during print production.