Method for controlling printing process during printing on paper web based on digital pre-press data of e.g. laser printing device, involves measuring printed result such that measured result is utilized to calibrate measuring units

摘要

The method involves performing a measurement of a printed result on a print material i.e. paper web (2), by a first set of measurement units (14, 16). The measured printed result is compared with a reference value in order to derive a correction value such that digital pre-press data or settings of a printing machine are corrected with the correction value. Another measurement of the printed result on the print material is performed by a second set of measurement units (18, 20) such that the latter measured printed result is utilized to calibrate the first set of measuring units. The measurement units are selected from a camera-based measurement unit, inline measurement units and a colorimeter or a spectrophotometer. An independent claim is also included for a plant for printing of a printing material based on a digital pre-press data or settings of a printing machine.