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1. (WO2015117925) INK JET PRINTING METHOD AND PRINTER

Pub. No.:    WO/2015/117925    International Application No.:    PCT/EP2015/052095
Publication Date: Fri Aug 14 01:59:59 CEST 2015 International Filing Date: Tue Feb 03 00:59:59 CET 2015
IPC: B41J 2/21
Applicants: OCE-TECHNOLOGIES B.V.
Inventors: DE GRIJS, Eduard T.H.
Title: INK JET PRINTING METHOD AND PRINTER
Abstract:
The invention comprises a method of compensating a failing nozzle of a print head of an inkjet printer, the inkjet printer comprising at least one print head, the at least one print head comprising a plurality of nozzles, wherein a receiving material is moved relatively to the at least one print head, wherein the method comprises the steps of ejecting droplets of marking material from the plurality of nozzles onto the receiving material forming dots of an image, scanning the printed dots, analyzing the scanned dots for detecting whether a nozzle is failing, determining a group of nozzles which group most likely contains the nozzle that is failing, selecting one nozzle of the group of nozzles, in an image part ejecting compensating droplets of marking material in accordance with a compensation scheme selected as if said one nozzle is failing, scanning the image part, repeating the previous two steps for each other nozzle in the group of nozzles, analyzing each image part, selecting from the image parts a deviating image part, the deviating part having a highest or lowest print quality of all image parts,selecting a compensation scheme based on the deviating image part, and proceeding with printing, including ejecting compensating droplets in accordance with the selected compensation scheme. The invention also comprises an inkjet printer configured to execute the method.