Method for compensating for failed printing nozzles in inkjet printing systems
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United States of America Patent
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Jun 28, 2016
Grant Date -
May 19, 2016
app pub date -
Nov 13, 2015
filing date -
Nov 13, 2014
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for compensating failed printing nozzles in inkjet printing machines using a control computer, includes printing a test form for a material combination, evaluating the print and creating a look-up table having compensation probabilities for local surface density, detecting a failed nozzle, reading the size of the intended droplet to be compensated at the failed nozzle, calculating local surface density at the failed nozzle, reading a compensation probability from the table with the calculated local surface density, calculating a pseudo-random number for adjacent pixels right and left of the pixel to be compensated, increasing the droplet size for adjacent pixels if the pseudo-random number therefor is lower than the compensation probability from the table, calculating adjacent droplet sizes for all intended droplets at the failed nozzle and using the changed droplet sizes in printing data. The print job is carried out with changed printing data.
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