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Substrate-dependent compensation variation curve

A technology of changing curves and substrates, applied in the field of position-related density fluctuations, inkjet printing, can solve problems with errors, etc., and achieve the effect of reducing costs

Active Publication Date: 2021-08-13
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this also requires that the intermediate values ​​of these individual variation curves be equal, otherwise the conversion calculation by the scalar factor will be erroneous

Method used

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  • Substrate-dependent compensation variation curve
  • Substrate-dependent compensation variation curve
  • Substrate-dependent compensation variation curve

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Experimental program
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Embodiment Construction

[0023] A preferred field of application for implementing the variant is the inkjet printer 7 . figure 1 An example of the basic structure of such a machine 7 comprising a feeder 1 for feeding a printing substrate 2 into a printing mechanism 4 where the printing substrate 2 is printed by a printing head 5 up to Receiver 3. This is a sheet inkjet printing press 7 , which is monitored by a control computer 6 . During operation of the printing press 7 , as mentioned above, it may occur that the areal density achieved by the individual printing nozzles fluctuates. The local density fluctuations occurring in the inkjet printing machine 7 are compensated according to the invention by using compensation curves which vary the printing points to be applied to the printing material 2 (or printing substrate 2 ). Quantity and size equalize density fluctuations.

[0024] The factors influencing the density distribution achieved transversely to the printing direction in sheet inkjet print...

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PUM

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Abstract

The invention relates to a method for compensating position-dependent density fluctuations of printing nozzles in an inkjet printing machine (7) by means of a computer (6), wherein the computer (6) produces a reference for all printing substrates used Compensation curves (10, 11) for position-dependent density fluctuations of all print heads (5) of the inkjet printer (7) and applying the compensation curves (10, 11) to compensate the inkjet printing position-dependent density fluctuations in a machine (7), the method being characterized in that the computer (6) uses a generic generic reference printing substrate to determine printing machine or print head-specific influences and substrate-specific influencing factors, respectively, From the reference printing substrate, a reference compensation curve ( 11 ) is generated which is dependent on the area coverage and location and from which an overall compensation curve is generated which is used to compensate for position-dependent density fluctuations.

Description

technical field [0001] The invention relates to a method for compensating position-dependent density fluctuations of printing nozzles in inkjet printing machines by means of machine- and substrate-specific compensation. [0002] The technical field to which the present invention pertains is inkjet printing. Background technique [0003] The print heads used by inkjet printers have an array of printing nozzles arranged in various ways in the print head. The ink is ejected through the printing nozzles and thus produces the desired printed image. Due to production reasons, however, these printing nozzles have slight differences in the jetting behavior of the ink. This means that although the two printing nozzles are driven exactly the same and should therefore actually produce ink droplets of exactly the same size, there are slight differences between the two printing nozzles due to production-related differences. This results in small fluctuations in the achieved pixel size...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/175B41J29/38
CPCB41J2/175B41J29/38B41J2/2146B41J2025/008G06K15/027H04N1/6027H04N1/407H04N1/603B41J2/2054B41J2/2132B41J29/393B41J2029/3935H04N1/4078H04N1/6097
Inventor A·豪克
Owner HEIDELBERGER DRUCKMASCHINEN AG