Printing nozzle compensation method considering adjacent surface coverage

A technology of nozzles and inkjet printing machines, which is applied in printing, transfer materials, power transmission devices, etc., and can solve problems such as density of adjacent areas of printed images that are not mentioned

Active Publication Date: 2020-03-10
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of adjacent area density in a given printed image is also not mentioned here.

Method used

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  • Printing nozzle compensation method considering adjacent surface coverage
  • Printing nozzle compensation method considering adjacent surface coverage
  • Printing nozzle compensation method considering adjacent surface coverage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] A preferred field of application for implementing the variant is the inkjet printer 7 . figure 1 The basic structure of a machine 7 of this type is shown in , which comprises a feeder 1 up to a receiver 3 for feeding a printing substrate 2 into a printing mechanism 4 where the printing substrate 2 is fed by a printing head 5 print. This is a sheet inkjet printing press 7 controlled by a control computer 6 . As already mentioned above, during operation of the printing press 7 , it may occur that individual printing nozzles in the printing head 5 of the printing unit 4 fail. The result is then "white lines" or, in the case of multicolor printing, distorted color values. figure 2 An example of such "white lines" in a printed image is shown in .

[0028] here, image 3 The compensation 10 known from the prior art by adjacent printing nozzles is shown again. It can be well seen how the "white lines" 9 are compensated by compensation 10 (i.e. increasing ink volume) of t...

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PUM

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Abstract

The invention relates to a method for compensating defective printing nozzles in an inkjet printer (7) by means of a computer (6), wherein, in order to compensate for defective printing nozzles, the computer (6) calculates an increased ink droplet volume (10) of the directly adjacent printing nozzles and additionally calculates a reduced ink droplet volume (11) of the respective next adjacent printing nozzle and then controls the printing nozzles accordingly. The method is characterized in that the computer (6) calculates the increased and reduced ink droplet volume (10, 11) on the basis of image content with respect to the areal density in the adjacent printing nozzle regions.

Description

technical field [0001] The invention relates to a method for compensating for defective printing nozzles in an inkjet printing machine, taking into account a given areal density in the area of ​​adjacent printing nozzles. [0002] The technical field to which the present invention pertains is inkjet printing. Background technique [0003] In inkjet printing, the resulting printing results depend to a large extent on the status and performance of the respectively participating inkjet print heads (or the printing nozzles of the inkjet print heads involved) in the individual printing units. Quite often here it is the case that the individual printing nozzles either deviate from their predetermined printing dot positions and / or do not print with the originally intended ink volume. In extreme cases, this can lead to complete failure of individual printing nozzles. Such errors in the representation of the individual printing nozzles lead to corresponding disturbances in the prin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/165
CPCB41J2/165B41J2/16579B41J2/2146B41J2/2139B41J2025/008
Inventor A·豪克
Owner HEIDELBERGER DRUCKMASCHINEN AG
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