Compensation patterns for faulty printing nozzles

A technology for nozzles and faults, applied in the direction of printing, transfer materials, copying/marking methods, etc., capable of solving problems such as insufficient compensation

Active Publication Date: 2021-09-07
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it is clear in practice that this scheme is often not good enough to compensate for the occurrence of "white lines"

Method used

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  • Compensation patterns for faulty printing nozzles
  • Compensation patterns for faulty printing nozzles
  • Compensation patterns for faulty printing nozzles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] A preferred field of application for implementing the variant is an inkjet printer 7 . exist figure 1 An example of the basic structure for such a machine 7 is shown in , which comprises a feeder 1 up to a receiver 3 for transporting a printing substrate 2 into a printing unit 4 in which a print head 5 pairs Substrate 2 is printed. This is a sheet inkjet printing press 7 , which is controlled by a control computer 6 . However, the method according to the invention can also be used for other types of digital printing machines 7 . During the operation of these printing presses 7 , failures of individual printing nozzles in the printing heads 5 of the printing units 4 can occur (as described above). The result is then "white lines" 9, or distorted color values ​​in the case of multicolor printing. figure 2 An example of such a "white line" 9 in a printed image 8 is shown in .

[0031] exist Image 6 A preferred implementation variant of the method according to the i...

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PUM

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Abstract

The invention relates to a method for correcting, by means of a computer (6), faulty printing nozzles in an inkjet printing machine (7), which after a rasterization process is compensated by increased ink application of adjacent printing nozzles, comprising Steps: the computer (6) pre-calculates different compensation grids (10) for different surface coverage; printing the compensation grid (10) embedded in the surface coverage grid surface (11); analyzing and processing the printing by the computer (6) The compensation grid (10); computer (6) selects and saves for each area coverage level the following compensation grid (15), which is closest to the original grid in the corresponding area coverage grid plane (11) The color of the grid; the computer (6) detects the faulty printing nozzle in the official printing; the computer (6) obtains the partial surface coverage along the detected faulty printing nozzle; the computer (6) uses the saved partial surface coverage for the obtained Compensation grid (15) is used to compensate faulty printing nozzles.

Description

technical field [0001] The invention relates to a method for correcting faulty printing nozzles in an inkjet printing press by means of a compensation grid. Background technique [0002] The present invention is in the technical field of digital printing. [0003] In digital printing, more precisely in inkjet printing, the problem of printing nozzles that do not function properly enough or fail completely, especially in industrial large-format printing, is of major importance for the print quality to be achieved. question. Here, these faulty printing nozzles (also referred to as "missing nozzles") have various causes and manifestations. Most of these malfunctioning print nozzles are caused by the dry ink left over from previous print jobs clogging these print nozzles. Further technical reasons may lie in problems with the ink supply to the individual nozzles or with the electrical control of the individual nozzles. [0004] The influence of such "missing nozzles" on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41M5/00
CPCB41M5/00B41J2/04593B41J2/2139B41J2/2146B41J2025/008B41J2/0451B41J2/04586
Inventor I·特拉莎娜斯M·迈尔P·哈赫曼
Owner HEIDELBERGER DRUCKMASCHINEN AG
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