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Method for Compensating Faulty Printing Nozzles in Inkjet Printing Machines by Computer

A technology of inkjet printing machine and computer, which is applied in printing, image communication, transfer printing materials, etc.

Active Publication Date: 2021-06-22
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This choice of a neutral color correction color for gray is a compromise, since the color value of this correction color lies between the color values ​​of the process color used, but it is impossible to exactly match this color value

Method used

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  • Method for Compensating Faulty Printing Nozzles in Inkjet Printing Machines by Computer
  • Method for Compensating Faulty Printing Nozzles in Inkjet Printing Machines by Computer
  • Method for Compensating Faulty Printing Nozzles in Inkjet Printing Machines by Computer

Examples

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Embodiment Construction

[0024] A preferred field of application for implementing the variant is the inkjet printer 7 . figure 1 An example of the basic structure of a machine 7 of this type 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 is shown in Receiver 3. Here, this is a sheet inkjet printing press 7 controlled by a control computer 6 . As already described, 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 consequence is white lines 9 or, in the case of multicolor printing, distorted color values. figure 2 An example of such a white line 9 is shown with a printed image 8 .

[0025] In its preferred embodiment, the invention describes a method for compensating white lines 9 which can also be used in addition to other methods. The important difference is that the resulting white line 9 is compensated ...

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Abstract

The invention relates to a method for compensating faulty printing nozzles in an inkjet printer (7) by means of a computer (6), wherein an additional printing head (5a) is present for compensation, said additional printing head (5a) Supported behind the print head (5) for conventional printing and equalizing the faulty locations of faulty printing nozzles in such a way that the additional printhead (5a) prints the faulty locations in a correction color (12) exhibiting a gray tone, the The method is characterized in that the color values ​​of the correction color (12) in the CIE-Lab color space are optimized in such a way that the correction color (12) is separated from the color values ​​of all used process colors (14, 15, 16). Spacing (11) is as minimal as possible, except for yellow (13).

Description

technical field [0001] The invention relates to a method for compensating faulty printing nozzles in an inkjet printing machine by means of additional correction colors. [0002] The technical field to which the present invention pertains is digital printing. Background technique [0003] In general, in digital (or inkjet) printing, the color to be printed is usually not one of the process colors CMYK in four-color printing, or an additional color or spot color OVG or other possible additional colors in multi-color printing Instead, it appears as a mixture of multiples of these base colors. Like the primary / process / process color, this mixed color is characterized by a fixed local position in the CIE-Lab color space. The microscopic arrangement of the color dots of the primary colors also requires a suitable rasterization of the printing material (Sujet), in order to achieve the impression of mixed colors macroscopically. [0004] In inkjet printers, printing nozzles can m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/21
CPCB41J2/2139B41J2/2146B41J2025/008H04N1/4015H04N1/6008
Inventor S·内布N·R·诺瑞克A·亨J·福歇M·迈尔
Owner HEIDELBERGER DRUCKMASCHINEN AG
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