Method of preventing the formation of inkjet printing artefacts

An inkjet printer, printing direction technology, applied in printing and other directions, can solve the problems of reducing the total production volume, reducing the production volume, complicated reasons, etc., to achieve the effect of reducing implementation time, reducing costs, and overcoming image defects

Inactive Publication Date: 2012-04-25
XAAR TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The causes of this common problem are complex and from a hardware standpoint it is very difficult to overcome without reducing jetting frequency and additionally or consequently reducing throughput
For example, the time delay between depositing successive drops from a particular nozzle could be increased, allowing drops from adjacent nozzles a greater chance to coalesce, but on the other hand, this would significantly reduce throughput
Alternatively, the image can be printed in two passes and the droplets interleaved; this does prevent chain formation to some extent, but requires more than one pass over the substrate, reducing overall throughput
Furthermore, it has been found that even certain interleaving methods are prone to this artifact

Method used

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  • Method of preventing the formation of inkjet printing artefacts
  • Method of preventing the formation of inkjet printing artefacts
  • Method of preventing the formation of inkjet printing artefacts

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Embodiment Construction

[0038] The present invention solves the problem of chain formation by reducing the size of certain selected droplets within the printed pattern, thereby inhibiting coalescence on the substrate. Figure 5 shows a magnified image of a print made with UV-curable ink, where the artifacts in question are clearly visible. The printing direction P is from left to right; the chains formed in the image are evident at this magnification and will be perceptible at normal viewing distances. Figure 6 shows a similar printed image at higher magnification showing the horizontally extending chains in more detail. Figure 7 A print image showing the same print data as in FIG. 6, which is printed according to the present invention. The effect of using the present invention is clearly visible, the merging of droplets is now substantially isotropic, thus eliminating chain artifacts.

[0039] Figures 8 and 9 show, respectively, the theoretical droplet deposition for a single nozzle (N1) printing c...

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Abstract

A method for compensating for a tendency for droplets deposited by a plurality of nozzles of an ink jet printer to merge in the direction of printing on a substrate, comprising: identifying lines of pixels to be printed by each nozzle which have a grey level greater than a first threshold value; selecting certain of those pixels which are separated by a distance in the printing direction determined by a probability function and reducing the grey level of those certain pixels below a second threshold value so as to prevent merging of drops in the printing direction.

Description

technical field [0001] The present invention relates to droplet deposition methods, in particular inkjet printing. More specifically, the present invention aims at reducing the appearance of certain kinds of visible artefacts produced by inkjet printing. Background technique [0002] Inkjet printheads typically have one or more rows of nozzles for depositing ink onto a substrate. In a typical printing system, the printhead addresses the substrate by moving relative to the substrate in a printing direction that is generally perpendicular to the row direction. With controlled timing of ink ejection, the nozzles deposit ink droplets such that the droplets deposit generally onto a rectilinear grid on the substrate. Specific nozzles are responsible for depositing rows of droplets on the substrate that extend along the printing direction; the combination of rows of droplets deposited by adjacent nozzles produces the image. Thus, the grid spacing in the printing direction is con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/21
CPCB41J2/2132B41J2/2121
Inventor 朱利安·贝恩
Owner XAAR TECH LTD
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