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Method for controlling quality of intaglio printing special color and halftone images

A technology of gravure printing and image quality, applied in printing, color/spectral property measurement, printing plate preparation, etc., it can solve the problem of insufficient accuracy, difficulty in judging plate-making dots, color matching, or printing, and inability to unify standards, etc. problems, to avoid the long training cycle, simple judgment, and easy operation.

Inactive Publication Date: 2018-03-13
上海紫江彩印包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To sum up, the existing spot color halftone image control methods only control the color of the solid part, not the color of the midtone; when the dark tone is inconsistent with the light net and midtone, it is difficult to judge whether it is a plate-making dot, color matching, or The problem of printing needs to be judged by experience, which is highly subjective, unable to unify the standard, and the accuracy of the method is not enough

Method used

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  • Method for controlling quality of intaglio printing special color and halftone images
  • Method for controlling quality of intaglio printing special color and halftone images
  • Method for controlling quality of intaglio printing special color and halftone images

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A kind of gravure printing image quality control method, comprises the steps:

[0039] Step 1: Make a monochrome color card within the range of K standard dot gain, such as figure 2 As shown, the presentation of different colors produced by meshing from 0 to 100%. As shown in Table 1, set the standard dot gain minimum Min DG and dot gain Max DG for typical dots, Tatget Dot Gain is the standard dot gain, Tolerance: + / - is the dot spread tolerance.

[0040] Table 1

[0041]

[0042]

[0043] Step 2: K color card dot expansion printing test:

[0044] Print the monochrome color card on the printing machine with black ink. At this time, it is necessary to determine the manufacturer of the ink and determine the printing process parameters. After several experiments on the machine, the dot gain is between the two lines of Min DG and Max DG. At the same time Measured 0-100% network layer density value, that is, the color density restoration curve, such as figure 1 sh...

Embodiment 2

[0053] The steps are the same as in Embodiment 1, the difference is that the outlets in step 3 are selected from 100%, 60%, 20%, and 3% outlets.

Embodiment 3

[0055] The steps are the same as in Embodiment 1, the difference is that the outlets in step 3 are selected from 100%, 85%, 55%, and 10% outlets.

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Abstract

The invention relates to a method for controlling the quality of intaglio printing special color and halftone images. The method comprises the following steps: (1) making a single-color-gradation color-modulating card and setting standard Min DG and Max DG for a typical website; (2) performing printing test on the single-color-gradation color-modulating card on a printing machine; (3) calculatingthe expanding value of the corresponding website by a Murray-Davis formula, guaranteeing that the the expanding value is between the Min DG and the Max DG to obtain a TVI curve and a color reduction curve and making a standard sample of a monochromatic pattern to enable the website expanding value of the typical website to be between Min DG and Max DG; and (4) obtaining an international color consortium (ICC) color characteristic file and a standard reduction curve according to the standard sample, performing plate making and making a draft. By the method, the image can be directly engraved onthe printing plate during engraving, other cost is not needed, the judgment is simple, and the accuracy and the standard of quality control of the intaglio printing special color and halftone image are improved.

Description

technical field [0001] The invention relates to the technical field of gravure printing, in particular to a method for controlling the quality of halftone images of spot colors in gravure printing. Background technique [0002] Halftone usually refers to the change from light to dark and from light to thick on the printed matter after special processing, which is expressed by the size of the dot area. On the printed matter screen, color and shade are represented by the size of dots. When observing the printing screen, if the dot area is large, the color will be dark; if the dot area is small, the color will be light. At present, for halftone patterns or spot color hanging net patterns, usually only the solid color is controlled, and the rest of the light nets are not controlled when the spot is accurate. Due to the influence of the printing process, the dot expansion is unavoidable, and the reasonable dot increase It helps to achieve stable printing quality, so it is neces...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/93G01N21/956B41C1/00
CPCB41C1/00G01N21/31G01N21/93G01N21/956
Inventor 王亮何杰郭强
Owner 上海紫江彩印包装有限公司
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