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A Method for Determining the Optimum Solid Density of Printed Matters

A technology of solid density and determination method, applied in printing, printing devices, etc., can solve the problem of insufficient relative contrast, and achieve the effect of bright colors, fine layers, and suitable dot expansion.

Active Publication Date: 2019-11-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when determining the optimal solid density, it is not enough for us to only consider the relative contrast. In the actual production process, it is necessary to use the relative contrast to determine the solid density while ensuring that the dot expansion is within a certain range.

Method used

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  • A Method for Determining the Optimum Solid Density of Printed Matters
  • A Method for Determining the Optimum Solid Density of Printed Matters
  • A Method for Determining the Optimum Solid Density of Printed Matters

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Embodiment 1

[0050] Now take the determination of the best solid density of magenta M ink and cyan C ink as an example to specifically illustrate the method and operation process of the present invention.

[0051]Step 1: Make a 21-level sample of the magenta M and cyan C color blocks from 0% to 100% with an interval of 5%. Use a Heidelberg offset printing machine to print at a temperature of 20°C and a relative humidity of 38%. The printing color sequence is BK, C, M, Y; the screen line number is 175 lines / inch; the printing pressure is 13 silk; The printing speed is 6000 sheets / hour; the printing material is 157g / m 2 coated paper.

[0052] Step 2: During the whole process from the beginning of printing to the final ink-water balance, take a pass sample every 40 sheets, and take a total of 27 pass samples, and measure the solid density and 75% dots of each sample with a spectrophotometer The density at the area, the actual dot area at 50% of the dot area, and the relative contrast K and ...

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Abstract

The invention discloses a method for determining optimal solid density of a printed matter. The method comprises the steps that a four-color step wedge is designed, and transfer specimen pages are obtained; the solid density, the density at a 75% dot area, an actual dot area at 50% of each of the specimen pages are measured, relative contrast and dot gain are calculated; a mathematical model of arelationship between the relative contrast, the dot gain and the solid density is established; and then a functional relationship between the dot gain and the solid density is found when the relativecontrast is maximum; and the dot gain is in the range of 15%-20% of a national standard, and the solid density corresponding to the closest set of data of the function is taken as the optimal solid density. When determining the optimal solid density, the method can ensure that the relative contrast is good, the dot gain is suitable, and a printed matter layer is fine and the color is bright.

Description

technical field [0001] The invention belongs to the field of quality control of printed matter, and in particular relates to a method for determining the optimum solid density of printed matter. Background technique [0002] Solid density is an important quality control index in the printing process. Miscontrol of solid density will directly lead to abnormalities in other parameters and problems in printing quality. Therefore, determining the best solid density plays a vital role in the quality of printed matter. For a given combination of paper and ink, the most important issue is to determine the most reasonable amount of printing ink. The traditional method is to obtain printed sheets with different ink shades and detect different printed sheets by adjusting the amount of ink output during printing. The relative contrast on the surface, the density of the printed sheet with the largest relative contrast is the best solid density. However, when determining the optimal sol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41M1/14
CPCB41M1/14
Inventor 郭凌华王晶孙栗媛龙浩温蕾党玲玉刘明磊
Owner SHAANXI UNIV OF SCI & TECH
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