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(3) different light sources, measured L, A, B values ​​are different, different standards derived E is also different, and now there are two international standards, one is the British standard, namely CMC, which requires all colors E the same; one for the Swiss standard, different colors E different.
(4) When comparing colors, color is best used in grey, white in white, and black in matte black.
6. When the adjusted ink is printed, the color is influenced by screen printing, scratching, and printing materials. Therefore, when printing proofing, the color proofing parameters should be the same as the customer's requirements for the screen parameters and substrates.
Fourth, screen printing ink color problems 1. The color card and the user to determine the color difference because the color card and color matching system is currently used by the offset printing system, so when the screen printing process changes in printing parameters will cause color Change, it is still necessary to fine-tune the treatment, the amount of ink on the ink affect the color of the ink. The ink ink is gradually increased in the order of plain printing, gravure printing, embossing, and silk screen printing, as shown in the following table. Therefore, the printing ink in the three-primary color screen printing is very difficult to print because each variable in the screen printing process affects the ink layer. Thickness, which affects the color of the print.
Several printing methods of ink thickness and transfer rate printing method Average ink layer thickness (U) Transfer rate (%)
Plain printing 0.7 to 1.4 30 to 50
Gravure 1.0 30～50
Embossing 8.0 50～60
Silkscreen 6.0 to 100 90 to 100
2. The appearance of the color appearance color is affected by the transmittance, reflectance, and foreign matter (ie, the two colors match well with the light source, but do not match under the other light source), the observation conditions, the illumination, and the ink layer. Thickness, ink opacity, overprint, substrate properties and other variables.
3. The substrate affects the surface finish, handling, ink absorption, and surface color of the substrate.
4. The thickness of the ink layer will cause the color change. Thickness of the ink is affected by the diameter of the screen mesh, stretching tension, type and thickness of the screen. In addition, the appearance and hardness of the squeegee, the pressure of the squeegee, the speed of the squeegee, the angle of the squeegee, the distance between the screens, and the thickness of the ink Different pressures, speeds, shapes, and types of presses have different ink thicknesses.
5. Changes in stencil tension and other factors cause hue changes. Standardization of light sources and observation conditions Observation rooms with dedicated light sources. With a spectrometer, it can be measured that each color has its own spectral curve.
7. Chromatic aberration: that is, different colors have different color differences, which can be measured by a spectrum detector. The color difference that can be distinguished by the human eye is 1 DE, the color difference of the sample output by the computer is 2 DE, the yellow color has 3 DE between it and the target color, and only 0.5 DE is acceptable between the gray and its target color.
8. When the ink containing 100% of color, the three primary colors have their own different meshes, and the specific parts of the highest color density of screen printing are: Yellow (Y) 200-240 mesh, Magenta (M) 200-240 mesh, Cyan (C) 180 ~ 200 mesh, because the three primary colors are not using the same mesh mesh, will make the color intensity loss, there are two ways to solve this:
(1) Mesh of the respective mesh;
(2) When using the same number of screens, care must be taken to increase or decrease the color ink so that the original color can be copied.
9. The number of spot color inks is accurate. If the ink is over-provisioned, the remaining ink will be wasted. If it is not enough, it will need to be deployed again. If complex colors are encountered, it is difficult to completely match the inks used for the second and first time. Impact, the general deployment should be slightly more than the actual amount, and the actual printing amount mainly from the printing area of ​​the figure, the number of printing the number of ink thickness and other aspects to consider.
From the above discussion, we can see that color matching is not simply a mixture of several colors, but a complex technical project. Only by mastering the screen printing process and color matching principles, can we match ink color and become a qualified transfer ink. Technical staff.
(2) Computer detection system: Because different colors have different wavelengths, the computer detects the color according to the perceived wavelength. The general computer film is the CIELAB system. As shown in the following figure, the colors can be determined based on the measured L, A, B, and calculated. ΔE, we can know the color difference between the color and the standard color. However, L, A, and B can only measure the color, cannot measure the color saturation, and have an error of 17% to 30% with the actual color. If coupled with L, C, H systems, first set the saturation, and then measure the L, A, B values ​​and L, C, H values, this time, the deviation from the actual color is only 7% to 17% of the error, and then When ΔE is measured, there is only an error of 0 to 3%. Therefore, only a complete inspection system can measure high-quality colors.