Overlapping Colors in Flexo Printing (4)

The result of the adjacent color substitution IT 8.7/3 color gamut is not as large as the gamut space of the complementary color substitute ink, but the adjacent color replacement ink system can achieve the neutral ash balance. Figure 14-19 shows the L*a*b* data obtained by printing the adjacent color of the IT8.7/3 color index instead of the ink system. The profiles created by these patches are also used in the printing of 5G and 2.5YR, that is, 5G and 2.5YR are printed by their respective adjacent color substitute ink systems. The adjacent color substitute ink system cooperates with the adjacent color characteristic description file, and can achieve a neutral gray balance within a certain range, but it cannot obtain a high saturation color. This is because the purple (V), orange (O), or green (G) ink is used here only to expand the color reproduction range of the conventional CMYK ink system because they replace a corresponding adjacent color in the CMYK ink. Instead of using with CMYK inks. However, they can achieve neutral gray balance. Due to the limitations of the process itself, the printing reproduction of high-light areas is also a problem. In flexo printing, dot gains are large, especially in high gloss areas, which has become a problem that is increasingly causing headaches for printers. The high light color blocks in the Munsell Color Atlas include 2% small dots, and the minimum dot value that the plate can reach is 2%, but after printing it will expand to 5% dot. Under the printing conditions listed in Table 2, if the color management system is not used for control, the dot enlargement rate of the highlight region will be very large, and 2% of the dots will be about 12% of dots after printing. The color management system takes into account the problem of dot enlargement during the printing process and can effectively control this. Conclusion In our printing industry, the Munsell Color Atlas is a very accurate color classification and calibration system. In the course of the research, we found that the Munsell color system is a reasonable and perfect method for implementing color reproduction in the hyperchromic domain of flexo printing in this project, and it also performs specified parameters in the input and output devices. The best conversion, test the feasibility of a variety of color management systems. Based on the results of the research and testing, a compromise solution was adopted on the basis of the four-channel ink system. With the established alternative ink system (comprising complementary color substitution and adjacent color substitution ink system), the high saturation color and neutral gray color cannot be accurately realized due to limitations of the four-channel ink printing and color management system. . For the existing color management systems and feature description software, corresponding solutions have been formulated (see below). According to the requirements of color reproduction, the page of the image is divided into several parts. For each of the different areas of the image, the complementary color is used instead of the adjacent color to replace the ink system. In other words, two different characteristic descriptions may be embedded in the same image at the same time. file. For example, the scanned 2.5YR will contain an OMYK profile in the color area and a neutral gray balance through a COYK profile. By improving the flexographic printing process technology, the range of colors that it can reproduce is likely to be further expanded. If you want to do some in-depth research on this, I hope the following suggestions will help you, because the purpose of these suggestions is to improve the level of technology, and provide corresponding solutions to the limitations discussed above. First, the higher the number of screen lines of the anilox roller, the lower the amount of ink transferred by the anilox roller and the range of allowable printing conditions. In this study, a 2.0 BCM anilox roll was used, and the solid ink density (SID) after printing was higher than the SID value recommended for other printing processes. Reducing the amount of ink transferred and increasing the number of screen lines of the anilox roller can effectively control the expansion of the dot network and the growth of the tone, and achieve a higher SID value and a better printing contrast. In this way, deviations in tone due to different operators can be reduced. Second, the hybrid screening method can effectively control the enlargement of network points and tone growth in high-light areas. The results of the study show that the use of frequency modulation screening (FM) in high-light areas can ensure that the tonal range after printing is relatively complete and the loss is small. Third, try to use a low density ink to achieve a better highlight effect. Since inks have relatively few pigments, it is very likely that the optical density of the ink will be reduced. The fourth and final point is to study the transition from the RGB color space to the four-channel ink system. This transformation will introduce a new ink into the color separation system through spectral data. Testing and evaluation of color lookup tables and conversion algorithms, as well as testing of different settings for GCR and UCR are also necessary. In the past decade, the flexographic printing industry has undergone many reforms, mainly the continuous improvement of the level of process technology. The study, with the help of the Munsell Color Atlas, studied the range of color gamut of the ink replacement system (comprising complementary colors and adjacent color ink replacement systems). The results of the research show that: in the process of color conversion, the control through the color management system is an effective method. Due to the bright and vivid colors and the consistency of the flexographic prints, the flexographic printing process has been favored by many customers. Moreover, it will continue to maintain a strong competitive strength in the future and be able to take the lead.