Analysis of the most popular color screen printing

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Analysis of color silk printing technology

silk printing claims that everything except air and water can be printed. It has the characteristics of wide printing adaptability, thick printing ink layer, soft layout, and is not limited by the positive friction of the driven needle steel factory on the device due to the different size, shape and material of the printed object, which can not be replaced by other printing methods at present. It is also for these reasons that there are a wide variety of products printed from silk, from smooth surface to rough surface, from paper and fabric to iron sheet and glass. With the emergence of high-quality photosensitive adhesives and inks, people all hope that silk printing can print things that previously could only be offset printed. Therefore, many people directly take offset color separations to print, but the printing results are always unsatisfactory, either serious tone loss, serious color deviation, or ugly moire. The reason for this phenomenon is that they are not very clear about the factors that affect the change of silk printing point, so they cannot carry out quantitative control. Therefore, this paper makes a simple analysis of the factors that affect the change of silk printing dot, such as dot shape, number of lines, printing material, ink, exposure time, and so on, so as to provide a certain reference for the reproduction of color silk printing tone

1 effect of point shape on point change

first, use coreldraw8 as the testing tool of gradient test, gray scale, whose gradient range is 5% 100%. 40lpi, 60lpi, 80lpi and 100lpi are used for the hair arrangement, and the angle is 45 degrees. The points are circular points and square points. The experimental materials are coated paper, offset paper, 300 mesh silk, silk screen printing ink (Fluorescent Pink, fluorescent yellow, fluorescent blue), offset printing ink (bright red, sky blue, medium yellow, magenta). The technology of X-Rite Jinan new era Gold Testing Instrument Co., Ltd. experimental machine in the country is the top 528 Ashley reflection densitometer and transmission densitometer measuring point percentage. Experiment with the above experimental materials and instruments to obtain the experimental data (as shown in the following tables). According to these data, draw the point change curve with the point percentage on the film (F0) as the horizontal axis, the point percentage on the print (f print) and the point percentage increment (△ F) as the vertical axis (the difference between the point percentage of the print and the point percentage of the film)

2 the effect of the number of lines on the point change

Experiment 2 uses different and the same number of lines The same exposure time, the same substrate, the same exposure time, the same substrate, the same ink type for printing (40lpi, 60lpi, 40s, square dot, coated paper, offset scarlet ink), the measured relevant data are shown in Table 2

from the data of Experiment 2 (Table 2) and the change curve of points learned at the press conference (Figure 2), it can be seen that the higher the number of lines added, the higher the point expansion value generated, and the larger the point expansion value generated, which shows that under the condition of ensuring the image reproduction clarity, the greater the difference between the number of color separation lines and the number of wire mesh, the more the image can maintain the finished tone; Moreover, the less likely the interference pattern is to reappear, because 300 mesh silk is used in this experiment. When 100lpi color chips are used, moire lines have appeared on the printing plate

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