First of all, color is the product of the visual system after receiving light stimulation, and it is the subjective image of the individual to the light stimulation of different wavelengths in the visible spectrum. As like as two peas, the color deviation is not the same as in the printing process. The deviation is due to the deep knowledge of the Shifu. The source of printing color difference is mainly caused by improper human operation, so the master should have a thorough understanding of the formation of color.
So how to deal with the color difference in the printing process? We should pay attention to three requirements:
1. Requirements for base paper: each batch of base paper shall be strictly inspected, and the inspection indexes include thickness, stiffness, ration, moisture, color, surface tension, transfer film bonding fastness, laser pattern, etc., which are not used in accordance with the technical standards one by one, so as to avoid problems such as color difference of base paper.
2. Requirements for ink: the ink supplier is required to conduct quantitative analysis on the ink used in standard sample printing, mainly including the ink strength, gray scale, hue error, coloring power, transparency, viscosity, fineness, color stability and other indicators, which are used as the technical standard of ink. Each batch of ink supplied by the ink supplier needs to provide detailed and real index test data, and compare with the standard ink index. Only when it meets the internal control index can it be put into use. In this way, it can effectively avoid the printing color difference caused by subjective judgment of ink applicability and no quantitative analysis of ink.
3. Pay attention to the maintenance and adjustment of printing equipment: clean the ink tank thoroughly on a regular basis to ensure that the ink key moves flexibly and in place. Check whether the water roller, ink roller and swing drive are worn. Check the printing pressure with plug gauge and printing ink bar to make it consistent with the preset value. Measure the thickness of blanket and plate to make it consistent with the standard data. Timely replacement of UV lamp to achieve service life, avoid UV lamp power attenuation and affect the ink curing speed, and affect the printing quality. Timely replacement of the plate to achieve the required number of prints, to avoid the impact of the printing color effect due to the slight wear of the pattern.
In order to deal with the color difference, we must do the above three points well, correctly understand the factors that cause the printing color difference. By controlling the printing process and operation technology, we can not only effectively avoid this and that kind of printing defects, but also better ensure the ink quality of color printing products, print perfect products, and win the trust of customers.济南印刷厂讲解的内容 更多的内容 请咨询公司官网http://www.xinfengyinshua.cn/