In printing, color difference can not be prevented. As long as the color deviation is not severe, it can be understood as a normal scale. However, the printing color difference will still affect the quality of printing. Let's talk about how to reduce the printing color difference. First of all, the requirements of base paper, paper thickness, stiffness, moisture, color, surface tension need to be tested.
If the paper is not qualified in the process of technical specification comparison, it can not be used, otherwise it will affect the printing quality and prevent the formation of printing color difference due to the color difference of base paper. Secondly, the requirement of ink mainly depends on the gray scale, hue error, coloring power, transparency and so on, which is the technical specification of ink.
And compared with the standard ink target, the non-standard ink is not used to prevent the influence of ink formation, which also improves the production power. Thirdly, the printing equipment should be adjusted in time, and the ink tank should be cleaned regularly to check whether the water roller ink roller has wear marks. Even if the printing plate reaches the regular printing number, the printing color effect will be prevented due to the fine wear of the picture.
Finally, perform the correct operation process. Before starting the machine, it is necessary to acknowledge whether the raw and auxiliary materials are qualified, whether the paper feeding table, paper teeth row and photoelectric detection are in normal condition, and whether there is no empty sheet or double sheet phenomenon; Recognize whether the temperature and water level of fountain solution meet the requirements, and whether the pressure of water roller, ink roller and printing plate is normal, so as to prevent ink emulsification and adhere to the balance of water and ink. In normal production, we should adhere to a stable printing speed, not high and low, to prevent printing color difference due to inconsistent printing speed.
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