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.

假如纸张在技术规范比对过程中不合格，那么都不能用，否则会影响印刷质量，防止由于原纸有色差形成印刷色差。其次，油墨的要求主要看油墨的灰度、色相差错、上色力、透明度等等目标，以此作为油墨的技术规范。

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.

并与规范油墨目标比照，关于不符合规范的油墨不予以运用，防止由于油墨形成影响，一起也提高了出产功率。再次，及时对印刷设备进行调整定时对墨槽进行清洗，检查水辊墨辊是否有磨损痕迹，即便替换到达规则印数的印版，防止因图画的纤细磨损而影响印刷色彩作用。

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.

终，履行正确的操作流程开机前要承认原辅料是否合格，输纸台、叼纸牙排、光电检测等是否处于正常状况，不呈现空张、双张现象；承认润版液的温度、水位是否符合要求，水辊、墨辊与印版压力是否正常，防止呈现油墨乳化，坚持水墨平衡。正常出产时坚持稳定的印刷速度，不能忽高忽低，防止因印刷速度不一致而发生印刷色差。

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.