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.

假如紙張在技術規(guī)范比對過程中不合格，那么都不能用，否則會影響印刷質量，防止由于原紙有色差形成印刷色差。其次，油墨的要求主要看油墨的灰度、色相差錯、上色力、透明度等等目標，以此作為油墨的技術規(guī)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.

并與規(guī)范油墨目標比照，關于不符合規(guī)范的油墨不予以運用，防止由于油墨形成影響，一起也提高了出產功率。再次，及時對印刷設備進行調整定時對墨槽進行清洗，檢查水輥墨輥是否有磨損痕跡，即便替換到達規(guī)則印數(shù)的印版，防止因圖畫的纖細磨損而影響印刷色彩作用。

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.

終，履行正確的操作流程開機前要承認原輔料是否合格，輸紙臺、叼紙牙排、光電檢測等是否處于正常狀況，不呈現(xiàn)空張、雙張現(xiàn)象；承認潤版液的溫度、水位是否符合要求，水輥、墨輥與印版壓力是否正常，防止呈現(xiàn)油墨乳化，堅持水墨平衡。正常出產時堅持穩(wěn)定的印刷速度，不能忽高忽低，防止因印刷速度不一致而發(fā)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.