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. Printing color difference source is mainly caused by improper human operation, so the master should have a thorough understanding of the formation of color.

那么在印刷過程中出現(xiàn)顏色差別該如何處理呢？我們要注意三個要求：

So how to deal with the color difference in the printing process? We should pay attention to three requirements:

1、 對原紙的要求：對每批原紙進行嚴格的檢驗，檢驗指標包括厚度、挺度、定量、水分、顏色、表面張力、轉移膜粘接牢度、鐳射圖案等，逐一與技術標準的一概不用，這樣就避免了因原紙有色差等問題。

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、 對油墨的要求：要求油墨供應商對標樣印刷所用油墨進行定量分析，主要包括油墨的強度、灰度、色相誤差、著色力、透明度、粘度、細度、顏色穩(wěn)定性等指標，以此作為油墨的技術標準。油墨供應商所供每批油墨需提供詳細、真實的指標檢測數(shù)據(jù)，并與標準油墨指標比對，符合各項內控指標時才能投入使用，這樣就能有效避免以往憑主觀判定油墨適用性，沒有對油墨進行定量分析而造成的印刷色差。

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、 注重對印刷設備的檢修調整：定期對墨槽進行徹底清洗，確保墨匙動作靈活到位。查看水輥、墨輥、擺駕有無磨損現(xiàn)象。用塞規(guī)、印制墨杠等方法檢驗印刷壓力，使之與預設值保持一致。測量橡皮布及印版厚度，使之與標準數(shù)據(jù)相符。及時更換達到使用壽命的UV燈，避免因UV燈功率衰減而影響油墨固化速度，而影響印刷質量。及時更換達到規(guī)定印數(shù)的印版，避免因圖案的細微磨損而影響印刷顏色效果等。

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.

要想處理好顏色差別，就要做好以上三點，正確認識產生印刷色差的若干因素所在，通過把好印刷工藝和操作技術關，不但可以有效地避免這樣和那樣的印刷弊病產生，而且可以較好地保證彩色印刷品的墨色質量，印刷出好的產品，贏得客戶的信任。

In order to deal with the color difference, it is necessary to 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 good products and win the trust of customers.