For printing, it has improved a lot more than ten years ago. Heidelberg and Manroland are not only equipped with excellent equipment and high degree of automation, but also equipped with ink remote control system, which makes the color control of printed matter very convenient. Four color machine generally small printing enterprises have four to five such printing machines, but in reality, it is not only relying on machine automation to stabilize the color The operation process also needs to pay attention to several points.

，印刷品在上機(jī)前師傅也要根據(jù)打樣稿的顏色，稍微的調(diào)節(jié)各個墨斗的下墨量，配合印刷機(jī)器本身墨色遙控系統(tǒng)，這樣就可以輕松的完成，不能在印刷的時候不斷調(diào)整墨量，會導(dǎo)致顏色的上的色差。

First of all, before printing, the master should adjust the ink amount of each ink bucket slightly according to the color of the proofing draft, and cooperate with the ink color remote control system of the printing machine itself, so that it can be easily completed. If the ink amount cannot be adjusted continuously during printing, it will lead to the color difference on the color.

此外，還要針對該印刷品的用紙質(zhì)量好壞，圖文面積大小，先對油墨的黏度，流動性，干燥性等適當(dāng)調(diào)節(jié)，來提高其印刷適性，也要確保印刷正常進(jìn)行，不能因經(jīng)常停機(jī)清洗橡皮布和印版上的紙毛，墨皮而造成墨色深淺不一，如果到中期再加入黏劑，調(diào)墨油那么肯定是要有偏差的。

In addition, according to the quality of the paper and the size of the graphic area, the viscosity, fluidity and dryness of the ink should be properly adjusted to improve the printability, and the printing should be carried out normally. The ink color should not be different due to the frequent shutdown of the machine to clean the paper wool and ink on the blanket and plate. If the adhesive and ink mixing oil are added in the medium term, it would be better There must be deviations.

膠印是利用油水相斥的原理進(jìn)行印刷的，這個水指就是潤版液，它的大小直接回影響墨層顏色。水大墨層色談，水小墨層就會色深，水越大油墨的乳化越是嚴(yán)重。如何的油墨無光澤，色就談，乳化油墨的印品不僅色差嚴(yán)重，而且還會產(chǎn)生粘臟不干、印跡不牢等等質(zhì)量問題，所以在印刷操作中必須嚴(yán)格的控制印版版面的潤液大小，做好水墨平衡的工作，要求在不上臟的情況下，水越小越好。

Offset printing is the use of the principle of oil-water repellent printing, the water refers to the fountain solution, its size directly affects the ink layer color. Large ink layer color, small ink layer will be dark, the larger the water, the more serious the emulsification of ink. How to make the ink lusterless, color on talk, emulsion ink prints not only serious color difference, but also produce sticky dirty not dry, imprint not firm and other quality problems, so in the printing operation must strictly control the size of the printing plate, do a good job of ink balance, in the case of not dirty, the smaller the water, the better.

墨輥不良，印品能否獲得均勻的墨色，膠輥的質(zhì)量有很重要的作用，一般膠輥有傳墨輥，勻墨輥和著墨輥三種，它們對墨色濃淡有很大影響。墨輥的彈性，粘性，圓心度，硬度和表面光潔度如何，很大程度上決定了印刷品的墨色質(zhì)量，若出現(xiàn)著墨輥的彈性差，粘性不足，輥體偏心，膠體過硬及膠體老化等情況時，印刷過程中就容易造成著墨不均勻或不穩(wěn)定，所以印刷時要保證膠輥的質(zhì)量，才能確保每一個印刷周期涂布于印版上的油墨的均勻傳遞，同時也應(yīng)該調(diào)整好墨輥之間及墨輥和印版之間接觸壓力，否則也會造成傳墨不均勻，也會產(chǎn)生嚴(yán)重的色差。

The quality of COTS plays an important role in the poor quality of inks. Generally, cots have three types: transfer roller, uniform roller and inking roller. They have a great influence on the shade of inks. The elasticity, stickiness, centrality, hardness and surface finish of the ink roller largely determine the ink quality of the printed matter. In case of poor elasticity, insufficient stickiness, eccentric roller body, hard colloid and aging colloid of the ink roller, it is easy to cause uneven or unstable inking in the printing process. Therefore, it is necessary to ensure the quality of the rubber roller in order to ensure the quality of each ink roller In order to ensure the uniform transfer of the ink coated on the printing plate in a printing cycle, the contact pressure between the rollers and between the rollers and the printing plate should also be adjusted, otherwise the uneven ink transfer and serious color difference will also be caused.

生產(chǎn)中通常是油墨粘度來確定多色機(jī)的印刷色序，由于在多色印刷中，油墨是以濕壓濕的方式疊印，只有獲得更好的疊印率，才能印出墨色穩(wěn)定，相對穩(wěn)定的印刷品來。

In production, ink viscosity is usually used to determine the printing color sequence of multi-color machine. Because in multi-color printing, ink is overprinted in the way of wet pressing, only to obtain a better overprint rate can stable ink color and relatively stable print be produced.

在印刷上，影響色差的原因很多，控制方法也有很多，這要求我們在印刷的路上一直不停的探索，積累經(jīng)驗(yàn)，提高自己也能做出更好的成績來。

In printing, there are many reasons that affect the color difference, and there are many control methods, which requires us to constantly explore, accumulate experience, improve ourselves and make better achievements on the way of printing.