印刷厂在印刷过程中会遇到的一个问题就是实地印刷墨色不匀，这个是常见的一个问题，那么怎么避免和呢？我们要知道一般印品墨色不匀表现为水纹状不匀和橘皮状不匀两种。
One of the problems that printers will encounter in the process of printing is the uneven ink color in the field printing. This is a common problem, so how to avoid and solve it? First of all, we need to know that the ink color unevenness of general printing products is manifested by two kinds of unevenness, i.e. water pattern unevenness and orange peel unevenness.
造成这两种现象的原因：1.水纹状色不匀主要是由于凹版雕得太深，而油墨的黏度偏低所造成的。2.橘皮状墨色不匀产生的主要原因一是油墨中加入了过量的极性溶剂如丁酮等；二是油墨的黏度过高导致流平性不好；三是压印胶辊质量，导致印刷时压印胶辊对印版滚筒的不同部位压力不均匀。
The reasons for these two phenomena are as follows: 1. The uneven color of the water pattern is mainly caused by the deep gravure carving and the low viscosity of the ink. 2. The main reasons for the unevenness of orange peel ink are the addition of excessive polar solvents such as butanone in the ink; the high viscosity of the ink leads to poor leveling; and the quality of the embossing cots, which results in uneven pressure on different parts of the printing cylinder.
原因找到了，那么的办法有哪些呢？
The reason has been found, so what are the solutions?
（1）与制版企业联系，通过测试找出印版滚筒、油墨、印刷条件的匹配结果。制版企业以此为基础确定适宜的雕版工艺参数。经过此过程制程的凹版在实地专色版印刷不匀上具有较强的适应性。
(1) Contact with plate-making enterprises and find out the matching results of plate drum, ink and printing conditions by testing. On this basis, plate-making enterprises determine appropriate engraving process parameters. Gravure plate produced by this process has strong adaptability in solving uneven spot printing.
（2）在接到新活件时，及时和客户沟通，尽量避免将专色版雕得太深。如果凹版雕得较深时，可在保证油墨流平性的基础上适当提高油墨的工作黏度。
(2) When receiving new live parts, communicate with customers in time and try to avoid engraving the spot-color plate too deeply. If the Gravure Engraving is deeper, the working viscosity of the ink can be improved properly on the basis of guaranteeing the leveling of the ink.
（3）对于专色橘皮不匀现象，一颗适当降低油墨黏度，第二课适当降低压印胶辊的压力，第三尽量提高印刷速度。
(3) For spot orange peel irregularity, the first one is to reduce the ink viscosity properly, the second one is to reduce the pressure of the embossing roller properly, and the third one is to increase the printing speed as far as possible.
（4）合理调配溶剂配比和油墨的工作黏度。在印刷速度超过100m/min,油墨的黏度一般控制在20~26s左右，在溶剂配比上可适当增加快干溶剂。
(4) Rational mixing of solvent and working viscosity of ink. When the printing speed is over 100 m/min, the ink viscosity is generally controlled at about 20-26 s, and the fast-drying solvent can be properly increased in the solvent ratio.
The above content is a small edition of Jinan Packaging and Printing. If you need more knowledge, please contact us in time or click on our official website for consultation: http://www.jindingyinshua.com/
