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如何控制专色油墨印刷有色差的问题!
作者:admin 来源:http://www.sdhzyw.com 发布时间:2019-5-16 15:36:25 浏览次数:66
为了提高印刷品的设计及质量水平,印刷厂在印刷商标、包装、宣传品时,经常要使用专色油墨,以保证印品的色彩一致性,满足客户的要求,接下来济南精装书制作就跟大家一起探讨如何在印刷的过程中控制专色油墨的印刷色差,希望对大家有所帮助!
In order to improve the design and quality of printing products, printing factories often use spot-color ink when printing trademarks, packaging and publicity materials to ensure the color consistency of printing products and meet customer requirements. Next, Jinan hardcover book production will discuss with you how to control the printing color difference of spot-color ink in the process of printing, hoping to help you all!
1. 印刷压力
1. Printing Pressure
印刷压力的大小对于油墨从印版上转移到纸张上的程度有很大的影响,当印刷压力不足时,油墨的转移不充分,不适宜印刷;当印刷压力过大时,由于印版上的油墨向图文以外的空白部分铺展,油墨转移率非但得不到提高,而且还带来其它弊病,同样不适宜印刷。只有在适当的印刷压力范围内,才能印出墨层厚实、图像清晰、阶调丰富和色彩再现性良好的印刷品。
The size of printing pressure has a great influence on the degree of ink transfer from plate to paper. When printing pressure is insufficient, the transfer of ink is insufficient and unsuitable for printing. When printing pressure is too high, the transfer rate of ink is not only not improved, but also brings other disadvantages, which is not suitable for printing. Only in the proper range of printing pressure can the printed matter with thick ink layer, clear image, rich tone and good color reproduction be printed.
2. 印刷速度
2. Printing speed
印刷速度的增加,会使印刷面间的接触时间变短,网点发虚,油墨转移率降低,印刷质量下降。为了保证印刷面的充分接触,提高印刷质量,这就要求在一定印刷压力下,控制好印刷速度,以获得稳定的墨层厚度。
The increase of printing speed will shorten the contact time between printing surfaces, weaken the dots, reduce the ink transfer rate and reduce the printing quality. In order to ensure the full contact of the printing surface and improve the printing quality, it is necessary to control the printing speed under a certain printing pressure in order to obtain a stable ink thickness.
3. 墨层厚度及水墨平衡
3. Ink Layer Thickness and Ink Balance

印刷过程中对油墨色相的控制主要是通过控制墨层的厚度来实现。在墨层厚度变化0.1μm左右时就会引起△E=1.5~4.5NBS的色差,显然这一影响是很大的。胶印的墨色再现和水墨平衡密切相关,在同样的墨量情况下,水大水小会影响颜色的深浅。正确掌握水墨平衡,特别注意润湿液的PH值至关重要。用水量大小的原则为不上脏的情况下,采用尽可能小的供水量。

济南精装书制作

The control of ink color in printing process is mainly realized by controlling the thickness of ink layer. When the thickness of the ink layer varies about 0.1 um, it will cause E=1.5-4.5 NBS color difference. Obviously, this effect is very great. Ink reproduction in offset printing is closely related to ink balance. Under the same amount of ink, large amount of water and small amount of water will affect the depth of color. It is very important to know the ink-water balance correctly and pay special attention to the PH value of the wetting liquid. The principle of water consumption is to use the smallest possible amount of water supply when the water is not dirty.
4. 干湿密度差
4. Dry-wet density difference
同一纸张,刚印刷出来的样张密度较高,而经过一段时间后的样张,随着油墨的干燥平滑度降低,密度值就会下降。由于墨层干燥前后密度值不同,印刷图像呈现的色调也不同。
For the same paper, the density of the newly printed sample sheet is higher, but after a period of time, the density value will decrease as the smoothness of the ink decreases. Because the density value of ink layer before and after drying is different, the color of printing image is different.
刚印出的印品,油墨尚处于湿态,与干态时有一个差值。这是因为刚印出的墨层有一定的流平性,所以表面反射以镜面反射为主,看上去色彩鲜艳,光泽好。当墨层处于干燥状态时,表面反射以漫反射为主,色泽自然比刚印刷出来时显得要暗淡无光。故一般印刷样张的墨色稍比标准样张深,但究竟深多少要采用数据化控制,在打样时,测定刚印下来的各色密度值,在印刷时,参照这些密度值来印刷,就能使两者的墨色接近一致。带有偏振滤色片的密度计能够消除墨层表面因镜面反射而产生的光,所测得的湿色密度与干色密度非常接近,测得的密度值受墨层干湿影响很小。
The ink of the newly printed product is still in the wet state and there is a difference between the wet state and the dry state. This is because the newly printed ink layer has a certain level, so the surface reflection is mainly mirror reflection, looks bright and shiny. When the ink layer is in a dry state, the surface reflection is mainly diffuse reflection, and the color is naturally darker than when it is just printed out. Therefore, the ink color of printed sample sheet is slightly deeper than that of standard sample sheet, but how much darkness should be controlled by data. When proofing, the density values of the newly printed colors should be determined. When printing, the ink color of the two samples can be nearly identical by referring to these density values. Densitometer with polarization filter can eliminate the light produced by mirror reflection on the surface of ink layer. The measured wet color density is very close to the dry color density, and the measured density value is little affected by the wet and dry ink layer.
这就是今天给大家介绍的纯干货的内容了,相信今天的内容能给打击带来一定的帮助,如果您对文章的内容还有不明白的地方,欢迎大家点击我们的官方网站留言讨论:济南精装书制作 http://www.sdhzyw.com
This is the content of the pure dry goods introduced to you today. I believe that today's content can bring some help to the crackdown. If you still don't understand the content of this article, please click on our official website to discuss: Jinan hardcover book production http://www.sdhzyw.com.