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到底是什么原因导致了印刷总出现油墨晶化?
作者:admin 来源:http://www.sdhzyw.com 发布时间:2019-6-29 16:03:19 浏览次数:58
包装印刷上常常先印底色以烘托图纹装潢的高品质以追求商品的高附加值。在实际操作中发现,这样的印刷顺序很容产生油墨晶化现象。到底是什么原因造成的呢?济南宣传单页印刷厂家经过多次的试验,终于找到了导致了印刷出现油墨晶化的原因!
In packaging printing, the background color is often printed first to foil the high quality of decoration in order to pursue the high added value of goods. In practice, it is found that this printing sequence is very tolerant of the phenomenon of ink crystallization. What is the cause? Jinan publicity single-page printing manufacturers after many experiments, and finally found the cause of printing ink crystallization!
一、为了实现底色鲜艳亮丽的目的,一般在印刷时将墨层印得很厚或重印一次或加大印压,燥油也加得较多。虽然墨层完全遮盖了承印载体,但因干燥过快而导致印刷油墨成膜后表面成为十分光滑的墨膜层,好像玻璃一样难以套印精良,使后印上去的油墨印得不平或完全印不上去,罩(叠)印上去的油墨在底色上呈现珠子状或一块块的颜色很弱的印刷图纹,油墨连结很差,有的甚至可以擦掉。印刷界称之为墨膜晶化、玻璃化或镜面化。
First, in order to achieve the purpose of bright background, the ink layer is usually printed very thick or reprinted once or more, and the drying oil is added more. Although the ink layer completely covers the printing carrier, it causes the surface of the printing ink to become a very smooth film layer after film formation due to excessive drying, which is as difficult to overprint as glass, making the inks printed on the back uneven or completely impossible to print, and the inks printed on the cover (stack) are beaded or block by block on the background color. The color of the printing pattern is very weak, the ink connection is very poor, and some can even be erased. The printing industry calls it ink film crystallization, vitrification or mirror.
为了提高图文边缘的清晰度,近年来大多厂家在油墨体系中添加硅油,但过多的硅油往往又会造成墨膜垂直的缩孔。
In recent years, most manufacturers add silicone oil to the ink system in order to improve the clarity of the edges of pictures and texts, but too much silicone oil often causes the vertical shrinkage of ink film.
二、包装印刷油墨的结晶(晶化)主要是油墨体系里颜料的结晶造成的。
2. The crystallization of packaging printing ink is mainly caused by the crystallization of pigments in the ink system.

我们知道,颜料结晶当呈各向异性时,其结晶状态呈针、棒状。墨膜成型时,长度方向容易沿其体系中树脂(连结料)流动方向排列,因而产生较大的收缩;而球状结晶时不存在方向排列,因此收缩小。在包装印刷油墨体系里的无机颜料通常具有球状结晶,例如镉系颜料的包装印刷油墨,其收缩(晶化)也小。

济南宣传单页印刷

We know that when the crystallization of pigments is anisotropic, the crystallization state is needle-like and rod-like. When forming ink film, the length direction is easy to arrange along the flow direction of resin (binder) in the system, which results in larger shrinkage, while there is no directional arrangement in spherical crystallization, so the shrinkage is small. Inorganic pigments in packaging printing ink systems usually have spherical crystals, such as cadmium-based pigments, and their shrinkage (crystallization) is also small.
还有其粒子大小也会影响成型收缩率和成型收缩比,当颜料颗料大至一定程度或小至一定程度时,其成型收缩率和收缩比为更小。另一方面,结晶大呈球晶的树脂成型收缩小,反之结晶大,非球晶则成型收缩大。
The size of the particles also affects the shrinkage ratio and the shrinkage ratio. When the size of the pigment particles is large to a certain extent or small to a certain extent, the shrinkage ratio and the shrinkage ratio are the smallest. On the other hand, the forming shrinkage of resin with large crystalline spherulite is small, whereas that of aspheric crystal is large.
总之,无论是颜色色料的相减混合,还是颜色色光的相加混合,颜料的正确使用不仅与化学结构有关系,很大部分还取决于其物理性能,如晶相粒度分布、凝聚现象,固溶体等影响因素;还应对无机颜料和有机颜料各具有的优缺点作出公平的评价,使二者并存,而后者占有着首要的地位。
In a word, the correct use of pigments depends not only on their chemical structure, but also on their physical properties, such as the size distribution of crystalline phase, condensation phenomenon, solid solution, etc. Whether it is the subtractive mixing of color pigments or the additive mixing of color and light. The advantages of inorganic pigments and organic pigments should also be addressed. Fair evaluation of shortcomings makes the two coexist, and the latter occupies the primary position.
三、有些操作工认为如选择不当,也会引起晶化故障。
3. Some operators believe that improper selection will also cause crystallization failure.
是因底色油墨干得太硬(干透),表面自由能降低了。当前一色印刷好后存放时间太长、车间温度太高或印刷油墨干燥剂太多,尤其是钴干燥剂,它如果采用了快速而激烈的干燥方法,例如烘干等都会产生晶化现象。
It is because the base ink is too hard (dry), the surface free energy is reduced. At present, the storage time of one-color printing is too long, the temperature of the workshop is too high or the drying agent of printing ink is too much, especially cobalt dryer. If it adopts fast and intense drying methods, such as drying, it will produce crystallization phenomenon.
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The above content is provided by the small edition of Jinan promotional leaflet printing. It does not represent the view of this website. If you have any questions, please leave a comment on our official website: http://www.sdhzyw.com. Thank you very much for your love and support.