1、高温烘烤后油墨变色
1. Ink discoloration after high temperature baking
印铁油墨属于热固化油墨，对其技术请求其中一条就是高温烘烤后颜色不变。但在实践消费中，有些色相的油墨经烘烤后还是或多或少有些变色，例如，白墨、冲淡墨以及用大量白墨、冲淡墨分配而成的墨等，这些油墨经屡次烘烤会发作黄变，特别是用大量冲淡剂分配出的专色墨，屡次烘烤后颜色变化会很大。例如，用大量冲淡剂参加蓝墨分配而成的浅蓝专，屡次烘烤后浅蓝专可能变成深蓝专。工艺筹划者在制定印刷工艺时就应该充沛思索，尽量把这些京屡次烘烤变色的油墨放在后印刷。
Iron printing ink belongs to heat curing ink. One of its technical requirements is that the color of the ink remains unchanged after baking at high temperature. However, in practical consumption, some color inks are more or less discolored after baking, for example, white ink, diluted ink and ink distributed with a large number of white ink and diluted ink. These inks will yellowish after repeated baking, especially the spot color inks distributed with a large number of diluents, and the color will change greatly after repeated baking. For example, light blue specialty, which is participated in by a large number of diluents in the distribution of blue ink, may become dark blue specialty after repeated baking. Technological planners should give full consideration to the formulation of printing technology, and try to put these Beijing baked and discolored ink in the final printing.
2上光前后颜色变化
2. Color change before and after polishing
印刷后一道工序是上光油，上光油的目的一是为了维护图案，避免损伤;二是进步光泽度，增加美观。普通来说，印铁光油经高温烘烤后都会黄变，加之光油层对光的反射率变大，所以上光后油墨的颜色普通会比上光前亮些。但是有些光油含有增白剂，在光照下显蓝色，因而运用这种光油的产品上光后油墨颜色会比原来偏蓝，总体色相是油墨自身颜色与光油偏蓝色的叠加。
The last process of printing is polishing oil. The purpose of polishing oil is to maintain the pattern and avoid damage. The second is to improve the gloss and beauty. Generally speaking, the printing polish will yellowing after baking at high temperature, and the reflectivity of the polishing oil layer to light will be greater, so the color of the ink after polishing will generally be brighter than before polishing. However, some polishes contain whitening agents, which show blue under light. Therefore, after polishing with this polish, the ink color will be bluer than before. The overall color phase is the superposition of the ink color and the light oil bluer.
3、金属色专色油墨氧化后颜色变化
3. Color Change of Metal Spot Color Ink after Oxidation
印铁金、银墨是由金、铝等金属粉末来显色的。其中印铁金墨是由经研磨加工的铜粉调制而成的印刷油墨;印铁银墨是由经研磨加工的铝粉调制而成的油墨。印铁金、银墨中金银粉的化学性能普通不够稳定，当遇到酸、碱、水汽、硫化物气体和碳酸气体时，就会产生化学反响，使印品墨色缺乏金属色泽。其中金属的变色规律是由金黄色变成棕红色，继而变成偏黑色。由于铜在初氧化时可生成红色氧化亚铜，进一步氧化后便变成黑色氧化铜;此外，金粉在含碳酸气较浓及湿气较大的工艺条件下，容易变成碱式碳酸铜，于是印品上的金墨遍逐步变暗。银墨变色之后则成偏灰色，缺乏银光金属质感。
Printed iron, gold and silver inks are colored by metal powders such as gold and aluminium. Among them, iron-gold ink is a printing ink made of grinding copper powder; iron-silver ink is an ink made of grinding aluminum powder. The chemical properties of gold and silver powders in iron and silver inks are generally not stable enough. When acid, alkali, water vapor, sulfide gas and carbonate gas are encountered, chemical reactions will occur, resulting in a lack of metallic color in ink. Among them, the discoloration of metals changes from golden yellow to brown red, and then to black. Because copper can produce red cuprous oxide when it is first oxidized, it will turn into black cuprous oxide when it is further oxidized. In addition, gold powder is easy to turn into basic cuprous carbonate when it contains more carbonate gas and more humidity, so the gold ink on the printed products gradually darkens. Silver and ink turn grey after discoloration, lacking the silvery metallic texture.
4、印刷墨层厚度不同
4. Different Thicknesses of Printing Ink
我们晓得，同一个油墨印刷厚度不同，其表现出来的颜色也不同。在实践印刷中，墨层的厚度是靠印刷压力和墨量几来控制的，普通来说，印刷压力调理合理后是不会改动的，因而，印刷中墨层的厚度和平均性是经过控制墨量几来完成的。国内大多数印铁机还是靠手工调理给墨量螺丝来控制给墨量的，由于人为调理遭到很多要素的影响，所以印刷出的墨层可能厚度不平均，油墨的颜色也会深浅不一，色相与规范色稿有差别。
We know that the same ink has different printing thickness and different color. In practical printing, the thickness of ink layer is controlled by printing pressure and ink quantity. Generally speaking, the printing pressure can not be changed after adjusting reasonably. Therefore, the thickness and evenness of ink layer in printing are accomplished by controlling ink quantity. Most of the domestic iron printers still rely on manual adjustment of ink feeding screw to control ink feeding. Because artificial conditioning is affected by many factors, the printing ink may be uneven thickness, ink color will be different, color and standard color manuscripts are different.
在实践消费中，以上这些影响印铁油墨颜色变化的要素都会碰到，这就请求操作者理解并控制这些要素的变化规律，然后依据实践状况，分配恰当的油墨比例，制定合理的印刷工艺，减少反复印刷油墨颜色变化，这有利于节约停机时间，进步消费效率。所谓世上无难事只怕有心人，在上海印刷这个范畴，上海豪禾印务以的印刷设计功底专注于为客户提供效劳，在任何一个有关印刷的细节上我们都秉承着“每走一步，想到的是顾客”的效劳理念，力争在保证质量的前提下将本钱控制到低，这项印刷工作也是任何印铁企业应该注重、常抓不懈的根底工作。
In practical consumption, the above factors affecting the color change of printing ink will be encountered, which requires operators to understand and control the changing rules of these factors, and then according to the actual situation, allocate the appropriate proportion of ink, formulate a reasonable printing process, reduce the color change of repeated printing ink, which is conducive to saving downtime and improving consumption efficiency. In the field of Shanghai Printing, Shanghai Haohe Printing concentrates on providing brand service to customers with professional printing design. In every detail about printing, we adhere to the service concept of "every step, the first thing we think of is customers", striving to control the cost to the minimum under the premise of guaranteeing quality. Work is also the fundamental work that any iron-printing enterprise should pay attention to and constantly grasp.
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