1、高溫烘烤后油墨變色
1. Ink discoloration after high temperature baking
印鐵油墨屬于熱固化油墨，對其技術請求其中一條就是高溫烘烤后顏色不變。但在實踐消費中，有些色相的油墨經烘烤后還是或多或少有些變色，例如，白墨、沖淡墨以及用大量白墨、沖淡墨分配而成的墨等，這些油墨經屢次烘烤會發作黃變，特別是用大量沖淡劑分配出的專色墨，屢次烘烤后顏色變化會很大。例如，用大量沖淡劑參加藍墨分配而成的淺藍專，屢次烘烤后淺藍專可能變成深藍專。工藝籌劃者在制定印刷工藝時就應該充沛思索，盡量把這些京屢次烘烤變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上光前后顏色變化
2. Color change before and after polishing
印刷后一道工序是上光油，上光油的目的一是為了維護圖案，避免損傷;二是進步光澤度，增加美觀。普通來說，印鐵光油經高溫烘烤后都會黃變，加之光油層對光的反射率變大，所以上光后油墨的顏色普通會比上光前亮些。但是有些光油含有增白劑，在光照下顯藍色，因而運用這種光油的產品上光后油墨顏色會比原來偏藍，總體色相是油墨自身顏色與光油偏藍色的疊加。
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、金屬色專色油墨氧化后顏色變化
3. Color Change of Metal Spot Color Ink after Oxidation
印鐵金、銀墨是由金、鋁等金屬粉末來顯色的。其中印鐵金墨是由經研磨加工的銅粉調制而成的印刷油墨;印鐵銀墨是由經研磨加工的鋁粉調制而成的油墨。印鐵金、銀墨中金銀粉的化學性能普通不夠穩定，當遇到酸、堿、水汽、硫化物氣體和碳酸氣體時，就會產生化學反響，使印品墨色缺乏金屬色澤。其中金屬的變色規律是由金黃色變成棕紅色，繼而變成偏黑色。由于銅在初氧化時可生成紅色氧化亞銅，進一步氧化后便變成黑色氧化銅;此外，金粉在含碳酸氣較濃及濕氣較大的工藝條件下，容易變成堿式碳酸銅，于是印品上的金墨遍逐步變暗。銀墨變色之后則成偏灰色，缺乏銀光金屬質感。
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、印刷墨層厚度不同
4. Different Thicknesses of Printing Ink
我們曉得，同一個油墨印刷厚度不同，其表現出來的顏色也不同。在實踐印刷中，墨層的厚度是靠印刷壓力和墨量幾來控制的，普通來說，印刷壓力調理合理后是不會改動的，因而，印刷中墨層的厚度和平均性是經過控制墨量幾來完成的。國內大多數印鐵機還是靠手工調理給墨量螺絲來控制給墨量的，由于人為調理遭到很多要素的影響，所以印刷出的墨層可能厚度不平均，油墨的顏色也會深淺不一，色相與規范色稿有差別。
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.
在實踐消費中，以上這些影響印鐵油墨顏色變化的要素都會碰到，這就請求操作者理解并控制這些要素的變化規律，然后依據實踐狀況，分配恰當的油墨比例，制定合理的印刷工藝，減少反復印刷油墨顏色變化，這有利于節約停機時間，進步消費效率。所謂世上無難事只怕有心人，在上海印刷這個范疇，上海豪禾印務以的印刷設計功底專注于為客戶提供效勞，在任何一個有關印刷的細節上我們都秉承著“每走一步，想到的是顧客”的效勞理念，力爭在保證質量的前提下將本錢控制到低，這項印刷工作也是任何印鐵企業應該注重、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.
Thank you for your reading and watching. The wonderful content of this article comes from: Jinan handbag printing, we will continue to show you more wonderful content. For more details, please click: http://www.seven2000.com.
