Gold can give people a gorgeous and noble feeling, and the metallic colors of golden light can't be expressed by spectral colors. Therefore, gold ink printing is widely used in packaging decoration printing process, which plays a better role in improving the image of goods. However, because the main raw material of gold ink is brass powder, it is chemically an active metal and is prone to discoloration. Therefore, we should pay attention to the following conditions when printing gold ink: ①Gold ink is easy to come into contact with air and water vapor and cause a chemical reaction to cause discoloration. Therefore, it is necessary to take care of the storage of gold powder, not to expose it to the air, and cover the unused gold powder tightly; ②Because the chemical properties of the gold powder are not stable enough, if they are in contact with acids, alkalis, carbon and sulfides, different degrees of chemical changes will occur. If the metallic gloss is reduced, the gold ink will turn black. Moreover, gold ink should be avoided for printing large-area domestic coated paper and offset paper, because the paper produced by the acid papermaking process is acidic, and the gold ink will not only change color after printing, but also lose gloss; ③ The auxiliary materials for the preparation of metal ink should not use acid-containing auxiliary materials, but should be prepared with neutral substances; ④The use of gold ink should follow the principle of adjusting with printing, that is, the amount of one-time preparation should be suitable for continuous printing for about 3 hours, so as to avoid too much adjustment and make the gold powder in the oil for too long, and it will oxidize and deteriorate in contact with air and lose its golden luster ; ⑤ The speed of the gold ink printing should not be too fast, because the frictional heat of the ink roller will increase correspondingly when the machine rotates fast, so that the gold ink will be easily oxidized and blackened. Therefore, the speed of printing gold should be controlled at about 3000 sheets / h; ⑥The fountain solution for offset printing gold should use fountain solution containing acid or gum to avoid the acidic fountain solution reacting with the gold powder, so that the ink color of the printing becomes dark and tarnish; ⑦The rubber roller should be adjusted when printing gold, and the position of each rubber roller should be adjusted accurately, so as to avoid the accumulation of ink during the printing process due to poor ink transfer, so that the gold powder stays on the rubber roller for a long time, causing the gold ink to oxidize and change color ; ⑧The semi-finished products of printed gold ink should not be stacked too much, otherwise the heat released by the gold ink during the drying process of the paper cannot be dissipated as soon as possible, and the gold ink will be oxidized and discolored; ⑨When the machine ink fountain and ink roller have just been cleaned with kerosene and gasoline, and the organic solvent remaining on the surface has not been completely volatilized, gold ink printing is performed immediately, so that the gold ink reacts with the solvent to cause discoloration; ⑩If printing gold on the background color, please pay attention to adding appropriate dry oil in the background color, so as not to overprint the gold ink because the bottom ink is not dry, which will affect the gloss color of the gold ink. In summary, there are many reasons for the discoloration of gold ink. As long as we correctly understand and master the characteristics and printability of gold ink, take reasonable and scientific process measures, which can not only effectively prevent the discoloration of gold ink, but also better Improve the quality of printing gold. Our Pvc Shower Curtain is using non-toxic PVC material, this 100% environmental friendly material with safe printing doesn't release any unpleasant smell, which guarantee a good and safe environment of your bathroom. It is waterproof, anti-bacterial and mildew resistant.12 Rust-resistant metal grommets with 12 piece C Type hooks.Classic design & Durable characteristics are just for your home life.
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Several issues need to pay attention to when printing gold ink