In the printing process, gold ink is often used. Gold can play a finishing touch, but the absorption and transferability of gold ink is worse than that of ordinary ink. Therefore, many problems will be encountered in the printing process, resulting in various factors of unstable quality. When using gold ink, the printability of the gold ink must be properly adjusted. During the printing process, pay attention to the transfer effect of the gold ink. The running speed of the printing machine should not be too fast. The ink transfer roller should always be in the best state. It is conducive to the ink to be transferred to the surface of the printing plate and the substrate intact and even. Get better results.
There are many quality failures encountered in the process of gold ink printing, which are mainly manifested in matt imprinting, enlarged imprinting, pasting and imprinting.
Matt
â‘ Chemically unstable. When the gold ink is exposed to moisture, heat, contact with acids or alkalis, or exposed to the air, it will easily undergo chemical reactions, which will make the gloss damaged and darkened and lack brightness. Therefore, the gold ink should be protected from heat, moisture, and exposure during storage, and avoid contact with acid and alkali substances.
â‘¡The printing machinery is not clean. In the printing process of gold ink, due to the high-speed operation of the ink roller, the friction and heat for a long time accelerate the oxidation speed of the gold ink, which causes the ink to become dark and dark. Under normal circumstances, the printing press in Shanghai must clean the rubber roller (including the water roller) every 4 hours of continuous operation, then replace it with new ink to keep the ink fresh and shiny.
â‘¢ The storage time of the formulated ink is too long. When mixing gold ink, it should be adjusted as little as possible. Generally, it is better to keep the dosage of 3 to 4 hours. The time between the gold ink and the use of the ink is too long to oxidize and deteriorate, and the color becomes dark, which affects the gloss of the product.
â‘£The smoothness of the printing material is poor. The printing material has poor smoothness and rough surface. After the gold ink is transferred to the surface, it will be penetrated into the fiber immediately, making the surface of the ink layer tarnished.
⑤ The speed of the machine is too fast. The running speed of the machine is too fast, and the heat generated by friction is too high, which accelerates the oxidation of the gold ink and loses its luster. Therefore, when printing gold ink, the machine speed is slower than printing other color inks.
Imprint enlargement, paste version
â‘ The amount of ink supply is too large. Too much ink output from the ink fountain causes the ink layer on the surface of the ink roller to be too thick. Shanghai Printing Company transferred to the surface of the printing plate, and the graphic parts could not bear the excessive ink. Under the effect of the printing pressure, it must inevitably expand to the edge of the imprint, or the phenomenon of pulling ink and gluing occurred. The amount of ink should be controlled in time, and the excess ink layer on the surface of the ink roller should be removed, and then the ink should be printed evenly.
â‘¡ The printing pressure is too heavy. Improper adjustment of the machine pressure or due to the wrong pad method will cause the mechanical pressure to be too heavy, the pressure is too heavy, the ink marks on the graphics will expand to the edge, or even paste. The pressure must be readjusted.
â‘¢The drying is too slow or the finished product is too thick. Because the ink that dries too slowly causes the imprint to expand, paste, and even sticky under the action of excessive product accumulation and gravity; during operation, an appropriate amount of desiccant should be added to the ink.
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