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 printing suitability 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. 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 ①Chemically 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. ②The 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. In general, every 4 hours of continuous operation of the printing press, the rubber roller (including the water roller) must be thoroughly cleaned, and then replaced with new ink to keep the ink fresh and shiny. ③ 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. ④The 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 ①The 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. Transferred to the surface of the printing plate, the graphic part can not bear the excessive ink, under the action of the printing pressure, it will inevitably expand to the edge of the imprint, or the phenomenon of pulling ink and gluing occurs. If the amount of ink is too large or the ink is too sticky, it should be timely To control the amount of ink delivery, the excess ink layer on the surface of the ink roller should be removed, and then the ink should be printed evenly. ② 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. ③The 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. Blotted hair, bare bottom ①The smoothness of the printing material is poor. The printing material has poor smoothness and the surface is rough and uneven, which makes it easy for the graphic ink layer to be exposed and the imprint is not smooth. The ink color is uneven. Appropriate background color treatment, increase printing pressure and the amount of ink delivery, can improve the quality of gold ink imprint. ② The printing pressure is not ideal. The printing pressure is too light or uneven, resulting in an uneven layer of graphic ink: the ink layer floats on the surface of the printing material. The particles of the gold ink are relatively coarse. To make it transfer to the surface of the substrate smoothly and evenly, it must be compacted and flattened, and the pressure should be properly increased to make it even and firm. Or thick line version, usually use the method of overprinting or two-time printing to solve the phenomenon of false exposure. ③The adaptability of the ink roller is poor. The roundness of the ink roller is uneven, and the flexibility, viscosity and elasticity are poor, so that the gold ink cannot be transferred to the surface of the printing plate and the substrate in the process of transfer. Make the graphic ink layer not full, which affects the printing quality. Before printing, all the ink rollers must be properly maintained and maintain good printability, so as to create conditions for improving the quality of gold ink printing. ④The ink layer is uneven. The gold ink is adjusted too thin, the consistency is poor, the transfer effect is poor, the ink supply is not uniform, causing the ink layer to be too thin, affecting the quality. During the printing process, the thinness of the gold ink should be adapted to the printability. Keep the ink layer in a uniform state to prevent the blotting from becoming false and showing the bottom. double chaise lounge,Chaise Lounges,leather lounge chaise Guangzhou LoPhiDa Co.Ltd , https://www.gdwidinlsa.com