Control color bags is tonal, from the start

In the process of composite packaging printing, color printing ink film color bags mainly depends on the concentration and the transfer rate of printing ink in the work of. For some specific substrate or in terms of the specific work in ink, work in ink concentration is relatively fixed, depending on factors such as the viscosity of the ink transfer rate, but also affected by factors such as printing speed. 1, temperature and humidity changes at room temperature, liquid temperature such as substantial changes of ink, move the flow state change occurs, color will change accordingly. This is because caused by temperature changes affect the ink viscosity. At the same time, high temperature and low humidity dry weather to highlight parts of the printing ink transfer rate will have a significant impact. When printing a high grade product no matter how to the printing workshop temperature and humidity control. In the winter to use ink to preheat in advance in order to reduce the temperature of the ink itself changes. 2, synthesis of color separation, this scene, in the light and color of organic and inorganic pigments such as specific gravity difference is easy to occur in the melange of of all kinds. Especially ink plate printing ink flows too slowly, the precipitation will promote the synthesis of color separation, so should pay attention to make the ink circulation fluid. In addition when mixing inadequate in color, with the printing, the concentration of a certain color have higher bias, should use dissolved before the formal printing machine, such as mechanical, or other methods are sufficient mixing. 3, now color tended to ink metamorphism and worse because of long time printing, printing ink solvent composition change, or mixed with water in the air caused ink printing ink metamorphism, make the color now. In order to prevent because of heat of vaporization caused by the temperature drop, can using slow drying solvents. In the high temperature high humidity, there may be a certain amount of water mixed with ink, and therefore should be added at the time of onset of strange new ink, or all of the change, using several times with ink because in a lot of dust, should be regularly to filter or abolished. 4, ink viscosity and drying speed change ink work viscosity changes can directly affect the color of color bags. High viscosity, color density is relatively high, and viscosity at low concentration is relatively low. This influence is sometimes ten show clearly, must draw high attention. Because the requirement of printing process, viscosity ink work wants moderate. Ink stick through the age goes against transfer of ink, prone to paste version. The color of the ink stick through the hours, print is easy to appear electrostatic phenomenon, but also not conducive to the control of ink. By the changes of viscosity, ink migration or the flow of the network flow method and the advection is the area of subtle effect, special is more pronounced in multicolor printing. When printing speed must be so, for the viscosity of the ink from beginning to end, had better use viscosity automatic control instrument. Ink solvent ratio in the change, ink drying speed will change work, thus affect the ink transfer rate and printing color. About some use less ink, the ink tank in use after a period of time, because natural volatile solvent, not only affect the ink viscosity, can also affect the solvent ratio and speed of volatile, so be added solvent in a timely manner