In the printing industry, the quality of ink directly affects the quality and efficiency of production. So how to use the properties of good ink to achieve the best results? In fact, if we make good use of various types of ink additives, we can make our printed products more stable in quality, and can also make up for the shortcomings of printing plates, films and equipment.
Ink additives can help the ink to achieve the highest performance and quality, and print the best quality products. There are many types of ink auxiliaries. Today I will introduce the characteristics of 8 common ink auxiliaries and the matters needing attention in the use!
Thinner
The ink viscosity is high. At this time, we need low viscosity and can not change color. How should we deal with it? When the viscosity of the ink is high, although the viscosity drops after adding water, the color also becomes lighter, and the desired effect cannot be achieved. The correct approach is to add an appropriate amount of thinner to adjust. As long as the amount of thinner does not exceed 3%, it will not cause changes in ink color and PH value, so we cannot easily add water. If too much ink is added to the thinner and foam will appear, this time you can add a defoamer.
Diluent
What should I do when ink with light color and high viscosity is needed? If you want to make the ink lighter, it is often illegal. If you add water to the ink, the color will fade, but the viscosity will also drop, and the printing will appear white. When the color is dark, we can add diluent. Note that if more diluent is added, the ink viscosity will rise. At this time, a small amount of thinner can be added to adjust.
Slow drying agent
The ink dries easily during printing. Drying too fast will cause the ink to dry on the printing plate during the transfer process and block the plate, and the phenomenon of defective marks will also occur, and the mesh of the anilox roller will also be blocked. At this time, we need to add an appropriate amount of slow-drying agent to adjust, the amount can not be higher than 10%. If too much slow-drying agent, it will cause the ink drying time to slow down, causing deinking, unclear printing and other quality problems.
Quick-drying agent
In the printing process, when we encounter poor overprinting, poor printing level, how to deal with slow drying? This is caused by the ink drying time being too slow. When faced with the above situation, we can add a quick-drying agent to the ink to increase the drying speed of the ink, the amount of addition should not exceed 3%. Too much quick-drying agent will lead to the dry solid printing plate during the ink transfer process, reduce the transferability of the ink, and cause undesirable phenomena such as printing dew.
Defoamer
This solvent should be often used on the machine. Most of the foam will have printing burrs and other phenomena, which also directly affect the printing quality, so when the ink is foaming, you can add an appropriate amount of solvent to defoam. The general ratio is 1-2 ‰. If too much defoamer is added, it will cause pinholes in the printed content, which will directly lead to the failure of printing operations.
PH value
The ph value refers to the ratio of the total number of hydrogen ions in the solution to the amount of total substances. The pH range is 0-14, and the pH of the water is 7, which is neutral. When ph <7, the solution is acidic, and the smaller the ph, the stronger the acidity. When ph> 7, the solution is alkaline, and the greater the ph, the stronger the alkaline. The PH value of our ink is generally maintained between 8.5-9.5, the impact is not very large when printing ordinary products, but it is very useful when printing high screen lines and overprinted products. If the PH value of the first color is higher than that of the second color during color stacking, poor color stacking will occur, and the ink of the second color cannot cover the first color, so in principle, the PH value of the ink is from high to low, and the viscosity is Bottom to high.
Thickener (tackifier)
When the viscosity of the ink is too low, printing will appear printing white, halo, water marks and other phenomena. Such phenomena will especially appear in residual ink. When the viscosity is low, we can increase the viscosity of the ink to increase the viscosity of the ink. If the viscosity of the ink is adjusted too high, there will be many problems, such as unclear printing, deinking and so on. So we have to find the best viscosity for our products and equipment. Low viscosity and high density inks are the best. The amount of thickener should be controlled at 0.5-1%, not too much.
Leveling agent (coloring agent)
During the printing process, due to the excessive fluidity of the ink, there will be poor color overlapping, the printing pattern is not clear, the ink color is not full, and other problems. When such a problem occurs, an appropriate amount of leveling agent can be added to adjust, especially for the effect of false color overlapping .
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