How to solve the bubble phenomenon of gravure ink

During the printing process, the ink in the ink tank produces a large number of air bubbles, and these air bubbles adhere to the plate cylinder, so that some dots on the pattern disappear, and white spots appear on the printed product.cause:1The surface tension of the ink is strong, and it is greatly affected by the resin and solvent used in the ink. Sometimes the viscosity of the ink is high, and it is easy to generate air bubbles. 2, the ink tank or the circulation device is defective. A large number of air bubbles are caused by poor ink flow in the ink tank or circulation pump. When using the ink pump to circulate ink, The ink flows from the ink tank to the circulation barrel. Due to the drop and the stirring effect of the printing plate cylinder at high speed, air bubbles will be formed in the ink China. 3, On the printing press with direct ink supply, the magnetic stirring rod bends and jumps in the ink tank, causing air bubbles. 4, Add an appropriate amount of defoamer. Although there are special defoamers, most of them have adverse effects on the properties of the ink. Improper use will cause bubbles, so they cannot be used more often.