[Defect analysis] A lot of bubbles are generated in the ink, what's going on?

1. The surface tension of the ink is strong, which is greatly affected by the resins and solvents used in the ink. Sometimes the viscosity of the ink is large, and bubbles are easily generated.

2. The ink tank or circulation device is defective. A large number of bubbles are caused by the poor flow of ink in the ink tank or circulation pump. When the ink pump is used to circulate the ink, the ink flows from the ink tank to the circulation barrel. Due to the drop and the stirring action of the plate cylinder at high speed, bubbles will form in the ink.

3. On the printing machine that directly supplies ink, the magnetic stirring rod bends and jumps in the ink tank, causing bubbles.

4. Add appropriate amount of defoamer. Although there are special defoamers, too much adversely affects the properties of the ink. Improper use will cause bubbles, so it can not be used more.

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