1. The surface tension of the ink is strong, which is greatly affected by the resin and solvent 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 poor ink flow in the ink tank or circulation pump. When the ink is circulated by the ink pump, the ink flows from the ink tank into the circulation tank, and bubbles are formed in the ink due to the drop and the agitation action of the plate cylinder at high speed.
3. On the printing machine with direct ink supply, the magnetic stirring rod is bent and jumps in the ink tank to cause bubbles.
4. Add an appropriate amount of defoamer. Although there are special defoamers, too much has an adverse effect on the properties of the ink. If it is used improperly, it will cause bubbles, so it cannot be used more.
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