During the printing process, the ink in the ink tank generates a large number of bubbles, which are attached to the plate cylinder, so that some of the dots on the pattern disappear, and white spots appear on the printed matter. Why are there bubbles in the ink? This article is analyzed one by one for reference.
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 the 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 air bubbles.
4 , add 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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