1. Too much defoamer in the ink: too much defoamer in the original ink itself, or too much defoamer in the ink. The solution is to replace the ink, or replace it with a new one without defoamer, or contact the ink company for a solution.
2, defoamers and printing inks are not compatible, the solution is the same as above.
3. The surface tension of the printed material is too high compared to the surface tension of the ink and is in contact with the ink company.
4, too much foam in the ink. Need to eliminate foam, or replace ink.