What is the cause of water based ink foaming? Why use defoaming agent for water based ink?

Water Based Ink is especially suitable for printed matter, but many printers who use water based ink will encounter the problem of ink foaming, and the generation of these bubbles will reduce the production efficiency, resulting in a series of hazards such as printing surface defects and incomplete printing of patterns on printed paper. At this time, in order to completely eradicate the existence of bubbles, defoaming agent manufacturers try their best to develop a solution-special defoaming agent for water based ink to solve this problem.

Causes of foaming of water based ink;
1. The printing speed is too fast;
2. Adding too much tap water with high hardness, the surface tension of ink solvent varies;
3. The air pressure difference is large;
4. The ink has high viscosity, and the air pressure cannot be released.
5. Excessive circulating stirring;
6. It is easy to foam when the pH value is lower than 8.5.
Harm of water based ink foaming;
1. The printing quality can only be guaranteed if the ink texture is uniform, and the uniformity will be destroyed by foaming.
2. Foaming will reduce production efficiency.
3. It causes defects on the printing surface, and the patterns on the printed paper cannot be printed completely.
4. After the foam in the bath overflows, the foam flows into the roller, wetting the printing paper, and the printing machine cannot work normally.
Solution:
Most of the causes of water based ink foaming are caused by chemical reaction, so it is recommended to use a chemical method-defoaming agent special for water based ink to solve the foaming problem. The defoaming agent special for water based ink has a special effect on the foam produced by ink, especially on micro-foam, and has the advantages of less dosage, long foam suppression time and good water dispersibility. This product has good compatibility with ink, and will not affect the film-forming property and cause problems such as shrinkage cavity and fisheye. It is effective for defoaming agents such as various inks, emulsion synthesis, rubber industrial polymerization, coagulation degassing process, polymer glue, styrene-butadiene emulsion and emulsion polymerization.