Reasons and effects of foaming in water-based varnish
Reason for foaming
Stirring and Mixing: Intense mechanical stirring introduces a large amount of air, forming bubbles.
Solvent evaporation: The solvent in water-based varnish also carries away some liquid during the evaporation process, forming bubbles.
Temperature and humidity: In high temperature or high humidity environments, the surface tension of coatings decreases, making them more prone to foaming.
Improper substrate treatment: Impurities such as water and oil on the surface of the substrate can also cause blistering of the coating.
impact analysis 

Appearance quality: if the foam is not completely eliminated, the surface of the coating will be uneven, affecting the appearance.
Performance degradation: the presence of foam may reduce the adhesion, hardness, weather resistance and other properties of the coating.
Construction difficulty: too much foam will increase the difficulty of spraying, and even lead to the blockage of the spray gun.
Cost increase: In order to solve the foam problem, it may be necessary to increase the amount of defoamer or adjust the production process to inc