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In the process of paint coating, the defects of the paint film will occur, which are generally related to the state of the article to be coated, the selected paint, the coating method and operation, the painting process, equipment and environment. According to our company's past experience, in general, the reasons for sag are as follows:
(1) The viscosity of the coating is too low and the coating is too thick;
(2) The spraying distance is too close, and the spraying speed is too slow;
(3) The coating is not fully removed during the coating and dip coating;
(4) The spray air pressure is not uniform;
(5) The surface of the object is uneven, the surface is not well treated, and it contains oil and water.
Control method:
(1) Dispensing the viscosity of the paint, each lane should not be too thick;
(2) Maintain a certain spraying distance and control the appropriate spraying speed*;
(3) Remove excess paint; keep the air pressure stable during construction;
(4) Handle the surface without water or oil