1, the flow of hydrophilic coatings is slow, because the coating is a thixotropic fluid, in which there is a reticulation and yield value, yield value and viscosity are the two main factors that cause the buildup of coatings. The yield value and viscosity are the two main factors that cause the paint buildup. The yield value of the paint is too high, and the viscosity is too large, resulting in poor flow of the paint.
2, the flow of paint in the flow process of flow marks, along the sand flow, encounter grooves will produce a buildup, resulting in sand corners are not clear.
3, the angle of inclination of the sand mold is not appropriate.
4, the flow is small, the paint can not flow to cause accumulation.
5, the flow rate is slow due to insufficient pressure, resulting in buildup.