Color-coated plate shrinkage refers to the phenomenon t […]
Color-coated plate shrinkage refers to the phenomenon that small pits are formed on the surface of the color-coated roll after the paint is baked. The reason for the shrinkage phenomenon is that the high surface tension of the coating will cause the shrinkage phenomenon of the coating film. Coated sheet suppliers This problem is quite common in the actual application of the coating, mainly because the coating has poor wettability to the substrate. If the surface tension of the paint is too large to make the wet film unable to form a uniform coating before drying, it will cause the substrate to be exposed in severe cases, resulting in shrinkage. Generally, there will be more shrinkage.
First, the substrate should be cleaned as much as possible before coating the surface of the color-coated plate to reduce the impact of oil and dust particles on the substrate on the performance of the coating;
The second is to use surface tension control agents or some solvents with better wetting effects to reduce the surface tension of the coating and make it close to the free performance of the substrate surface.