In this experiment Yield value (v), Plastic viscosity (U) and Leveling index (L. I) are determined by Brook-field visco-meter.
It is necessary that coating color has thixotropic property to get smooth coating surface by the Multiple Roll Coater.
When the coating color leveling index is over 0.34 and its ratio of v/U is over 13 the coating surface keeps less orange peel or pattern.