The three-roll grinding machine, which is also known as three-roll mill, is a cosmetic machinery to grind different kinds of ingredients such as printing ink and pigments. Thus, it is widely used in the production of cosmetic, ink, food, drink and so on. The liquid phase will be improved through a series of cutting and grinding. Basically, there are three horizontal rolls in the machine: feeder, center and apron. When the cosmetic machinery begins to work, three rolls will rotate in the opposite direction and the different speeds, through which the high shear will be produced. With the high shear force, the phase will be mixed, refined, dispersed or homogenized effectively.