Loesche Mill Principle of operation, design and functioning Principle of operation The grinding material is comminuted in the Loesche roller grinding mill between the rotating horizontal grinding track and the stationary grinding rollers. Grinding is effected primarily by compression. A certain amount of shear force increases the quantity.Simultaneous Grinding and Drying. Williams roller mills can perform simultaneous grinding and drying functions with one continuous operation. The roller mills simultaneous grinding and drying features are typically for materials with higher moisture such as limestone and clay. about the Williams machines capable of simultaneous.