The SCM-4 series 4 Components Volumetric Dosers are suitable for auto-proportional mixing of new materials, regrinds, master batch and additives. A brushless DC motor is used in this series and touch screen plus PLC control are used. The operator controls the precise dosing screw by setting its rotation speed to extrude materials with an accuracy of ±1%. A gear motor with deceleration ratio of 38:1 or 75:1 is coupled to a dosing screw of 12, 14 or 16mm diameter. Clients are free to choose gear motor with different deceleration ratio and different screw diameters.