SCM series volumetric dosers are suitable for auto-proportional mixing of virgin materials, regrinds, master- batch or additives. A gear motor with gear ratio of 38 : 1 or 75:1 is coupled to a dosing screw of 12, 14 or 16mm diameter to give a total of six models with output. ranging from 0.1~32kg/hr. Double color dosers can be assembled from two single color dosers if required. Five components automatic mixing can be realized if customers adopt four color dosers.