Trommel screen has wide range of sizes and capacities,it is a mechanical screening machine used to separate materials.It consists of a perforated cylindrical drum that is normally elevated at an angle at the feed end,motor,reduction unit,screen frame and sealing cover.When materials flow towards along the inclined rotating drum,materials jump and roll,he undersized material smaller than the screen apertures passes through the screen, while the oversized material exits at the other end of the drum.