Materials handling in the food and processing industries is concerned with the movement of materials in different cases such as from supply point to store or process, between stages during processes or to packing and distribution. One of the main types of handling equipment is conveyors. Motion of the material can be caused either by gravity or manually or by power. The method of motion provides a convenient basis for subdividing the types of conveyors into two main groups as follows: i) gravity or manually moved- chute, roller, or skate-wheel conveyors and ii) powered - roller, belt, slat, chain, vibratory, magnetic, screw, flight and pneumatic conveyors. The above categories include all the possibilities of materials handling within a processing plant, i.e., either bulk or packed.