planetary gearbox conveyors are 
used when material is to be moved frequently between specific points over a fixed route and when there exists a sufficient flow volume to justify the fixed conveyor purchase.[4] Various kinds of conveyors can be characterized by the kind of product being managed: unit load or mass load; the conveyor’s location: in-floor, on-ground, or overhead, and whether loads can accumulate on the conveyor. Accumulation allows intermittent movement of each unit of materials transported along the conveyor, while all models move at the same time on conveyors without accumulation capability.[5] For instance, while both the roller and flat-belt are unit-load on-floor conveyors, the roller provides accumulation capability as the flat-belt will not; similarly, both power-and-free and trolley are unit-load overhead conveyors, with the power-and-free made to include an extra track to be able to provide the accumulation capability lacking in the trolley conveyor. Examples of bulk-handling conveyors include the magnetic-belt, troughed-belt, bucket, and screw conveyors. A sortation conveyor program can be used for merging, identifying, inducting, and separating products to be conveyed to particular destinations, and typically contains flat-belt, roller, and chute conveyor segments together with various moveable arms and/or pop-up tires and chains that deflect, push, or pull products to different destinations.[6]
