Conveyors are used when planetary gearbox materials is to be moved frequently between specific points over a set route and when there is a sufficient flow quantity to justify the fixed conveyor investment.[4] Various kinds of conveyors can be characterized by the kind of product being handled: unit load or mass load; the conveyor’s area: in-floor, on-ground, or overhead, and whether loads can accumulate on the conveyor. Accumulation enables intermittent movement of each unit of materials transported along the conveyor, while all units move simultaneously on conveyors without accumulation capability.[5] For example, while both roller and flat-belt are unit-load on-floor conveyors, the roller provides accumulation capability as the flat-belt does not; similarly, both the power-and-free and trolley are unit-load overhead conveyors, with the power-and-free made to include a supplementary track in order to provide the accumulation capability without the trolley conveyor. Types of bulk-handling conveyors include the magnetic-belt, troughed-belt, bucket, and screw conveyors. A sortation conveyor system is used for merging, determining, inducting, and separating items to end up being conveyed to particular destinations, and typically contains flat-belt, roller, and chute conveyor segments as well as various moveable hands and/or pop-up tires and chains that deflect, push, or pull products to different destinations.[6]