Conveyors are used when material is to be moved frequently between particular points over a set path and when there is a sufficient flow quantity to justify the fixed conveyor expenditure.[4] Different types of conveyors can be characterized by the type of product being taken care of: unit load or bulk load; the conveyor’s area: in-floor, on-ground, or overhead, and whether or not loads can accumulate on the conveyor. Accumulation allows intermittent movement of every unit of material transported along the conveyor, while all units move at the same time on conveyors without accumulation capability.[5] For example, while both the roller and planetary gearbox flat-belt are unit-load on-floor conveyors, the roller provides accumulation capability while the flat-belt will not; similarly, both power-and-totally free and trolley are unit-load overhead conveyors, with the power-and-free made to include a supplementary track in order to supply the accumulation capability lacking in 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, identifying, inducting, and separating items to be conveyed to specific destinations, and typically contains flat-belt, roller, and chute conveyor segments together with various moveable hands and/or pop-up tires and chains that deflect, push, or pull items to different destinations.[6]
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