Standard bins and shelves are generally fabricated of wire. Wire is less expensive than sheet matal, lighter in weight, and dust-free. Where heavier weights are imvolved, standard wire bins may be strengthened too by using solid sheet- metal supporting bin backs. The solid backs give bin rigidity, prevent small items from failing through, reduce vertigi effect, and most importantly, support the major portion of the weight of each individual shelf. Shelf load is, therefore, distributed down through the back and through both wire sides.Figure: Twin Bin
Bin widths and depths vary, as do bin heights allowing great flexibility in carousel system design. Special configurations are quite common.
A major innovation is the twin bin which allows the operator to puck from the left and the right sides of two different bins, rather than just the front of a single bin. This doubles the volume available for picking at a single bin stop, resulting in improved throughput.
