5. Operating at Too Much Capacity – Often merely lowering the operating capacity slightly will greatly improve the separation. Care should be taken not to decrease capacity too much. The machine’s deck should be completely covered. Capacity is usually dependent on the standards to be met and the quality of material being fed onto the gravity. Quality and capacity are inversely related. That is, increasing capacity usually lowers quality and decreasing capacity usually improves quality.
6. Improper Dust Hood Arrangement – Dust Hoods reduce dust and dirt emissions into the plant and also reduce noise levels in the plant. The dust hood and exhaust system must be designed to exhaust at least 5% more air than the machine uses for separation. Also, adequate make-up air must be available. Dust Hoods and the associated air exhaust system design require export knowledge to provide an economical and efficient system. If your machine is equipped with a dust hood and you feel that you are not getting proper separations we suggest you contact the factory.