To know the sizing of the screens it is necessary to consider several factors such as feed rate, material moisture, abrasiveness, type of classification, rock type, crusher inlet size, processing speed and also, particle size. The most important point is that screens cannot receive a higher feed rate than they are designed for. Technically the limiting factor for a screen is the height of the layer of material on the decks but this varies according to the application and also the screening media aperture size. For example, an 8x20 inch screen can operate with a capacity of 100 tonnes per hour for a 2mm aperture, and 1000 tonnes per hour for a 100mm aperture screen with the same layer heights.
The quality of material separation is totally linked to the productivity of the screens. And this more broadly corresponds to choosing the right crusher, positioning the screens and levelling the equipment. The material to be screened must be evenly distributed, so the adjustment and tension of the screens are fundamental factors.