Stationary Inclined Screens are set at 20 to 50 degrees to the horizontal. The grizzly is used mainly for dry screening but can also be used with slurry. It consist of heavy parallel bar or chains which may be shaken or vibrated to assist with classification and to minimize blinding problems. The apertures are parallel to the flow and may taper along their length.
Sieve bend also known as a DMS screen is a series of wedge bar arranged perpendicular to the flow. The surface is usually curved but can be made up of a number of straight section to simulate a curve. The flow to be screened is fed through a low pressure nozzle which distributes the flow tangentially over the full screen width by means of an adjustable slice that optimizes feed velocity.
As the suspension flows along the screen plate, thin layers of water are ”sliced off” by the screen bars and pass through the slots together with fine particles.