Importance

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Abstract

The present invention relates to a screen for accepting waste material, the waste material comprising fines and oversize material, wherein the screen comprises: a trough with a top opening, a base opening for discharging the fines material and an oversize material outlet for discharging the oversize material; driven elongate rotating members for causing movement of the waste material, wherein each rotating member comprises a shaft and a plurality of mutually parallel blades, wherein each blade independently has a plurality of radial protrusions which act on the material during the movement thereof, wherein for one or more blades on each shaft independently, at least one of the radial protrusions on the or each blade is an extended radial protrusion, wherein the material to be screened is introduced at one end of the shafts and expelled at the other end, characterised in that each elongate rotating member independently is held and rotatably mounted at both ends, wherein the driven elongate rotating members comprise a first plurality of driven elongate rotating members disposed in a first arc along one side and along at least a portion of the base of the trough for causing circular or helical flow of the waste material and a second plurality of driven elongate rotating members disposed in a second arc along the other side of the trough and along at least a portion of the base of the trough for causing circular or helical flow of the waste material, wherein, for each plurality of driven elongate rotating members, at least one elongate rotating member runs at a different speed to the other elongate rotating members, and wherein the speed of the elongate rotating members does not decrease towards the top opening of the trough.

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First Claim