| 摘要 |
A material sorting apparatus comprises a perforated screen (3), for example a drum, adapted to be moved around an endless track. Means are provided for sucking air through the screen (3) inwardly of the track in a predetermined area (7) thereof. A material to be sorted is supplied to the apparatus such that it falls under gravity in close proximity to said predetermined area (7) of the track in order that laminar material is selectively sucked towards the surface of the screen (3). This material is transported in contact with the screen (3) while the screen is moving through and out of the predetermined area (7) but is released from the suction forces when the screen (3) moves out of said predetermined area (7). A first collection region is located beneath a region (8) of the apparatus adjacent the predetermined region (7) of the track into which material not transported by the screen (3) can fall. A second collection region (13) is located adjacent an area of the track other than said predetermined area (7) to receive material which has been transported in contact with the screen (3) out of the predetermined area (7) of the track.
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