12 while the revolving outer surfaces 18 are rotating toward stationary semi cylindrical surface 16 as will be understood from the prior art the rotation of cleaning cylinder 12 carries the tufts past a stripping bar 27 and plurality of cleaning grid bars 23 disposed to separate a major portion of foreign matter from the cleaning cylinder 12 which foreign matter may be disposed via a trash conveyor system for subsequent collection and baling in the embodiment depicted foreign matter is disposed via a waste airflow w as will also appreciated a rotating doffing cylinder or brush 24 removes the cleaned tufts from the teeth 13 of cleaning cylinder 12 and delivers the cleaned fibers to duct 26 in the embodiment depicted the cleaned tufts may be entrained in a doffing air flow d which passes adjacent doffing brush 24 and into duct 26 the apparatus may be used to process cotton fiber according to the following description spaced apart individual tufts of fiber are conveyed in a high speed conveying air stream c to minimize agglomeration of the tufts first exposing the air stream to revolving separator 17 which is porous to radially inward and outward air flow and revolving at speeds developing centrifugal forces that cause the fiber tufts and foreign matter rotationally moving with.