A system for the recovery of paper-making fiber from contaminated waste paper products including plastic film and other lightweight non-paper contaminants includes a novel rotary screening machine comprising a perforated drum rotatable about a generally horizontal axis and having openings at opposite...http://www.google.es/patents/US4538767?utm_source=gb-gplus-sharePatente US4538767 - Apparatus for recovering paper-making fiber from contaminated waste paper products
Apparatus for recovering paper-making fiber from contaminated waste paper ...
