a system for separating pieces of plastic bag from ground yard debris and the like , e . g ., asphalt shingles . a conveyor conveys the debris material along a conveyor path and an agitator bounces the conveyor to cause the lighter plastic to reposition to the top of the material on the conveyor . a suction tube end is positioned over the debris material following agitation to draw the plastic off the top of the material . the tube end is selectively adjustable to enable discriminate suction effect to draw off a maximum amount of plastic and a minimal amount of nonplastic recyclable debris .