METHOD OF, AND APPARATUS FOR, SEPARATING OUT MATERIALS HEAVIER THAN PLASTIC, IN PARTICULAR METALS, BY FLOTATION IN A WATER BATH, IN A SEPARATION OF PLASTICS OF DIFFERENT DENSITIES

摘要

A process and device for separation of plastic material from other stuff of a various density by a flotation process in a liquid bath. The process involves discharging heavier stuff that settles on the screen bottom by a movable screen bottom slowly moves in the direction of reducing a slot that exists between one edge of screen bottom and the wall of the flotation tank and then after having reached a final position too quickly and abruptly move in the counter-direction. That movement occurs in intervals. This abrupt motion of screen bottom initiates that kinetic energy accumulated in the heaps of metal and other heavy stuff moves this stuff towards the slot-edge and through the slot into a collection-container underneath the screen bottom to be discharged.