In the Polymer Recovery Systems Float/Sink Tank, material is deposited on to the surface of the water in the tank. Heavy material sinks to the sloped bottom of the tank. An auger or drag conveyor, which continually sweeps the bottom surface conveys this material to an above-water discharge. Buoyant material is conveyed to the opposite end of the tank where it is discharged by a partially submerged screw conveyor or a rotating paddle.
The process material is propelled in a gentle Z-shaped flow pattern on the surface of the water solution traveling approximately 25 ft. This allows longer material residence times and superior separation in a compact unit. The flowing material is gently submerged and propelled by a series of auger flight segments and paddles to completely wet and de-aerate the plastic flake.