Process plastic separation
The plastic pieces that need to be separated are continuously fed into the stirring tank where the whole surface of each piece is coated with the liquid while any adherent air bubbles are removed from the surface at the same time. This process leads to a homogenous distribution of the plastic pieces in the separation liquid.
Afterwards, the liquid-plastic-mixture is fed into the separation tank generating a laminar stream over a certain time period and therefore enabling the different plastic pieces, without being disturbed by any turbulences, to orientate themselves upwards or downwards. The result is, that all pieces having a higher density than the liquid are going to start sinking, all pieces with a lower density are going to start floating.
The part of the liquid volume containing the heavy pieces is drawn off the bottom tank outlet, the remaining liquid volume flows over the upper tank outlet together with the lighter pieces.
In both streams the liquid and the plastic pieces are separated with sieves and dry centrifuges. After that, the whole liquid volume is transfered back into the stirring tank. Dissolved impurities as well as unwanted fines can be screened within the continuous cycle of the liquid.