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Material separation

Applications

branch.
When separating plastics, e.g. PET and PVC, the plastic must first be completely disintegrated, there cannot be any material composites present. This is normally achieved through shredding the plastics into pieces of sizes between 2–12 mm.
During separation the pieces are first charged, e.g. through friction. PET and PVC have different permittivity (turboelectric properties). If two materials with different permittivity rub against each other, one is then positively charged and the other negatively. In our example the PET is charged positive and the PVC negative.
Finally, the charge is applied to the pieces through an electric field. The positively charged pieces are pulled in by the negative electrode. The negatively charged pieces are pushed away by the negative electrode.

Free fall separator for minerals

Some material separator variants are free fall cutters in which the material in free fall is dumped through the cutter. This finds application, for example, when separating minerals such as NaCl / KCI.

Free fall separator for minerals

Roller separator

Other variants are roller cutters for conductors/​non-​conductors

Roller separator