Mix Plastic

What is left after removal of hazardous material such as refrigerant, motor, compressor, cables, is size reduced  by a multiple shaft shredder .

The plastic fraction is a mixture of different polymers, mostly PS  PP .

Some form of air classifier or dust blower are used to remove the urethane foam and other dirt post-shredding.

Cleaning by washing can be done followed by density separation in a sink float tank to separate  PP from PS achieving a good level of purity.