Magnetic separation used for plastic resin recovery

Sequential 3D blow molding, co-injection, two-shot injection, co-extrusion and overmolding processes can all produce mixed resin scrap. This scrap is often made up of dissimilar resins or colours that need to be separated for maximum recovery efficiency and cost savings. One challenge multi-material processors face is segregating and recovering dissimilar resins. Salvage labour is expensive and inconsistent, and cutting, peeling and sawing multi-material molded parts creates ergonomic risks to employees..

Eriez’ PolyMag Process utilizes the high intensity magnetic separation to reclaim valuable plastic resins. PolyMag Separators use extremely powerful Erium Rare Earth Permanent Magnets and a tiny amount of PolyMag additive to separate mixed resin regrind particles.

With the PolyMag Process, the first step is to dose less than one percent of the PolyMag Additive into one of the co-molded resins with an additive feeder or colour auger. Then to recover the scrap that occurs from start-up, process variations or design changes, users simply granulate the multi-material moldings using a standard plastics granulator. The regrind material is then ready to be run through the PolyMag Separator. As long as the multi-material part can be ground, PolyMag can help separate it. The end result is a high percentage of resin separation, in less time and with greater safety.