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At the 26th Annual Aerospace/Airline Plating and Metal Finishing Forum last year in Tulsa, SAE Technical Paper Series #900970, NEW TECHNOLOGY NOW -- DENSE PARTICLE SEPARATOR FOR DRY PAINT STRIPPING, was included as a handout in the technical paper package. Some early evaluations of plastic media resulted in adverse test data conclusions due to contaminated media and uncontrolled blast parameters. Tests rerun with clean media confirmed the existence of acceptable test data. Existing equipment was not adequate for separation of dense non-magnetic particles like sand. Thus, PAULI & GRIFFIN COMPANY developed a high-volume dense particle separator. Test data showed that the Dense Particle Separator (DPS) was capable of removing 90% of the heavy particles from any used 1.5 specific gravity media and 98% from any 1.2 specific gravity media.

Some early evaluations of plastic media resulted in adverse test data conclusions. These conclusions ranged from excess surface roughness and metal loss to decreased fatigue life and on to damage of composite surfaces. Fortunately, contaminated media and uncontrolled blast parameters were later recognized as being the basic cause of negative test results. Tests were rerun to confirm the existence of acceptable test data provided clean media was utilized. Efforts were directed towards assuring the user that recycled media had been efficiently cleaned. Existing equipment was not adequate for the separation of dense non-magnetic particles like sand. In this paper, we outline our development of a high volume dense particle separator. Use of this equipment will enable the operator to be assured of using only clean media.