On Wed, 23 Sep 2009 08:26:09 -0700 (PDT), Art Unwin
wrote:


Thank you for confirming the use of eddy currents in the elevation and
projection of scrap materials.
My post states (not confirms) that eddy currents can be used but they
don't work in the manner you suggested. The eddy currents are not
solely responsible for the "elevation and projection" and there is no
"elevate with spin" either. There is certainly no confirmation that
the process is "dependent on the resistivity of the metal elevated" as
you suggest.

My understanding is that the special
purpose machinery industry has now advanced to the ability of sorting
plastic and the like.
Your understanding based upon what? Had you done a modicum of research
you would have a definitive answer about the mechanisms used in
sorting plastics and other non-metallic materials.

A little research beyond glossy brochures filled with marketing-speak
can go a long way in aiding your understanding. You might use a search
engine to locate manufacturers of sorting systems and query the
manufactures for technical details on how their various systems
operate. Your idle speculation based upon incomplete information
serves no purpose.
http://tinyurl.com/clxl9t