Aluminium is automatically separated from the mix of plastic and aluminum with a device that gives off a kind of magnetic field called an eddy current. As items reach the end of a conveyor belt, aluminum items are moved by the gravitational field a bit farther than plastic ones and fall into a separate bin. Tin, too, is separated automatically by using a magnet earlier in the process.
January 24, 2011 4:00 AM PST
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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