Reducing the content of heavy metals in recovered plastics
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United States of America Patent
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Nov 6, 2012
Grant Date -
Apr 21, 2011
app pub date -
Oct 15, 2010
filing date -
Oct 16, 2009
priority date (Note) -
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Abstract
A method for reducing the content of a heavy metal in a mixture of solid plastic materials, wherein the mixture includes plastic flakes and there are at least two different colors of plastic flakes in the mixture. A percentage of each of two or more colors of flakes in the mixture is determined. A heavy metal content in the mixture based on the determined percentages is predicted. Whether the predicted content of the heavy metal in the mixture exceeds a pre-determined threshold is determined. If the predicted content exceeds the pre-determined threshold, a color sorting step is performed to obtain a subset of the mixture of plastic flakes, wherein the subset of the mixture of plastic flakes has a lower heavy metal content than the mixture prior to the color sorting step.
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