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Method for the identification of plastics

  • US 5,329,127 A
  • Filed: 04/12/1993
  • Issued: 07/12/1994
  • Est. Priority Date: 04/23/1992
  • Status: Expired due to Fees
First Claim
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1. A method of identifying different plastics comprising the following steps:

  • a) providing each plastic with a plurality of fluorescent marker materials wherein said plurality of fluorescent marker materials contains at least one marker material that has a duration of fluorescence which differs from the duration of fluorescence of the other marker materials and further wherein each plastic is provided with a different combination of said fluorescent marker materials;

    b) exposing the plastics to a source of radiation which will cause the marker materials to fluoresce;

    c) measuring the fluorescence patterns of the plastics after exposure to the radiation in step b); and

    d) identifying each plastic by the different durations of fluorescence exhibited in the fluorescence patterns measured in step c).

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