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Process for making and detecting anti-counterfeit paper

  • US 6,045,656 A
  • Filed: 12/21/1998
  • Issued: 04/04/2000
  • Est. Priority Date: 12/21/1998
  • Status: Expired due to Fees
First Claim
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1. A method of producing a radiation light source detectable, anti-counterfeit paper, wherein said method is comprised of the steps of:

  • dissolving a soluble fluorescent dye in a solvent;

    dewatering wood fibers having lumens to a solids content of up to 50% solids;

    mixing said dissolved fluorescent dye with said dewatered wood fibers such that said fluorescent dye is loaded into said lumens of said fibers;

    cleaning said loaded wood fibers to substantially remove any excess fluorescent dye located on the outside of said wood fiber lumens;

    sealing said fluorescent dye substantially inside said lumens of said wood fibers;

    removing said fluorescent dye loaded wood fibers;

    drying said loaded wood fibers;

    incorporating said cleaned, lumen loaded wood fibers into a papermaking pulp furnish at a concentration of Z2 of said total furnish, where Z2 (ppm)=concentration of lumen loaded fibers in furnish= ##EQU3## where Z1 =amount of lumen loaded fibers in furnish in lbs/ton of fiber wherein said cleaned, lumen loaded wood fibers are incorporated into said furnish at a concentration of between at least one parts per billion up to 25%;

    forming said lumen loaded furnish into an anti-counterfeit paper; and

    wherein said fluorescent dye in said lumen loaded fibers can be detected by employing a radiation light source.

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