Supercritical fluid cleaning of banknotes and security documents

Supercritical fluid cleaning of banknotes and security documents

  • CN 104,918,720 B
  • Filed: 09/09/2013
  • Issued: 09/11/2020
  • Est. Priority Date: 11/01/2012
  • Status: Active Grant
First Claim
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1. A method of cleaning a plurality of banknotes, each banknote comprising a substrate, visual data and a security feature, the method comprising:

  • exposing each banknote comprising a substrate, visual data and security features to a supercritical fluid at a temperature and pressure and for a time sufficient to clean the substrate and not damage the security features and visual data in a chamber containing the supercritical fluid, wherein a plurality of banknotes are held in the chamber by a plurality of structures, each structure causing the supercritical fluid to flow through the banknote and cycle around it;

    wherein cleaning the substrate comprises removing one or more species from the substrate to the supercritical fluid.

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