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Control technique for multistep washing process using a plurality of chemicals

  • US 9,676,011 B2
  • Filed: 08/29/2011
  • Issued: 06/13/2017
  • Est. Priority Date: 08/29/2011
  • Status: Active Grant
First Claim
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1. A method for optimizing a multistep washing process using a plurality of chemicals, the method comprising the following steps for at least one chemical:

  • conveying a chemical through a feed channel from a chemical container to a washing object and from the washing object through a return channel back to the chemical container;

    monitoring, during conveyance of said chemical, a first parameter set in the feed channel and monitoring a second parameter set in the return channel, wherein each parameter set includes at least one parameter indicating directly or indirectly the purity of the chemical;

    determining the mutual uniformity of the first and the second monitored parameter sets when the first parameter set and the second parameter set are similar within a predetermined threshold value; and

    determining an action time of the chemical on the basis of the mutual uniformity of the first and the second parameter sets.

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