Method for wet-treating, in particular cleaning, objects

Abstract

When treatment liquid is re-used for washing objects, first of all there has to be a test as to whether the concentration of the at least one treatment additive in the used treatment liquid is sufficient. Up to now all the treatment liquid to be re-used has been measured for this purpose. If it is necessary for the measuring to filter solids, which influence the measuring, out of the treatment liquid beforehand, all the treatment liquid to be re-used has to be filtered. This requires a correspondingly efficient filter. The invention provides for branching off a small amount from the treatment liquid to be re-used as a sample and only measuring said sample with regard to the concentration of at least one treatment additive still present in the used treatment liquid. Only a small part of the treatment liquid to be re-used serving as a sample has then to be filtered prior to the measuring process. Only a relatively small filter is necessary for this purpose. The measuring of the sample which only has a small amount of treatment liquid is able to be effected in a simpler and more reliable manner.

1 . A method for wet-treating objects using a washing device, wherein the objects are treated with a treatment liquid having at least one treatment additive and the treatment liquid is measured, wherein a sample is branched off from the treatment liquid and only said sample is measured. 
     
     
         2 . The method as claimed in  claim 1 , wherein the sample is filtered prior to the measuring. 
     
     
         3 . The method as claimed in  claim 1 , wherein the sample is branched off from the treatment liquid after the treatment liquid is used to treat the objects and prior to re-use of the used treatment liquid. 
     
     
         4 . The method as claimed in  claim 3 , wherein the sample is taken from the treatment liquid to be re-used once said treatment liquid has been returned into the washing device and/or into a preparation tank for the provision of the treatment liquid to be re-used. 
     
     
         5 . The method as claimed in  claim 1 , wherein during the operation of the washing device, the sample is branched off from the treatment liquid used and to be re-used, the sample is filtered, and then the sample is measured. 
     
     
         6 . The method as claimed in  claim 5 , wherein constituents of the treatment liquid to be re-used filtered out from the sample of the treatment liquid to be re-used prior to the measuring, are re-supplied to the treatment liquid to be re-used, prior to and/or in the washing device. 
     
     
         7 . The method as claimed in  claim 1 , wherein the remaining proportion of the at least one treatment additive in the treatment liquid to be re-used is determined and if a minimum proportion of the at least one treatment additive in the treatment liquid is undershot, a targeted additional metering of the relevant treatment additive is effected. 
     
     
         8 . The method as claimed in  claim 7 , wherein after the additional metering or after each additional metering of the treatment liquid to be re-used, once again a sample is taken, the sample is filtered, and then the sample is measured. 
     
     
         9 . The method as claimed in  claim 1 , wherein a proportion of the active cleaning substances, disinfecting substances and/or active bleaching substances still present in the treatment liquid after the treatment liquid is used to treat the objects is determined by measuring the previously filtered sample. 
     
     
         10 . The method as claimed in  claim 1 , wherein the sample is drawn off after the measuring process. 
     
     
         11 . The method as claimed in  claim 1 , wherein in the case of a washing device that is a continuous-batch washing machine, the used treatment liquid is re-used for a pre-wash and/or a final wash. 
     
     
         12 . The method as claimed in  claim 11 , wherein the used treatment liquid is re-used for the pre-wash, the final wash and/or for rinsing. 
     
     
         13 . The method as claimed in  claim 2 , wherein the sample is filtered by micro filtration. 
     
     
         14 . The method as claimed in  claim 10 , wherein the sample is drawn off after the measuring process into a drain. 
     
     
         15 . A method for wet-treating objects preferably using a washing device, comprising the steps of:
 treating the objects with a treatment liquid having at least one treatment additive;   branching a sample off from the treatment liquid; and   measuring only the sample in regard to the concentration of the at least one treatment additive in the sample, wherein the concentration of the at least one treatment additive in the sample is used to indicate the concentration of the at least one treatment additive still present in the treatment liquid used.