Characterization of retention and drainage aids

Optimized lab retention measurement allows fast and reliable conclusions for the process

Increasing productivity is a critical success factor for a paper mill. Productivity is strongly connected with how quickly water can be removed from the fiber suspension while retaining a maximum amount of fines and fillers. To pursue this goal papermakers rely on new technologies and chemical additives such as retention and drainage aids. Most of these are high-molecular, charged polymers which support flocculation and bonding of fines and fillers to the fiber. Retention and drainage aids need to be adjusted specifically to the paper machine onsite and the raw materials used. In order to select the right products, preliminary tests in the laboratory are indispensible by checking the effect of the selected single-, dual or multiple retention system. However, with former lab equipment such tests were very time-consuming, especially the retention measurement as it required the determination of consistency and ash of each filtrate. Things changed with the Mütek DFR-05.

Clariant Produkte (Deutschland) GmbH predominately uses the DFR-05 for R&D projects and for verification of their standard products such as bentonites for retention and drainage applications. Retention is a characterizing parameter for bentonites but could only be included in the acceptance test protocol once an economically reasonable measuring method was available. The time effort with conventional methods was out of question. An additional aspect for Clariant is to work out solutions for their customers onsite. Getting all retention results immediately after each measurement facilitates customer trial visits considerably.

  • R&D and paper mill applications
  • Time-saving of 30 minutes for each measurement compared to conventional methods
  • Short return of investment