Drainage Freeness Retention
Lab simulation of drainage, freeness and retention processes onsite
The Mütek™ DFR-05 Drainage Freeness Retention simulates the retention and drainage conditions prevailing in a paper machine immediately before and during sheet forming. Chemical addition is fully automatic via a dosing module. The optionally available RET-20 Lab Sensor directly measures the filtrate consistency, making a manual determination of stock and ash consistencies superfluous. The drainage behavior is characterized by gravimetry of the filtrate volume.
The Mütek™ DFR-05 is designed for use with a PC and application software. The RET-20 Lab sensor is optional. The instrument is intended for indoor use at temperatures in the range of 15 °C to 40 °C (59 °F – 104 °F). It is rated for voltages of 100 – 240 VAC at 50 Hz / 60 Hz.
The DFR is also available as a special freeness version, the Mütek DFR-05 Freeness.
Retention and drainage Stock samples in the consistency range of 0.2 % to 2 %. A sample volume of 1 liter is required per measurement. Since the sample temperature strongly impacts the test results, the temperature should be kept constant.
Freeness Freeness measurement is performed in line with DIN EN ISO 5267-1 2000 which specifies that the sample is to be diluted to 0.2 % consistency using distilled water. Temperature should be adjusted to 20 °C. A sample volume of 1 liter is required per measurement.