The use of focused beam reflectance measurement in the development of a new nanosize particle

The present study examines the utility of flee size analysis via Focused Be am Reflectance Measurement (FBRM) as a means to measure retention program p erformance. A series of laboratory tests were done using both a Dynamic Dra inage Jar (DDJ) and the FBRM. Total Fines Retention (TFR) was measured via DDJ. The change in mean chord length (Delta MCL) was measured via FBRM. It was found that TFR and Delta MCL are linearly correlated. Further, the rela tive performance measured by DDJ is equivalent to that measured by FBRM. A pilot paper machine study is also presented during which the FBRM was incor porated into the headbox furnish feed loop. The data presented confirms tha t FBRM can be used to monitor the retention program during paper production and yield valuable machine operational information. Indeed, the relative o rder of performance observed in the laboratory was confirmed on the paper m achine. As in the laboratory studies, FPR and First Pass Ash Retention (FPA R) were found to correlate with the FBRM results.