Application of the Novel Test Machine, Retention and Drainage Analyzer (RDA), for Wet-end Analysis of Papermaking Process (II) : Vibratory RDA and Selection of CaCO3 Filler by Simultaneous Considering of Multiple Assessment Factors

Abstract

Wet-end where the fibrous components and functional additives are applied is an essential part for determination of properties of the final product and runnability of papermaking process. However, it is difficult to anticipate physical and chemical phenomena in wet-end using some instruments for lab-scale papermaking test. In addition the performance of retention aids and fillers have to be evaluated by overall analysis of retention, drainage, and paper uniformity. With regard to renovate retention and drainage analyzer (RDA), a new analysis of retention, drainage, and paper uniformity using the RDA had been studied. In this study the RDA was modified by equipping air piston vibrator which could delay the consolidation of wet web and reduce the retention of fines. Effects of the varied kinds of fillers on wet-end of fine paper were analyzed by summation of drainage, turbidity (retention), and paper uniformity using the modified RDA. As a consequence, the selection of proper filler for the optimization of wet-end of paper making process for fine paper was made by using the modified RDA.