STUDY ON THE RHEOLOGICAL PROPERTIES OF FAST-GROWING EUCALYPTUS

Abstract

To study the effect of retention and drainage aidson the fast-growing eucalyptus bleached kraft pulp (EBKP) suspensions, different concentrations of cationic polyacrylamide (CPAM)and cationic starch were dosed with EBKP suspensions and their effects on rheological properties were studied. Theshear yield stress (τy)of softwoodbleached kraft pulp(SBKP)and poplar alkaline peroxide mechanical pulp (PAPMP) were comparedandevaluated for their potential applications. The results show that in the steady-state shear condition, the τyof EBKP is proportional to the pulp mass concentration (Cm),corresponding to the exponential relation . SBKP had the highest τyvalues, followed by EBKP and PAPMP. Adding CPAM and cationic starch to EBKP suspensions at low to moderate doses increased the τy, butonce thelevels reached a certain point, the τyvalues began to deteriorate. This research is crucial to achieve optimally and stabilize the downstream manufacturing process in papermaking.