| Abstract:Using two pulps from two mills, the handsheets were prepared with adding filler in two ways, one was to simulate the current production operation, another was to use pre-flocculation technique, and the filler was pre-flocculated with wet end chemicals. The relation between fines content and ash content, paper strength of the handsheets prepared by different loading processes was studied. The results indicated that when filler was added by using pre-flocculation technique, the ash content increased from 10.8% and 9.0% to 12.2% and 10.3%, tensile strength increased from 21.6 N·m/g and 23.4 N·m/g to 22.2 N·m/g and 27.6 N·m/g of the handsheets prepared by using two different mill’s pulps respectively. The surface morphology of the handsheets was analyzed by SEM; it was found that most of the pre-floccalated fillers were resented in the pores of fiber network, on the contrary, the fillers mainly resented on the fibers surface when fillers were added according to conventional process. |
