Fines of Acacia mangium recycled kraft paper
2005
Rushdan Ibrahim
The effects of initial refining degree (32, 56 and 70o SR) on the quantity and quality of fines of Acacia mangiurn unbleached kraft recycled papers were studied. The retention of fines and the effect of these fines on the bonding index of handsheets were also studied. The fines' content and retention were determined using the Dynamic Drainage Jar. The fines size and zeta potential were analysed by the COULTER@ DELSA 440. Fines were reduced from pulp stocks at different levels by Dynamic Drainage and these stockswere then converted into handsheets. The fines were found to vary in quantity (3.0 to 8.5Vo) and, quality (average size of 1.5 to 2.2 pm and average zeta potential of -30.6 to -44.3 mV) for different initial refining degrees. The amounts at which the recycledfines were retained in the stock also varied (91.4 to 48.3Vo) for different recycled pulps and this depended on the initial refining degree and the drainage shear. The bonding index of recycled papers was found to decrease with reduction in fines content (25 to 34Vo).
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