FREENESS AND SCANNING ELECTRON MICROGRAPHS OF MECHANICALLY-TREATED ORGANOSOLV-PULPED ACACIA HYBRID
L. Kang Chiang*, Phiong Siaw Kian and Eunice Chong Wan Ni
AbstractFREENESS AND SCANNING ELECTRON MICROGRAPHS OF MECHANICALLY-TREATED ORGANOSOLV-PULPED ACACIA HYBRID
- Kang Chiang*, Phiong Siaw Kian and Eunice Chong Wan Ni
School of International Tropical Forestry, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia.
This paper examines the pulp freeness at different refining degrees on organosolv pulps and their visual appearance through scanning electron microscopy. Organosolv pulping of 50%, 60% and 70% concentrations of ethanol were used to cook Acacia hybrid wood chips in temperature controlled batch digester for 2.5 hours at 185 °C. The ratio of liquor to wood for organosolv pulping was 10:1. During refining process, PFI Mill was used to fibrillate the pulp fibres. Freeness was determined using Canadian Standard Freeness (CSF) tester. From this study, pulp freeness decreases as PFI revolution increases. As action of refining was done on the pulp, fibrillation occurred on pulp fibre wall. Refining caused the pulp fibres to have more surface area which increases fibre-to-fibre bonding. Acacia hybrid pulp from 70% ethanol concentration was easier to be refined in PFI Mill as compared to pulps from 50% and 60% ethanol concentration. Micrographs of these fibrillated pulp fibres at different refining degree from different ethanol concentrations were presented in this study.