3.2. Durian rinds pulp properties
In this research, within the 1980 g weight of durian rinds, 90.175 % or 1785 g of oven dry weight starting
material used for pulp preparation. 5070 g of air dry (a.d) durian rinds pulp was produced after refining mechanical
pulping (RMP) and screening process. Moisture content result of the durian rinds pulp was 82%. So, there are only
18% or 912.6 g of moisture free content inside the durian rinds pulp. It was calculated that the durian pulp screened
yield is about 51.11 %. The yield percentage of screened durian rind pulp by chemi-mechanical pulping process is
quite lower compared to common yield of chemi-mechanical pulping process is about 55 % - 85 %. Unbeaten CMP
durian rinds pulp recorded the Kappa number of 100 which is very high lignin content. This number shows how
much lignin content in durian rinds pulp for papermaking. This value can be reduced by bleaching process or
chemical pulping process. Corrected freeness value shows that CMP durian rinds pulp only can achieved freeness
value of 89. Table 3 shows the durian rinds CMP pulp shows high value of drainage time. It shows that durian rinds
pulp holds the water content that absorbed inside the pulp.