Performance Evaluation of Chemi-mechanical Pulping Obtained from Five Kinds of Common Fast-growing Pulpwood in Hainan Province

Five species of fast-growing pulpwood (Eucalyptus urophylla×E. grandis, Eucalyptus urophylla, Eucalyptus urophylla×E. tereticornis, Acacia mangium, Acacia crassicarpa) in Hainan Province were collected and converted into pulping. Then, their pulping performance were evaluated by using P-RC APMP as the process. The experimental results showed that the pulp yield of E. urophlla×E. tereticornis was the highest, reaching 91.2%, whereas the yield of A. crassicarpa pulp was the lowest, reaching 84.2% under the same pulping process conditions. When the pulp was milled to the same Canadian Standard Freeness of 300 mL, the electricity consumption of A. mangium pulp was the lowest, 1 209 kW·h/t, while that of the E. urophylla×E. grandis was the highest, 1 361 kW·h/t. The E. urophylla×E. grandis pulp had the highest bulk of 2.84 cm³/g. The bulk of A. mangium pulp and E. urophlla×E. tereticornis pulp were lower at 2.45 and 2.51 cm³/g, respectively. The strength performance of A. mangium pulp was the best, and its tensile strength, burst strength and tear strength were 28.42 N·m/g, 1.54 kPa·m²/g, and 2.7 mN·m²/g, respectively. The strength properties of the E. urophylla×E. grandis pulp was the worst. The whiteness of E. urophlla×E. tereticornis pulp and E. urophylla pulp were the highest (about 83% (ISO)), and the whiteness of A. mangium pulp was the lowest (about 78% (ISO)).