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把亮果桉的心材和边材分离,分别测量了每种材的物理性质和化学性质。心材和边材的密度相似,但边材平均纤维长度比心材长12.6%,其纤维壁比心材的厚。在化学成分上最重要的差异是,心材木素比边材多15%,半纤维素多20%。把心材和边材的木片按一定比例混合进行硫酸盐法制浆,评价了黑液和纸浆的性能。研究发现,与纯边材浆相比,纯心材浆的抗张指数、耐破指数更高,而撕裂指数和松厚度较低。心材比例超过50%会带来更高的卡伯值,并使浆渣含量增加。
The heartwood and sapwood of Bright Eucalyptus were separated, and the physical and chemical properties of each material were measured. The density of heartwood and sapwood is similar, but the average length of sapwood is 12.6% longer than that of the heartwood, which is thicker than the heartwood. The most important difference in chemical composition is that heartwood lignin is 15% more than sapwood and 20% more hemicellulose. The heartwood and sapwood by a certain percentage of mixed wood pulp kraft method to evaluate the performance of black liquor and pulp. The study found that, compared with the pure-edge pulp, pure heart pulp tensile index, burst index higher, while the tear index and bulk is low. More than 50% of heartwood material will bring higher kappa number, and increase the content of pulp.