造纸与纤维材料

系统分析了杨木、法桐和桦木三种阔叶木枝桠材的化学成分、纤维形态，并对比三种原料的P-RC APMP工艺适配性。结果表明：在化学组分方面，法桐综纤维素含量最高，木质素含量最低；在纤维形态方面，相较于杨木，法桐和桦木原料纤维均具有更大的纤维长度、宽度和长宽比，平均扭结指数更低；在浆张性能方面，法桐浆张松厚度(3.04 cm³/g)和抗张指数(23.34 N·m/g)较高，桦木浆张撕裂指数(8.15 mN·m²/g)最高，杨木浆张白度(75.05%)最高。总体上，法桐在松厚度和抗张指数方面优势显著，桦木撕裂指数最突出，杨木白度表现最佳，三种原料优势各异，制浆企业可根据产品定位合理选择。本研究为拓宽制浆原料来源、推动高得率浆差异化生产提供参考。

The chemical composition and fiber morphology of three hardwood branchwood materials,poplar, London plane and birch, were systematically analyzed, and their respectivesuitability for the P-RC APMP(pre-conditioning refiner chemical alkaline peroxide mechanical pulp) process was compared. The results showed that in terms of chemical composition, London plane had the highest holocellulose content and the lowest lignin content. Regarding fiber morphology, compared with poplar, both London plane and birch pulp fibers exhibited higher fiber length, width, and aspect ratio, as well as a lower average kink index. In terms of pulp sheet properties, London plane showed relatively high bulk(3.04 cm³/g) and tensile index(23.34 N·m/g), birch exhibited the highest tear index(8.15 mN·m²/g), and poplar had the highest brightness(75.05%). Overall, London plane exhibited remarkable advantages in bulk and tensile index, birch achieved the highest tear index, and poplar showed the optimal brightness. The three raw materials possessed distinct superior properties, and pulp mills can make reasonable choices according to product positioning. This study provides a positive reference for broadening the sources of pulping raw materials and promoting the differentiated production of high-yield pulp.