Abstract Effect of different proportions of bark in mixed hardwood (about 70 % eucalyptus and 30 % poplar) chips on pulp and papermaking properties was studied. Increased proportion of bark in raw material chips resulted in increased active alkali consumption, increased reject content in pulp and reduced pulp yield after kraft pulping. The unbleached pulp obtained with higher proportion of bark in mixed hardwood chips also has higher kappa number, lower brightness and viscosity as compared to pulp obtained with bark free mixed hardwood chips. The soda loss and ash content in pulp were severely increased from 12.8 kg/t to 312 kg/t of pulp and 0.7 % to 21.1 %, respectively with the increase of bark portion from 0 to 100 % in raw material furnish. The physical strength properties like tensile, burst and tear indices in the pulp obtained from bark were reduced by 58.5 %, 60.7 % and 68.4 %, respectively as compared to that with bark free mixed hardwood.

中文翻译：

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混合阔叶木片中树皮含量对制浆和造纸性能的影响

摘要 研究了混合硬木（约70%桉树和30%杨树）木片中不同比例的树皮对制浆和造纸性能的影响。原料木片中树皮比例增加导致活性碱消耗增加，纸浆中废渣含量增加，牛皮纸制浆后纸浆得率降低。与用不含树皮的混合阔叶木碎片获得的纸浆相比，在混合阔叶木碎片中用较高比例的树皮获得的未漂白纸浆还具有更高的卡伯值、更低的亮度和粘度。随着原料配料中树皮部分从 0% 增加到 100%，纸浆中的苏打损失和灰分含量分别从 12.8 kg/t 严重增加到 312 kg/t 纸浆和 0.7% 到 21.1%。物理强度特性，如拉伸、