稻草氧碱浆打浆特性的研究

摘要

为研究稻草氧碱浆的打浆特性,采用PFI磨考察了不同打浆度对稻草氧碱浆滤水性能、纤维形态的影响,并分析其纸张强度性能的变化.结果表明:纸浆打浆度与保水值在打浆初期快速上升,在打浆后期上升趋缓,但是打浆度在打浆初期能快速上升至55~60°SR,而保水值快速上升阶段仅到45°SR左右;同时杂细胞的存在对滤水性能不利.打浆度35~75°SR过程中,纤维长度的变化不大,未除杂浆纤维长度下降最多约为7.3%,除杂浆纤维长度下降最多约为4.0%,而打浆对纤维表面的细纤维化作用明显.未除杂浆纸张耐破指数和抗张指数在打浆度65°SR时达到最佳,杂细胞的存在会对纸张的抗张强度提高形成一定的阻碍,除杂浆纸张耐破指数和抗张指数在65°SR以上的高打浆度下仍然保持上升的趋势,因而更倾向于在高打浆度、高结合强度要求的纸种当中获得应用.%The effects of different beating levels on drainability and fiber morphologies of rice straw alkali-oxygen pulps were investigated by PFI mill, and the strength performances of hand-sheets prepared by this pulp were also analyzed.The results showed that the changes of the beating degree and water-retention value were similar in the initial stage and later stage of beating.In the initial stage, the beating degree was rapidly increased to 55-60°SR.Meanwhile, the water-retention value was increased to about 45°SR.When the beating degree was increased to 75°SR from 35°SR, the fiber length changed little with the maximum decrease rate of the pulp without non-fibrous cells (Pnof) of 7.3% and that of the pulp with non-fibrous cells (Pf) of 4%, and more fibrillated fibers were observed during the beating process.The non-fibrous cells played negative roles on both the improvement of pulp drainabilityand the strength properties.The best burst index and tensile index were obtained as the beating degree was 65°SR.In addition, an ever-increasing tendency was found in terms of burst index and tensile index of paper sheets of Pnof with higher beating degree(above 65°SR).