柠条全杆碱预处理双螺杆APMP制浆特性的研究

Study on Twin-Screw Alkaline Peroxide Mechanical Pulping of Whole Stalk of Caragana korshinskii with Alkali Pretreatment

关键词:  柠条  双螺杆APMP  碱预处理  H₂O₂漂白  纤维形态

Key Words:Caragana korshinskii  twin-screw APMP  alkali pretreatment  H₂O₂ bleaching  fiber morphology

摘要:对柠条（Caragana korshinskii）全杆进行了碱预处理双螺杆APMP制浆条件的实验室小试和工厂中试，并探讨了柠条碱预处理双螺杆APMP浆料纤维形态特征和浆料物理性能。小试结果表明，柠条经过NaOH在90℃下预处理后，再用双螺杆进行APMP法制浆所得浆料的抗张指数、白度、环压强度和纸浆得率均高于柠条CMP浆。中试研究进一步表明，柠条碱预处理双螺杆APMP浆经两段H₂O₂（每段2%H₂O₂）漂白后，浆料白度达到70.1%。实验室小试的柠条双螺杆APMP浆的纤维长度总体偏短，质均长度为0.655 mm。而工厂中试的双螺杆APMP浆的纤维质均长度提高到0.803 mm，说明大直径双螺杆能减少对纤维的切断。

Abstract:The laboratory experiment and pilot test of twin-screw APMP pulping with alkali preteatment of whole stalk of Caragana korshinskii were carried out.The morphological characteristics of the twin-screw APMP pulp and the physical properties of the paper were investigated. The experimental results showed that after pretreatment of Caragana korshinskii by NaOH at 90℃, the paper obtained had higher tensile index, brigtness, ring crush strength and pulp yield than those of CMP of Caragana korshinskii. The pilot test further showed that the brigtness of twin-screw APMP pulp from Caragana korshinskii reached 70.1% after two stages of H₂O₂ bleaching(2% H₂O₂ per stage). The fiber length of the Caragana korshinskii twin-screw APMP pulp in the laboratory test was generally short, and the weight average length was 0.655 mm. The weight average fiber length of the pilot test twin-screw APMP pulp increased to 0.803 mm, indicating that the large-diameter twin-screw could reduce fiber cutting.