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| 首页 >> 中国造纸杂志社 >> 中国造纸学报 >> 摘要 >> 《中国造纸学报》2019年第03期中英文摘要 |
| 表面活性剂改善黏胶级竹溶解浆的反应性能 |
| 陈秋艳,马晓娟,黄六莲*,曹石林,苗庆显 |
| 《中国造纸学报》编辑部 2019,34(3):1-5 |
| 多羧基纤维素纳米晶的制备与性能研究 |
| 张燕洁,黄 进,马小舟* |
| 《中国造纸学报》编辑部 2019,34(3):6-12 |
| Mg（OH）2粒径对辐射松氧脱木素的影响 |
| 宁登文,成雅楠,符昌铭,陈 柳,黄 海,曹石林,黄 方*,倪永浩 |
| 《中国造纸学报》编辑部 2019,34(3):13-17 |
| 木质素基超疏水涂层的制备与表征 |
| 张雨晴,王玺傲,王 兴,李 尧,周景辉* |
| 《中国造纸学报》编辑部 2019,34(3):18-23 |
| 基于碱脲溶剂体系胶化作用的湿强纸的制备 |
| 翟 睿,王慧丽,胡志军,张学金,赵会芳,周小凡 |
| 《中国造纸学报》编辑部 2019,34(3):24-30 |
| 磷酸活化法脱墨污泥活性炭的改性研究 |
| 万月亮,孟祥美,冯 琨,孔话峥,刘廷志* |
| 《中国造纸学报》编辑部 2019,34(3):31-37 |
| 浆浓及助留助滤剂对桉木浆纤维悬浮液屈服应力的影响 |
| 张晓雪,王 晨,沈 军,张 辉* |
| 《中国造纸学报》编辑部 2019,34(3):38-42 |
| 制浆材木质素含量近红外分析模型传递研究 |
| 刘耀瑶,杨 浩,熊智新*,梁 龙,房桂干 |
| 《中国造纸学报》编辑部 2019,34(3):43-49 |
| 纸张干燥特性曲线影响因素实验研究 |
| 陈晓彬,王宇航,何耀辉,董云渊,郑启富,李继庚,刘焕彬 |
| 《中国造纸学报》编辑部 2019,34(3):50-53 |
| 基于PCA的纸病特征再提取算法研究 |
| 王思琦,周 强,田杏芝 |
| 《中国造纸学报》编辑部 2019,34(3):54-60 |
| 纳米纤维素材料氧气与水蒸气阻隔性能的研究现状 |
| 罗嘉倩,苏艳群*,刘金刚,李 群 |
| 《中国造纸学报》编辑部 2019,34(3):61-70 |
| 聚乳酸-纳米纤维素复合薄膜的制备及应用研究进展 |
| 张 萌,冀嘉钰,樊 丽,刘鹏涛* |
| 《中国造纸学报》编辑部 2019,34(3):71-76 |
| 生物质精炼技术与制浆造纸的结合 |
| 陈丽卿 |
| 《中国造纸学报》编辑部 2019,34(3):77-81 |
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| 表面活性剂改善黏胶级竹溶解浆的反应性能 |
| CHEN Qiuyan, MA Xiaojuan, HUANG Liulian*, CAO Shilin and MIAO Qingxian |
| 2019,34(3):1-5 |
| 采用太古油（TRO）、聚氧乙烯蓖麻油（PCO）、聚醚多元醇（PP）3种表面活性剂对竹溶解浆原料进行处理，以改善竹溶解浆的反应性能；考察了不同表面活性剂及其用量对竹溶解浆Fock反应性能及黏胶过滤性能的影响，得到竹溶解浆反应性能改善效果最佳的表面活性剂及其优化用量，并研究了Fock反应性能与黏胶过滤性能的关系；分析及比较了上述3种表面活性剂在最优条件下对竹溶解浆的孔隙结构及比表面积、碱液的表面张力、黏胶流变行为的影响，揭示了表面活性剂改善竹溶解浆反应性能的机理。结果表明，TRO对竹溶解浆反应性能的改善效果最优，最佳用量为1.5%，此时，Fock反应性能及黏胶过滤值分别为81.7%和96.9 s，且当Fock反应性能超过77%时，所得的黏胶均能够达到过滤要求；TRO对竹溶解浆比表面积及孔隙结构的改善效果最好，并显著降低碱液的表面张力和提高黏胶的表观黏度，这与竹溶解浆反应性能的改善一致。 |
| [摘要] [PDF] |
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| 多羧基纤维素纳米晶的制备与性能研究 |
| ZHANG Yanjie, HUANG Jin and MA Xiaozhou* |
| 2019,34(3):6-12 |
| 采用乙二胺四乙酸二酐（EDTAD）酯化法制备表面羧基含量及羟基取代度可控的多羧基化纤维素纳米晶（ECNC），并通过改变酯化条件，优化实验结果；通过傅里叶变换红外光谱（FTIR）、透射电子显微镜（TEM）、电导滴定、X射线衍射（XRD）、元素分析、Zeta电位等对ECNC进行分析。结果表明，ECNC保持了CNC的形貌和结晶结构完整性，并且在水和磷酸盐（PBS）缓冲溶液中的分散性较CNC显著提高；同时，通过改变酯化反应条件可控制ECNC表面羧基含量及羟基取代度。该ECNC颗粒有望用于高性能复合纳米材料的制备及功能化纳米复合颗粒的制备中。 |
| [摘要] [PDF] |
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| Mg（OH）2粒径对辐射松氧脱木素的影响 |
| NING Dengwen, CHENG Yanan, FU Changming, CHEN Liu, HUANG Hai, CAO Shilin, HUANG Fang* and NI Yonghao |
| 2019,34(3):13-17 |
| 为进一步探讨镁盐作为纤维素保护剂的作用机制，研究了纸浆氧脱木素过程中添加不同粒径（20、50、100、200、500 nm）的Mg（OH）2对添加多种过渡金属离子（Cu2+、Mn2+和Fe3+）的辐射松硫酸盐浆氧脱木素的影响，通过测定氧脱木素后纸浆卡伯值和黏度，分析不同粒径Mg（OH）2对纤维素的保护效果。研究结果表明，在纸浆氧脱木素过程中，不同粒径的Mg（OH）2对纸浆卡伯值、木素脱除率没有显著影响；但小粒径的Mg（OH）2对纸浆黏度的保护能力要优于大粒径的Mg（OH）2。氧脱木素中添加Mg（OH）2粒径越小，纸浆黏度降低越少，手抄片物理强度越大。 |
| [摘要] [PDF] |
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| 木质素基超疏水涂层的制备与表征 |
| ZHANG Yuqing, WANG Xiao, WANG Xing, LI Yao and ZHOU Jinghui* |
| 2019,34(3):18-23 |
| 利用油酸对玉米秸秆纤维素乙醇残渣木质素进行疏水改性后，配制成喷涂液喷涂于基材表面获得木质素基超疏水涂层。采用红外光谱、扫描电镜、接触角测试等分析方法对木质素基超疏水涂层进行表征。结果表明，木质素基超疏水涂层表面形貌与荷叶相似，由葡萄串状微纳米结构组成。木质素基超疏水涂层在抗酸碱腐蚀实验中表现出良好的耐酸碱性；在酸性或碱性溶液中，木质素基超疏水涂层的表面接触角始终都稳定在约153°。同时，该涂层对不同黏稠度的流体食品均有良好的抗粘附能力，相对于在普通塑料杯中，蜂蜜在该涂层表面的残留量降低了93.5%。因此，实验制得的木质素基超疏水涂层应用在食品包装容器内壁，可有效防止流体食物在包装上的残留，减少浪费。 |
| [摘要] [PDF] |
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| 基于碱脲溶剂体系胶化作用的湿强纸的制备 |
| ZHAI Rui*, WANG Huili, HU Zhijun, ZHANG Xuejin, ZHAO Huifang and Zhou Xiaofan |
| 2019,34(3):24-30 |
| 在低温及中高浓度条件下，利用氢氧化钠硫脲水溶液浸渍处理由漂白硫酸盐慈竹浆抄造的纸张，经冷冻及洗涤后制备湿强纸，通过单因素实验探究碱浓、浸渍时间、冷冻温度、冷冻时间和洗涤时间等因素对纸张强度性能的影响，并利用傅里叶变换红外光谱仪、X射线衍射仪、热重分析仪、核磁共振波谱仪和扫描电子显微镜表征处理前后纸张性能的变化情况。结果表明，在碱浓7%、浸渍时间3 s、冷冻温度-7℃、冷冻时间15 min、洗涤时间15 min的处理条件下，制得的湿强纸强度性能最好。与处理前原纸相比，在该条件下处理后纸张的干抗张指数提高了66%，干耐破指数提高了183%，湿抗张指数提高了321%，湿耐破指数提高了980%；同时处理后纸张中单根纤维的含量显著降低，且处理前后纸张纤维的官能团结构、无定形区和结晶区结构、热力学性能以及碳骨架结构均没有明显变化。 |
| [摘要] [PDF] |
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| 磷酸活化法脱墨污泥活性炭的改性研究 |
| WAN Yueliang, MENG Xiangmei, FENG Kun, KONG Huazheng and LIU Tingzhi* |
| 2019,34(3):31-37 |
| 以Cr（Ⅵ）离子吸附效果为目标，对磷酸活化法制备的脱墨污泥活性炭进行改性。通过改性效果对比，确定了HNO3改性方法，并对其改性工艺进行了优化。得到最佳改性条件为：10 mol/L的HNO3作为改性剂、炭酸比1∶15（m∶V）、改性2.0 h。改性后活性炭用于废水吸附以去除Cr（Ⅵ）离子，在改性活性炭用量为5.00 g/L时，Cr（Ⅵ）离子的去除率和吸附量分别达到83.9%和25.17 mg/g，与未改性活性炭相比，吸附量提高了140.3%。改性活性炭的碘吸附值和亚甲基蓝吸附值分别达到543.92 mg/g和103.5 mg/g，碘吸附值提高了28.9%，而亚甲基蓝吸附值略有降低。N2吸附脱附表明，与未改性活性炭相比，HNO3改性活性炭比表面积从715.576 m2/g增至1020.161 m2/g，增大了42.6%；总孔容由0.353 cm3/g增长到0.608 cm3/g，提高了72.4%；中孔孔容由0.344 cm3/g增长到0.393 cm3/g，增长了14.2%。结果表明，HNO3改性可大幅提升脱墨污泥活性炭对Cr（Ⅵ）离子吸附性能。 |
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| 浆浓及助留助滤剂对桉木浆纤维悬浮液屈服应力的影响 |
| ZHANG Xiaoxue, WANG Chen, SHEN Jun and ZHANG Hui |
| 2019,34(3):38-42 |
| 纸浆纤维悬浮液的屈服应力（τy）是纸浆流体力学的关键流变参数。研究了桉木漂白硫酸盐浆（BKP）的浆浓（Cm）以及分别添加阳离子聚丙烯酰胺（CPAM）和阳离子淀粉对其纤维悬浮液屈服应力的影响。结果表明，在稳态剪切条件下，桉木BKP纤维悬浮液屈服应力随浆浓的升高而迅速增大，两者符合指数关系，即τy=aCbm（a=3.20，b=2.62）；添加CPAM或阳离子淀粉后，两者仍满足该指数关系，但添加CPAM后，a值减小、b值增大，而添加阳离子淀粉后，a和b值均在原来的基础上上下浮动。浆浓一定的桉木BKP，其屈服应力随CPAM添加量的增加，先增大后减小，但仍大于不添加CPAM桉木BKP纤维悬浮液的屈服应力；当浆浓为4.0%、添加约0.6%（相对于绝干浆质量，下同）的CPAM时，其屈服应力增幅最多，达30%；随着阳离子淀粉添加量的增加，屈服应力先增大后减小，当添加约为2.5%的阳离子淀粉、浆浓4.0%时，桉木BKP纤维悬浮液屈服应力下降最多，降低了约25.4%。 |
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| 制浆材木质素含量近红外分析模型传递研究 |
| LIU Yaoyao, YANG Hao, XIONG Zhixin*, LIANG Long and FANG Guigan |
| 2019,34(3):43-49 |
| 为研究制浆材中木质素含量近红外分析模型在两台便捷式近红外光谱仪间的传递，对制浆材木质素样品近红外光谱数据集进行代表性样本的选取、光谱预处理和界外样本的剔除，建立了源机的优化偏最小二乘（PLS）校正模型。分别采用斜率截距算法（S/B）、直接校正算法（DS）和典型相关分析算法（CCA）进行源机与目标机间的模型传递并比较了预测效果。结果表明，S/B算法模型传递效果较差，而经DS算法和CCA算法模型传递后的预测效果均有大幅提升。DS算法模型传递后决定系数（R2）、预测标准差（RMSEP）和相对标准差（RPD）分别为0.9643、1.0370%和5.3513；CCA算法模型传递后R2为0.9540、RMSEP为1.1766%、RPD为4.7711。因此，DS算法和CCA算法均可实现制浆材木质素含量近红外分析模型在两台便携式近红外光谱仪之间的传递。 |
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| 纸张干燥特性曲线影响因素实验研究 |
| CHEN Xiaobin*, WANG Yuhang, HE Yaohui, DONG Yunyuan, ZHENG Qifu, LI Jigeng and LIU Huanbin |
| 2019,34(3):50-53 |
| 采用控制变量法，研究了纤维原料种类、成纸定量、纸浆打浆度、压榨压力和干燥温度5个因素对纸张干燥特性曲线的影响。结果表明，纤维原料种类和纸浆打浆度对纸张干燥特性曲线影响较小，但纸浆打浆度会影响纸张干燥前初始含水率，打浆度越大，纸张干燥前初始含水率越高；纸张定量与厚度正相关，对纸张干燥特性曲线影响显著，定量越大，纸张越难干燥；压榨降低了纸张干燥初始含水率，加速了干燥过程，可能的原因是挤压后，纸张中部分难干燥的毛细管水转变成了容易干燥的游离水；由于纸张干燥是传热与传质同时发生的过程，干燥温度越高，传热动力大，促使蒸发传质发生，干燥越容易。 |
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| 基于PCA的纸病特征再提取算法研究 |
| WANG Siqi*, ZHOU Qiang and TIAN Xingzhi |
| 2019,34(3):54-60 |
| 针对传统纸病检测中相似纸病辨识准确率低及纸病提取特征维数高致使纸病辨识过程时间较长的问题，提出一种基于主成分分析（PCA）的纸病特征再提取算法。该算法以多种纸病的图像为研究对象，对可能存在相关关系的高维原始纸病特征量进行PCA降维处理并去除相关成分，形成相互独立且更具代表性的纸病新特征，在减少数据处理量的同时使纸病辨识准确率明显提高。实验表明，PCA算法可显著提高纸病辨识准确率并可大幅缩短算法平均运行时间。 |
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| 纳米纤维素材料氧气与水蒸气阻隔性能的研究现状 |
| LUO Jiaqian, SU Yanqun*, LIU Jingang and LI Qun |
| 2019,34(3):61-70 |
| 纳米纤维素主要来源于植物纤维，具有比表面积高、强度高、密度低、透明性高、热膨胀低等特点，其特有的形态结构和表面性能使得纳米纤维素材料可以形成致密的网络结构进而提供优良的阻隔性能。本综述就纯纳米纤维素膜、纳米纤维素复合材料以及纳米纤维素涂布纸基材料重点讨论了纳米纤维素材料氧气与水蒸气阻隔性能的研究现状，以探讨纳米纤维素应用于包装材料的可能性。 |
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| 聚乳酸-纳米纤维素复合薄膜的制备及应用研究进展 |
| ZHANG Meng, JI Jiayu, FAN Li and LIU Pengtao* |
| 2019,34(3):71-76 |
| 聚乳酸（PLA）是一种绿色高分子材料，原料来源充足、无污染且可被生物降解。同时，PLA还具有良好的机械性能和物理性能，易被加工制作成膜。纳米纤维素（NC）也是一种天然的可再生资源，来源广泛、机械强度好且刚度高。将NC加入到PLA中制备复合薄膜可大幅提高复合薄膜的机械性能；但两者的界面相容性差，从而影响PLA-NC复合薄膜的机械性能。根据近几年国内外的研究文献，本文综述了PLA-NC复合薄膜的制备工艺、界面相容性的改善方法及其应用。 |
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| 生物质精炼技术与制浆造纸的结合 |
| CHEN Liqing |
| 2019,34(3):77-81 |
| 生物质精炼技术发展与应用是对传统制浆造纸产业转变发展方式的变革与创新，对造纸行业可持续发展具有战略意义。文章主要介绍了部分制浆造纸生物质精炼技术，包括半纤维素的分离纯化及利用、纤维素的高值化利用、黑液中木质素的分离提纯与利用、黑液气化等。 |
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| Improving the Reactivity of Bamboo Dissolving Pulp for Viscose Rayon Production by Surfactant Treatment |
| CHEN Qiuyan, MA Xiaojuan, HUANG Liulian*, CAO Shilin and MIAO Qingxian |
| 2019,34(3):1-5 |
| Study on Preparation and Properties of Multi-carboxyl Cellulose Nanocrystal |
| ZHANG Yanjie, HUANG Jin and MA Xiaozhou* |
| 2019,34(3):6-12 |
| Effect of the Particle Size of Mg（OH）2 on the Oxygen Delignification of Radiata Pine Kraft Pulp |
| NING Dengwen, CHENG Yanan, FU Changming, CHEN Liu, HUANG Hai, CAO Shilin, HUANG Fang* and NI Yonghao |
| 2019,34(3):13-17 |
| Preparation and Characterization of Lignin-based Superhydrophobic Coatings |
| ZHANG Yuqing, WANG Xiao, WANG Xing, LI Yao and ZHOU Jinghui* |
| 2019,34(3):18-23 |
| Preparation of Wet-strength Paper Based on the Jellification of Alkali-urea System |
| ZHAI Rui*, WANG Huili, HU Zhijun, ZHANG Xuejin, ZHAO Huifang and Zhou Xiaofan |
| 2019,34(3):24-30 |
| Research on Modification of Activated Carbon from Deinking Sludge |
| WAN Yueliang, MENG Xiangmei, FENG Kun, KONG Huazheng and LIU Tingzhi* |
| 2019,34(3):31-37 |
| Influence of the Pulp Consistency and Addition of Retention and Drainage Aids on the Yield Stress of Eucalyptus Pulp Fiber Suspension |
| ZHANG Xiaoxue, WANG Chen, SHEN Jun and ZHANG Hui |
| 2019,34(3):38-42 |
| Study on Near-infrared Calibration Model Transfer for Lignin Content in Pulpwood |
| LIU Yaoyao, YANG Hao, XIONG Zhixin*, LIANG Long and FANG Guigan |
| 2019,34(3):43-49 |
| Experimental Study on Influence Factors of Paper Drying Characteristic Curve |
| CHEN Xiaobin*, WANG Yuhang, HE Yaohui, DONG Yunyuan, ZHENG Qifu, LI Jigeng and LIU Huanbin |
| 2019,34(3):50-53 |
| Research on Re-extraction Algorithm of Paper Defect Characteristics Based on PCA |
| WANG Siqi*, ZHOU Qiang and TIAN Xingzhi |
| 2019,34(3):54-60 |
| Oxygen and Water Vapor Barrier Properties of Nanocellulose Materials: A Review |
| LUO Jiaqian, SU Yanqun*, LIU Jingang and LI Qun |
| 2019,34(3):61-70 |
| Research Progress in Preparation and Application of Poly（lactic acid）-Nanocellulose Composite Films |
| ZHANG Meng, JI Jiayu, FAN Li and LIU Pengtao* |
| 2019,34(3):71-76 |
| The Combination of Biorefinery with Pulp and Paper Industry |
| CHEN Liqing |
| 2019,34(3):77-81 |
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| Improving the Reactivity of Bamboo Dissolving Pulp for Viscose Rayon Production by Surfactant Treatment |
| CHEN Qiuyan, MA Xiaojuan, HUANG Liulian*, CAO Shilin and MIAO Qingxian |
| 2019,34(3):1-5 |
| Three kinds of surfactants including Turkey Red Oil （TRO）， Polyoxyethylene Castor Oil （PCO） and Polyether Polyol （PP） were used for improving the reactivity of bamboo dissolving pulp. The effects of different surfactants and their dosages on the Fock reactivity and viscose filterability/reactivity of bamboo dissolving pulp were investigated. The best surfactant and its optimized dosage were obtained， and the relationship between Fock reactivity and viscose filterability was also studied. Under the optimum conditions， by analyzing and comparing the effects of the above three kinds of surfactants on pore structure, specific surface area of the pulp， surface tension of lye and rheological behavior of viscose， the mechanism of reactivity improvement of surfactant treatment was revealed. The results showed that TRO had the best effect on improving the reactivity of the bamboo dissolving pulp. The optimum dosage of TRO was 1.5%. Under this condition， the Fock reactivity and the viscose filterability were 81.7% and 96.9 s， respectively. When the Fock reactivity of bamboo dissolving pulp exceeded 77%， the obtained viscose could meet the filterability requirements. TRO had the best effect on improving the specific surface area and pore structure of bamboo dissolving pulp， and significantly reduced the surface tension of lye and increased the apparent viscosity of the viscose， which was accorded with the improvement of the reactivity of the bamboo dissolving pulp． |
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| Study on Preparation and Properties of Multi-carboxyl Cellulose Nanocrystal |
| ZHANG Yanjie, HUANG Jin and MA Xiaozhou* |
| 2019,34(3):6-12 |
| Multi-carboxyl cellulose nanocrystal （ECNC） with controllable carboxyl content and substitution degree of hydroxyl was obtained by EDTAD-esterification. The results were optimized by changing the esterification conditions. FT-IR， TEM， conductimetric titration， XRD， elemental analysis and Zeta potential test were used to characterize the property of ECNC. It was found that the morphology and the integra-lity of crystal structure of cellulose nanocrystals （CNC） were maintained during EDTAD-esterification， and the dispersity of CNC in water and PBS buffer could also be improved. At the same time， the surface carboxyl content of ECNC and substitution degree of hydroxyl could be controlled by changing the esterification conditions. It was believed that ECNC could be used in the fabrication of high-efficiency nanocomposite polymers and particles． |
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| Effect of the Particle Size of Mg（OH）2 on the Oxygen Delignification of Radiata Pine Kraft Pulp |
| NING Dengwen, CHENG Yanan, FU Changming, CHEN Liu, HUANG Hai, CAO Shilin, HUANG Fang* and NI Yonghao |
| 2019,34(3):13-17 |
| To further explore the mechanism of magnesium salt as a cellulose protectant in oxygen delignification， different particle sizes （20， 50， 100， 200， 500 nm） of Mg（OH）2 were added in the oxygen delignification system， various transition metal ions （Cu2+， Mn2+ and Fe3+） were introduced into the pulp before the addition of magnesium salts. The effects of Mg（OH）2 on the pulp viscosity and Kappa numbers were studied. The results showed that Mg（OH）2 with different particle sizes had no significant effects on Kappa number and lignin removal rate during oxygen delignification. However， the smaller particle size of Mg（OH）2 had superior pulp viscosity protection ability than the bigger particle size. The smaller particle size of Mg（OH）2 was added in oxygen delignification， the pulp had lower viscosity reduction and greater handsheet physical strength． |
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| Preparation and Characterization of Lignin-based Superhydrophobic Coatings |
| ZHANG Yuqing, WANG Xiao, WANG Xing, LI Yao and ZHOU Jinghui* |
| 2019,34(3):18-23 |
| In this paper， cellulose ethanol residue lignin was selected as the substrate for preparation of superhydrophobic coatings， and the lignin surface was hydrophobically modified by oleoyl chloride， then the obtained oleic acid modified lignin was dissolved and sprayed on the substrate surface to obtain the lignin-based superhydrophobic coatings. The lignin-based superhydrophobic coatings were characterized by infrared spectroscopy， scanning electron microscopy， contact angle test. The results showed that the surface morphology of the lignin-based superhydrophobic coatings was similar to that of lotus leaf， and it was composed of grape stringlike micro-nanostructure. Lignin-based superhydrophobic coatings showed good acid/alkali resistance in acid/alkali corrosion test. The contact angle of lignin-based superhydrophobic coa-tings was always stable at about 153 degrees in acid or alkaline solution. At the same time， the coatings had good anti-adhesion ability for liquid foods with different viscosities. The residue of honey in lignin-based superhydrophobic coated PP cup decreased by 93.5%, compared to that in noncoated PP cup. Therefore, the lignin-based superhydrophobic coatings could effectively prevent the residue of liquid food and reduce waste when applying on the inner wall of the food packaging containers． |
| [Abstract] [PDF] |
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| Preparation of Wet-strength Paper Based on the Jellification of Alkali-urea System |
| ZHAI Rui*, WANG Huili, HU Zhijun, ZHANG Xuejin, ZHAO Huifang and Zhou Xiaofan |
| 2019,34(3):24-30 |
| In this work， the paper made from bleached bamboo （Sinocalamus affinis） kraft pulp was soaked in the NaOHurea aqueous solution， and then freezing and washing processes were applied to prepare wetstrength paper. The effects of alkali concentration， soaking time， freezing temperature， freezing time， and washing time were evaluated by singlefactor experiments. The analyses of FTIR， XRD， TGA， NMR and SEM were applied to reveal the variations of the microproperties of the untreated and treated papers. The optimal preparation conditions were determined as the follows: alkali concentration of 7%， soaking time of 3 s， freezing temperature of -7℃， freezing time of 15 min， and washing time of 15 min. Compared with untreated paper， under the optimal conditions， the dry tensile index of the treated paper increased by 66%， the dry burst index increased by 183%， the wet tensile index increased by 320%， and the wet burst index increased by 980%. There were no significant variations of functional groups and the structures of amorphous or crystalline regions， however， the amount of individual fibers in the treated paper decreased significantly． |
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| Research on Modification of Activated Carbon from Deinking Sludge |
| WAN Yueliang, MENG Xiangmei, FENG Kun, KONG Huazheng and LIU Tingzhi* |
| 2019,34(3):31-37 |
| The activated carbon prepared from deinking sludge was modified and applied to the adsorption of Cr（VI）ion， the optimal modification conditions were determined as follows: modifier was 10 mol/L HNO3， 1∶15 （m∶V）， modification time 2.0 h. The modified activated carbon was used to remove Cr（VI） ion from waste water. When the amount of modified activated carbon was 5 g/L， the removal rate and adsorption capacity of Cr（VI）ion were 83.9% and 25.17 mg/g， respectively， and the adsorption capacity increased by 140.3% compared with that of unmodified activated carbon， the iodine adsorption value and methylene blue adsorption value of the activated carbon were 543.92 mg/g and 103.5 mg/g respectively， the iodine adsorption capacity increased by 28.9%. The specific surface area of activated carbon was 1020.161 m2/g， increased by 42.6%， the total pore volume was about 0.608 cm3/g， increased by 72.4% and the mesopore volume was about 0.393 cm3/g， increased by 14.2%， based on the calculation by the N2 adsorption-desorption experiment． |
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| Influence of the Pulp Consistency and Addition of Retention and Drainage Aids on the Yield Stress of Eucalyptus Pulp Fiber Suspension |
| ZHANG Xiaoxue, WANG Chen, SHEN Jun and ZHANG Hui |
| 2019,34(3):38-42 |
| The yield stress （τy） of pulp fiber suspension is a key rheological parameter. The influence of consistency （Cm） of eucalyptus bleached kraft pulp， the amounts of addition of CPAM or cationic starch on τy of the eucalyptus pulp fiber suspension was studied. The results showed that, ， in the steadystate shear condition， the τy of eucalyptus pulp fiber suspension increased rapidly with the increase of Cm， their relationship was accorded with the exponential relation τy=aCbm（a=3.20， b=2.62）. After adding CPAM or cationic starch to eucalyptus pulp fiber suspension， the exponential relation was still satisfied， but the values of a and b changed. After adding CPAM， a would decrease， and b would go up. After adding cationic starch， both a and b floated up and down on the original basis. For eucalyptus pulp fiber suspension with certain Cm， the τy would first increase then decrease with the increase of CPAM addition, but the τy was still stronger than the τy of blank pulp fiber suspension. The τy of eucalyptus pulp fiber suspensions increased by up to 30% when Cm was 4.0% and the CPAM addition amount was about 0.6%. With the addition of cationic starch， the τy of eucalyptus pulp fiber suspension increased first then decreased. When the amount of cationic starch was about 2.5% and Cm was 4.0%， the τy of eucalyptus pulp fiber suspension decreased by 25.4%. |
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| Study on Near-infrared Calibration Model Transfer for Lignin Content in Pulpwood |
| LIU Yaoyao, YANG Hao, XIONG Zhixin*, LIANG Long and FANG Guigan |
| 2019,34(3):43-49 |
| The near-infrared calibration model transfer for lignin content in pulpwood was investigated between two portable near-infrared spectrometers. An optimal calibration model of master was established by partial least square （PLS） after the selection of representative infrared spectroscopy data net samples， preprocessing and eliminating outlier samples. The nearinfrared spectroscopy calibration model was transferred between master and slave by the algorithms of slope/bias （S/B）， direct standardization （DS） and canonical correlation analysis （CCA）， respectively， and the prediction results were compared. The results indicated that the models transferred by DS and CCA improved the prediction accuracy significantly comparing to the algorithm of S/B with a poor performance. The coefficient of determination （R2）， root mean square error of prediction （RMSEP） and ratio of performance to standard deviate （RPD） by DS were 0.9643， 1.0370%， 5.3513， and by CCA were 0.9540， 1.1766%， 4.7711， respectively. Therefore， both DS and CCA algorithms could achieve the calibration model transfer between the two portable near-infrared spectrometers． |
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| Experimental Study on Influence Factors of Paper Drying Characteristic Curve |
| CHEN Xiaobin*, WANG Yuhang, HE Yaohui, DONG Yunyuan, ZHENG Qifu, LI Jigeng and LIU Huanbin |
| 2019,34(3):50-53 |
| The effects of fiber material， paper basis weight， pulp beating degree， pressing pressure and drying temperature on paper drying characteristic curve were researched in the study. The experimental results showed that: different fiber material and pulp beating degree had little influence on the paper drying characteristic curve， but pulp beating degree affected the initial moisture content of paper drying， the higher pulp beating degree， the higher the initial moisture content was. Paper basis weight had obvious influence on paper drying characteristic curve because of its positive corrilation with paper thickness， the greater the paper basis weight， the harder it was to dry. Pressing pressure not only affected the paper initial moisture content， but also accelerated the drying process. The possible reason was that after the paper was pressed， part of the capillary water which is difficult to dry changed to free water which is easy to dry. Because of the coupling process of heat and mass transfer in paper drying， the higher drying temperature， the greater heat and mass transfer power， and the easier drying occurs． |
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| Research on Re-extraction Algorithm of Paper Defect Characteristics Based on PCA |
| WANG Siqi*, ZHOU Qiang and TIAN Xingzhi |
| 2019,34(3):54-60 |
| Because of the low accuracy in identification of similar paper defects in traditional paper defect detection and the slow running speed of the system caused by high feature dimension extraction， a PCA-based paper defect feature re-extraction algorithm was proposed. This method took various paper defect images as the research object， PCA was adoped to deal with the dimension reduction of high-dimensional original features that may have correlations and remove their related components so as to form new defect features which were indepen-dent and more representative， so that the data processing amount was reduced. At the same time， the identification accuracy of paper defects could be significantly improved. Experiments showed that the algorithm could significantly improve the accuracy of paper defect identification and the average running time of the system was greatly shortened． |
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| Oxygen and Water Vapor Barrier Properties of Nanocellulose Materials: A Review |
| LUO Jiaqian, SU Yanqun*, LIU Jingang and LI Qun |
| 2019,34(3):61-70 |
| Nanocellulose is a plant-based environmentally friendly nanomaterials with high crystallinity， high strength and other properties， which can form a dense network structure that blocks the transmission of molecules and has the potential to be a green barrier packaging material. In this paper， the oxygen and water vapor barrier properties of nano-cellulosic materials are elaborated from three different application forms including nanocellulose films， nanocellulose composite materials and paper-based material coated with nanocellulose． |
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| Research Progress in Preparation and Application of Poly（lactic acid）-Nanocellulose Composite Films |
| ZHANG Meng, JI Jiayu, FAN Li and LIU Pengtao* |
| 2019,34(3):71-76 |
| Poly（lactic acid） （PLA） is a green polymer which has abundant sources of raw materials， and can be biodegraded completely by organisms. Meanwhile， poly（lactic acid） has good mechanical properties and physical properties， and it is easy to be processed into films. Nanocellulose （NC） is a kind of natural renewable resource with rich sources. Its mechanical strength and stiffness are very high. Nanocellulose can be used to increase the mechanical properties of poly（lactic acid） films， and the composite films have a wide range of applications and development prospects in various fields. But poly（lactic acid） is a hydrophobic material， nanocellulose is a hydrophilic material， and the mechanical properties of the films will be influenced by their poor interfacial compatibility. In this paper， the preparation methods and applications of poly（lactic acid）-nanocellulose composite films and the methods to improve their interfacial compatibility were summarized． |
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| The Combination of Biorefinery with Pulp and Paper Industry |
| CHEN Liqing |
| 2019,34(3):77-81 |
| The development and application of biorefinery technology is the change and innovation of traditional pulp and paper industry, and is essential for the sustainable development of the pulp and paper industry. This paper mainly introduces the pulp and paper biomass refining technologies, including the extraction and comprehensive utilization of hemicelluloses, highvalue utilization of cellulose, the separation, purification and utilization of lignin in black liquor, black liquor gasification, etc. |
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