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Chemistry and Industry of Forest Products ›› 2019, Vol. 39 ›› Issue (6): 109-114.doi: 10.3969/j.issn.0253-2417.2019.06.015

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Effect of Extrusion Pretreatment on Fiber Morphology and Pulping Properties of Poplar APMP Pulp

Lulu WEI1,2,Zhenyu YAN1,Yongjun DENG1,Shanming HAN1,Long LIANG1,3,Guigan FANG1,2,3,*()   

  1. 1. Institute of Chemical Industry of Forest Products, CAF; National Engineering Lab. for Biomass Chemical Utilization; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China
    2. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
    3. Research Institute of Forestry New Technology, CAF, Beijing 100091, China
  • Received:2019-06-26 Online:2019-12-28 Published:2019-12-21
  • Contact: Guigan FANG E-mail:fangguigan@icifp.cn
  • Supported by:
    国家重点研发计划资助项目(2017YFD0601005);江苏省生物质能源与材料重点实验室基本科研业务费项目(JSBEM-S-201809)

Abstract:

The effects of twin screw extruder (TSE) and model screw device (MSD) on fiber morphology and pulping properties of pulp were investigated under the same APMP pulping process.The result showed that the low contents of fibril bundle and long fibers could be obtained under extrusion degree at the same pulping process. The TSE could result in a fiber bundle content of 1.78% in the Canada freeness of 250 mL. Compared with MSD extrusion, the extrusion decreased by 76.67%. In addition, the bursting strength and tensile strength of the pulp from TSE were higher than that of the untreated poplar and MSD treated poplar. However, the tearing strength of the pulp from TSE was lower than that of the pulp of untreated and MSD treated poplar because of the low content of long fiber. The brightness of pulp from TSE reached 65.48% in the Canada freeness of 250 mL, increased by 9.14% and 12.94% compared with MSD extrusion and the untreated poplar, respectively. The yield of the pulp was 84.54%, which was lower than the pulp yield of the MSD treated (87.20%) and the untreated poplar (87.00%), that because TSE dissolved more poplar compositions during the pulping process. Mean while, the wastewater pollution index was higher.

Key words: screw extrusion, APMP, fiber morphology, pulp property, poplar

CLC Number: