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Effect of Enhanced Pre-impregnation on the Pulping Properties of Chemical-mechanical Pulping with Air-dried Eucalyptus Wood Chips
Received:May 07, 2023  
DOI：10.11980/j.issn.0254-508X.2023.07.011
Key Words:chemical-mechanical pulp  air-dried eucalyptus wood chips  pre-impregnation  pulping properties
Author NameAffiliationPostcode
ZHOU Xuelin Ningbo Asian Pulp & Paper Co.， Ltd.， Ningbo， Zhejiang Province，315803 315803
HAN Shanming* Institute of Chemical Industry of Forest Products， CAF， Nanjing， Jiangsu Province， 210042 210042
JIAO Jian Institute of Chemical Industry of Forest Products， CAF， Nanjing， Jiangsu Province， 210042 210042
DENG Yongjun Institute of Chemical Industry of Forest Products， CAF， Nanjing， Jiangsu Province， 210042 210042
FANG Guigan Institute of Chemical Industry of Forest Products， CAF， Nanjing， Jiangsu Province， 210042 210042
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Abstract:The difficulty of uniform impregnation of air-dried market wood chips is a common problem in hardwood chemical mechanical pulp production lines in China. In this study， the additional stage of mechanical and chemical treatment after the conventional impregnation had been proposed to improve the impregnation of air-dried wood chips. The pulping process and pulp characteristics of current conventional chemical-mechanical pulp production processes and those of enhanced pre-impregnation processes were compared. In the enhanced pre-impregnation process， the water-repellent organic deposits in the air-dried wood chips were effectively eliminated， the homogeneous penetration of the chemicals was achieved accordingly， which not only reduced energy consumption（260 kWh/t reduction for a pulp sample with CSF 300 mL） but also improved the quality of the pulp product with higher bulk（3.50 cm3/g） and higher tensile strength （21.1 N·m/g）.
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