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Application of Bjorkman Number on Hardness Detection for Low-lignin-content Pulps
Received:November 18, 2023  
DOI：10.11980/j.issn.0254-508X.2024.05.017
Key Words:Bjorkman number  lignin  pulp  hardness  detection
Fund Project:浙江省重点研发项目（高性能袋泡茶滤纸的绿色制造及产业化应用示范2019C02042）。
Author NameAffiliationPostcode
XU Rong Shenzhen Academy of Inspection and Quarantine， Shenzhen， Guangdong Province， 518045
Zhejiang Kan New Material Co.， Ltd.， Suichang， Zhejiang Province， 323300 		323300
ZHOU Zhenyu* Zhejiang Kan New Material Co.， Ltd.， Suichang， Zhejiang Province， 323300 323300
KONG Yuling Zhejiang Kan New Material Co.， Ltd.， Suichang， Zhejiang Province， 323300 323300
YAN Luming Zhejiang Kan New Material Co.， Ltd.， Suichang， Zhejiang Province， 323300 323300
WU Chengfeng Testing and Technology Center for Industrial Products of Shenzhen Customs， Shenzhen， Guangdong Province， 518045 518045
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Abstract:This study compared the common points and differences in determination parameters between Kappa number， Permanganate number and Bjorkman number， analysed the advantages of Bjorkman number application on hardness monitoring for low-lignin-content pulps， and introduced the improvements in determination parameters of the company of Bjorkman number for the low-lignin-content pulps. The feasibility of the optimisation scheme was presented in terms of concentration and acidity of the solution， solid-liquid ratio of sample to reagent， reaction time and method repeatability. The 10-batch unbleached manila hemp detection data showed that the Permangate number was between 3.5 and 4.2， with a fluctuation range of 0.7. The Bjorkman number was between 23.4 and 28.2， with a range of 4.8 which showed the Bjorkman number had better sensitivitj for low lignin content pulps.
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