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Study on Clean Production Technology in High-yield Semi-chemical Pulping with Woodchip Rejects
Received:May 15, 2022  
DOI：10.11980/j.issn.0254-508X.2022.06.017
Key Words:woodchip rejects  semi-chemical pulp  high-consistency refining  corrugation medium  ring crush strength
Fund Project:国家重大科技专项（2014ZX07213001，2017ZX07402004）；广东省植物资源生物炼制重点实验室基金（2021GDKLPFR-K02）。
Author NameAffiliationPostcode
ZHANG Wei State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
Shandong Sunpaper Industry Joint Stock Co.， Ltd.， Jining， Shandong Province， 272100 		272100
XU Jun State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
Shandong Sunpaper Industry Joint Stock Co.， Ltd.， Jining， Shandong Province， 272100
Guangdong Provincial Key Lab of Plant Resources Biorefinery， Guangzhou， Guangdong Province， 510006 		510006
YING Guangdong Shandong Sunpaper Industry Joint Stock Co.， Ltd.， Jining， Shandong Province， 272100 272100
CAO Yanjun Shandong Sunpaper Industry Joint Stock Co.， Ltd.， Jining， Shandong Province， 272100 272100
CHEN Kefu State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
Shandong Sunpaper Industry Joint Stock Co.， Ltd.， Jining， Shandong Province， 272100 		272100
ZANG Zijia Shandong Sunpaper Industry Joint Stock Co.， Ltd.， Jining， Shandong Province， 272100 272100
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Abstract:Taking the woodchip rejects filled from the chip screening systems of a papermaking mill as the raw material， the lab-scale process and industrial process of caustic soda semi-chemical pulping were studied. The results showed that pulp with a high yield and ring crush strength was obtained via semi-chemical pulping from woodchip rejects， of which the properties were significantly affected by the alkaline dosage. The breaking length and ring crush index of the pulp pretreated with 14% NaOH followed by two-stage high-consistency refining process with paper concentration of 22% could reach 2.89 km and 9.76 N·m/g， respectively， which was 1.9 times and 1.2 times higher than that of the paper pretreated with 8% NaOH， and also better than the OCC paper used in the domestic mill at present. Furtherly， the indicators of the paper obtained in the industrial process were consistent with the laboratory. The tightness and ring crush strength of the prepared paper reached AA grade and A grade of corrugation medium in GB/T 13023—2008.
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