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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)。 |
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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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