Abstract
In this study, we separately used a laboratory Hollander beater, a pilot scale 12″ single-disc refiner and an expanded trial with a commercial paper mold mill to investigate the feasibility of using thermal-alkali/enzyme pretreated rice straw semi-chemical mechanical pulp to substitute portions of old corrugated carton board (OCC) pulp in the paper industry. In the laboratory plan, sequential treatments of NaOH at a 5–10% dosage and enzymes at a 0.2–4% dosage were applied to rice straw, followed by beating using a Hollander beater for 1–2 h to complete the rice straw semi-chemical mechanical pulping process. When the NaOH dosage, enzyme dosage and refining time were 10%, 0.2% and 1 h, the best quality rice straw pulp was obtained. Along with the increase in NaOH dosage, the pulp freeness decreased significantly, and the pulp accepted rate increased. Enzymatic treatment enhanced rice straw quality only after NaOH dosage treatment, which then reacted with rice straw to increase the quality of pulp. In the expanded trial, the rice straw semi-chemical mechanical pulp was blended with OCC pulp (0%, 25%, 50%, 75% and 100%) to form handsheets. Along with an increase in rice straw proportions, the tensile index, burst index, and ring-crush index increased by 109–200%, 13–196%, and 124–187%, respectively. In an online commercial paper mold mill trial, blending rice straw pulp with OCC could successfully make paper-mold egg cartons, with both mill operation and product smoothness appearance being highly acceptable.
Highlights
In this study, we separately used a laboratory Hollander beater, a pilot scale 12′′ single-disc refiner and an expanded trial with a commercial paper mold mill to investigate the feasibility of using thermal-alkali/enzyme pretreated rice straw semi-chemical mechanical pulp to substitute portions of old corrugated carton board (OCC) pulp in the paper industry
This study separately used a laboratory Hollander beater, expanded to a pilot-scale 12” single-disc refiner, and a commercial paper mold mill online test to investigate the feasibility of using thermal-alkali/enzymatic pretreated rice straw semi-chemical mechanical pulp to substitute for old corrugated carton (OCC)
When the NaOH dosage, enzyme dosage, and refinement time increased, the rice straw pulp showed a significant decrease in pulp freeness and an increase in the acceptable fiber rate
Summary
We separately used a laboratory Hollander beater, a pilot scale 12′′ single-disc refiner and an expanded trial with a commercial paper mold mill to investigate the feasibility of using thermal-alkali/enzyme pretreated rice straw semi-chemical mechanical pulp to substitute portions of old corrugated carton board (OCC) pulp in the paper industry. Along with the development of the pulp and paper industry, the demand for papermaking raw materials has increased. This leads to gradual depletion of woody resources and escalating prices. In 2019, China implemented a policy of prohibiting waste importation and to transpire with zero wastepaper imports by 2021 This led to serious shortfalls of papermaking raw materials. Rice straw is a nonwood fiber material; it is one of most abundant agricultural wastes and a renewable biomass resource. Parameters A: NaOH dosage (%) B: Enzyme dosage (%) C: Refining time (h) year, 1.80 million tonnes of rice straw is p roduced[7]. If thick smog diffuses to the surrounding roadway, it causes traffic safety p roblems[8,9]
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