Effect of enzyme beating on grinding method for microfibrillated cellulose preparation as a paper strength enhancer

Kim, Kang-Jae; Lee, Jung Myoung; Ahn, Eun-Byeol; Eom, Tae-Jin

doi:10.1007/s10570-017-1368-9

Cited by 14 publications

(5 citation statements)

References 23 publications

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“…In the transverse grinding, the relative movement direction between the contact wheel and the blade is perpendicular to the width direction of the contact wheel, so the processing bandwidth of each path is equal to the width of the contact wheel, which can significantly reduce the track density and greatly improve the processing efficiency. However, due to the wide processing belt, it is easy to have different grinding depths on the same path, so the machining accuracy of this grinding method is relatively low [14]. When the spiral is ground, it also has a large processing bandwidth, and the processing method of the spiral can reduce the number of lifting and improve the processing efficiency.…”

Section: Grinding Mode Selectionmentioning

confidence: 99%

Mechanical grinding method of multi-axis linkage for elliptic contour based on algebraic geometry

2020

THERM SCI

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Aiming at the shortcomings of traditional elliptic contour grinding methods, such as large grinding roughness and poor contour accuracy, a multi-axis mechanical grinding method based on algebraic geometry is proposed. This method studies the first attempt of elliptic contour. The process includes selecting suitable multi-axis grinding tools and selecting appropriate grinding methods according to grinding process. Using specific workpieces, grinding path planning, motion attitude determination and error compensation based on algebraic geometry for multi-axis mechanical grinding are carried out. The results show that compared with the traditional grinding method, the device has the smallest surface roughness, the contour radian is closer to the expected results, and has higher performance, which solves the grinding defects.

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Section: Grinding Mode Selectionmentioning

confidence: 99%

Mechanical grinding method of multi-axis linkage for elliptic contour based on algebraic geometry

2020

THERM SCI

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“…The short fibers produced by enzyme hydrolysis had almost no fibrillation and had a smooth surface, unlike the fibers treated with the beater. The crystallinity of the enzyme-pretreated BKP fibers increased depending on the enzyme loading because cellulase attacks and removes amorphous regions in the fibers (Kumar and Wyman 2010;Kim et al 2017). When the BKPs were beaten to 450 mL CSF, the fiber length of the Ba-BKP decreased by 25.9%, and that of the Hw-BKP decreased by 11.9%.…”

Section: Characteristics Of Bkp Fibers Pretreated By Enzymementioning

confidence: 99%

“…Cellulase, an enzyme acting on cellulose, occurs in three types: endo-glucanase, exo-glucanase (cellobiohydrolase), and β-glucosidase, depending on the mode of action (Jayasekara and Ratnayake 2019). Endo-glucanase cleaves the β-1,4 glycosidic bonds of cellulose; thus, the amorphous region is preferentially hydrolyzed, thereby reducing the size of the fibers and increasing the crystallinity (Kim et al 2017). Some studies showed that cellulase reduced the fiber length rapidly and produced fines, thereby lowering the strength characteristics of paper (Lecourt et al 2010;Buzala et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of nanofibrillated cellulose made from enzyme-pretreated bamboo pulp on paper strength

Lee

Kim

et al. 2020

BioRes

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The applicability of bleached bamboo kraft pulp (Ba-BKP) was explored as a raw material for the manufacture of nanofibrillated cellulose (EN-NFC) made of enzyme-pretreated pulps and the effects of the EN-NFC on enhancing paper strength. The Ba-BKP was pretreated using an endo-glucanase enzyme at 50 °C and pH 6, after which the EN-NFC was made by micro-grinding. Bleached hardwood kraft pulp (Hw-BKP) was used as a control, and the non-enzymatic refining pretreatment of BKPs was compared with the enzyme pretreatment. The EN-NFC was incorporated into handsheets, and the sheet strengths were measured. The physical properties of the NFC made from the Ba-BKP were similar to those made from the Hw-BKP. The NFC prepared following enzyme pretreatment were smaller and more uniform than those pretreated with refining. The EN-NFC made from the Ba-BKP was effective at enhancing tensile index by 52.7%, and burst index by 210.2% when 2% of EN-NFC was added in the furnish, and those of handsheets containing the EN-NFC made from Hw-BKP showed the similar improvement. Therefore, Ba-BKP can be used as a raw material for the manufacture of EN-NFC that confers similar physical properties and strength enhancement to paper as those made from Hw-BKP.

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“…Cellulase enzymes have mainly been used directly in pulp for achieving higher drainage with potentially improved paper mechanical properties (Maximino et al 2011;Kim et al 2017). Endoglucanase activity can effectively catalyze hydrolysis of crystalline and amorphous structure of cellulose and reduce the refining energy (Nagl et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Reduction of fines in recycled paper white water via cellulase enzymes

Jevtović,

Zivković,

Milivojević

et al. 2023

BioRes

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Due to the high wastepaper recyclability and water-loop system closure, packaging paper mills struggle with increased fines, causing runnability issues. Cellulase enzymes are a preferred treatment choice for the improvement of the pulp refining in stock preparation area but are not widely used or easy to introduce in the production process. Different cellulase enzymes were tested, and those with the highest activity were introduced to the white-water (WW) samples with the aim to reduce fines content as potentially new enzyme applications on the paper machine. The first portion of the study involved the development of an experiment model to find and confirm the optimal enzyme process parameters (40 °C, pH 5.7, reaction time 3 h, and 0.18% v/v enzyme addition) for laboratory made white-water. The second portion of the study included turbidity, colloidal charge, flow cytometry (FCM), and chemical oxygen demand (COD) analysis on industrial and laboratory made white-water samples at optimized process parameters. Obtained results corresponded to reduced fines content in white-water samples, which justified commercial usage of cellulase enzymes on recycled paper machine short loop and potentially increased machine runnability without negative influence on wastewater treatment plant.

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Effect of enzyme beating on grinding method for microfibrillated cellulose preparation as a paper strength enhancer

Cited by 14 publications

References 23 publications

Mechanical grinding method of multi-axis linkage for elliptic contour based on algebraic geometry

Mechanical grinding method of multi-axis linkage for elliptic contour based on algebraic geometry

Effect of nanofibrillated cellulose made from enzyme-pretreated bamboo pulp on paper strength

Reduction of fines in recycled paper white water via cellulase enzymes

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