Fabrication of self-assembled polysaccharide multilayers on broke chemi-mechanical pulp fibers: Effective approach for paper strength enhancement

2019 ◽  
Vol 74 ◽  
pp. 170-177 ◽  
Author(s):  
Hamidreza Rudi ◽  
Hasibeh Saedi ◽  
Hossein Kermanian
Keyword(s):  
Paper Strength ◽  
Pulp Fibers ◽  
Mechanical Pulp ◽  
Strength Enhancement ◽  
Self Assembled

1H36 Strength enhancement of a stem cell-based self-assembled tissue cultured under cyclic strain

2016 ◽  
Vol 2016.28 (0) ◽  
pp. _1H36-1_-_1H36-4_
Author(s):  
Wataru YANAGITA ◽  
Kei OYA ◽  
Hiromichi NAKADATE ◽  
Kota KOIZUMI ◽  
Norimasa NAKAMURA ◽  
...  
Keyword(s):  
Stem Cell ◽  
Cyclic Strain ◽  
Strength Enhancement ◽  
Self Assembled

Photocontrol of Mechanical Properties of Pulp Fibers and Fiber-to-Fiber Bonds via Self-Assembled Polysaccharide Derivatives

2014 ◽  
Vol 300 (3) ◽  
pp. 277-282 ◽  
Author(s):  
Olga Grigoray ◽  
Holger Wondraczek ◽  
Stephan Daus ◽  
Katrin Kühnöl ◽  
Seyed Kourosh Latifi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Pulp Fibers ◽  
Self Assembled ◽  
Polysaccharide Derivatives

scholarly journals Impact of stone ground ‘V-fines’ dispersion and compatibilization on polyethylene wood plastic composites

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6561-6575
Author(s):  
Kirsi Immonen ◽  
Erkki Saharinen ◽  
Ilkka Nurminen ◽  
Jari Sirviö ◽  
David Sandquist
Keyword(s):  
Tensile Strength ◽  
Flexural Strength ◽  
Modulus Of Elasticity ◽  
Negative Impact ◽  
Modulus Of Rupture ◽  
Pulp Fibers ◽  
Mechanical Pulp ◽  
Elongation At Break ◽  
Plastic Composites ◽  
Dispersing Agent

Recent studies have suggested that blocky mechanical pulp fines (CTMP fines) and fibrillar fines (SMC fines) have a negative impact on biocomposite modulus of rupture (MoR) in compression molded biocomposites. In addition, it was suggested that CTMP fines also have a negative impact on biocomposite modulus of elasticity (MoE). This study investigated whether these findings transfer to other types of cellulose fines material and injection molding. The effect of ‘V-fines’ addition to sawdust- and TMP-based biocomposites was analyzed, with respect to fines concentration, dispersing agent, and compatibilizers. The results indicated that the addition of ‘V-fines’ increased the stiffness (MoE) of all the analyzed compositions, while reducing the elongation at break. The addition of ‘V-fines’ reduced the tensile and flexural strength of TMP biocomposites, while it was largely unaffected for sawdust biocomposites. Flexural strength for neat ‘V-fines’ composites showed an increase that was proportional to the remaining pulp fibers composition. The addition of a dispersant agent to the ‘V-fines’ increased tensile strength, suggesting that an increased dispersion of the ‘V-fines’ can be achieved and is beneficial to the composite. The effects of the analyzed compatibilizer (polyethyleneoxide) was negligible, except for a small indication of increased MoE for fines / sawdust biocomposites.

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

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 964-978
Author(s):  
Hae Min Jo ◽  
Ji Young Lee ◽  
Su Ho Kim ◽  
Yeon Hui Lee
Keyword(s):  
Physical Properties ◽  
Kraft Pulp ◽  
Nanofibrillated Cellulose ◽  
Raw Material ◽  
Paper Strength ◽  
Strength Enhancement ◽  
Tensile Index ◽  
Similar Improvement ◽  
Bamboo Pulp ◽  
Enzyme Pretreatment

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.

Preparation of carboxymethyl cellulose from tea stalk and its use as a paper-strengthening agent

2019 ◽  
Vol 34 (3) ◽  
pp. 310-317 ◽  
Author(s):  
Yangyang Zhang ◽  
Yalan Li ◽  
Mengyang Li ◽  
Min Xu ◽  
Jinquan Yue
Keyword(s):  
Response Surface Methodology ◽  
Carboxymethyl Cellulose ◽  
Economic Factors ◽  
Paper Strength ◽  
Effective Factors ◽  
X Ray ◽  
Independent Variables ◽  
Strength Enhancement ◽  
Folding Endurance ◽  
Good Agreement

Abstract Tea stalk was used for producing carboxymethyl cellulose (CMC), and a response surface methodology was used to model effective factors relative to the degree of substitution (DS). The optimum values of the independent variables were an alkalization time of 107 min, monochloroacetic acid at 3.11 g, and an etherification time of 171 min, at which the CMC had a DS of 0.668. The yield of CMC in optimization condition was 75.9 %. The optimized CMC was in a good agreement with the commercial CMC, as based on Fourier transform infrared spectroscopy and X-ray diffractometry analyses. The optimized CMC was used to enhance paper strength, and with economic factors and paper strength enhancement taken into account, the appropriate amount of optimized CMC was determined to be approximately 0.3 %. When the amount of optimized CMC was at 0.3 %, the tensile index, burst index, tearing index, and folding endurance were 26.7 N m/g, 1.0\hspace{0.1667em}\text{kPa}\hspace{0.1667em}{\text{m}^{2}}/\text{g}, 12.1\hspace{0.1667em}\text{mN}\hspace{0.1667em}{\text{m}^{2}}/\text{g}, and 2.0, respectively. Together, these results indicated that the optimized CMC exhibited comparable paper strengthening properties relative to that of commercially available CMC.

Wood Powder Used in Paper Making to Improve Bulkness

2012 ◽  
Vol 550-553 ◽  
pp. 3352-3355
Author(s):  
Dong Mei Yu ◽  
Chuan Shan Zhao ◽  
Chao Jun Wu ◽  
Dai Qi Wang
Keyword(s):  
Wood Powder ◽  
Mechanical Pulp ◽  
Paper Making ◽  
Strength Enhancement

In this paper, we studied the possibility of wood powder in place of mechanical pulp in paper making to get high bulkness, also the dry-bleaching method of wood powder, the strength enhancement and retention effect for wood powder during paper making were all introduced and analyzed in detail.

scholarly journals New Diatomite Filler for Improvement of Paper Strength Properties

2020 ◽  
Vol 71 (5) ◽  
pp. 479-490 ◽  
Author(s):  
Wei Shang ◽  
Haoran Han ◽  
Hunan Liang
Keyword(s):  
Particle Size ◽  
Strength Properties ◽  
Filler Loading ◽  
Sodium Hexametaphosphate ◽  
Paper Strength ◽  
Pulp Fibers ◽  
Cationic Starch ◽  
Coating Method ◽  
Filler Retention ◽  
Modified Diatomite

In this work, diatomite particles were modified to improve the bondability of diatomite particles with pulp fibers and filler retention via a complex of cationic starch-sodium hexametaphosphate coating method. The particle size, FTIR spectroscopy characteristic and morphology of the resulting modified diatomite were studied to confirm the successful modification. The SEM results illustrated that the surface of modified diatomite particles was covered by the complex coatings. The coating efficiency of the complex of cationic starch-sodium hexametaphosphate on diatomite surface was up to 98%. Compared with the handsheet filled unmodified diatomite, the handsheet filled with modified diatomite had higher strength properties and lower bulk. When cationic starch dosage was 7%, and filler dosage was 25% , the resulting tensile strength of filled modified diatomite handsheet was 22.1% higher than the handsheet filled unmodified diatomite. Furthermore, with the filler loading of 30%, compared with that of unmodified diatomite, filler retention of modified diatomite was increased by 20.4%. The larger particle size and higher zeta potential of modified diatomite were benefitial to increase retention of modified diatomite filler.

Modification and Fiber Surface Analyses of Alkaline Peroxide Mechanical Pulp Treated with Laccase

2013 ◽  
Vol 807-809 ◽  
pp. 496-499
Author(s):  
Lu Peng Shao ◽  
Yu Liu ◽  
Zhen Wang ◽  
Jia Chuan Chen
Keyword(s):  
Physical Properties ◽  
Fiber Surface ◽  
Pulp Fibers ◽  
Fiber Morphology ◽  
Mechanical Pulp ◽  
Alkaline Peroxide

This paper compared the differences of laccase modified APMP and unmodified controlled trails to characterize laccase’s impacts on the whiteness, physical properties and fiber morphology of APMP. From this paper, we can see that after laccase modified, the whiteness of the APMP significantly reduced; physical properties of the APMP were reduced after the first enhanced with increasing the amount of laccase. when the amount of laccase was 2u/g, the physical properties of the APMP were best, the same time after 2u/g laccase treatment ,the surfaces of the pulp fibers engendered the devillicate and peeling.

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