Characterization of wood fibers using fiber property distributions

Pulkkinen, Iiro; Ala-Kaila, Kari; Aittamaa, Juhani

doi:10.1016/j.cep.2005.12.003

Cited by 29 publications

(22 citation statements)

References 5 publications

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“…Although the enzyme was more functional at values greater than 60 min, exhibited by a 22.57% decrease in Kappa number and a 36.51% increase in residual alkali at 100 min, the extension of treatment time did not clearly improve the brightness, pulp yield, or the physical properties of the handsheets. These results are similar to the findings of Garmaroody and Pulkkinen (Pulkkinen et al 2006;Garmaroody et al 2011). In consequence, the optimal time for pectinase pretreatment was determined to be 60 min.…”

Section: Optimization Of Enzymatic Treatment Processsupporting

confidence: 81%

Effect of Alkali Pectinase Pretreatment on Bagasse Soda-Anthraquinone Pulp

Liu¹,

Jiang²,

Xie³

et al. 2017

BioResources

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Pectinase pretreatment prior to bagasse soda-anthraquinone (AQ) pulping was conducted, and the effects of pectinase pretreatment on the pulp strength properties, energy consumption, and pulpability were evaluated in this study. Considering the pulp properties, the optimal conditions for the pectinase pretreatment were a pectinase dosage of 60 U/g (with respect to oven-dry bagasse) and 60-min treatment time. Compared with the control pulps obtained under the same treatment conditions with enzyme pretreatment (just without enzyme addition), the pretreated pulps attained a reduction in kappa number of 17.8% and an increase in total pulp yield of 15.8%. Moreover, higher breaking length, burst factor, and tear factor after soda-AQ pulping were found in the pectinase-pretreated samples, which suggests some improvements in pulp strength properties. With pectinase treatment, a 1% reduction in alkali charge and 20% decrease in pulping time were observed in subsequent pulping stages without affecting the pulp properties. Pectinase treatment prior to pulping seems to be a promising, economically feasible, and eco-friendly concept.

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Section: Optimization Of Enzymatic Treatment Processsupporting

confidence: 81%

Effect of Alkali Pectinase Pretreatment on Bagasse Soda-Anthraquinone Pulp

Liu¹,

Jiang²,

Xie³

et al. 2017

BioResources

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“…To better envisage differences in refining, fibre length as determined in accordance with Tappi 271 was plotted as weighted length distribution (Figure 2) to partially exclude the influence of fines and short fibres on the results of the fibre length analysis. 34 Such an analysis allowed us to elucidate the effect of Cel9B and its truncated form GH9-CBD3c on pulp refining at 1,500 and 3,000 rev. The curves for Cel9B testify to the efficiency of this enzyme in hydrolysing cellulose fibres.…”

Section: Resultsmentioning

confidence: 99%

Use of cellulases and recombinant cellulose binding domains for refining TCF kraft pulp

Cadena

Chriac

Pastor

et al. 2010

Biotechnology Progress

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The modular endoglucanase Cel9B from Paenibacillus barcinonensis is a highly efficient biocatalyst, which expedites pulp refining and reduces the associated energy costs as a result. In this work, we set out to identify the specific structural domain or domains responsible for the action of this enzyme on cellulose fibre surfaces with a view to facilitating the development of new cellulases for optimum biorefining. Using the recombinant enzymes GH9-CBD3c, Fn3-CBD3b, and CBD3b, which are truncated forms of Cel9B, allowed us to assess the individual effects of the catalytic, cellulose binding, and fibronectin-like domains of the enzyme on the refining of TCF kraft pulp from Eucalyptus globulus. Based on the physico-mechanical properties obtained, the truncated form containing the catalytic domain (GH9-CBD3c) has a strong effect on fibre morphology. Comparing its effect with that of the whole cellulase (Cel9B) revealed that the truncated enzyme contributes to increasing paper strength through improved tensile strength and burst strength and also that the truncated form is more effective than the whole enzyme in improving tear resistance. Therefore, the catalytic domain of Cel9B has biorefining action on pulp. Although cellulose binding domains (CBDs) are less efficient toward pulp refining, evidence obtained in this work suggests that CBD3b alters fibre surfaces and influences paper properties as a result.

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“…The lower level of fine fraction in fungi pre-treated pulp samples, and consequent higher percent of long fiber fraction at almost constant level of medium fiber fraction may be explained by partial elimination of these primary fines during fungi pre-treatment. Lower fine fraction and higher percent of flexible fiber with more collapsibility in fungi pretreated kraft pulp may produce a paper with improved quality (Pulkkinen et al, 2006;Vicentim et al, 2009;Masarin et al, 2009). …”

Section: Fiber Classificationmentioning

confidence: 97%

“…As an example, the strength of paper is greatly affected by its fiber length, while fiber width and wall thickness, on the other hand, affect fiber flexibility and their tendency to collapse, which in addition to strength affect, for instance, caliper, density, and porosity of paper. It is, therefore, important in terms of final paper quality and production costs that the interactions between fiber properties and paper characteristics are well understood and are efficiently characterized (Seth, 2000;Paavilainen, 1993;Kibblewhite et al, 1995;McIntosh, 1967;Pulkkinen et al, 2006). In addition, by measuring fiber characteristics, the paper makers are able to troubleshoot the process and determine the parts causing the most fiber damages (Pulkkinen et al, 2006).…”

Section: Introductionmentioning

confidence: 98%

“…They are valuable tools in evaluation of the fiber potentials, and can be used as fast and reliable instruments to monitor on-line pulp quality as well as in laboratory researches. Morphological properties, such as fiber length and wall thickness, can be quickly and readily measured by optical analyzers that utilize image capturing of each fiber coupled with image analysis or related methods (Pulkkinen et al, 2006, Madakadze et al, 1999, Nazhad et al, 1995.…”

Section: Introductionmentioning

confidence: 99%

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