Surface selective removal of xylan from refined never-dried birch kraft pulp

Saukkonen, Esa; Lyytikäinen, Katja; Geydt, Pavel; Backfolk, Kaj

doi:10.1007/s10570-014-0354-8

Cited by 4 publications

(4 citation statements)

References 58 publications

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“…However, pulp pretreatment with preparations of xylanases that display the relatively high cellulolytic activity negatively affected the dynamic strength properties that was correlated with a significant decrease in the mean weighted fibre length, which was greater than in the studies of Chen et al (2012) and Saukkonen et al (2014), and nearly the same as reported by Derkowska (2015) and Borkowski (2015). Also Znidarsic-Plazl et al (2009) observed the improvement of paper strength properties while Saukkonen et al (2014) reported only slight differences in paper properties (changes in the indices by only several %). This study showed that these differences (an increase in tensile index and a decrease in tear index) reach even 20%.…”

Section: Discussionsupporting

confidence: 49%

Effect of xylanases on refining process and kraft pulp properties

et al. 2017

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Results of this study demonstrate that enzymatic pretreatment of pulps enables energy savings in the refining process. Pretreatments of NBSK pulp with 3 different commercial xylanases resulted in a faster increase in the pulp freeness that reduced energy input for refining. The partial xylan removal by these enzymes affected the properties of cellulosic pulp and paper. The tensile properties of paper were improved by pretreatment with a pure xylanase while the additional activity of cellulases in the other two tested enzymes negatively influenced the tear resistance. Only the pure xylanase improved the pulp and paper properties. The results of this study provide evidence that the purity of xylanases used in papermaking is of great importance and may decide of paper quality and production costs.

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Section: Discussionsupporting

confidence: 49%

Effect of xylanases on refining process and kraft pulp properties

et al. 2017

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“…Another important aspect regarding the behaviour of the fibres is the presence of hemicelluloses on the surface that can influence strength, bonding potential and hornification properties [ 235 ]. These can be selectively removed by chemical or enzymatic treatments.…”

Section: Fibre Extraction Process and Related Physical Propertiesmentioning

confidence: 99%

“…The most common chemical treatments of fibres, improving the WPC performance, involve silane [ 290 , 291 ], maleic anhydride [ 292 , 293 , 294 , 295 ], mercerization [ 296 , 297 , 298 ] and acetylation [ 9 , 299 , 300 ]. To make the fibre more hydrophobic, several other types of treatment, such as permanganate [ 301 ], acrylation [ 302 ], isocyanate [ 303 ], benzoylation, fatty acid derivation (oleoyl chloride), enzymatic [ 235 , 304 ], fluorination [ 305 ], octadecylamine [ 306 ], PEI (polyethylene imine), CaCl 2 and Ca(OH) 2 have also been investigated. Some physical methods involving treatment by plasma [ 307 ], heat, corona, laser or γ-ray [ 308 , 309 ] have also been used and impact positively on the mechanical properties, such as stiffness, of the WPC.…”

Section: Fibre Improvementmentioning

confidence: 99%

Plant Fibre: Molecular Structure and Biomechanical Properties, of a Complex Living Material, Influencing Its Deconstruction towards a Biobased Composite

et al. 2016

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Plant cell walls form an organic complex composite material that fulfils various functions. The hierarchical structure of this material is generated from the integration of its elementary components. This review provides an overview of wood as a composite material followed by its deconstruction into fibres that can then be incorporated into biobased composites. Firstly, the fibres are defined, and their various origins are discussed. Then, the organisation of cell walls and their components are described. The emphasis is on the molecular interactions of the cellulose microfibrils, lignin and hemicelluloses in planta. Hemicelluloses of diverse species and cell walls are described. Details of their organisation in the primary cell wall are provided, as understanding of the role of hemicellulose has recently evolved and is likely to affect our perception and future study of their secondary cell wall homologs. The importance of the presence of water on wood mechanical properties is also discussed. These sections provide the basis for understanding the molecular arrangements and interactions of the components and how they influence changes in fibre properties once isolated. A range of pulping processes can be used to individualise wood fibres, but these can cause damage to the fibres. Therefore, issues relating to fibre production are discussed along with the dispersion of wood fibres during extrusion. The final section explores various ways to improve fibres obtained from wood.

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“…There is evidence that a combination of a higher beating degree and an enzymatic treatment with xylanase may increase paper elongation (Fillinger 2016). However, xylanase treatment has no influence on paper elongation if measurement is done using a tensile tester (Saukkonen et al 2014), which suggests that the role of mechanical treatment of fibers is dominant. This conclusion is supported by the work of Seth (2005), who proposed two production-related factors that can be used to control sheet extensibility: mechanical treatment of the fibers and degree of sheet shrinkage during drying, although the properties of the single fibers are emphasized after sufficient bonding is achieved.…”

Section: Introductionmentioning

confidence: 99%

Influence of pulp type on the three-dimensional thermomechanical convertibility of paperboard

et al. 2019

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This study examines the effect of pulp type on the formability and elongation of paperboard, which are of key importance when producing 3D packages. Material performance was studied with a press-forming machine using laboratory handsheets as substrates. The handsheets were prepared from bleached softwood and hardwood kraft pulps, chemithermomechanical pulp, recycled newsprint, and mixtures of birch kraft and other pulps. The effect of microfibrillated cellulose (MFC) on substrate properties and material formability was also investigated. The 3D elongation of MFC-free handsheets varied between 1.2 and 5.5%. Depending on the pulp type and sheet composition, three essential sheet properties were recognized. These properties were bulk, elastic modulus and bending stiffness, the first two of which

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Surface selective removal of xylan from refined never-dried birch kraft pulp

Cited by 4 publications

References 58 publications

Effect of xylanases on refining process and kraft pulp properties

Effect of xylanases on refining process and kraft pulp properties

Plant Fibre: Molecular Structure and Biomechanical Properties, of a Complex Living Material, Influencing Its Deconstruction towards a Biobased Composite

Influence of pulp type on the three-dimensional thermomechanical convertibility of paperboard

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