Abstract
Pulp was treated with cellulase, and the chemical, physical, and optical properties of the refined pulps in paper sheets were measured in terms of the degree of polymerization of cellulose, tensile strength, elongation, burst strength, light scattering, and brightness. The sheets were thermally treated for 20 and 60 min at 225°C in the presence of 1% and 75% (v/v) water vapor. The cellulase treatment intensified the fibrillation of fibers and reduced the specific energy consumption during refining. It was demonstrated based on the water retention value that the refining modified the water-bonding ability of the pulp fibers, which was further enhanced in the case of cellulase-treated pulps. However, the enzymatic pretreatment impaired the physical properties, such as the tensile strength, elongation, and burst strength of the high-density paper. These changes further reduced the thermal strength stability of the paper. In addition, considerable brightness loss of the cellulase-treated high-density paper was observed compared to the reference paper, indicating more severe thermal degradation reactions as a consequence of enzyme-assisted refining.
Acknowledgments
The Finnish Funding Agency for Technology and Innovation (TEKES) and Metsä Fibre Oy are acknowledged for funding within the EffFibre Program of Finnish Bioeconomy Cluster FIBIC Ltd. Oy Banmark AB is thanked for providing the enzyme for refining. Mr. Esko Pekuri from Metsä Fibre Oy, Kemi mill (Finland) is thanked for viscosity measurements and valuable consulting during the pulp refining. We also thank Dr. Michael Hummel, Dr. Miro Suchy, Dr. Eero Hiltunen, M.Sc. Iina Solala, and M.Sc. Lasse Tolonen for fruitful discussions.
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©2015 by De Gruyter
Articles in the same Issue
- Frontmatter
- Effect of hydroxide and sulfite ion concentration in alkaline sulfite anthraquinone (ASA) pulping – a comparative study
- Novel insight in carbohydrate degradation during alkaline treatment
- Activated hydrogen peroxide decolorization of a model azo dye-colored pulp
- Effects of inorganic salts on the degradation of 2,5-dihydroxy-[1,4]-benzoquinone as a key chromophore in pulps by hydrogen peroxide under basic conditions
- Analysis of degradation products in rayon spinning baths
- Effect of cellulase-assisted refining on the thermal degradation of bleached high-density paper
- Synthesis and characterization of functionalized 4-O-methylglucuronoxylan derivatives
- Hydrophobic materials based on cotton linter cellulose and an epoxy-activated polyester derived from a suberin monomer
- Depolymerization of cellulose during cold acidic chlorite treatment
- Enhanced stability of PVA electrospun fibers in water by adding cellulose nanocrystals
- Micro-nanoparticle gels obtained from bark for their use alone and with chitosan and Na-CMC in paper coatings
- Conversion of sulfur-free black liquor into fuel gas by supercritical water gasification
- Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment
- Preparation of lignin-containing porous microspheres through the copolymerization of lignin acrylate derivatives with styrene and divinylbenzene
- Wood-based activated carbons for supercapacitors with organic electrolyte
- Functionality and physico-chemical characteristics of wheat straw lignin, Biolignin™, derivatives formed in the oxypropylation process
- Antioxidant activity of various lignins and lignin-related phenylpropanoid units with high and low molecular weight
- Characterization of technical lignins by NMR spectroscopy: optimization of functional group analysis by 31P NMR spectroscopy
- Chemical composition of volatiles extracted from indigenous tree species of Uganda: composition of bark extracts from Psorospermum febrifugum and Milicia excelsa
Articles in the same Issue
- Frontmatter
- Effect of hydroxide and sulfite ion concentration in alkaline sulfite anthraquinone (ASA) pulping – a comparative study
- Novel insight in carbohydrate degradation during alkaline treatment
- Activated hydrogen peroxide decolorization of a model azo dye-colored pulp
- Effects of inorganic salts on the degradation of 2,5-dihydroxy-[1,4]-benzoquinone as a key chromophore in pulps by hydrogen peroxide under basic conditions
- Analysis of degradation products in rayon spinning baths
- Effect of cellulase-assisted refining on the thermal degradation of bleached high-density paper
- Synthesis and characterization of functionalized 4-O-methylglucuronoxylan derivatives
- Hydrophobic materials based on cotton linter cellulose and an epoxy-activated polyester derived from a suberin monomer
- Depolymerization of cellulose during cold acidic chlorite treatment
- Enhanced stability of PVA electrospun fibers in water by adding cellulose nanocrystals
- Micro-nanoparticle gels obtained from bark for their use alone and with chitosan and Na-CMC in paper coatings
- Conversion of sulfur-free black liquor into fuel gas by supercritical water gasification
- Modification of acid hydrolysis lignin for value-added applications by micronization followed by hydrothermal alkaline treatment
- Preparation of lignin-containing porous microspheres through the copolymerization of lignin acrylate derivatives with styrene and divinylbenzene
- Wood-based activated carbons for supercapacitors with organic electrolyte
- Functionality and physico-chemical characteristics of wheat straw lignin, Biolignin™, derivatives formed in the oxypropylation process
- Antioxidant activity of various lignins and lignin-related phenylpropanoid units with high and low molecular weight
- Characterization of technical lignins by NMR spectroscopy: optimization of functional group analysis by 31P NMR spectroscopy
- Chemical composition of volatiles extracted from indigenous tree species of Uganda: composition of bark extracts from Psorospermum febrifugum and Milicia excelsa