Results 161 to 170 of about 588 (182)

Wet strength improvement of unbleached kraft pulp through laccase catalyzed oxidation

Enzyme and Microbial Technology, 2001
Previous investigations have shown that laccase catalyzed oxidation of lignin containing wood fibers can enhance the strength of medium density fiberboards. In the present work it was investigated if laccase treatment had any impact on the tensile strength of a high yield unbleached kraft pulp. Treatment with laccase alone had only a very little effect
Lund, M., Felby, C.
openaire   +2 more sources

Recycling performance of softwood and hardwood unbleached kraft pulps for packaging papers

TAPPI Journal, 2023
The scope of this work is to evaluate the recyclability potential of hardwood and softwood unbleached kraft pulps, leading to a sound basis for comparison and even to support a decision about fibers according to the performance achieved. The influence of successive recycling cycles (up to 10 cycles) on the fiber morphology, pulp suspension drainability,
Rogério M.S. Simões, Catarina I.A. Ferreira, FIlipa Pires, Margarida Martins, Ana Ramos, António P.M. Sousa, Paula C.R. Pinto, Ricardo Jorge   +7 more
openaire   +1 more source

Binding affinities of different metal ions to unbleached hardwood kraft pulp

Holzforschung, 2011
No abstract ...
Pingping Su, Kim Granholm, Leo Harju, Ari Ivaska   +3 more
openaire   +1 more source

High Temperature Leaching of Lignin From Unbleached Kraft Pulp Fibers

Journal of Wood Chemistry and Technology, 1983
Abstract When an unbleached kraft pulp was suspended in water at various temperatures between 20°C and 90°C the rate of the leaching of lignin from the fiber wall increased with the temperature. From 20°C to 70°C, the change in the intrafiber diffusion coefficient with temperature varied directly as the ratio of the absolute temperature to the ...
B. D. Favis, J. M. Willis, D. A. I. Goring   +2 more
openaire   +1 more source

Effect of Xylanase and Dosage on the Refining Properties of Unbleached Softwood Kraft Pulp

Journal of Wood Chemistry and Technology, 1999
Two xylanase preparations were compared at different doses for their abilities to enhance the refining properties of a never-dried, unbleached kraft pulp derived from radiata pine. These enzymes varied in their ability to solubilise xylan from pulp, and the selective removal of pulp xylan did not reduce intrinsic fibre strength.
Ken K.Y. Wong, R. Paul Kibblewhite, Frances A. Signal   +2 more
openaire   +1 more source

The Effect of Electrolytes on the Leaching of Lignin From Unbleached Kraft Pulp Fibers

Journal of Wood Chemistry and Technology, 1983
Abstract When an unbleached kraft pulp is suspended in aqueous solutions of electrolytes, the rate of leaching of lignin from the fiber wall is found to decrease with an increase in the ionic strength of the electrolyte. The effect was found to be greater with divalent ions (Mg++, Ca++, Zn++) than with a monovalent ion, Na+.
B. D. Favis, J. M. Willis, D. A. I. Goring   +2 more
openaire   +1 more source

Residual Lignin in Uneleached Kraft Pulp. Part I.: -Allkalli-Extraction of Residual Lignin from Unbleached Kraft Pulp Solution-

Journal of Wood Chemistry and Technology, 1987
Abstract Unbleached kraft pulp containing 4.7% Klason lignin has been found to dissolve completely in several nonaqueous cellulose solvents. Extraction of the residual lignin in the unbleached kraft pulp from these solutions was attempted using several kinds of solvents for kraft lignin and hemicellulcoes.
Akira Isogai, Atsushi Ishizu, Junzo Nakano   +2 more
openaire   +1 more source

Tailoring cellulose-based hydrogels by phosphorylation of unbleached kraft pulps for adsorption applications

Cellulose
Industrialization and human activities have exacerbated water pollution, demanding effective pollutant removal methods. Bio-based hydrogels, with their high porosity and extensive surface area, hold promise for this purpose.
Isabel Carrillo-Varela, Milenka Albornoz, Isidora Reyes-González, María Graciela Aguayo, Elizabeth Elgueta, Pablo Reyes-Contreras, Miguel Pereira, Regis Teixeira Mendonça   +7 more
openaire   +2 more sources

Molecular Weight of Lignin Fractions Leached from Unbleached Kraft Pulp Fibers

Journal of Wood Chemistry and Technology, 1984
Abstract The molecular weights of lignin fractions leached from an unbleached kraft pulp were found to increase from 230,000 to 410,000 as washing of the pulp proceeded. The free diffusion coefficients for both a spherical and a disk-like conformation were calculated and were found to be seven orders of magnitude higher than the observed intrafiber ...
B. D. Favis, W. Q. Yean, D. A. I. Goring
openaire   +1 more source

Chemical characterization of the surface layers of unbleached pine and birch kraft pulp fibres

Journal of Pulp and Paper Science, 1996
The content of wood polymers in different morphological parts of unbleached pine and birch kraft pulp was studied using a mechanical peeling technique. The relative distribution of hemicelluloses and cellulose in the surface material of the pine kraft fibres was similar to that in the whole fibres.
Suurnäkki, Anna, Heijnesson, Anette, Buchert, Johanna, Viikari, Liisa, Westermark, Ulla   +5 more
openaire   +3 more sources