Results 171 to 180 of about 1,867 (190)

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

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

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

Effect of the counterion on the beatability of unbleached kraft pulps

Nordic Pulp & Paper Research Journal, 2000
The objective of this investigation was to demonstrate the effect of the counterion on the energy consumption during a beating process and on the resulting strength properties of handsheets.
Lars-Åke Hammar, Marie Bäckström, Myat Htun   +2 more
openaire   +1 more source

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

Evaluation of fines separation from unbleached softwood kraft pulp using microperforated hole screens

Nordic Pulp & Paper Research Journal, 2021
AbstractThe application of a bench scale and an industrial scale pressure screen to separate cellulosic fines from an unbleached softwood kraft pulp containing 5 % (w/w) primary fines was investigated and the results were compared. In the bench scale trials different microperforated screens with hole diameters of 150 µm, 250 µm, 400 µm and 600 µm were ...
D. Mandlez, R. Eckhart, W. Bauer
openaire   +1 more source

Characterization of Unbleached Kraft Pulps by Enzymatic Treatment, Potentiometric Titration and Polyelectrolyte Adsorption

hfsg, 1996
The surface properties of unbleached softwood (Pinus sylvestris) and hardwood (Betula verrucosa) kraft pulps were modified by treating the fibre surfaces with specific xylanase and mannanase (Trichoderma reesei). The amounts and accessibilities of surface carboxyl groups in untreated and enzyme-treated fibres were analyzed using adsorption of cationic ...
Buchert, Johanna, Viikari, Liisa, Stenius, Per, Laine, Janne   +4 more
openaire   +1 more source

Characterization of Residual Lignins Isolated from Unbleached and Semibleached Softwood Kraft Pulps

Journal of Wood Chemistry and Technology, 1987
Abstract Residual lignins in an unbleached and a semibleached softwood (Pinus taeda L.) kraft pulp were isolated by enzymatic hydrolysis of polysaccharides in the pulps. After purification, the residual lignins were characterized. A dissolved lignin was also isolated from the alkaline extraction spent liquor by acidification and characterized.
Jian-Er Jiang, Hou-Min Chang, Shyam S. Bhattacharjee, David L. W. Kwoh   +3 more
openaire   +1 more source

Characterisation of fines from unbleached kraft pulps and their impact on sheet properties

hfsg, 2008
Abstract Fines are an essential component in the papermaking process because they have a profound influence on the behaviour of the wet web and on the mechanical properties of the final sheet. Primary fines are present in the pulp prior to refining, and secondary fines are produced during refining.
Marie Bäckström, Marie-Claude Kolar, Myat Htun   +2 more
openaire   +1 more source

Cellulose nanofiber extraction from unbleached kraft pulp for paper strengthening

Cellulose, 2023
Yali Liu, Sufeng Zhang, Lei Li, Sergiu Coseri   +3 more
openaire   +1 more source