Results 141 to 150 of about 588 (182)

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

Holzforschung, 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.
Myat Htun
exaly   +3 more sources

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Determination of fiber charge components of Lo-Solids unbleached kraft pulps

Journal of Colloid and Interface Science, 2004
Four different titration methods for measurement of fiber charge were used in this study. Each method gave different fiber charge values depending on the acidity of the end point and the interaction between the fiber chemical components and the titrant.
Nishi K Bhardwaj, Kien L Nguyen
exaly   +3 more sources

Variation of Phenolic Hydroxyl Contents in Unbleached Kraft Pulps

Holzforschung, 1995
The content of phenolic hydroxyl groups in the unbleached kraft pulp residual lignin was determined in situ by periodate oxidation method. This functional group has been shown to increase steadily with the extent of kraft delignification throughout the entire pulping process.
Yuan-Zong Lai, Sung Phil Mun
exaly   +2 more sources

Surface characterization of unbleached kraft pulps by means of ESCA

Cellulose, 1994
The effect of digestion conditions (amount of effective alkali, digestion time) on the surface compositions of unbleached softwood (Pinus sylvestris) kraft pulp has been investigated by electron spectroscopy for chemical analysis (ESCA). The quantities monitored were the angular dependence of the total O/C ratio, the relative amounts of carbons in ...
Janne Laine, Per Stenius, Gilbert Carlsson, G�ran Str�m   +3 more
openaire   +2 more sources

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

Holzforschung, 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 ...
Janne Laine, Johanna Buchert, Liisa Viikari   +2 more
exaly   +2 more sources

The influence of pulping and washing conditions on the properties of Eucalyptus grandis unbleached kraft pulps treated with chelants

Bioresource Technology, 2010
The influence of different addition points of a chelating agent and a counter-ion exchange on the properties of Eucalyptus grandis unbleached kraft pulps is studied. Seven pulps were considered: two laboratory kraft pulps with or without the inclusion of the chelant DTPMPA (diethylene triamine penta (methylene phosphonic acid)), a mill kraft pulp and ...
Maria Cristina Area, M Graça V S Carvalho, Paula Ferreira   +2 more
exaly   +3 more sources

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.
Hou-Min Chang
exaly   +2 more sources

Effect of electrolyte concentration and pH on the beatability of unbleached kraft pulps

Nordic Pulp and Paper Research Journal, 2000
Myat Htun
exaly   +2 more sources

Reflectance FTIR Microspectroscopy for Studying Effect of Xylan Removal on Unbleached and Bleached Birch Kraft Pulps

Holzforschung, 2002
The effect of the partial removal of xylan on unbleached and bleached birch kraft pulps was investigated by Fourier transform infrared (FTIR) microspectroscopy and the resulting data were analyzed by multivariate data analysis, i.e., principal component ...
R Alen
exaly   +2 more sources

Residual Lignin in Unbleached Kraft Pulp. Part 2. -Analysis of Unbleached Kraft Pulp by New Permethylation Method-

Journal of Wood Chemistry and Technology, 1987
Abstract Unbleached kraft pulp (UKP), its residue after extraction with concentrated alkali (α-UKP), bleached kraft pulp prepared from UKP (BKP) and its residue after extraction with concentrated alkali (α-BKP) were permethylated with powdered NaOH and CH3I in their SO2-diethylamine (DEA)-dimethylsufoxide (DMSO) solutions.
Akira Isogai, Atsushi Ishizu, Junzo Nakano   +2 more
openaire   +1 more source