Separate bleaching of pulp fractions enriched in earlywood and latewood fibers
2007 (English)In: Journal of wood chemistry and technology, ISSN 0277-3813, E-ISSN 1532-2319, Vol. 27, no 2, 99-112 p.Article in journal (Refereed) Published
Unbleached softwood kraft pulp was fractionated in hydrocyclones into a fine fraction, enriched in earlywood fibers, and a coarse fraction, enriched in latewood fibers. The response to individual bleaching chemicals and the bleachability in bleaching sequences of the pulp fractions was studied. The light absorption coefficient, light scattering coeffient, and brightness were higher in the unbleached fine fraction than in the coarse fraction. Hydrogen peroxide managed to reduce the light absorption coefficient of the earlywood enriched fine fraction more efficiently than that of the latewood enriched fraction. In the TCF-sequence the light absorption coefficient of the fine fraction was reduced to the level of the coarse fraction at a given consumption of bleaching chemicals. In the ECF-sequence the difference in light absorption coefficient remained between the fractions. At a given consumption of bleaching chemicals, the fine fraction had higher brightness than the coarse fraction, 2%- and 1%-units on the ISO-scale in the TCF and ECF bleaching sequence, respectively.
Place, publisher, year, edition, pages
2007. Vol. 27, no 2, 99-112 p.
softwood, bleaching response, latewood fibers, earlywood fibers, hydrocyclone, fractionation, loblolly-pine, paper
IdentifiersURN: urn:nbn:se:kth:diva-16900DOI: 10.1080/02773810701486881ISI: 000249015000005ScopusID: 2-s2.0-35348984061OAI: oai:DiVA.org:kth-16900DiVA: diva2:334943
QC 201005252010-08-052010-08-05Bibliographically approved