Separate bleaching of pulp fractions enriched in earlywood and latewood fibers

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Fältnamn	Indikatorer	Metadata
000		02535naa a2200409 4500
001		oai:DiVA.org:kth-16900
003		SwePub
008		100805s2007 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-169002 URI
024	7	a https://doi.org/10.1080/027738107014868812 DOI
040		a (SwePub)kth
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Brännvall, Elisabetu KTH,Fiber- och polymerteknologi4 aut0 (Swepub:kth)u1bug0dr
245	1 0	a Separate bleaching of pulp fractions enriched in earlywood and latewood fibers
264	1	b Informa UK Limited,c 2007
338		a print2 rdacarrier
500		a QC 20100525
520		a 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.
653		a softwood
653		a bleaching response
653		a latewood fibers
653		a earlywood fibers
653		a hydrocyclone
653		a fractionation
653		a loblolly-pine
653		a paper
700	1	a Tormund, Disa4 aut
700	1	a Bakkstrom, Marie4 aut
700	1	a Bergstrom, Jonas4 aut
700	1	a Tubek-Lindblom, Anna4 aut
710	2	a KTHb Fiber- och polymerteknologi4 org
773	0	t Journal of wood chemistry and technologyd : Informa UK Limitedg 27:2, s. 99-112q 27:2<99-112x 0277-3813x 1532-2319
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-16900
856	4 8	u https://doi.org/10.1080/02773810701486881

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Journal of wood chemistry and technology (Sök värdpublikationen i LIBRIS)

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Av författaren/redakt...: Brännvall, Elisa ...; Tormund, Disa; Bakkstrom, Marie; Bergstrom, Jonas; Tubek-Lindblom, ...

Artiklar i publikationen: Journal of wood ...

Av lärosätet: Kungliga Tekniska Högskolan

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