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Sökning: WFRF:(Backstrom Marie)

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1.
  • Backstrom, Marie, et al. (författare)
  • Influence of chip presteaming conditions on kraft pulp composition and properties
  • 2016
  • Ingår i: Holzforschung. - : Walter de Gruyter. - 0018-3830 .- 1437-434X. ; 70:5, s. 393-399
  • Tidskriftsartikel (refereegranskat)abstract
    • Presteaming is a well-established technique in pulp mills, which improves cooking liquor impregnation by removing air from within and between chips. The aim of the study was to investigate how conditions during steaming affect the subsequent kraft cook and properties of the obtained pulp. It was found that higher pressure and temperature during chip presteaming led to increased degradation and dissolution of hemicelluloses. Lower refinability and tensile index was obtained for pulps cooked after presteaming at high pressure and for a long time.
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2.
  • Tormund, Disa, et al. (författare)
  • Delignification and bleaching response of earlywood and latewood
  • 2006
  • Ingår i: Journal of wood chemistry and technology. - : Informa UK Limited. - 0277-3813 .- 1532-2319. ; 26:4, s. 325-337
  • Tidskriftsartikel (refereegranskat)abstract
    • The delignification response in cooking and the impact of bleaching on earlywood and latewood were studied. Spruce earlywood and latewood chips were pulped by the kraft process and subsequently treated with one bleaching chemical at a time. In cooking, latewood required a higher alkali charge to reach the same kappa number. No difference in the light absorption coefficient between the different fiber types was observed. After oxygen delignification the earlywood fibers had a higher light absorption coefficient at the same kappa number. The difference in light absorbing material was maintained when bleaching was performed with chlorine dioxide, ozone, and peracetic acid. Hydrogen peroxide decreased the light absorbing structures in the earlywood to the same level as for latewood. The earlywood pulp had a higher brightness at a given kappa number than the latewood. The higher brightness remained through all bleaching operations and was primarily due to a higher light scattering ability.
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  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
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refereegranskat (2)
Författare/redaktör
Backstrom, Marie (2)
Brännvall, Elisabet (2)
Jensen, Anna (1)
Tormund, Disa (1)
Olm, Leelo (1)
Lärosäte
Kungliga Tekniska Högskolan (2)
RISE (1)
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Engelska (2)
Forskningsämne (UKÄ/SCB)
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