A1 Journal article (refereed), original research

Characteristics of prehydrolysis-kraft pulp fibers from Scots pine

LUT Authors / Editors

Publication Details
Authors: Saukkonen Esa, Kautto Jesse, Rauvanto Irina, Backfolk Kaj
Publisher: De Gruyter
Publication year: 2012
Language: English
Related Journal or Series Information: Holzforschung
Volume number: 66
Issue number: 7
ISSN: 0018-3830
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication


To clarify the influence of prehydrolysis on fiber characteristics, Scots pine (Pinus sylvestris L.) wood chips were subjected to pressurized hot-water and dilute-acid prehydrolysis (0.5% H2SO4) prior to kraft pulping to partially remove hemicellulosic sugars as hydrolyzate. After the prehydrolysis, the wood chips were cooked by the kraft process and fully bleached in a (O)DED-sequence. Measurements with an automated optical fiber analyzer showed that prehydrolysis prior to kraft pulping caused significant changes in the fiber dimensions and morphology of the final bleached pulp. Especially, a decrease in fiber width and an increase in fiber deformations were observed compared to a reference kraft pulp. The scanning electron microscopy of handsheets supported the morphology analyses and revealed alterations also in the fiber ultrastructure. The changes in both chemical and physical fiber characteristics require attention when considering the correct processing and end-use of prehydrolysis-kraft pulp fibers.

Last updated on 2017-06-06 at 13:04