Applying a novel cooking technique to produce high kappa number pulps: the effects on physical properties
2009 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 24, no 4, 415-420 p.Article in journal (Refereed) Published
A recently developed kraft cooking technique, with a longer impregnation time at lower temperatures to facilitate diffusion over consumption of active cooking chemicals, makes it possible to produce kraftliner pulp without inline refining. This technique was applied to prepare two pulps with different lignin contents, which were compared with two industrial pulps from conventional kraft cooks in order to evaluate the physical properties of the pulps.
It was demonstrated that pulps with lower lignin content can increase tensile stiffness, decrease hygroexpansion, and decrease the mechano-sorptive creep of handsheets. However, no difference in SCT and tensile energy absorption values due to different lignin contents was observed. It was further demonstrated that pulps made with Extended Impregnation Cooking (EIC) results in straighter pulp fibres with higher cellulose content. These pulps tended to have lower mechano-sorptive creep than conventional pulps. A higher brightness of the pulp sheets can also be obtained by choosing a higher alkali profile.
Place, publisher, year, edition, pages
2009. Vol. 24, no 4, 415-420 p.
High kappa number pulp, Extended impregnation, Softwood, Mechano-sorptive creep, Hygroexpansion, Tensile properties
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-11718ISI: 000273724200007ScopusID: 2-s2.0-76349088958OAI: oai:DiVA.org:kth-11718DiVA: diva2:280042
QC 201006292009-12-082009-12-082010-07-06Bibliographically approved