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Journal articles
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Open Access
Colloid chemical aspects of paper formation in the presence of nanofibrillated cellulose and cationic starch, TAPPI Journal September 2024

ABSTRACT: A series of experimental tests were carried out to examine colloidal-scale consequences of optionally treating nanofibrillated cellulose (NFC) with cationic starches of different charge density and dosage (0.5% or 2.0% by weight), adding that material to a furnish prepared from 100% recycled copy paper, and then subjecting the mixture to very different levels of hydrodynamic shear. Tests included optical microscopy, sediment volume tests, sediment velocity tests, and “percent fines” assessment by means of a fiber quality analyzer (FQA). In addition, the zeta potential and charge demand of the studied materials were evaluated. Optical imaging revealed that cationic starch treatment of the NFC tended to agglomerate it into multiparticle clusters, which sometimes could be mostly redispersed by hydrodynamic shear. Subsequent addition of the starch-treated NFC to the default furnish resulted in much of the colloidal material becoming attached to fibers. Subsequent shearing of the mixtures was at least partly effective in separating the clusters of NFC from the fiber surface, resulting in essentially a two-component mixture. Multiparticle NFC clusters coexisted with the fiber suspension, sometimes attached and sometimes not, depending on the details of treatments. Sediment volume tests showed that systems containing cationic starch-treated NFC tended to have a higher density after settling in comparison to untreated NFC; these findings are consistent with the cationic starch acting as a stabilizer on the solid surfaces, allowing them to slide past each other during the settling process. Application of intense hydrodynamic shear tended to result in denser sediment. Results of tests with the sediment velocity messurement and the FQA percent fines assessment did not correlate well with changes in test conditions considered in this study.

Journal articles
Open Access
Cavitation-jet deinking: A new technology for deinking of recovered paper, TAPPI JOURNAL September 2014

Cavitation-jet deinking: A new technology for deinking of recovered paper, TAPPI JOURNAL September 2014

Journal articles
Open Access
Editorial: TAPPI JOURNAL 2014 Best Research Paper Award highlights potential of cavitation-jet deinking, TAPPI JOURNAL April 2015

Editorial: TAPPI JOURNAL 2014 Best Research Paper Award highlights potential of cavitation-jet deinking, TAPPI JOURNAL April 2015

Journal articles
Open Access
Organic material dissolved during oxygen-alkali pulping of hot water-extracted birch sawdust 15APR237

Organic material dissolved during oxygen-alkali pulping of hot water-extracted birch sawdust, TAPPI JOURNAL April 2015

Journal articles
Magazine articles
Open Access
Editorial: In praise of challenging papers

Editorial: In praise of challenging papers, and those who review them, TAPPI JOURNAL August 2015

Journal articles
Open Access
Systematic screening of biorefinery technologies at the early stage of design, TAPPI JOURNAL October 2012

Systematic screening of biorefinery technologies at the early stage of design, TAPPI JOURNAL October 2012

Journal articles
Open Access
Semi-bleached paper and fermentation products from a larch biorefinery, TAPPI JOURNAL October 2012

Semi-bleached paper and fermentation products from a larch biorefinery, TAPPI JOURNAL October 2012

Journal articles
Open Access
Effect of commercial xylanases applied at extreme conditions in a eucalyptus pulp mill, TAPPI JOURNAL October 2012

Effect of commercial xylanases applied at extreme conditions in a eucalyptus pulp mill, TAPPI JOURNAL October 2012

Journal articles
Magazine articles
Open Access
Generlized stead-state model for chlorine dioxide brightning

Generlized stead-state model for chlorine dioxide brightning of hardwood kraft pulps, TAPPI JOURNAL May 2017

Journal articles
Magazine articles
Open Access
Impact of dissolved matter in the oxygen delignifcation stag

Impact of dissolved matter in the oxygen delignifcation stage, TAPPI JOURNAL May 2017

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