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Magazine articles
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.
Magazine articles
Diverse program offered at annual coating and graphic arts division conference, TAPPI JOURNAL, August 1993, Vol. 76(8)
Diverse program offered at annual coating and graphic arts division conference, TAPPI JOURNAL, August 1993, Vol. 76(8)
Magazine articles
Unbleached denim finds new life in 'blue jean' paper products, TAPPI JOURNAL, December 1993, Vol. 76(12)
Unbleached denim finds new life in 'blue jean' paper products, TAPPI JOURNAL, December 1993, Vol. 76(12)
Magazine articles
Floor tube corrosion in recovery boilers, TAPPI JOURNAL, December 1993, Vol. 76(12)
Floor tube corrosion in recovery boilers, TAPPI JOURNAL, December 1993, Vol. 76(12)
Magazine articles
Forklift emissions - some solutions, TAPPI JOURNAL, December 1993, Vol. 76(12)
Forklift emissions - some solutions, TAPPI JOURNAL, December 1993, Vol. 76(12)
Magazine articles
1992 finishing and converting conference, TAPPI JOURNAL, February 1993, Vol. 76(2)
1992 finishing and converting conference, TAPPI JOURNAL, February 1993, Vol. 76(2)
Magazine articles
More than 420 attend polymers, laminations and coatings division annual conference, TAPPI JOURNAL, January 1993, Vol. 76(1)
More than 420 attend polymers, laminations and coatings division annual conference, TAPPI JOURNAL, January 1993, Vol. 76(1)
Magazine articles
Papermakers conference draws more than 900 attendees, TAPPI JOURNAL, July 1993, Vol. 76(7)
Papermakers conference draws more than 900 attendees, TAPPI JOURNAL, July 1993, Vol. 76(7)
Magazine articles
Sixth international printing and graphic arts conference, TAPPI JOURNAL, May 1993, Vol. 76(5)
Sixth international printing and graphic arts conference, TAPPI JOURNAL, May 1993, Vol. 76(5)
Magazine articles
Corrosion-assisted cracking of duplex stainless Steels sn suction Roll applications, TAPPI JOURNAL, August 1994, Vol. 77(8)
Corrosion-assisted cracking of duplex stainless Steels sn suction Roll applications, TAPPI JOURNAL, August 1994, Vol. 77(8)