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Journal articles
Magazine articles
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
New enhancers to improve polyethylene oxide retention performance on deinked news-print, TAPPI JOURNAL, September 1997, Vol. 80(9)

New enhancers to improve polyethylene oxide retention performance on deinked news-print, TAPPI JOURNAL, September 1997, Vol. 80(9)

Journal articles
Open Access
Peroxyformic acid pulping of nonwood plants by the milox method - part 1: pulping and bleaching, TAPPI JOURNAL, September 1997, Vol. 80(9)

Peroxyformic acid pulping of nonwood plants by the milox method - part 1: pulping and bleaching, TAPPI JOURNAL, September 1997, Vol. 80(9)

Journal articles
Open Access
Exploring a worldwide technological revolution in coating and graphic arts, TAPPI JOURNAL, September 1997, Vol. 80(9)

Exploring a worldwide technological revolution in coating and graphic arts, TAPPI JOURNAL, September 1997, Vol. 80(9)

Magazine articles
Open Access
Employee commitment, involvement key to future for jack creighton, weyerhaeuser's ceo, TAPPI JOURNAL, September 1997, Vol. 80(9)

Employee commitment, involvement key to future for jack creighton, weyerhaeuser's ceo, TAPPI JOURNAL, September 1997, Vol. 80(9)

Journal articles
Open Access
Newsprint from the perspective of a press manufacturer, TAPPI JOURNAL, September 1997, Vol. 80(9)

Newsprint from the perspective of a press manufacturer, TAPPI JOURNAL, September 1997, Vol. 80(9)

Journal articles
Open Access
Unwind stand maintenance: The key to finishing success, TAPPI JOURNAL, September 1997, Vol. 80(9)

Unwind stand maintenance: the key to finishing success, TAPPI JOURNAL, September 1997, Vol. 80(9)

Journal articles
Open Access
Shop talk: Manufacturing a high-quality slit roll, TAPPI JOURNAL, September 1997, Vol. 80(9)

Shop talk: manufacturing a high-quality slit roll, TAPPI JOURNAL, September 1997, Vol. 80(9)

Journal articles
Open Access
On management: interlaboratory testing: a quality assurance tool for the real world, TAPPI JOURNAL, September 1997, Vol. 80(9)

On management: interlaboratory testing: a quality assurance tool for the real world, TAPPI JOURNAL, September 1997, Vol. 80(9)

Journal articles
Open Access
Trends in U.S. Pulp and Paper Mill SO2 and NOx Emissions, 1980-1995, TAPPI JOURNAL, April 1998, Vol. 81(4)

Trends in U.S. Pulp and Paper Mill SO2 and NOx Emissions, 1980–1995, TAPPI JOURNAL, April 1998, Vol. 81(4)

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