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Magazine articles
Open Access
Quality and environmental management system: electronic documentation management, TAPPI JOURNAL, April 1999, Vol. 82(4)

Quality and environmental management system: electronic documentation management, TAPPI JOURNAL, April 1999, Vol. 82(4)

Magazine articles
Open Access
Mondi in south africa, TAPPI JOURNAL, April 1999, Vol. 82(4)

Mondi in south africa, TAPPI JOURNAL, April 1999, Vol. 82(4)

Magazine articles
Open Access
Practical sheeting and packaging methods for soho market, TAPPI JOURNAL, April 1999, Vol. 82(4)

Practical sheeting and packaging methods for soho market, TAPPI JOURNAL, April 1999, Vol. 82(4)

Magazine articles
Open Access
Views from the top: ceos offer global perspectives on the pulp and paper industries, TAPPI JOURNAL, August 1999, Vol. 82(8)

Views from the top: ceos offer global perspectives on the pulp and paper industries, TAPPI JOURNAL, August 1999, Vol. 82(8)

Magazine articles
Open Access
UGA warnell school of forest resources builds mobile lab for wastewater analyses and management, TAPPI JOURNAL, December 1999, Vol. 82(12)

UGA warnell school of forest resources builds mobile lab for wastewater analyses and management, TAPPI JOURNAL, December 1999, Vol. 82(12)

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.

Magazine articles
Open Access
Shop talk: reducing voc emissions with thermal oxidation units, TAPPI JOURNAL, December 1997, Vol. 80(12)

Shop talk: reducing voc emissions with thermal oxidation units, TAPPI JOURNAL, December 1997, Vol. 80(12)

Magazine articles
Open Access
Life after logging, TAPPI JOURNAL, January 1997, Vol. 80(1)

Life after logging, TAPPI JOURNAL, January 1997, Vol. 80(1)

Magazine articles
Open Access
Survival techniques: extending the life of press fabrics, TAPPI JOURNAL, July 1997, Vol. 80(7)

Survival techniques: extending the life of press fabrics, TAPPI JOURNAL, July 1997, Vol. 80(7)

Magazine articles
Open Access
1998 tappi pulping conference, TAPPI JOURNAL, March 1999, Vo

1998 tappi pulping conference, TAPPI JOURNAL, March 1999, Vol. 82(3)

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