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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
Microstructure simulation of early paper forming using immersed boundary methods, TAPPI JOURNAL November 2011

Microstructure simulation of early paper forming using immersed boundary methods, TAPPI JOURNAL November 2011

Journal articles
Open Access
A study of the mechanical properties of coated papers using elastica stiffness and low-load indentation, TAPPI JOURNAL October 2011

A study of the mechanical properties of coated papers using elastica stiffness and low-load indentation, TAPPI JOURNAL October 2011

Journal articles
Open Access
Changes in forests and their relationship to air quality, TAPPI JOURNAL April 1988 88APR103

Changes in forests and their relationship to air quality, TAPPI JOURNAL April 1988

Journal articles
Open Access
Nonwovens: the state of the art, TAPPI JOURNAL April 1988 88APR115

Nonwovens: the state of the art, TAPPI JOURNAL April 1988

Journal articles
Open Access
The state of the art of microfiltration-Current and future applications, TAPPI JOURNAL April 1988 88APR123

The state of the art of microfiltration-Current and future applications, TAPPI JOURNAL April 1988

Journal articles
Open Access
Recent developments in pressure-sensitive adhesives, TAPPI JOURNAL April 1988 88APR129

Recent developments in pressure-sensitive adhesives, TAPPI JOURNAL April 1988

Journal articles
Open Access
Computational model for water drainage in fourdrinier paper machines, TAPPI JOURNAL April 1988 88APR133

Computational model for water drainage in fourdrinier paper machines, TAPPI JOURNAL April 1988

Journal articles
Open Access
Automotive nonwoven filter medial: their constructions and filter mechanisms, TAPPI JOURNAL April 1988 88APR161

Automotive nonwoven filter medial: their constructions and filter mechanisms, TAPPI JOURNAL April 1988

Journal articles
Open Access
Use of fillers in papermaking, TAPPI JOURNAL April 1988 88APR77

Use of fillers in papermaking, TAPPI JOURNAL April 1988

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