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Journal articles
Magazine articles
Open Access
Flocculation of fiber suspensions studied by Rheo-OCT, TAPPI Journal September 2024

ABSTRACT: When dealing with papermaking fiber suspensions, particle flocculation takes place even before the paper web is formed. The particle flocculation depends on several aspects, including particle mass concentration (consistency), particle collisions, electrochemical interactions promoted by chemical additives, etc. Due to its importance, fiber suspension flocculation has been studied for a long time in papermaking, and several methods have been developed for this purpose. The traditional techniques include, for example, focused beam reflectance microscopy (FBRM) and high-speed video imaging (HSVI). Recently, a new optical method, optical coherence tomography (OCT), has emerged for flocculation analysis. The advantages of OCT are the possibility to study opaque suspensions, its micron-llevel resolution, and its high data acquisition speed. The OCT measurements can be combined with rheological (Rheo) measurements, allowing simultaneous measurement of both the time evolution of the floc size and the suspension viscosity. In this work, we used this approach, Rheo-OCT, to study the flocculation of suspensions of various papermaking furnishes. We analyzed the time evolution of the floc size and the fiber suspension viscosity when the studied papermaking suspensions were treated with highly refined furnish (HRF) — a furnish that contained a significant amount of micofibrillated cellulose (MFC)-type fibrils — and/or chemical additives. Such studies can lead to a better understanding of the impact of flocculation on the produced paper web in terms of qualities like formation, drainage potential, and strength behavior.

Magazine articles
Open Access
English as a first and second language - part 7: a strategy for spelling, TAPPI JOURNAL, October 1998, Vol.81(10)

English as a first and second language - part 7: a strategy for spelling, TAPPI JOURNAL, October 1998, Vol.81(10)

Magazine articles
Open Access
Technology spotlight - the tradeoffs: finishers and converters encounter speed, TAPPI JOURNAL, October 1998, Vol.81(10)

Technology spotlight - the tradeoffs: finishers and converters encounter speed, TAPPI JOURNAL, October 1998, Vol.81(10)

Magazine articles
Open Access
The industry: beyond 2000, TAPPI JOURNAL, October 1998, Vol.81(10)

The industry: beyond 2000, TAPPI JOURNAL, October 1998, Vol.81(10)

Magazine articles
Open Access
Indonesian update: a country in change, an industry in recovery, TAPPI JOURNAL, September 1998, Vol. 81(9)

Indonesian update: a country in change, an industry in recovery, TAPPI JOURNAL, September 1998, Vol. 81(9)

Magazine articles
Open Access
TAPPI 99: the largest event in the 87-year history of TAPPI,

TAPPI 99: the largest event in the 87-year history of TAPPI, TAPPI JOURNAL, April 1999, Vol. 82(4)

Magazine articles
Open Access
An overview of the south african pulp and paper industry, TAPPI JOURNAL, April 1999, Vol. 82(4)

An overview of the south african pulp and paper industry, TAPPI JOURNAL, April 1999, Vol. 82(4)

Magazine articles
Open Access
TAPPSA-south africa's technical association, TAPPI JOURNAL,

TAPPSA-south africa's technical association, TAPPI JOURNAL, April 1999, Vol. 82(4)

Magazine articles
Open Access
Retention aids for highspeed paper machines, TAPPI JOURNAL, April 1999, Vol. 82(4)

Retention aids for highspeed paper machines, TAPPI JOURNAL, April 1999, Vol. 82(4)

Magazine articles
Open Access
Hot melt symposium blends technical and marketing presentations, TAPPI JOURNAL, August 1999, Vol. 82(8)

Hot melt symposium blends technical and marketing presentations, TAPPI JOURNAL, August 1999, Vol. 82(8)

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