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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.

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Editor's Note: Recovery Boiler Insights, TAPPI JOURNAL Febru

Editor's Note: Recovery Boiler Insights, TAPPI JOURNAL February 2010

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Open Access
Editorial: Celebrating Wayne Carr

Editorial: Celebrating Wayne Carr: A true recycling visionary, TAPPI JOURNAL November 2017

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Open Access
The Chinese ban on recovered paper imports

The Chinese ban on recovered paper imports: An international disruption, TAPPI JOURNAL November 2017

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Open Access
Deinking process water flotation

Deinking process water flotation: An innovative solution to improve deinking and papermaking processes efficiency, TAPPI JOURNAL November 2017

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Open Access
Editorial: To paper and beyond at the University of Minnesot

Editorial: To paper and beyond at the University of Minnesota, TAPPI JOURNAL October 2017

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Open Access
Lignin value prior to pulping (LVPP): An advanced pulping c

Lignin value prior to pulping (LVPP): An advanced pulping concept, TAPPI JOURNAL October 2017

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Open Access
Degradation of 2,4-dichlorophenol by melamine amine cellulos

Degradation of 2,4-dichlorophenol by melamine amine cellulose- immobilized lacasses, TAPPI JOURNAL October 2017

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Open Access
Formation mechanisms of “jellyroll” smelt in kraft recovery

Formation mechanisms of “jellyroll” smelt in kraft recovery boilers, TAPPI JOURNAL October 2017

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Open Access
Editorial: Multifaceted research at the University of Maine

Editorial: Multifaceted research at the University of Maine, TAPPI JOURNAL September 2017

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