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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
Experiences of safety analyses in the pulp and paper industry, TAPPI JOURNAL, May 1993, Vol. 76(5)

Experiences of safety analyses in the pulp and paper industry, TAPPI JOURNAL, May 1993, Vol. 76(5)

Magazine articles
Open Access
A visit to mount st. helens; meta lake illustrates natural recovery following volcanic eruption, TAPPI JOURNAL, April 1994, Vol. 77(4)

A visit to mount st. helens; meta lake illustrates natural recovery following volcanic eruption, TAPPI JOURNAL, April 1994, Vol. 77(4)

Magazine articles
Open Access
The epa's process safety management program for preventing accidental chemical releases (40 cfr 68), TAPPI JOURNAL, April 1994, Vol. 77(4)

The epa's process safety management program for preventing accidental chemical releases (40 cfr 68), TAPPI JOURNAL, April 1994, Vol. 77(4)

Magazine articles
Open Access
Suction roll pilot bearing failure due to inadequate lubrication, TAPPI JOURNAL, December 1994, Vol. 77(12), TAPPI JOURNAL, December 1994, Vol. 77(12)

Suction roll pilot bearing failure due to inadequate lubrication, TAPPI JOURNAL, December 1994, Vol. 77(12), TAPPI JOURNAL, December 1994, Vol. 77(12)

Magazine articles
Open Access
China paper technical program and exhibit came of age in 1995, TAPPI JOURNAL, March 1996, Vol. 79(3)

China paper technical program and exhibit came of age in 1995, TAPPI JOURNAL, March 1996, Vol. 79(3)

Magazine articles
Open Access
1995 Finishing and Converting Conference: Taking advantage of changing trends, TAPPI JOURNAL, March 1996, Vol. 79(3)

1995 Finishing and Converting Conference: Taking advantage of changing trends, TAPPI JOURNAL, March 1996, Vol. 79(3)

Magazine articles
Open Access
Inside ctapi, TAPPI JOURNAL, May 1996, Vol. 79(5)

Inside ctapi, TAPPI JOURNAL, May 1996, Vol. 79(5)

Magazine articles
Open Access
Suzhou papyrus paper readies 100,000 ton coated fine paper mill, TAPPI JOURNAL, May 1996, Vol. 79(5)

Suzhou papyrus paper readies 100,000 ton coated fine paper mill, TAPPI JOURNAL, May 1996, Vol. 79(5)

Magazine articles
Open Access
Cedar river's linerboard machine inaugurated, TAPPI JOURNAL, November 1996, Vol. 79(11)

Cedar river's linerboard machine inaugurated, TAPPI JOURNAL, November 1996, Vol. 79(11)

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