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On the mechanism of GCC filler retention during dewatering - New techniques and initial findings
KTH, Superseded Departments, Pulp and Paper Technology.ORCID iD: 0000-0001-8622-0386
2002 (English)In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 28, no 6, 183-188 p.Article in journal (Refereed) Published
Abstract [en]

The main objective of this present investigation was to clarify the mechanism of ground calcium carbonate (GCC) retention during dewatering through a thick pad of pulp fibres. The effect of filtration was studied by examining the filler particle size distribution before and after filtration of a filler suspension through a thick pad of pulp fibres. Changes in the wet-web pore size distribution in beds with and without filler were measured by liquid porosimetry. The filler distribution through the bed was obtained in SEM micrographs. The results indicate that deposition on fibres is the dominant process. for the retention of commercial GCC particles with a mean particle size of 0.6 and 0.8 pm. Effects of filtration (sieving) were marginal even though experimental conditions (laminar flow and a very high grammage) were chosen to favour such a process.

Place, publisher, year, edition, pages
2002. Vol. 28, no 6, 183-188 p.
Keyword [en]
calcium carbonate, filler retention, mechanism, drainage, fillers, particle size distribution, filtration, deposition, fibers
URN: urn:nbn:se:kth:diva-21685ISI: 000176672400001OAI: diva2:340383
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Wågberg, Lars
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