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Consolidation and Rheology at High Solids Content
2004 (English)Doctoral thesis, monograph (Other academic)
Abstract [en]

Paper and board are pigment coated in order to achieve a smooth surface, thereby enhancing the optical and printing properties. In the most frequently used technique, a metal blade is used for metering off the coating colour, which is typically applied by roll or jet application. The coating colour consists of an aqueous suspension of mineral pigments to which is added binders and other additives. For a good coating result, optimisation of the water retaining properties of the coating colour is crucial. In the present study the consolidation of coating colour layers has been studied using rheology as the main tool. A new method for evaluation of the dewatering is presented. This method also comprises a means of calculating a qualitative value for the thickness of the immobilised coating colour layer formed at the interface between base paper and wet coating colour. Results from pilot coater trials have been used to validate the method. The study also comprises a frequency analysis evaluation of the influence of dewatering and metering blade showing that a high blade pressure in combination with a high water retention of the coating colour may lead to a more evenly spread coating layer. Furthermore, the extensional viscosity of three frequently used thickening polymers has been studied to evaluate their possible influence on the dewatering rate. The results showed that extensional viscosity does not play any significant role for the dewatering at zero external pressure

Place, publisher, year, edition, pages
Karlstad: Karlstad University Studies , 2004.
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-17826ISBN: 91-85335-12-6 (print)OAI: oai:DiVA.org:kau-17826DiVA, id: diva2:591441
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21

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CiteExportLink to record
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  • apa
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