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Influence of coating formulation on light-induced brightness stability of mechanical and chemimechanical pulp sheets
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. (FSCN – Fibre Science and Communication Network)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Responsible organisation
2005 (English)In: International Mechanical Pulping Conference: IMPC 2005, Oslo, Norway, 7-9 June 2005, 2005, 339-343 p.Conference paper, Published paper (Other academic)
Abstract [en]

The light-induced brightness reversion of different types of high-yield pulps has been studied under accelerated and long-term ambient ageing conditions. It was found that accelerated ageing (xenon lamp used as light source) overestimates the yellowing tendencies of hardwood pulps, whereas it was possible to predict the yellowing characteristics of softwood pulps. The lignin content of the pulps was found to be correlated to the degree of photo-yellowing for long-term ambient ageing. A model system was developed which made it possible to study the reflectance/transmittance of thin coating layers and to link this to the inhibition of the light-induced yellowing. The yellowing characteristics of a coated birch CTMP is exemplified using the evolved model system.

Place, publisher, year, edition, pages
2005. 339-343 p.
Keyword [en]
High-yield pulp, Softwood, Hardwood, Light-induced, Ageing, Light sources, Lignin, CTMP, Birch, Coating, Pigments, Titanium dioxide, Kaolin, Calcium carbonate, Optical brightening agent
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-3783Local ID: 4075OAI: oai:DiVA.org:miun-3783DiVA: diva2:28815
Available from: 2008-09-30 Created: 2009-06-08 Last updated: 2011-04-06Bibliographically approved

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Fjellström, HelenaHöglund, HansForsberg, Sven
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