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The Photostabilising Effect of Coating Layers on CTMP‐based Papers
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. (FSCN – Fibre Science and Communication Network)
2006 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University , 2006.
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 13
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-9104OAI: oai:DiVA.org:miun-9104DiVA, id: diva2:222244
Presentation
(English)
Available from: 2009-06-08 Created: 2009-06-08 Last updated: 2009-07-13Bibliographically approved
List of papers
1. Light-induced yellowing of mechanical and chemimechanical pulp sheets: influence of wood raw material, process and ageing method
Open this publication in new window or tab >>Light-induced yellowing of mechanical and chemimechanical pulp sheets: influence of wood raw material, process and ageing method
2007 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 22, no 1, p. 117-123Article in journal (Refereed) Published
Abstract [en]

The light-induced brightness reversion of different types of unbleached and bleached high-yield pulps was studied under both accelerated and long-term ambient light-induced ageing conditions. It was found that accelerated ageing conditions that mimic indoor daylight exposures overestimate the yellowing tendencies of hardwood high-yield pulps (especially aspen pulps) compared to long-term ambient aging with no indirect sunlight present. It was, however, possible to predict the yellowing characteristics of softwood high-yield pulps. The lignin content of the pulps was found to be strongly correlated with the degree of photo-yellowing in the case of long-term ambient light-induced ageing. The presence of small amounts of birch chemithermomechanical pulp (CTMP) in a fine paper furnish resulted in extensive light-induced discoloration. The extent of photo-yellowing was found to be nearly linearly related to the amount of birch CTMP in the paper.

Keywords
High-yield pulp, Softwood, Hardwood, Light-induced, Ageing, Light sources, Lignin, Pulping processes
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-426 (URN)10.3183/NPPRJ-2007-22-01-p117-123 (DOI)000248528700017 ()2-s2.0-34247205393 (Scopus ID)4076 (Local ID)4076 (Archive number)4076 (OAI)
Note

Erratum: Light-induced yellowing of mecanical and chemimecanical pulp sheets - Influence of wood raw material, process and aging method (Nordic Pulp and Paper Research Journal (2007) 22:1 (122)) Page 275

ScopusID: 2-s2.0-34547245485

Available from: 2008-11-13 Created: 2008-11-13 Last updated: 2017-12-13Bibliographically approved
2. A novel method for studying the photo-stabilising properties of coating layers
Open this publication in new window or tab >>A novel method for studying the photo-stabilising properties of coating layers
2006 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

A new model system was developed which made it possible to study the reflectance and transmittance of thin coating layers (<10 g/m2) in a reproducible way, and to link this to the inhibition of the light-induced yellowing (Figure 1). The UV/VIS-screening properties of coatings of different coat weights containing common pigments such as kaolin, calcium carbonate (ground or precipitated) and titanium dioxide will be reported. The ability of a coating layer to protect a birch CTMP from light-induced discoloration will be exemplified using the evolved model system. An estimation of the contribution of different wavelength regions of the illuminating light to the photo-yellowing of various types of materials will also be shown. The developed method is a valuable tool for future photo-yellowing studies as well as for optimisation of the pigment coating formulation for various paper grades.

Keywords
High-yield pulp, CTMP, Birch, Coating, Pigments, Kaolin, Calcium carbonate, Light-induced, Ageing
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-3624 (URN)4079 (Local ID)4079 (Archive number)4079 (OAI)
Conference
5th Fundamental Mechanical Pulp Reserch Seminar (FMPRS),Trondheim, Norway, 31 May-1 June 2006
Available from: 2008-09-30 Created: 2009-06-08 Last updated: 2013-12-17Bibliographically approved
3. Inhibition of light-induced brightness reversion of high-yield pulps: the UV-screening properties of coating layers containing kaolin or calcium carbonate pigments
Open this publication in new window or tab >>Inhibition of light-induced brightness reversion of high-yield pulps: the UV-screening properties of coating layers containing kaolin or calcium carbonate pigments
2007 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 22, no 3, p. 350-355Article in journal (Refereed) Published
Abstract [en]

A newly developed method making it possible to study the reflectance/transmittance of thin coating layers and to link this to the inhibition of the light-induced yellowing, was used to describe the photo-stabilising properties of different types of commercial kaolin and calcium carbonate pigments. A base paper produced from a hydrogen-peroxide-bleached birch chemithermomechanical pulp (CTMP) was used throughout the study.The transmittance of the coating layers in the UV-region (300-385 nm) was found to be very low (below 1.0% at coat weights < 5g/m2) for all of the tested pigments, it strongly depends on the coat weight especially for coat weights below 10 g/m2. The kaolin pigments examined were found to be better in inhibiting the brightness reversion compared to the calcium carbonate pigments, even though the differences between the pigment types were only a few brightness units. The coating layer was, however, able to conceal some of the colour formed through the light-induce brightness reversion. For example, a coating layer consisting of kaolin pigments (coat weight of 15.6 g/m2) could conceal about 30% of the discoloration of the CTMP base paper.

Keywords
High-yield pulp, CTMP, Birch, Coating, Pigments, Kaolin, Calcium carbonate, Light-induced, Ageing
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-429 (URN)10.3183/NPPRJ-2007-22-03-p350-355 (DOI)000250025000010 ()2-s2.0-34948836656 (Scopus ID)4078 (Local ID)4078 (Archive number)4078 (OAI)
Available from: 2008-11-13 Created: 2008-11-13 Last updated: 2017-12-13Bibliographically approved

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Fjellström, Helena

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