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The effect of designed wood storage on the brightness of bleached and unbleached thermo mechanical pulp
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2003 (English)In: Nordic Pulp & Paper Research Journal, Vol. 18, no 4, 369-76 p.Article in journal (Refereed) Published
Abstract [en]

60 Norway Spruce (Picea abies) logs were stored in climate chambers for 14 weeks in order to investigate the effect of wood storage on the brightness of thermo mechanical pulp. The storage conditions were altered according to an experimental design comprised of five factors; light, watering, temperature, tree growth and debarking. Wood samples were collected during the storage period and refined into thermo mechanical pulp. ISO brightness values were measured for the unbleached, the dithionite bleached and the hydrogen peroxide bleached thermo mechanical pulp samples that were refined from the stored wood. The decrease in ISO brightness after 14 weeks of wood storage was significant for some of the samples bleached with dithionite. It was found that the interaction between watering and light had a significant negative effect on the brightness of the unbleached and dithionite bleached samples. The samples bleached with hydrogen peroxide generally showed a more consistent ISO brightness. Only watering and temperature had a significant effect on the brightness of peroxide bleached thermo, mechanical pulp.

Place, publisher, year, edition, pages
2003. Vol. 18, no 4, 369-76 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-9923DOI: 10.3183/NPPRJ-2003-18-04-p369-376OAI: oai:DiVA.org:umu-9923DiVA: diva2:149594
Available from: 2008-05-23 Created: 2008-05-23 Last updated: 2013-03-14Bibliographically approved
In thesis
1. Prediction of wood species and pulp brightness from roundwood measurements
Open this publication in new window or tab >>Prediction of wood species and pulp brightness from roundwood measurements
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents a number of studies, where a multivariate approach was taken to construct models that predict wood species and thermo mechanical pulp brightness from roundwood of Norway spruce and Scots pine. The first and second studies produced multivariate prediction models for wood species from the bark of spruce and pine. These models can be used for wood species classification and would replace the manual log assessment that takes place today. Principal Component Analysis, PCA, and Partial least squares projections to Latent Structures, PLS, were used to predict the wood species from multivariate measurements recorded from the bark of spruce and pine. Two different kinds of measurements were employed, near-infrared spectroscopy and digital imaging. Both methods showed that it was possible to predict the wood species with a high accuracy.

The third and fourth studies of the thesis are related to the wood storage of roundwood and the deterioration of wood that occurs during the storage. The third study used an experimental design with five storage factors that provided different conditions for the analysed wood. The experimental design made it possible to identify the factors and the interaction between factors, which were important for the ISO brightness of peroxide and dithionite bleached thermo mechanical pulp, TMP. The final study of the thesis used NIR spectroscopy for predicting the ISO brightness of bleached TMP. Spectra recorded from stored wood were used to construct PLS prediction models.

Place, publisher, year, edition, pages
Umeå: Kemi, 2005. 72 p.
Keyword
Design of Experiments, ISO brightness, Multivariate Image Analysis, Multivariate Modelling, NIR spectroscopy, Norway spruce, PCA, PLS, Roundwood, Scots pine
National Category
Organic Chemistry
Identifiers
urn:nbn:se:umu:diva-605 (URN)91-7305-959-9 (ISBN)
Public defence
2005-10-28, KB3A9, KBC, Umeå Universitet, SE-90187, Umeå, 10:00 (English)
Opponent
Supervisors
Available from: 2005-10-06 Created: 2005-10-06 Last updated: 2011-03-17Bibliographically approved

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