Using methanol and ethanol vapours as drying media for producing bright colour wood in drying of radiata pine (2006)
In kiln drying of high value grade softwood timber, kiln brown stain (KBS) is a major drying defect and induces significant loss. In this work, research has been conducted to dry radiata pine sapwood in alternative oxygen-free drying medium in order to produce bright coloured wood in kiln drying of softwood timber. In the experiment, samples were dried in a newly designed experiment rig by using methanol or ethanol vapours, respectively, at drying temperatures of 90, 100 and 110°C. For comparison, the matched wood samples were also dried in hot air in a tunnel dryer using the same temperatures. The results showed that no obvious KBS were detected on the surface of sample boards when being dried in either the methanol vapour or the ethanol vapour at all of the temperatures tested. However, for hot air drying, KBS was obviously observed. These results indicate that using an alternative oxygen-free medium to dry wood could be an effective way for preventing surface discolouration.
CitationPang, S. (2006) Using methanol and ethanol vapours as drying media for producing bright colour wood in drying of radiata pine. Budapest, Hungary: 15th International Drying Symposium (IDS 2006), 20-23 Aug 2006. Drying 2006 - Proceedings of the 15th International Drying Symposium (IDS 2006), v. C, p. 1745-1749.
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Keywordskiln brown stain; radiata pine sapwood; oxygen-free drying medium; bright colour
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Use of a modified drying medium to prevent discolouration of radiata pine sapwood during kiln drying Pang, S.; Li, J. (University of Canterbury. Chemical and Process Engineering., 2006)Wood darkening and kiln brown stain (KBS) in kiln drying has caused significant economic loss to the wood processing industry which. Although extensive studies have been performed, feasible drying techniques have not yet ...
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Dieste, Andrés (University of Canterbury. Chemical and Process Engineering, 2002)This study quantifies discolouration on the surface of Pinus radiata boards during kiln drying, particularly kiln brown stain (KBS), and models it as a function of chemical compounds present in the wood closest to the ...