Decolorization of blue stain in lodgepole pine sapwood by hypochlorite bleaching and light exposure

Blue stain reduces the value of wood in appearance applications where the natural wood color is desired. Treatments that remove blue stain without degrading the natural color of the wood could make this lumber more suitable for appearance-grade applications. Previously developed blue stain decoloriz...

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Bibliographic Details
Published in:Forest products journal 2009-07, Vol.59 (7-8), p.47-52
Main Authors: Stirling, Rod, Morris, Paul I
Format: Article
Language:English
Subjects:
Adhesion
bleaching
blue-stain fungi
Chemical properties
Chlorine
Coatings
Coatings industry
Color
decolorization
Discount coupons
Forest products industry
Fourier transforms
Fungi
heartwood
Infrared spectroscopy
Light
lumber
Lumber industry
sapwood
Sodium
sodium hypochlorite
Studies
Surface chemistry
Technology application
Wood products
wood quality
wood treatment
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Summary:Blue stain reduces the value of wood in appearance applications where the natural wood color is desired. Treatments that remove blue stain without degrading the natural color of the wood could make this lumber more suitable for appearance-grade applications. Previously developed blue stain decolorization techniques have been based on straightforward bleaching and have either not fully removed the stain or have discolored the heartwood in an unacceptable manner. The present work investigated the decolorization of blue stain by a combination of hypochlorite bleaching and exposure to intense light. A 10 minute dip treatment in a sodium hypochlorite solution containing 10 to 13 percent available chlorine followed by 10 minutes of exposure to a Xenon arc lamp was found to effectively remove blue stain and induce an attractive aged-pine look in the sapwood and heartwood of lodgepole pine. Near- and mid-infrared spectra indicated changes in surface chemistry after treatment. But, adhesion tests showed no signs of reduced coating adhesion caused by UV damage or hypochlorite exposure. [PUBLICATION ABSTRACT]
ISSN:0015-7473
2376-9637