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Accessible Unlicensed Requires Authentication Published by De Gruyter July 19, 2011

Uneven distribution of preservative in kiln-dried sapwood lumber of Scots pine: Impact of wood structure and resin allocation

Sheikh Ali Ahmed, Margot Sehlstedt-Persson, Olov Karlsson and Tom Morén
From the journal

Abstract

Scots pine (Pinus sylvestris L.) sapwood lumber was collected after kiln drying and preservative treatment with Celcure AC 800 (a copper-amine wood preservative). Distribution of the preservative throughout the lumber was visually examined. Not all, but some samples showed specific localized areas without any preservative distribution throughout their entire length. Those samples were assessed further for anatomical properties, specifically in impregnated and unimpregnated areas. Additional study was conducted on the morphological nature and redistribution of lipophilic extractives using three different histochemical staining methods. Intrinsic wood properties – especially the frequency of axial resin canals and the percentage of canals blocked – were found to be responsible for the irregular distribution of the preservative. Furthermore, the inability to create continuous and frequent interstitial spaces due to the collapse of thin-walled ray cells throughout the lumber resulted in un-even distribution of preservatives. Staining techniques were useful to localize places with more or less abundance of extractives (e.g., fats) in impregnated and unimpregnated wood, which varied considerably. Histochemical observations revealed information pertaining to the kiln dry specific distribution and redistribution of extractives between the areas. Moreover, resin reallocation and modification in ray parenchyma and resin canals induced by kiln drying would be another reason for the impregnation anomalies.


Corresponding author. Department of Engineering Sciences and Mathematics, Division of Wood Science and Engineering, Wood Physics, Luleå University of Technology, Campus Skellefteå, Forskargatan 1, 931 87 Skellefteå, Sweden Phone: +46 (0) 910 585720 Fax: +46 (0) 910 585399

Received: 2011-3-4
Accepted: 2011-6-24
Published Online: 2011-07-19
Published in Print: 2012-02-01

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