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Mold susceptibility of oriented strandboard made with extracted flakes
2008 - IRG/WP 08-40402
As part of a larger study on the manufacture of oriented strandboard (OSB) using hot-water-extracted flakes, the mold susceptibility of extracted-flake and un-extracted-flake OSB was assessed using the standard ‘mold box’ test. OSB made with extracted flakes was much less susceptible to mold. This suggests that the extraction of hemicelluloses and other carbohydrates from wood for the production of biofuel could be combined with the production of OSB with enhanced durability properties.
A M Taylor, O Hosseinaei, Siqun Wang

Decay Resistance Properties of Hemicellulose-Extracted Oriented Strand Board
2008 - IRG/WP 08-10644
There is increasing interest in using cellulosic biomass as the basis for a renewable source of energy. Although the traditional focus has been on cellulose, researchers are also exploring the possibility of using hemicelluloses because they can be removed with hot water leaving the wood product intact for other applications. However, there is concern that removing hemicelluloses from the precursor material will create spaces in the wood increasing susceptibility to fungal attack. Hemicellulose-extracted oriented strand boards (OSB) were created by exposing red maple strands to a hot water extraction prior to adhesive application and pressing. Treated and untreated boards were tested for decay susceptibility in a modified ASTM soil block jar bioassay using the white rot fungus Pycnoporus sanguineus and the brown rot fungus Meruliporia incrassata. There were no significant differences in weight losses for M. incrassata between hemicellulose extracted and untreated boards at the P = 0.01 level. Weight losses for P. sanguineus were significantly lower for hemicellulose extracted OSB compared to untreated controls. These results indicate that modifying OSB panels by removing hemicelluloses for use in ethanol and other alternative fuel production does not increase decay susceptibility to M. incrassata and confers a degree of decay resistance against P. sanguineus. Additional testing is on-going.
C Howell, J Paredes, S Shaler, J Jellison