Post-thermal treatment of oriented strandboard (OSB) made from cypress (cupressus glauca lam.)
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Universidad del Bío Bío
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The objective of this research was to determine the physical and mechanical properties of orientedstrandboard (OSB) using strands of Cupressus glauca Lam., before and after a thermal treatment, aswell as to evaluate the susceptibility of the boards to fungi attack. Boards with nominal density of 0.70g/cm3 were produced with 5% and 8% of urea-formaldehyde (UF) resin. Physical and mechanicalproperties were evaluated according to ASTM D 1037 (1991) standard and compared with CSA O437.0and ANSI A.208.1 standards. All mechanical properties were higher than those values required by bothstandards, except the modulus of elasticity in parallel axis. The thermal treatment slightly reduced themodulus of elasticity and stress at proportional limit, both in perpendicular axis, however improvedsignificantly dimensional stability. Dimensional stability of the treated OSB was improved at the lowerresin level but did not reach the maximum value required by the Canadian standard. Biological assayshowed that heat-treated cypress OSB exposed to P. sanguineus reduced mass loss from 39% to 50%,while for G. trabeum the reduction was from 40% to 49%. Post thermal treatment of manufacturedOSB (190ºC, 720 s) can be the recommended method to reduce the hygroscopicity without great effecton mechanical properties and to protect panels against these fungi.
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