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Creator:: Demessie, Endalkachew Sahle, Hassan, Ali, Levien, Keith L., Kumar, Satish, and Morrell, Jeffrey J.
Abstract:: The effect of supercritical fluid treatment on superficial gas permeability of Douglas-fir was investigated by using carbon dioxide either alone or amended with methanol. Permeability increased in a majority of samples, although nearly one-third of the specimens declined in permeability. Improvements in permeability appeared to be unrelated to variations in...
Resource Type:: Article

Creator:: Smith, Susan M., Demessie, E. Sahle, Morrell, Jeffrey J., Levien, Keith L., and Ng, Harry
Abstract:: Adverse effects on mechanical properties from using a supercritical fluid (SCF) to increase preservative penetration of refractory woods were evaluated by treating small ponderosa pine sapwood specimens with supercritical carbon dioxide at 64 combinations of temperatures (35 to 80 C), pressure (1,000 to 4,000 psig), and time (0.5 to 2...
Resource Type:: Article

Creator:: Schneider, Philip F., Levien, Keith L., and Morrell, Jeffrey J.
Abstract:: The development of pressure inside wood during preservative impregnation was studied using Douglas-fir heartwood and ponderosa pine sapwood. Pressure sensors mounted on sample holders provided the most reliable measurements. As expected, pressure equilibrated most rapidly with air as the treatment medium and ponderosa pine as the test species. Pressure changes...
Resource Type:: Article

Creator:: Acda, Menandro N., Morrell, Jeffrey J., and Levien, Keith L.
Abstract:: The effects of supercritical fluid (SCF) impregnation on physical properties of composites were investigated at various pressures, temperatures, and treatment times with carbon dioxide as the fluid and tebuconazole as a biocide. In general, within the ranges tested, SCF treatment had no negative effects on modulus of rupture (MOR), modulus...
Resource Type:: Article

Creator:: Kang, Sung-Mo, Levien, Keith L., and Morrell, Jeffrey J.
Abstract:: The effect of process variations under supercritical conditions on cyproconazole retention and distribution in ponderosa pine sapwood boards was assessed. While pressure and temperature appeared to affect biocide solubility to some extent, the overall results suggested that biocide movement into wood was influenced more by diffusion than bulk flow. Biocide...
Resource Type:: Article

Creator:: Acda, Menandro N., Morrell, Jeffrey J., and Levien, Keith L.
Abstract:: This study examines the effects of pressure, temperature, and treatment time on supercritical fluid impregnation of such composites as plywood, particleboard, flakeboard, and medium-density fiberboard. Carbon dioxide with methanol as a cosolvent was used as the supercritical fluid, with tebuconazole as the biocide. Biocide distribution, as measured by extraction and...
Resource Type:: Article

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