Study on the Drying Properties of Eucalyptus grandis x E. urophylla under Floating Pressure Conditions

In this paper, Eucalyptus grand is × E.urophylla was pretreated under 100°C steam and boiling water conditions respectively, and then the pretreatment and untreated specimens were dried in a kiln in which the temperature was 65°C and the pressure varied between 0.1MPa and 0.3M Paevery one hour. As a result, we got the conclusions that, both 100°C steam and boiling water pretreatment could reduce wood moisture content significantly during treating process and the rates of 100°C steam pretreatment is 15.7% per hour which is higher than that of boiling water pretreatment which is 11.6%; Under the floating pressure condition, the drying rates of 100°C steam, boiling water pretreatment and untreated specimen are 0.97%, 0.98%, 0.86% per hour respectively which are much faster than that of the results of existing researchers in this fields, When the moisture content of eucalyptus is above the fiber satiation point, the drying rates of pretreatment specimens are fast than that of untreated specimen, on the contrast, when the moisture content of specimens are below FSP, the drying rates of untreated specimen are much faster.