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정희석,찰리코즈리크 한국목재공학회 1983 목재공학 Vol.11 No.5
Press-drying was used an 0.25 inch-and 0.50 inch-thick flatsawn board of Oregon white oak heartwood at platen temperature of constant boiling point (212 F), constant lower plateau temperature (244 F) and combination of boiling point for 40 minutes and lower plateau temperature later by using platen pressure of 35 pounds per square inch to explore the effect of temperature step-press drying on drying rate and honeycombing. The results of study were same as follows. 1. Press-drying of constant boiling point increased drying times and decreased honeycombing considerably for boards of bath thicknesses. 2. Press-drying of constant plateau temperature reduced drying times but showed severe honeycombing for boards of both thicknesses. 3. Press-drying of temperature step-press drying decreased drying times and honeycombing far 0.25 inch thick boards the same as press-drying of constant lower plateau temperature, but not decreased drying times and honey-combing for 0.50 inch-thick boards.
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정희석,찰리코즈리크 한국목재공학회 1983 목재공학 Vol.11 No.6
This study was to determine drying rate and degrade for modification of kiln drying schedule by acceleration with small changes in kiln drying condition at higher moisture content of 4/4 Oregon White oak lumber (Quercus garryana Dough. The kiln drying schedule to minimize drying defects such as surface checks and collapse arid the dry grade were as follows. 1. The kiln drying condition is required dry-bulb temperature of 112℉ with a wet-bulb depression of 8℉ until the average moisture content is 66 percent or higher. 2. The kiln drying condition is required dry-bulb temperature of 114℉ with a wet-bulb depression of 10℉ with a wet-bulb depression of 10℉ until the average moisture content is 47 percent or higher. 3. The kiln drying condition is required dry-bulb temperature of 115℉ with a wet-bulb depression of 11℉ until the average moisture content is 31 percent or higher. 4. The kiln drying conditions can employ step by step severe schedule at dry-bulb temperature of 120℉ to 170℉ with a wet-bulb depression of 16℉ to 40℉ until the average moisture content is 31 percent or lower. 5. Quality of dried material using above kiln schedule are good and is shown in table 2.
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