Effect of Air Heat Treatment on the Color Change and Weight and Density Loss of Six Korean Oak Woods

초록

The effects of air heat treatment were evaluated on six Korean oak woods: Quercus serrata (Qs), Qs ), Quercus mongolica (Qm), Qm ), Quercus acutissima ( Qac ), Quercus aliena ( Qal ), Quercus dentata (Qd), Qd ), and Quercus variabilis (Qv). Qv ). Color change (Delta E*), E* ), weight loss, and density loss were examined using flat-sawn heartwood boards before and after treatment at 160 degrees C, 180 degrees C, 200 degrees C, and 220 degrees C for 2 h. Overall, the Delta E*, E* , weight loss, and density loss increased with temperature. The properties between temperature and species showed distinct differences. A change to a darker color was observed in all species after treatment at 200 degrees C. Qm and Qd exhibited the highest and lowest L* , a* , and b* values after treatment at 220 degrees C, respectively. The highest Delta E* E* values were obtained in Qd at 160 degrees C, Qs at 180 degrees C and 200 degrees C, and Qv at 220 degrees C. Qd and Qv exhibited the highest and lowest weight losses at 160 degrees C, respectively. Qac and Qal showed the highest and lowest weight losses at 220 degrees C, respectively. Qm showed the highest density loss at all temperatures, whereas Qs had the lowest at 160 degrees C, and Qac had the lowest values at 180 degrees C, 200 degrees C, and 220 degrees C.

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