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웨스턴 레드시더 큰 정각재(正角材)의 고주파 진공 건조 특성
정희석,스티브로스아브라미디스,리핑카이 한국목재공학회 1998 목재공학 Vol.26 No.3
Western redcedar timber, 26 by 26㎝ in cross section and by 200㎝ long, was dried in a laboratory radio-frequency/vacuum kiln under 65torr of ambient pressure and a fixed frequency of 6.78㎒ for the potential rapidly dry large timber. All process data were collected and saved in a computer through a data acquisition system. The temperature in the middle of timber was higher than temperature at the quarter point of timber length and thickness. Temperature gradients developed in the longitudinal and transverse direction of timber. The pressure in the middle of timber was higher than pressure at the quarter point of timber length. The pressure in the middle of timber was lower in the early stage of drying, and higher in the latter stage of drying than pressure at the quarter point of timber thickness. Power density was very highest during heating period and then gradually decreased. The drying curve was approximately linear and the total drying time was 27 hours from an initial moisture content(MC) of 48.6 percent to a final MC of 19.2 percent with only a few mild internal checks in the middle location of timber.
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