Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Effects of Heat Treatment on the Characteristics of Royal Paulownia (Paulownia tomentosa (Thunb.) Steud.) Wood Grown in Korea

국산 참오동나무재의 열처리 특성

  • Kim, Yun Ki (Department of College of Forest and Environmental Sciences, Kangwon National University) ;
  • Kwon, Gu Joong (Department of College of Forest and Environmental Sciences, Kangwon National University) ;
  • Kim, Ah Ran (Department of College of Forest and Environmental Sciences, Kangwon National University) ;
  • Lee, Hee Soo (Department of College of Forest and Environmental Sciences, Kangwon National University) ;
  • Purusatama, Byantaradarsan (Department of College of Forest and Environmental Sciences, Kangwon National University) ;
  • Lee, Seung Hwan (Department of College of Forest and Environmental Sciences, Kangwon National University) ;
  • Kang, Chun Won (Department of Housing Environmental Design, Chonbuk National University) ;
  • Kim, Nam Hun (Department of College of Forest and Environmental Sciences, Kangwon National University)
  • Received : 2018.08.08
  • Accepted : 2018.09.05
  • Published : 2018.09.25
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Abstract

Effects of heat treatment on the characteristics of Royal paulownia (Paulownia tometosa) wood were investigated. The results were compared with those of Suwon silver poplar (Populus tementiglandulosa) and Korean red pine (Pinus densiflora) woods. The wood samples of the three species were treated at $160^{\circ}C$, $180^{\circ}C$, $200^{\circ}C$ and $220^{\circ}C$ in an electric furnace for 2 hours. The changes of color, density, mass loss, and relative crystallinity were investigated before and after heat treatment. The lightness ($L^*$) decreased rapidly from $200^{\circ}C$ in all species. There were no change in red-green chromaticity($a^*$) and yellow-blue chromaticity($b^*$) of Royal paulownia and poplar woods with increasing temperature. Whereas, yellow-blue chromaticity($b^*$) of Korean red pine wood decreased sharply from $200^{\circ}C$. Royal paulownia wood showed appreciable color change(${\Delta}E^*$) after heat treatment above $180^{\circ}C$. Poplar and pine woods, however, presented significant color change from $160^{\circ}C$. Color change of the three wood species increased rapidly with increasing temperature. Mass loss of the three wood species by heat treatment was the highest in the Royal paulownia wood and the lowest in the pine wood. Mass loss and relative crystallinity increased and density decreased slightly with increasing temperature. Consequently, it is revealed that Royal paulownia wood showed considerable differences in the temperature of color change, weight loss and change of relative crystallinity compared to the other wood species.

본 연구에서는 국산 참오동나무재의 열처리에 의한 재질특성의 변화를 조사하였다. 비교를 위하여 은사시나무와 소나무재의 열처리 특성을 조사, 검토하였다. 세 공시수종의 목재시험편을 $160^{\circ}C$, $180^{\circ}C$, $200^{\circ}C$ 및 $220^{\circ}C$의 전기로 내에서 2시간 열처리 후, 재색변화($L^*a^*b^*$), 밀도, 중량감소율 및 셀룰로오스의 상대결정화도를 측정하였다. 재색변화 측정결과, 명도($L^*$)는 세 공시수종 목재 모두 $200^{\circ}C$ 이상에서 크게 감소하였다. 참오동나무재와 은사시나무재의 적-녹색도($a^*$)와 황-청색도($b^*$)는 열처리 온도증가에 따른 차이는 거의 없었으나, 소나무재의 $b^*$는 $200^{\circ}C$ 이후 감소하였다. 참오동나무재의 재색변화량(${\Delta}E^*$)은 $160^{\circ}C$ 열처리에서는 거의 없었고 $180^{\circ}C$ 이상에서 크게 나타났으나, 은사시나무와 소나무재는 $160^{\circ}C$에서도 재색변화가 크게 나타났다. 참오동나무재의 밀도는 $160{\sim}180^{\circ}C$ 열처리에서는 거의 변화가 없었고, 중량감소율은 참오동나무재가 가장 크게 나타났다. 열처리온도 증가에 따라 세 수종의 목재의 중량감소율과 상대결정화도는 증가하였으나 밀도는 다소 감소하였다. 결론적으로 참오동나무재는 색변화 온도, 중량감소율 및 상대결정화도 증가량이 비교수종 목재와 다른 특성을 나타났다.

Keywords

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