Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Color Control and Durability Improvement of Yellow Poplar (Liriodendron tulipifera) by Heat Treatments

열처리에 의한 백합나무 재색 제어와 내부후성 제고

  • Yoon, Kyung-Jin (Dept. Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National University) ;
  • Eom, Chang-Deuk (Dept. Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National University) ;
  • Park, Jun-Ho (Dept. Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National University) ;
  • Kim, Ho-Yong (Dept. Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National University) ;
  • Choi, In-Gyu (Dept. Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National University) ;
  • Lee, Jun-Jae (Dept. Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National University) ;
  • Yeo, Hwanmyeong (Dept. Forest Sciences, Research Institute for Agriculture and Life Sciences, Seoul National University)
  • Received : 2009.01.12
  • Accepted : 2009.04.06
  • Published : 2009.11.25
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Abstract

The sapwood of yellow poplar is very bright while its heartwood is usually greenish which changes to dark brown with weathering. This difference in color value between sapwood and heartwood causes difficulty in using yellow poplar as higher value added materials such as interior finish and furniture part. In this study, hot-water treatment, vacuum-heat treatment and oven-heat treatment were carried out to reduce the difference in color value between heartwood and bright sap wood and to increase durability. FT-IR analysis, contact angle measurement and decay test were carried out to find out the mechanism of functional group change and the increment of durability by heat treatment. The result of decrement ratio of color difference were 45.7% by hot-water treatment, 26.8% by vacuum-heat treatment, and 60.2%, 87.8%, and 88.8% by $180^{\circ}C$, $200^{\circ}C$ and $220^{\circ}C$ oven-heat treatments respectively. Furthermore, it has been found that oven-heat treatment causes decrement of mass loss by decay in this study. It is suggested that oven-heat treatment could be environmentally friendly preservative treatment without chemicals.

백합나무의 변재는 매우 밝은 색을 띄나, 원목의 횡단면 중심부내 일부는 녹색계열로 변색되어 있음을 관찰할 수 있다. 이러한 백합나무의 녹색계열 심재 부위와 밝은 나머지 변재의 상이한 색상차는 내장재나 가구재와 같은 고부가가치재로의 이용을 제한한다. 본 연구에서는 백합나무의 상이한 색상차를 감소시키기 위한 재색제어 공정으로 열수처리, 진공열처리, oven열처리를 적용하여 보았다. 또한 열처리시 관능기 변화 매커니즘과 내부후성 증대 효과를 확인하기 위해 FT-IR analysis, 접촉각 측정, 그리고 내부후시험을 실시하였다. 각 처리별 색상차 감소율은 열수처리 45.7%, 진공열처리 26.8%, 그리고 $180^{\circ}C$, $200^{\circ}C$, $220^{\circ}C$ oven열처리는 각각 60.2%, 87.8%, 88.8%로 평가되었다. 또한 oven열처리 시 부후에 의한 질량감소가 줄어 내후부성 증대효과가 있음을 확인하였다. 이를 통해 oven열처리는 화학물질 무첨가형 친환경 방부방충처리 기술의 하나로 사용될 수 있을 것이라고 기대된다.

Keywords

Acknowledgement

Supported by : 산림청

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