Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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The Color Change of Korean Pine Specimens Oil-Heat-Treated at 180 and 200℃

180℃와 200℃ 오일열처리 잣나무재의 재색변화

  • Lee, Won-Hee (Department of Wood Science and Technology, Kyungpook National University) ;
  • Lim, Ho-Mook (Department of Bio-based Materials, Chungnam National University) ;
  • Kang, Ho-Yang (Department of Bio-based Materials, Chungnam National University)
  • Received : 2015.03.12
  • Accepted : 2015.04.04
  • Published : 2015.07.25
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Abstract

Among several thermal wood modification methods German oil heating technology was applied to Korean pine specimens by heat treatment at $180^{\circ}C$ and $200^{\circ}C$. In addition the matched specimens were heat-treated by Thermowood method. The heat-treated specimens were planed and their colors were measured with a colorimeter at 1 mm and 4 mm below the surfaces. The average lightness index (L*) of Oil-180 specimens was the largest followed by Oil-200 and Tmo-200 specimens. The average redness indexes (a*) of all specimens were increased by heat treatment, while the average yellowness indexes (b*) were variable. The average color differences (${\Delta}E*$) of Oil-200 and Tmo-200 specimens were above 30.0, while that of Oil-180 specimens was only 18.4. It can be concluded that the colors of the heat-teated specimens were uniformly changed because their average color difference indexes (${\Delta}E*$) between the inner layers were below 6.0.

유럽에서 개발된 여러 가지 열개질처리 방법 중 독일의 오일열처리 방법을 적용하여 국산 잣나무 시편을 $180^{\circ}C$와 $200^{\circ}C$에서 열처리하였다. 또 같은 종류의 잣나무 시편을 $200^{\circ}C$에서 Thermowood열처리하였다. 열처리 시편의 표면을 자동대패로 대패한 후 1 mm와 4 mm 깊이의 재색을 색차계로 측정하였다. 열처리 시편 내층의 평균 백색도(L*)는 Oil-180 시편이 가장 높고, Oil-200 시편, Tmo-200 시편 순이다. 열처리에 의해 평균 적색도는 모든 시편이 증가하였으나 평균 황색도는 열처리 조건에 따라 증가하거나, 감소하였다. 무처리와 비교한 평균 색차값(${\Delta}E*$)은 Oil-200 시편과 Tmo-200 시편이 30.0 이상이나, Oil-180 시편은 18.4로 상대적으로 적게 변하였다. 열처리 시편 내층간의 평균 색차값 (${\Delta}E*$)은 6.0 이하로 세 열처리 조건 모두 시편 내층의 재색을 균일하게 변화시켰다고 할 수 있다.

Keywords

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