Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Color Change of Major Wood Species Planted in Indonesia by Ultraviolet Radiation

자외선 조사에 의한 인도네시아 주요 조림수종 목재의 재색변화

  • Park, Se-Hwi (College of Forest & Environmental Sciences, Kangwon National University) ;
  • Jang, Jae-Hyuk (College of Forest & Environmental Sciences, Kangwon National University) ;
  • Qi, Yue (College of Forest & Environmental Sciences, Kangwon National University) ;
  • Hidayat, Wahyu (College of Forest & Environmental Sciences, Kangwon National University) ;
  • Hwang, Won-Joong (Korea Forest Research Institute) ;
  • Febrianto, Fauzi (Bogor Agricultural University) ;
  • Kim, Nam-Hun (College of Forest & Environmental Sciences, Kangwon National University)
  • 박세휘 (강원대학교 산림환경과학대학) ;
  • 장재혁 (강원대학교 산림환경과학대학) ;
  • ;
  • ;
  • 황원중 (국립산림과학원) ;
  • ;
  • 김남훈 (강원대학교 산림환경과학대학)
  • Received : 2015.08.26
  • Accepted : 2015.10.26
  • Published : 2016.01.25
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Abstract

This study was performed to understand wood durability to climate deterioration of planted Indonesian wood specie such as Albizia, Gmelina, Mangium and Mindi. Wood samples were exposed to indoor and outdoor condition. $L^*a^*b^*$ and Color changes (${\Delta}E*ab$) were determined by a spectrophotometer. As a result, color of all samples was changed more markedly by ultraviolet radiation. In indoor test with UV, brightness of wood specimens from four species was not changed and all samples were changed into more reddish and yellowish. In accelerated weathering test, all samples were bleached and changed into more greenish and blueish. In outdoor test, brightness of wood specimens decreased in Albizia and Gmelina and increased in Mangium and Mindi. All wood specimens in outdoor test were changed into more greenish and blueish. Albizia and Gmleina woods showed greater color change than those of Mangium and Mindi. Especially, color change of wood samples might be influenced greatly by moisture. In conclusion, wood color changed into more clearly by UV radiation. Therefore, exposing woods to UV radiation could be one of reasonable methods to improve wood quality on visual characteristic.

본 연구에서는 인도네시아산 주요 조림 4수종 목재의 기후열화에 대한 내구성을 평가하기 위하여 재색변화를 조사하였다. 자외선, 촉진내후시험 및 야외노출 등의 세 가지 조건에서 실험하였고 색차계를 이용하여 재색변화($L^*a^*b^*$)와 색변화량(${\Delta}E*ab$)을 측정하였다. 그 결과, 공시수종 목재 모두 자외선 조사에 의해 목재의 색이 뚜렷하게 변화되었다. 자외선 노출조건에서 명도는 거의 변화가 없었고, 4수종 목재 모두 적색화 및 황색화가 진행되었다. 촉진내후시험 조건에서 공시목재 모두 백색화가 진행되었고, 녹색화 및 청색화가 진행되었다. 야외폭로 조건에서 Albizia재와 Gmelina재는 백색도가 감소하였고, Mangium재와 Mindi재는 백색도가 오히려 상승하였으며, 4수종 모두 녹색화 및 청색화가 진행되었다. 색변화량은 자외선노출 조건에서 Albizia재와 Gmelina재가 컸고 Mangium재와 Mindi재는 다소 작았다. 또한, 목재의 색변화는 자외선과 더불어 수분의 존재상태에 크게 의존하는 것으로 생각되었다. 결론적으로, 자외선 조사는 목재의 색상을 뚜렷하게 하여 목재의 가치를 향상시킬 수 있는 하나의 방법으로 생각되었다.

Keywords

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