Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Evaluation of Physico-mechanical Properties and Durability of Larix kaempferi Wood Heat-treated by Superheated Steam

과열증기 열처리 낙엽송재의 물리·역학적 성능 및 내후성능 평가

  • Park, Yonggun (Department of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University) ;
  • Park, Jun-Ho (Department of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University) ;
  • Yang, Sang-Yun (Department of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University) ;
  • Chung, Hyunwoo (Department of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University) ;
  • Kim, Hyunbin (Department of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University) ;
  • Han, Yeonjung (Department of Forest Products, National Institute of Forest Science) ;
  • Chang, Yoon-Seong (Department of Forest Products, National Institute of Forest Science) ;
  • Kim, Kyoungjung (With-Wood Co.) ;
  • Yeo, Hwanmyeong (Department of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University)
  • 박용건 (서울대학교 농업생명과학대학 산림과학부) ;
  • 박준호 (서울대학교 농업생명과학대학 산림과학부) ;
  • 양상윤 (서울대학교 농업생명과학대학 산림과학부) ;
  • 정현우 (서울대학교 농업생명과학대학 산림과학부) ;
  • 김현빈 (서울대학교 농업생명과학대학 산림과학부) ;
  • 한연중 (국립산림과학원 임산공학부) ;
  • 장윤성 (국립산림과학원 임산공학부) ;
  • 김경중 ((주)위드우드) ;
  • 여환명 (서울대학교 농업생명과학대학 산림과학부)
  • Received : 2016.07.19
  • Accepted : 2016.09.09
  • Published : 2016.09.25
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Abstract

In this study, green Larix kaempferi lumber was heat-treated by using superheated steam (SHS) at a pilot scale and then various physico-mechanical properties of the heat-treated wood were evaluated and compared with the properties of conventional hot air (HA) heat-treated wood. Decay resistance of brown rot fungi and compressive strength parallel to the grain of the SHS heat-treated wood without occurrence of drying check from green lumber were increased. On the other hand, density, equilibrium moisture content, shrinkage, and bending strength of the SHS heat-treated wood were lower than those of the conventional HA heat-treated wood. Because heat transfer and thermal hydrolysis of SHS heat treatment was accelerated by a large amount of water, the effect of SHS heat treatment on the physico-mechanical properties was higher than that of HA heat treatment at the similar conditions of temperature and time. From the results of this study, because green lumber can be heat-treated without occurrence of cracks or checks by using SHS and similar heat treatment effect on the physico-mechanical properties of wood can be produced despite a low temperature or short time of heat treatment, it is expected that heat time and energy consumption could be reduced by using SHS.

본 연구에서는 pilot scale에서 과열증기를 이용하여 실대재 낙엽송 생재 각재를 열처리하고, 열처리된 낙엽송재의 다양한 물리 역학적 성능과 내후성능을 측정하였다. 또한, 이를 고온 열기 열처리한 낙엽송재의 물성과 비교하였다. 생재로부터 할렬 발생이 억제된 상태로 과열증기 열처리된 낙엽송재의 갈색부후균과 백색부후균에 대한 저항성과 종압축강도는 증가한 반면에 밀도와 평형함수율 및 수축률과 휨강도는 관행 열처리재보다 낮게 측정되었다. 과열증기 목재 열처리는 다량의 수분에 의해 열전달이 빠르고 열가수분해가 촉진되기 때문에 유사한 시간과 온도에서 열기를 이용하여 관행 열처리한 경우보다 열처리 효과가 높게 나타났다. 따라서 과열증기 열처리 방법은 생재를 할렬 없이 열처리할 수 있으며, 관행 열처리 방법보다 낮은 온도 또는 짧은 열처리 시간으로도 동일한 열처리 효과를 발현시킬 수 있다. 즉, 열처리에 소요되는 시간과 에너지를 줄일 수 있다.

Keywords

References

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