Abstract

This study was carried out to investigate the dimensional stability of wood treated with PEG for better utilization of domestic small-diameter logs. Four species of ring- porous wood(Quercus mongolica F_ISCH, Quercus variabilis B_LUME, Fraxinus rhynchophylla H_ANCE, Paulownia coreana U_YEKI,) and four species of diffuse-porous wood(Prunus sargentii R_EHDER, Betula davurica P_ALL, Populus tomentiglandulosa T. L_EE, Cornus controversa H_EMSLEY) were used for this experiment. The shrinkage of wood decreased with increasing the concentration of PEG. The shrinkage of diffuse- porous woods was lower than that of ring-porous woods. The weight gain increased in proportional to the PEG concentration. Diffuse-porous woods showed a little higher weight gain than ring-porous woods. Bulking effect also increased with increasing the PEG concentration, but was in inverse proportional to the molecular weight of PEG. Diffuse-porous woods showed higher bulking effect than ring-porous woods. Consequently, diffuse-porous woods showed better dimensional stability than ring- porous woods. It was considered that dimensional stability was affected by characteristics of wood such as vessel and tylosis, and density.

본 연구에서는 국내산 소경재의 보다 효율적인 이용을 위하여 PEG처리한 활엽수재의 환공재 4수종(신갈나무, 굴참나무, 물푸레나무, 오동나무)과 산공재 4수종(산벚나무, 물박달나무, 층층나무, 은사시나무)에 대한 치수안정성을 평가하였다. 수축률은 공시수종 모두 PEG처리에 의해 감소하는 효과가 있었고, 산공재가 환공재보다 낮았다. 중량증가율은 PEG농도의 증가에 따라 증가되었고, 산공재가 환공재 보다 다소 높은 증가율을 보여주었다. 벌킹효과는 PEG농도의 증가에 따라 증가하였지만, 분자량이 클수록 감소하였고, 산공재가 환공재보다 벌킹효과가 높게 나타났다. 결론적으로, 산공재가 환공재보다 높은 치수안정성을 보여주었다. 따라서 PEG처리재의 치수안정효과는 목재의 구조(도관의 분포상태 및 타이로시스 존재유무)와 밀도에 크게 영향받는 것으로 생각되었다.

Keywords

• Dimensional stability;
• shrinkage;
• polyethylene glycol(PEG);
• bulking effect;
• weight gain;
• ring porous wood;
• diffuse porous wood