Jang Eun-Suk, Kang Chun-Won
Department of Housing Environmental Design and Research Institute of Human Ecology, College of Human Ecology, Jeonbuk National University, Jeonju 54896, Korea.
Materials (Basel). 2021 Sep 10;14(18):5215. doi: 10.3390/ma14185215.
Among the various methods used to improve the sound absorption capability of wood, we focused on delignification in Indonesian momala () and Korean red toon (). We performed gas permeability, pore size, and porosity analyses and evaluated how the change in the pore structure affects the sound absorption capabilities. Results show that delignification increased the through-pore porosity and improved sound absorption capability in both species. In addition, the air gap in the rear space maximized the sound absorption of momala and the red toon. The noise reduction coefficient (NRC) of delignified momala (90 min) with a 3 cm air gap was 0.359 ± 0.023. This is approximately 154.6% higher than that of untreated momala without an air gap. The NRC of delignificated red toon (90 min) with a 3 cm air gap was 0.324 ± 0.040, an increase of 604.3% over untreated red toon without an air gap.
在用于提高木材吸声能力的各种方法中，我们重点研究了印尼莫玛拉木（）和韩国红椿（）的脱木质素处理。我们进行了透气性、孔径和孔隙率分析，并评估了孔隙结构的变化如何影响吸声能力。结果表明，脱木质素处理增加了通孔孔隙率，并提高了两种木材的吸声能力。此外，后部空间的气隙使莫玛拉木和红椿的吸声效果最大化。具有3厘米气隙的脱木质素处理90分钟的莫玛拉木的降噪系数（NRC）为0.359±0.023。这比没有气隙的未处理莫玛拉木高出约154.6%。具有3厘米气隙的脱木质素处理90分钟的红椿的NRC为0.324±0.040，比没有气隙的未处理红椿增加了604.3%。
