Abstract
Among the various methods used to improve the sound absorption capability of wood, we focused on delignification in Indonesian momala (Homalium foetidum) and Korean red toon (Toona sinensis). 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.
Highlights
There is much interest in using eco-friendly sound-absorbing materials to reduce noise pollution [1]
Gas bility and sound absorption capability improved. They confirmed that the pore structure permeability and sound absorption capability improved. They confirmed that the pore of wood was changed through delignification treatment, which improved the sound abstructure of wood was changed through delignification treatment, which improved the sorption capability
Momala showed a diffuse-porous wood shape with evenly distributed vessels, while the red toon showed a ring-porous wood shape with large vessels distributed in the spring wood
Summary
There is much interest in using eco-friendly sound-absorbing materials to reduce noise pollution [1]. Gas bility and sound absorption capability improved They confirmed that the pore structure permeability and sound absorption capability improved. They confirmed that the pore of wood was changed through delignification treatment, which improved the sound abstructure of wood was changed through delignification treatment, which improved the sorption capability. There are few studies, that show how delignification affects sound absorption capability. Our study examines how the pore shape of wood is changed after delignification and Our study examines how the pore shape of wood is changed after delignification how these changes affect the the gas gas permeability andand sound absorption capability.
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