Sound Absorption Property of Carbonized Medium Density Fiberboards at Different Carbonizing Temperatures

Abstract

This study was carried out to use carbonized medium density fiberboard (MDF) for the replacement of sound absorbing material. Carbonization treatment was performed to improve sound absorption property for MDF at carbonizing temperatures of 500℃, 700℃, 900℃ and 1100℃. As the carbonization temperature increased, the results of the observation by scanning electron microscope (SEM) demonstrated that the fibers exhibited a more compressed morphology within the surface section of the MDF than those within the middle section of MDF. As the carbonizing temperature increased, the cavity increased. The sound absorption coefficient increased between the temperatures of 500℃ and 900℃, but decreased at a temperature of 1100℃. The sound absorption properties of the carbonized MDF and the non-carbonized MDF were compared. The maximum sound absorption coefficient of the carbonized MDF was 12.38%. This was almost double of the value of the non-carbonized MDF.

Effects of Air-Dried Leaves of Evergreen Broad-Leaved Trees on Sound Absorption Property

“…Three replication tests were conducted on each specimen and the mean value of the test results was recorded. After the experimental measurement of SAC, an average SAC was calculated by dividing denominator into numerator in the frequency range of the measurement using the following equation(1) (Won et al, 2015;Jung et al, 2020). Note: The data is the average of 3 samples measured.…”

“…However, these industrial sound-absorbing materials may directly or indirectly cause environmental pollution when discarded, and also have disadvantages that are difficult to reuse and incinerate. Various studies have been conducted on the relationship between noise and wood source materials and/or treatment; wood substrates (Kang and Park, 2001), wood structure and gravity, carbon and heat treatment (Byeon et al, 2010;Won et al, 2015;Kang et al, 2019c), wood by delignification treatment (Kang and Lee, 2005. ), resonator by hole position (Hwang et al, 2008), wood bark particle mats (Kang et al, 2019b), composite particle board (Iswanto et al, 2020;Kang et al, 2015), the oak mushroom bed log (Kang et al, 2008), coconut coir fibers (Nor et al, 2004), bamboo fiber (Koizumi et al, 2002), traditional Koreannatural wallpapers (Jang et al, 2018), undried leaves of evergreen broad-leaved trees (Jung et al, 2020), recycled materials (Lee, 2001) etc.…”

Sound Absorption Property of Traditional Korean Natural Wallpaper (Hanji)

“…(Choi and Bang, 2012;Yoon and Oh, 2005;Huang et al, 2014;Oh and Yoon, 2005), and there are many previous studies on Hanji paper (Yoon et al, 1996;Yoon et al, 1997;Jeong et al, 2004;Jeong et al, 2005). In addition, studies on the improvement of sound absorption performance of wood based materials have been actively carried out (Won et al, 2015;Kang et al, 2015;.…”