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Author: search.filters.author.Eakvanich, VisitSubject: search.filters.subject.coffee silver skin

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    Item type:Publication,
    Sound Absorption of Natural Fiber Composite from Sugarcane Bagasse and Coffee Silver Skin
    (2023-01-01)
    Kalasee, Wachara
    ;
    Lakachaiworakun, Putipong
    ;
    Eakvanich, Visit
    ;
    Dangwilailux, Panya
    This study aimed to develop a sound-absorbing composite using sugarcane bagasse (SB) and coffee silver skin (CS) as raw materials. The composite boards were manufactured by bonding the fibers with Melamine Urea-Formaldehyde adhesive, ensuring a consistent thickness of 30 mm. Various densities were employed, namely 380, 450, and 520 kg/m<sup>3</sup>. The samples were fabricated with different fiber ratios, including SB100%, SB75% with CS25%, and SB50% with CS50%. The sound absorption coefficient (SAC) and noise reduction coefficient (NRC) were measured using the impedance tube method within a frequency range of 63–6,300 Hz. The experimental results revealed that the mixing ratio of CS exerted a notable influence on enhancing the SAC, while the density of the composite board exhibited a significant impact on increasing both the SAC and NRC. Among the densities tested, the optimal value was observed at 520 kg/m<sup>3</sup>, yielding a SAC value of 0.65 at a frequency of 1,000 Hz and an NRC value of 0.55 for the SB50-CS50 composite plate. These findings underscore the importance of considering the CS mixing ratio and composite board density when aiming to optimize sound absorption properties.