Fabrication of Micro-Perforated Panel made of Polylactic-acid reinforced Oil Palm Empty Fruit Bunch Fibre

This project focus on the fabrication of micro-perforated panel made from oil palm empty fruit bunch fiber-reinforced polylactic-acid with different density, thickness, perforation size, shape, and distance between perforation and study the sound absorption coefficient of the fabricated MPP made of OPEFBF-PLA by simulation through MATLAB

This paper focus on the fabrication of micro-perforated panel (MPP) made of oil palm empty fruit bunch fiber (OPEFBF) reinforced polylactic-acid (PLA). Utilizing OPEFBF as a composite material to fabricate MPP can significantly reduce the carbon footprint and help in reducing the excessive oil palm biomass problem in oil palm production. Other than that, OPEFBF also shown promising sound absorption due to its porosity characteristics. In this paper, the OPEFBF-PLA MPP samples with different designs were created through grinding, sieving, melting, mixing, hot pressing, cold pressing, and laser cutting. The density of OPEFBF-PLA MPP was manipulated in the melt blending process by varying the fiber content of OPEFBF, 5% to 20%, with an increase of 5% weight ratio. In the hot pressing process, the thickness of the OPEFBF-PLA MPP sample was altered by using different thicknesses of mold 1mm, 2mm, and 3mm. In the laser cutting process, the distance between perforation (3 mm, 5 mm, 7 mm), perforation shape (circle, hexagonal, square), and perforation diameter (0.5 mm, 1.0 mm, 1.5 mm) of OPEFBF-PLA MPP were fabricated. Lastly, the sound absorption coefficient of OPEFBF-PLA with different thicknesses, different distances between perforation, and perforation size was analyzed through MATLAB simulation. Simulation results show that the OPEFBF-PLA MPP sample with 1 mm thickness able to achieve sound absorption coefficient of 0.9 at sound frequency around 4500 Hz and OPEFBF-PLA MPP with 0.5 mm perforation size also able to achieve similar results. Whereas, OPEFBF-PLA MPP with 3 mm distance between perforation able to achieve 0.9 sound absorption coefficient at around 5000 Hz sound frequency. This paper contributes a methodology that allows researchers to manipulate different factors of MPP to enhance the sound absorption bandwidth of MPP.

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