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Natural fibres are increasingly being used in construction and building materials in various forms depending upon the desired application. Chopped coir fibres were used to produce fibre beds with different areal densities. The fibres were randomly oriented and bound to each other using polypropylene in powdered form which was melted to provide adhesion. These fibre beds maintained structural integrity and porous structure which are ideal for sound absorption application. The effect of areal density and air cavity was investigated for sound absorption, particularly at low frequencies. It was observed that the areal density has profound effect on noise absorption whereas air cavity affects performance at different frequencies.
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