Acoustic Materials for Industrial Noise Control

Traditionally, synthetic acoustic materials have been used for noise control, but they are costly and hazardous to environment. A recent trend is a shift towards natural fiber porous materials as these are low-cost, biodegradable and recyclable. This paper studies the effect of pre-treatment procedures on the acoustic, thermal and physical properties of jute-based composites. It is found that jute fibers and jute composites have high transmission loss, high sound absorption coefficient, low flammability, low density and high thermal stability. Thus, they are an excellent choice for industrial noise control. The paper also presents some case studies of jute-based noise control in household appliances, and automotive HVAC systems. In every case study, jute composites, applied as sound absorbers and sound barriers, are able to significantly reduce the noise level by 4 dBA or more, and improve the sound quality of the product. Therefore, jute composites have high potential as low-cost, light weight, sustainable materials for industrial noise control.