A low-cost and environmental-friendly microperforated structure based on jute fiber and polypropylene for sound absorption

This work aims to obtain efficient sound absorbing materials in the low and middle frequency. Jute fiber and polypropylene were used to prepare a kind of composite material by mixing-hot pressing process. On this basis, micro-perforated composite materials with various perforation characteristics were fabricated. The effect of drilling diameter, punching ratio, thickness and cavity depth on its acoustic performance was studied. The acoustic-electric analogy model and transfer matrix method of the micro-perforated plate were introduced for analyzing the agreement between the theoretical value and the corresponding experimental results. It was found that the jute fiber reinforced polypropylene microperforated composite had good sound absorbing ability at the low and middle frequencies, and thus had obvious advantages compared with the traditional sound absorption materials. In addition, by properly adjusting the structural parameters, the materials can absorb broadband noise in different frequency ranges to meet diversified needs. Yet with such natural advantages, the microperforated composite we prepared could be promising alternatives in the noise reduction field.