Development of Sustainable Lightweight Acoustic Composites from Denim, Flax, and Hemp Fibers

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Abstract

The textile and clothing industries pose a serious problem in terms of environmental sustainability as they are among the sectors that produce the large amounts of waste worldwide. In this context, recycling both pre-consumer and post-consumer clothing waste into composite materials is of great importance in terms of both waste management and materials science. In this study, composite panels were developed using waste denim fabrics with different natural fiber compositions, recycled flax fibers derived from waste linen fabrics, and virgin hemp fibers as reinforcement materials. Polypropylene (PP)/polyethylene (PE) nonwoven interlining waste served as the matrix material, and the panels were fabricated by hot pressing at two different reinforcement-to-matrix ratios. The acoustic properties were evaluated through measurements of the sound absorption coefficient (SAC), noise reduction coefficient (NRC), and sound transmission loss (STL). In the case of denim waste, the results showed that flax- or hemp-blended samples provided better sound absorption than 100% cotton samples, especially at a low matrix ratio. For the rest, while pure flax samples absorbed sound well, pure hemp samples showed good sound barrier properties with high STL.

Keywords:

recycle, denim waste, hemp, flax, linen fabric, cotton, composite, sound absorption, sound insulation

References


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