Abstract
This study compares the airflow resistivity and acoustic properties of fibre-reinforced plastic composites (NFRP) with different mixing ratios of polylactic acid (PLA) and the natural fibres flax and cotton for the application in construction as lightweight structures, car door linings or seat pans. The composites are made from the binder fibre PLA, the bast fibre flax and two different kinds of cotton. Nonwovens are consolidated with a thermoforming process to manufacture the NFRP. The addition of cotton improves the absorption by increasing the number of air pockets (pores) and reducing their shape due to the fineness of the cotton. The airflow resistivity of samples with different mixing ratios were analysed and compared. The airflow resistivity is modelled with different calculation models that use distinct material parameters and the transferability is assessed. Further, the absorption coefficient is analysed and compared to the airflow resistivity. The study shows that there is a dependency of the two parameters.
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