Preparation and Sound Absorption Evaluation of PET/Kevlar/PU Foam Composite Boards

Factories have increased the mechanical equipment on a mass scale as a result of quick growth of global industry, and the unbearable sounds that machines create while operating become noise. Therefore, versatility of building materials that are highly correlated to human habitat has been gaining attention. This study combines and then needle-punches fire-retardant polyester (PET) fibers and recycled Kevlar selvages to make PET/Kevlar nonwoven fabrics, which are then combined with Polyurethane (PU) foams, a product yielded after Polyol and Isocyanate (MDI) foam and cure, to form PET/Kevlar/PU foam composite boards. During the process, PET fibers and Kevlar fibers are blended with various ratios and the density of the PU foams is varied. The resilience rate, burst strength, and sound absorption of the resulting composite boards are tested. The test results show that increasing Kevlar selvages can heighten the resilience rate but decreases the burst strength of the composite boards.