A study on the new PET composite sound-absorbing material applicable to automotive interior materials

Various types of sound-absorbing materials are used in vehicles according to external noise and conditions. As sound-absorbing materials for automobiles, there are fiber-type materials such as PET fiber or glass fiber, and foam-type materials such as polyurethane. Among them, PET fiber materials have excellent advantages in terms of weight reduction and recycling, but urethane foam is applied due to their low NVH performance and compressive stress. Recently, as interest in eco-friendly vehicles increases, development of sound absorbing materials using PET fiber is required. To improve this problem, in this study, research was conducted on improving sound absorption performance and compression performance by changing the composition ratio of PET fibers constituting the sound absorption material. The acoustic properties were measured by ALPHA-CABIN and BUCK tests