NON-WOVEN FABRIC FOR SOUND-ABSORBING MATERIAL, SOUND-ABSORBING MATERIAL, AND METHOD FOR PRODUCING NON-WOVEN FABRIC FOR SOUND-ABSORBING MATERIAL

摘要

Objects of the present invention are to provide a sound-absorbing material nonwoven fabric and a sound-absorbing material that each exhibit excellent sound absorption performance in a low frequency region and a high frequency region and are also excellent in productivity and quality, and to provide a method for producing such a sound-absorbing material nonwoven fabric. A sound-absorbing material nonwoven fabric according to the present invention includes 30 to 80 mass% of short fibers A having a fineness of 0.4 to 0.9 dtex and 20 to 70 mass% of short fibers B having a fineness of 1.1 to 20.0 dtex. A carding passage coefficient of the short fibers A calculated from the following equation (1) is in a range of 15 to 260.