Non-woven fabric for sound-absorbing material, sound-absorbing material, and method for manufacturing non-woven fabric for sound-absorbing material

摘要

An object of the present invention is to provide a sound absorbing nonwoven fabric for a sound absorbing material, a sound absorbing material, and a method for manufacturing a sound absorbing nonwoven fabric having excellent sound absorbing performance in the low frequency region and the high frequency region, excellent in productivity, and excellent in quality. The nonwoven fabric for sound absorbing material of the present invention contains 30 to 80 mass% of monofilament A having a fineness of 0.4 to 0.9 dtex, and 20 to 70 mass% of monofilament B having a fineness of 1.1 to 20.0 dtex, the monofilament A The card passing coefficient shown in the following formula (1) is in the range of 15 to 260. Card passing coefficient = (fineness × strength × √ elongation × √ number of crimps × √ crimp degree) / (fiber length) (1)