| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound absorbing material which has excellent sound-absorption characteristics for sound with a frequency of approximately 1500-3000 Hz, is superior to flame resisting performance, is lightweight but rigid, and can be manufactured easily.SOLUTION: In a composite non-woven fabric for sound absorbing material, staple fiber non-woven fabrics containing crimp hollow fiber and sound absorption films are laminated. The apparent density of the staple fiber non-woven fabric is 0.013-0.017 g/cm, the thickness of the staple fiber non-woven fabric is 12-21 mm, and the thickness of the sound absorption film is 20-60 μm. |
