| 摘要 |
PROBLEM TO BE SOLVED: To provide a thin, lightweight sound absorbing material having high sound absorbing properties in a low frequency region and exhibiting high sound absorbing effect even with low basis weight. SOLUTION: In the composite sound absorbing material produced by sticking a facing material composed of a laminate nonwoven fabric containing at least one very thin fiber layer and a base material composed of staple fiber nonwoven fabric with a mean apparent density of 0.4-0.8 g/cm<SP>3</SP>to each other, adhesiveness between the facing material and the base material is 0.1 N/10 mm or higher while acoustic absorptivity at a frequency of 1,000 Hz is 50% or more. COPYRIGHT: (C)2010,JPO&INPIT
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