| abstract |
An object of the present invention is to provide a thin sound-absorbing material exhibiting excellent sound absorption properties in the low-frequency region, the middle-frequency region, and the high-frequency region. A laminated sound absorbing material comprising a plurality of fiber layers and a base layer positioned between the fiber layer and the fiber layer, wherein the laminated sound absorbing material includes at least two fiber layers, and the fiber layer is made of fibers having an average fiber diameter of 500 nm or more and less than 35 μm. Losing, the neck is 10 to 500 g / m 2 , the air permeability is 950 μm / Pa · sec or less, the thickness is less than 2.9 mm, and the base layer is at least one selected from the group consisting of non-woven and woven fabrics, and the neck is A laminated sound absorbing material characterized in that it is 80 to 800 g / m 2 and has a thickness of 2.9 mm or more and 20 mm or less. |