To provide a thin sound absorber having excellent sound absorbency in a low frequency region, a middle frequency region, and a high frequency region.SOLUTION: A laminated sound absorber comprises at least two fiber layers made of fiber having an average fiber diameter of 500 nm to 35 μm, with a basis weight of 10 to 500 g/m, an air permeability of 950 μm/Pa sec or less, and a thickness of less than 2.9 mm, and a substrate layer made of resin foam located between the fiber layers, with a thickness of 2.9 to 20 mm and a density of 5 to 30 kg/m.SELECTED DRAWING: Figure 1
【課題】低周波数領域、中周波数領域、及び高周波数領域において優れた吸音性を示す薄型の吸音材の提供。【解決手段】平均繊維径が500nm〜35μmである繊維からなり、目付が10〜500g/m2であり、通気度が950μm/Pa・sec以下であり、厚みが2.9mm未満である、少なくとも2層の繊維層と、繊維層の間に位置する、厚みが2.9〜20mmであり、密度が5〜30kg/m3である発泡樹脂からなる基材層とを含む積層吸音材。【選択図】図1
LAMINATED SOUND ABSORBER
積層吸音材
2020-02-06
Patent
Electronic Resource
Japanese
IPC: | B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM , Schichtkörper, d.h. aus Ebenen oder gewölbten Schichten, z.B. mit zell- oder wabenförmiger Form, aufgebaute Erzeugnisse / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR |
NON-WOVEN FABRIC FACE MATERIAL AND LAMINATED SOUND ABSORBER
European Patent Office | 2023
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