PROBLEM TO BE SOLVED: To provide a sound absorber suitable for being used for automobiles, maintaining sound absorbency even under high temperature and having average sound absorption coefficient at frequency region of 800 to 2000 Hz of 0.6 or more.SOLUTION: There is provided a sound absorber 1 consisting of a fiber layer 10 and an inorganic material layer 20, in which the fiber layer and the inorganic material layer are in contact, percentage content of a fiber in the fiber layer is over 50 wt.%, the inorganic material layer consists of the fiber and inorganic particles percentage content of the fiber in the inorganic material layer is 50 wt.% or less. There is provided a sound absorber 1, in which density of the fiber layer is smaller than density of the inorganic material layer and density of the inorganic material layer is preferably 3 to 6 g/cm. There is provided a sound absorber, in which the fiber layer consists of 2 or more layers and has thickness of 3 mm or less and thickness of the inorganic material layer is 0.1 mm or more. There is provided a sound absorber, in which the fiber consisting both layers 10 and 20 is each independently an inorganic fiber and consists of one or more inorganic fibers selected from an alumina fiber, an alumina-silica fiber, a silica fiber, a bio-soluble fiber, Dallas wool or rock wool.SELECTED DRAWING: Figure 1
【課題】自動車用に用いることに適した、高温下であっても吸音性が維持され、800〜2000Hzの周波数領域における平均吸音率が0.6以上である吸音性能を有する吸音材〜提供。【解決手段】繊維層10と無機材料層20からなり、繊維層と無機材料層は接しており、繊維層における繊維の含有率が50重量%を超えており、無機材料層は、繊維と無機粒子からなり、無機材料層における繊維の含有率が50重量%以下である吸音材1。繊維層の密度は、無機材料層の密度より小さく、無機材料層の密度は3〜6g/cm3あることが好ましい、吸音材。繊維層は2層以上からなり、厚さが3mm以上あり、無機材料層の厚みが0.1mm以上である吸音材。両層10,20を構成する繊維は各々独立に無機繊維であり、アルミナ繊維、アルミナ−シリカ繊維、シリカ繊維、生体溶解性繊維、ダラスウール又はロックウールから選択される1つ以上の無機繊維からなる吸音材。【選択図】図1
SOUND ABSORBER AND VEHICLE COMPONENT
吸音材及び車両部品
2018-10-18
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 / G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES |
European Patent Office | 2022
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