PROBLEM TO BE SOLVED: To provide a sound absorber that has sound absorbing performance of 0.65 or higher in average sound absorption rate in a frequency range of 800-2,000 Hz and is suitably used for an engine, in an engine room, for a vehicle body, and for an exhaust pipe.SOLUTION: There is provided a sound absorber composed of a fiber layer 20 having a plurality of holes 30 formed to be opened on a top surface. The fiber layer 20 is 3 mm or larger thick, and has an inorganic material layer 40 formed on a top surface thereof, and the holes 30 are each a bottomed hole which penetrates the inorganic material layer 40, and has a bottom part 32 in the fiber layer.SELECTED DRAWING: Figure 1

    【課題】800〜2000Hzの周波数領域における平均吸音率が、0.65以上である吸音性能を有するエンジン、エンジンルーム内、車両ボディ及び排気管に好適な吸音材を提供する。【解決手段】表面に開口した複数の孔30が形成された繊維層20からなる吸音材であって、繊維層20は3mm以上の厚さを有し、繊維層20の表面には、無機材料層40が形成されており、孔30は、無機材料層40を貫通し、かつ、繊維層内部に底部32を有する有底孔である吸音材。【選択図】図1


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    Title :

    SOUND ABSORBER


    Additional title:

    吸音材


    Contributors:

    Publication date :

    2018-10-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES / 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 / F01N GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL , Schalldämpfer oder Auspuffvorrichtungen für Gase von Kraft- und Arbeitsmaschinen oder von Kraftmaschinen allgemein / F02B INTERNAL-COMBUSTION PISTON ENGINES , Brennkraftmaschinen mit innerer Verbrennung mit Verdrängerwirkung



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