To provide a composite sound absorption material which has high sound absorption performance at low to high frequencies of 300 to 2,000 Hz.SOLUTION: A composite sound absorption material 8 includes a synthetic resin film layer 4, a non-woven fabric layer 1 having unevenness, and dry type non-woven fabric layers 7a to 7d, wherein the non-woven fabric layer 1 having the unevenness has fiber density of 50 kg/m3 or more and 500 kg/m3 or less, and is arranged in front of the dry type non-woven fabric layers 7a to 7d when being viewed from a sound injection direction, the dry type non-woven fabric layers 7a to 7d have both flat main surfaces, and one or a plurality of layers of the dry type non-woven fabric layers 7a to 7d exists. Thereby, a vertical incident sound absorption rate at 300 Hz of the composite sound absorption material is 47% or more, and the vertical incident sound absorption rates at 500 Hz, 1,000 Hz and 2,000 Hz are 55% or more, and the composite sound absorption material can cope with road noise of an electric automobile and the like.SELECTED DRAWING: Figure 3

    【課題】300~2000Hzの低~高周波数における吸音性能が高い複合吸音材を提供する。【解決手段】複合吸音材8は、合成樹脂フィルム層4と、凹凸を有する不織布層1と、乾式不織布層7a-7dを含み、凹凸を有する不織布層1は、繊維密度が50kg/m3以上500kg/m3以下であり、音の入射方向から見て乾式不織布層7a-7dの前に配置されており、乾式不織布層7a-7dは両主面がフラットであり、1層又は複数層存在する。これにより、複合吸音材の300Hzにおける垂直入射吸音率が47%以上、500Hz、1000Hz及び2000Hzにおける垂直入射吸音率がそれぞれ55%以上である複合吸音材となり、電気自動車などのロードノイズに対応できる。【選択図】図3


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    Title :

    COMPOSITE SOUND ABSORPTION MATERIAL


    Additional title:

    複合吸音材


    Contributors:

    Publication date :

    2024-05-15


    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 / D04H Herstellen von flächigem Textilgut, z.B. aus Fasern oder fadenförmigem Material , MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL



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