To provide a thin and lightweight sound absorbing material which has high sound absorbing property in a wide range of low-frequency to middle frequency, specifically, in a frequency range of 1,000 to 4,000 Hz, and has high sound absorbing effect even with low basis weight.SOLUTION: A composite sound absorbing material is obtained by bonding a nonwoven surface material comprising at least one melt-blown extremely fine fiber layer with average fiber diameter 0.3 to 7 μm and basis weight 1 to 40 g/m, and a continuous open cell melamine resin foam layer. In the composite sound absorbing material, thickness of the composite sound absorbing material is 5 to 50 mm, basis weight is less than 50 to 475 g/m, and sound absorption in frequencies 1,000 Hz, 1,600 Hz, 2,000 Hz, 2,500 Hz, 3,150 Hz and 4,000 Hz of sound which is made incident from a nonwoven surface material side in a measuring method of vertical incidence according to JIS-1405 is 50% or more.SELECTED DRAWING: None
【課題】低周波数〜中周波数の広い領域、具体的には、1000〜4000Hzの周波数領域において、高い吸音性を有し、低目付でも吸音効果の高い、薄くて軽量な吸音材の提供。【解決手段】平均繊維径0.3〜7μm、目付け1〜40g/m2のメルトブロー極細繊維層を少なくとも1層含む不織布面材と、連続気泡メラミン樹脂発泡体層とを接合してなる複合吸音材であって、該複合吸音材の厚みが5〜50mm、目付けが50〜475g/m2未満であり、JIS−1405に準拠する垂直入射の測定法における該不織布面材側から入射する音の周波数1000Hz、1600Hz、2000Hz、2500Hz、3150Hz、及び4000Hzにおける吸音率がいずれも50%以上であることを特徴とする前記複合吸音材。【選択図】なし
COMPOSITE SOUND ABSORBING MATERIAL
複合吸音材
2019-03-22
Patent
Elektronische Ressource
Japanisch
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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