Provided is a sound-absorbing material having sound-absorbing performance such that the average sound absorption coefficient in a frequency domain of 800 to 5000 Hz is 0.70 or greater. This sound-absorbing material comprises a fiber layer in which a plurality of holes opened in the surface are formed, the sound-absorbing material characterized in that the fiber layer has a thickness of 3 mm or greater, an inorganic material layer containing a calcium-based material as the main component is formed in the surface of the fiber layer, the thickness of the inorganic material layer is 0.4 to 0.6 mm, the holes are bottomed holes that pass through the inorganic material layer and that have bottom parts in the fiber layer interior, and the depth of the holes is 50 to 90% of the thickness of the fiber layer.
本发明提供具有在800~5000Hz的频率区域的平均吸音率为0.70以上的吸音性能的吸音材料。本发明的吸音材料是含有纤维层的吸音材料,该纤维层形成有2个以上的在表面开口的孔,该吸音材料的特征在于:上述纤维层具有3mm以上的厚度;在上述纤维层的表面形成有包含钙系材料作为主成分的无机材料层;上述无机材料层的厚度为0.4~0.6mm;上述孔为贯穿上述无机材料层、且在上述纤维层内部具有底部的有底孔;上述孔的深度为上述纤维层的厚度的50~90%。
SOUND-ABSORBING MATERIAL
吸音材料
2021-06-11
Patent
Electronic Resource
Chinese
IPC: | G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / 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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