The present invention addresses the problem of providing a sound absorbing material which exhibits excellent sound absorbing performance in low-frequency and intermediate-frequency ranges, and preferably also in higher-frequency ranges. This laminated sound absorbing material includes at least: a fiber layer; and a porous layer, wherein the fiber layer has an average flowrate fine pore diameter of 1.0-60 |am and an air permeability as measured with a Frazier from method of 30-220 cc/cm2·s, and the porous layer comprises at least one selected from the group consisting of foamed resins, unwoven fabrics, and woven fabrics, has a thickness of 3-40 mm and a density of 3-50 kg/m3 which is lower than that of the fiber layer, and is disposed such that the fiber layer is on the sound entry side.
LAMINATED SOUND ABSORBING MATERIAL
LAMINIERTES SCHALLABSORBIERENDES MATERIAL
MATÉRIAU ABSORBANT ACOUSTIQUE STRATIFIÉ
2022-11-23
Patent
Elektronische Ressource
Englisch
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 |
SOUND ABSORBING MATERIAL AND LAMINATED MATERIAL FOR VEHICLES
Europäisches Patentamt | 2017
|Europäisches Patentamt | 2018
|SOUND-ABSORBING OUTER COVERING MATERIAL AND SOUND-ABSORBING MATERIAL
Europäisches Patentamt | 2018
|