PROBLEM TO BE SOLVED: To provide an acoustic absorbent which is thinner, lighter, and excellent in sound absorbency with low frequencies.SOLUTION: An acoustic absorbent 100 has a laminate structure sequentially including a penetration layer 10A, a first porous layer 10B, a second penetration layer 20A, and a second porous layer 20B. The first penetration layer has a plurality of through-holes 1a in a thickness direction, the second penetration layer has a plurality of through-holes 2a in a thickness direction, and the first penetration layer has a thickness of less than 1 mm.SELECTED DRAWING: Figure 2
【課題】薄型軽量で低周波の吸音性に優れた吸音材を提供する。【解決手段】吸音材100は、第1穿孔層10Aと第1多孔層10Bと第2穿孔層20Aと第2多孔層20Bをこの順に含む積層構造を有する吸音材であって、第1穿孔層が厚み方向に複数の貫通孔1aを有し、第2穿孔層が厚み方向に複数の貫通孔2aを有し、第1穿孔層の厚みが1mm未満である。【選択図】図2
ACOUSTIC ABSORBENT
吸音材
2018-09-13
Patent
Electronic Resource
Japanese
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 / B60C VEHICLE TYRES , Fahrzeugreifen |