| 摘要 |
PROBLEM TO BE SOLVED: To provide an acoustic material which is arranged with a perforated plate having lightness in weight, high strength, high impact resistance and excellent sound absorption performance and an acoustic structure for the same. SOLUTION: A perforated material 2 of >=100 N.S/m3 in flow resistance of air per unit area having many fine pores communicating with the front and rear of, for example, the perforated material formed by compression bonding an assemblage of metallic fibers of aluminum, aluminum alloy, stainless steel, etc., by rolling, etc., a porous material formed by successively providing both surfaces or one surface of an assemblage of metallic fibers with net materials (not shown in Figure), such as expanded metals and compression bonding and molding the same are disposed on the back of the perforated plate 1 formed by subjecting metallic plates of, for example, aluminum, stainless steel, iron, etc., to the perforating of <=30% in opening rate. |
