LAMINATED ACOUSTIC ABSORPTION MEMBER

摘要

The present invention addresses the problem of providing an acoustic absorption member that exhibits exceptional sound absorption properties from a low-frequency range to an ultra-high-frequency range. A laminated acoustic absorption member that includes at least a first fiber layer and a second fiber layer, as well as at least one substrate layer present between the first fiber layer and the second fiber layer, wherein: the first fiber layer has an average flow pore diameter of 0.5-10 µm and a basis weight of 0.1-200 g/m2; the second fiber layer has an average flow pore diameter of 0.5-10 µm, the average flow pore diameter of the second fiber layer being equal to or less than that of the first fiber layer, and also has a basis weight of 0.1-200 g/m2; the substrate layer has an air permeability of 40 cc/cm2·s or greater as measured by the Frazier method, and a basis weight of 1-700 g/m2; and the first fiber layer and the second fiber layer are disposed on a sound-incidence side and a sound-transmission side, respectively.