Laminated Sound Absorbing Material Including Ultrafine Fiber

摘要

An object of the present invention is to provide a sound absorbing material exhibiting excellent sound absorption in a low frequency region and excellent in space saving. A laminated sound absorbing material comprising a plurality of fiber layers and a base layer present between the fiber layer and the fiber layer, wherein the laminated sound absorbing material comprises at least three fiber layers, each fiber layer consisting of fibers having a fiber diameter of less than 450 nm, 0.1-50 g / m ² weight per unit area, the base layer is weight per unit area of 1 g / m ² or more, thickness is 0.1 mm or more, the base layer is made of non-woven fabric, film, glass fiber and paper It is a laminated sound absorption material which is at least 1 chosen from the group which consists of.