PROBLEM TO BE SOLVED: To secure the noise-insulating ability and make the materials lightweight and tin by making a laminated sound absorbing body by laminating at least one layer of a porous sound absorbing member and at least one layer of nonwoven cloth and placing the sound absorbing body between two facing surface boards.
SOLUTION: A laminated sound absorbing body 3 is placed between two surface boards 11, 11 facing each other, and a 3-layer construction is created by placing a nonwoven cloth 2 between two porous sound absorbing members 1. Then, sound wave mainly comprising a high frequency component is efficiently absorbed by the sound absorbing effect possessed by a porous sound absorbing member 1. Also, a strength is secured by using a porous sound absorbing member 1 and a polyvinyl alcohol and an unwoven cloth 2 such as polypropylene and the sound bridge effect is restricted. By doing this, the sound absorbing effect of the laminated sound absorbing body 3 can be effectively realized and further the sound absorbing effect of the porous sound absorbing member 1 can contribute to the transmission loss by using the unwoven cloth 2 in art of the sound absorbing body 3.
【課題】 対向させた２枚の表面板の間に多孔質吸音材 を充填してなる防音パネルにおいて、軽量・薄型・高遮 音性を兼ね備えた防音パネルを提供すること。
【解決手段】 多孔質吸音材と不織布とをそれぞれ少な くとも一層ずつ積層して積層吸音体を形成し、この積層 吸音体を対向させた２枚の表面板の間に充填して防音パ ネルを形成すること。