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To eliminate or reduce the sound in the buildings, sound insulators are used. In designing the buildings two points should be considered. The absorption and transfer of the sound are as the key points in this connection. Therefore, we should the materials in the buildings which are able to meet our needs to reduce sound pollution. These materials would absorb the sound and reduce it getting into the building. These materials are known as acoustic materials. The nonwovens are one of the most important acoustic materials. This paper reports the effect of different configurations of layers placed in the panels on their NAC.

An investigation and study of the effect of configuration of the layers on the acoustic characteristics of nonwoven panels