Studies on the Sound Absorption Properties of Paper Attached to Non-woven Fabric and the Specific Role of the Paper in Sound Absorption

Abstract

The results discussed in this paper are for a sound-absorption system consisting of para-aramid paper with many small holes and an air permeability of less than 30 cm³⁄(cm²·s), attached to non-woven material with a density of not more than 0.15 g⁄cm³. A combination of non-woven fabric and para-aramid paper with an air permeability of less than 30 cm³⁄(cm²·s) achieved much better sound absorption than glass wool. Although the sound absorption of the paper attached onto the non-woven fabric (RUBA_®-SA) is similar to that of the micro-perforated-panel (MPP) sound-absorption system, RUBA_®-SA can reduce both of the thickness and the weight of the sound-absorption system. The paper acts as the MPP, while the non-woven fabric plays the role of the air gap at the back of the MPP.