关键词: 针刺非织造材料, 吸声系数, 厚度, 容重

Abstract:

Several needlepunched nonwoven samples are tested through impedance tube methods and some factors affecting the sound absorption properties are discussed， such as fiber type， fiber size， thickness， bulk density， air gap and air permeability. The research results indicate that the thickness and bulk density play more important roles. The relation between thickness and sound absorption coefficient is a positive linear correlation and that between bulk density and sound absorption coefficient is a quadratic correlation under different frequencies.

Key words: needlepunched nonwovens, sound absorption coefficient, thickness, bulk density