Abstract:

In order to optimize the sound absorption properties of wool nonwoven materials, wool and its hybrid fiber nonwoven materials were prepared from wool, wool/polyester and wool/jute. Using the standing wave tube, the sound absorption properties of wool nonwoven materials in a frequency range of 250 – 6 300 Hz were studied by changing the fiber species, thickness and cavity depth. Results indicated that the average sound absorption coefficient of three samples is not less than 0.2, and sound absorption properties of wool materials are slightly better than those of wool/polyester materials and wool/jute materials. Sound absorption performance of all frequencies(especially low frequencies) also can be improved by increasing the thickness of the material or setting the cavity, in which, thickness supplies much influence on sound absorption coefficients. Taking environmental protection, inexpensive materials and convenient construction into consideration, the 6 mm wool/jute material with a cavity of 6 mm can achieve more excellent sound absorption performance at low frequencies.

Key words: wool, wool/jute, nonwoven material, thickness, cavity, average sound absorption coefficient