Sound absorption and viscoelastic property of acoustical automotive nonwovens and their plasma treatment |
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Authors: | Youngjoo Na Gilsoo Cho |
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Institution: | (1) CSIR-Central Building Research Institute, Roorkee, 247 667, India |
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Abstract: | Sound absorption property, viscoelastic property and the effect of plasma treatment of four automotive nonwoven fabrics on
these properties are discussed in this research paper. Needle-punched fabrics used for vehicle headliner include 2 polyester
fabrics made of hollow polyester fibers or solid polyester fibers, and 2 polypropylene-composite cellulose fabrics made of
jute fibers or kenaf fibers, manufactured with the same web structure of apparent fabric density and fabric thickness. Hollow
polyester fiber fabric has the highest sound absorption and the highest loss factor, the second highest is jute fiber fabric.
The viscoelastic property is found to be related to the sound absorption property of fabric. The plasma treatment on nonwoven
fabrics changes their sound absorption and viscoelastic property as well as their fabric weight and pore size. Hollow polyester
fabric shows the increased sound absorption and viscoelastic property after the treatment with the increased pore sizes, while
regular polyester fabric displays insignificant changes. The cellulose fabrics are more affected by plasma treatment compared
to the polyester fabrics in terms of fabric weight loss and pore size, and jute fabric is more affected than kenaf fabric
due to fiber weakness. The jute fabric demonstrates the decreased sound absorption and viscoelastic property, while kenaf
fabric shows the increased sound absorption with the unchanged viscoelastic property after the treatment. |
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