| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound absorbing material reduced in weight and improved in sound absorbing property, and to provide its manufacturing method. SOLUTION: The sound absorbing material comprises an extra fine fiber non-woven cloth B adhered to one surface of an organic fiber non-woven cloth A using a wet hardened resin C and integrally laminated thereon. The organic fiber non-woven cloth A is composed of actually crimped type polyester fibers having a fineness of 1.7-14 dtex, and has an apparent weight of 40-150 g/m<SP>2</SP>. The extra fine fiber non-woven cloth B is composed dominantly of polyolefine fibers having a fineness of 0.5 dtex or lower, and has an apparent weight of 3-18 g/m<SP>2</SP>. The manufacturing method is also provided. COPYRIGHT: (C)2009,JPO&INPIT
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