| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an acoustic material developing acoustic property equal to or higher than that of a conventional acoustic material by using a material reducing an environmental load. Ž<P>SOLUTION: The acoustic material consists of a fiber structure principally composed of polylactic acid short fiber. An apparent density of the fiber structure is ≥0.01 g/cm<SP>3</SP>. The polylactic acid short fiber is core-sheath composite fiber, where aromatic polyester constitutes the sheath part while polylactic acid constitutes the core and the polylactic acid of the core is arranged eccentrically. The composite fiber develops self-crimping without any application of machine crimping. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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