| 摘要 |
PROBLEM TO BE SOLVED: To provide a thin sound absorbing material which has excellent sound absorbing characteristics in a low spectrum and which can reduce an environmental load.SOLUTION: A sound absorbing material has layers of a laminated body of a nonwoven fabric made of aliphatic polyester which is preferably a polyglycolic acid or a polylactic acid, has other layers as desired, and has a sound absorption peak of 1,100 Hz or less. |
