| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sound absorber whose sound absorption performance is effectively improved by laminating an air permeable skin material, and which thus is excellent in sound absorption performance.SOLUTION: Sound absorption performance of a sound absorber changes greatly depending on the combination of a ventilation resistance per unit thickness in an air permeable skin material and a ventilation resistance per unit thickness in an air permeable skin material. When a ventilation resistance per unit thickness in an air permeable skin material is 20 times to less than 2514 times of a ventilation resistance per unit thickness in an air permeable base material, the sound absorption performance of the sound absorber can be effectively improved by laminating the air permeable skin material. The sound absorber is formed by laminating the air permeable skin material on the air permeable base material, and the ventilation resistance per unit thickness in the air permeable skin material is 20 times to less than 2514 times of the ventilation resistance per unit thickness in the air permeable base material.</p> |
