| 摘要 |
PURPOSE:To improve an acoustic damping effect and increase head clearance by providing an acoustic damping corrugated cardboard between its two outer layers. CONSTITUTION:A corrugated cardboard 1 is formed by providing a core 1e between its two outer layers 1a and 1b and an acoustic damping corrugated cardboard 10 is formed by filling the space formed by the outer layers 1a and 1b of this corrugated cardboard 1 and the core 1e with an acoustic damping material 11 made of adhesive glass wool through thermal fusion. The two outer layers 1a and 1b and the core 1e are bonded by this acoustic damping material 11 and small holes 4 are provided in the core 1e and the two outer layers 1a and 1b, respectively. As a result, a sound generated in a car room passes through the small holes 4 of an outer layer 3, a buffering member 2, and the small holes 4 of the lower outer layer 1b of the acoustic damping corrugated cardboard 10, absorbed in the acoustic damping material 1 and attenuated. |
