| 摘要 |
<p>The present invention relates to a sound-proof material containing a first sound-absorbing material disposed facing a sound source, a first soft sound-insulating layer laminated on a face of the first sound-absorbing material opposite to the sound source and having an air permeability measured in accordance with JIS L1018 of 10 cc/cm 2 ·sec or lower, a second sound-absorbing material laminated on the first soft sound-insulating layer, and a second soft sound-insulating layer laminated on the second sound-absorbing material and having an air permeability measured in accordance with JIS L1018 of 10 cc/cm 2 ·sec or lower and a Young's modulus measured in accordance with JIS K7127 greater than or equal to five times that of the first soft sound-insulating layer, in which at least the second soft sound-insulating layer is partially or entirely bonded to the second sound-absorbing material.</p> |
