| 摘要 |
PURPOSE:To obtain superior sound absorptivity by composing the sound absorber of a laminate of aluminum expanded metal and/or aluminum wire netting and aluminum metal foil, and providing the aluminum metal foil with broken parts. CONSTITUTION:The aluminum(Al) expanded metal 12 and Al metal foil 16 are laminated, and the Al metal foil 16 is provided with the broken parts 18 corresponding to openings 20 of the Al expanded metal 12 entirely or almost regularly. Thus, the broken parts 18 are provided to put the Al metal foil 16 and broken parts 18 in film vibration at the time of sound absorption, and then excellent sound absorptivity is obtained to facilitate the almost regular formation of the broken parts 20 corresponding to the opening parts 20, thereby obtaining the superior sound absorptivity. |
