发明名称 |
SOUND ABSORPTIVE MULTILAYER COMPOSITE |
摘要 |
A sound absorptive multilayer composite having an air-impermeable barrier, an air-permeable reinforcing core having an airflow resistance of at least about 100 mks Rayls and a thickness at least about 1/3 the final composite thickness, an air-permeable open cell foam or fibrous pad having an airflow resistance less than about 2000 mks Rayls and a thickness at least about 1/10 the final composite thickness and a semipermeable airflow-resistive membrane having an airflow resistance of about 500 to about 4000 mks Rayls can provide improved acoustic performance. For example, existing vehicular headliner designs may be improved by adding a properly chosen and properly positioned semipermeable airflow-resistive membrane, a properly chosen and properly positioned air-impermeable barrier, or a properly chosen and properly positioned open cell foam layer. |
申请公布号 |
EP1781466(A1) |
申请公布日期 |
2007.05.09 |
申请号 |
EP20050757686 |
申请日期 |
2005.06.03 |
申请人 |
3M INNOVATIVE PROPERTIES COMPANY |
发明人 |
THOMPSON, DELTON R., JR.;LIU, XIAOHE |
分类号 |
B32B5/18;B01D53/22;B01D67/00;B01D69/02;B32B5/32;B32B27/12;B60R13/08;G10K11/162 |
主分类号 |
B32B5/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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