| 摘要 |
A sound insulating trim part is provided. The sound insulating trim part includes an absorbing area and an insulating area. The absorbing area includes at least a first portion of a porous fibrous layer. The insulating area includes a mass layer and a decoupling layer. The mass layer includes a second portion of the same porous fibrous layer. The second portion has a dynamic Young's modulus (Pa) of at least about (96·AW·t) with AW being an area weight (g/m2), and t being a thickness (mm) of the porous fibrous layer. The mass layer also includes at least a substantially air impervious barrier layer between the porous fibrous layer and the decoupling layer. The thickness of the first portion of the porous fibrous layer in the absorbing area is larger than the thickness of the second portion of the same porous fibrous layer in the insulating area.
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