Abstract: A sound attenuating trim part, including at least one insulating area with an acoustic mass-spring characteristics having at least a mass layer and a decoupling layer adjacent to the mass layer, whereby the mass layer consists of a porous fibrous layer and a barrier layer, with the barrier layer being located between the porous fibrous layer and the decoupling layer and all layers are laminated together, and whereby the porous fibrous layer at least in the insulating area has adjusted dynamic Young's modulus (Pa) such that the radiation frequency of is at least 3000 (Hz).

Abstract: A sound insulating trim part with acoustic mass-spring characteristics is provided. The sound insulating trim part includes a mass layer and a decoupling layer. The mass layer includes a porous fibrous layer with a dynamic Young's modulus E of at least about 96·AW·t (Pa), with AW being an area weight (g/m2), and t being a thickness (mm) of the porous fibrous layer. The mass layer also includes an air impervious thin barrier layer. The barrier layer is disposed between the porous fibrous layer and the decoupling layer. The barrier layer, the porous fibrous layer, and the decoupling layers are laminated together.

Abstract: 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.

Abstract: A sound attenuating trim part, including at least one insulating area with an acoustic mass-spring characteristics having at least a mass layer and a decoupling layer adjacent to the mass layer, whereby the mass layer consists of a porous fibrous layer and a barrier layer, with the barrier layer being located between the porous fibrous layer and the decoupling layer and all layers are laminated together, and whereby the porous fibrous layer at least in the insulating area has adjusted dynamic Young's modulus (Pa) such that the radiation frequency of is at least 3000 (Hz).

Abstract: 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.

Abstract: A sound insulating trim part with acoustic mass-spring characteristics is provided. The sound insulating trim part includes a mass layer and a decoupling layer. The mass layer includes a porous fibrous layer with a dynamic Young's modulus E of at least about 96·AW·t (Pa), with AW being an area weight (g/m2), and t being a thickness (mm) of the porous fibrous layer. The mass layer also includes an air impervious thin barrier layer. The barrier layer is disposed between the porous fibrous layer and the decoupling layer. The barrier layer, the porous fibrous layer, and the decoupling layers are laminated together.

Abstract: 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.

Abstract: A sound insulating trim part with acoustic mass-spring characteristics is provided. The sound insulating trim part includes a mass layer and a decoupling layer. The mass layer includes a porous fibrous layer with a dynamic Young's modulus E of at least about 96·AW·t (Pa), with AW being an area weight (g/m2), and t being a thickness (mm) of the porous fibrous layer. The mass layer also includes an air impervious thin barrier layer. The barrier layer is disposed between the porous fibrous layer and the decoupling layer. The barrier layer, the porous fibrous layer, and the decoupling layers are laminated together.

Abstract: A sound insulating trim part with acoustic mass-spring characteristics is provided. The sound insulating trim part includes a mass layer and a decoupling layer. The mass layer includes a porous fibrous layer with a dynamic Young's modulus E of at least about 96·AW·t (Pa), with AW being an area weight (g/m2), and t being a thickness (mm) of the porous fibrous layer. The mass layer also includes an air impervious thin barrier layer. The barrier layer is disposed between the porous fibrous layer and the decoupling layer. The barrier layer, the porous fibrous layer, and the decoupling layers are laminated together.

Abstract: 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.