Acoustic fibrous decoupler
US11633944B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2018 |
| Grant date | Apr 25, 2023 |
| Priority date | — |
| Expiry date | May 4, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2605/08
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Moulded three-dimensional noise attenuating trim part for a vehicle, comprising at least a three layer system consisting of a first porous fibrous layer and a second porous fibrous layer and an air permeable intermediate film layer situated between the first and second porous fibrous layers and wherein the adjacent surfaces within the three layer system are interconnected, wherein the second porous fibrous layer has an area weight AW2 that is varying over the surface and wherein at least for areas of the three layer system with a total thickness t between 5 and 35 mm, the area weight AW2 relates to the total thickness t of the three layer system as following 25*t+175<AW2<45*t+475 wherein t is in mm and AW2 is in g·m−2 and wherein the area weight AW2 of the second porous fibrous layer is increasing with increasing total thickness t of the three layer system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.