摘要 |
<p>An insulating laminate (120), which is particularly suitable for a sound attenuating barrier, such as a contoured vehicle headliner. The disclosed embodiment includes a finish lamina (28), which may be preferably cloth-like, and a substrate which is preferably structurally stable and self-supporting and which may be adapted to absorb sound primarily at predetermined higher frequencies. In one preferred embodiment, a thin flexible film (50) is located between the finish lamina and the substrate which is adapted to absorb sound primarily at relative lower predetermined frequencies. The film may include a pattern of openings or holes (52) designed to absorb sound primarily at predetermined lower frequencies. In the disclosed embodiment, the substrate includes a porous fiber mat (34), preferably including fibers having a range of thicknesses to improve sound attenuation at higher frequencies, a structural foam lamina (36a) and a reinforcing scrim (38), preferably comprising spunbonded polyester filaments.</p> |