Acoustic baffling element with alternating layers of higher and lower density and porosity

摘要

The element has three sound-absorbing layers (2) or coatings (3) arranged one above the other and made from plastic, where the layers are formed with higher and lower thickness and porosities. The layers or coatings comprise a covering layer with thickness of 5 to 100 mm. A perforated rail is integrated into one of the layers, where the element is designed as a flat module. The covering layer is designed in a surface-treated manner, and has convex and/or concave surface structures with different sizes and geometry, where distance between the surface structures amounts to 5 to 660 mm.