	US 11,987,038 B2
	Acoustic attenuation panel with improved performances in low and medium frequencies
Bernard Troclet, Paris (FR); and Pierre Godart, Foucrainville (FR)
Assigned to ARIANEGROUP SAS, Paris (FR)
Appl. No. 17/271,623
Filed by ArianeGroup SAS, Paris (FR)
PCT Filed Aug. 20, 2019, PCT No. PCT/FR2019/051942 § 371(c)(1), (2) Date Feb. 26, 2021, PCT Pub. No. WO2020/043978, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 1857684 (FR), filed on Aug. 27, 2018.
Prior Publication US 2021/0268767 A1, Sep. 2, 2021
Int. Cl. B32B 3/26 (2006.01); B32B 5/02 (2006.01); B32B 5/18 (2006.01); B32B 5/24 (2006.01); B32B 7/12 (2006.01); B60R 13/08 (2006.01); B61D 17/00 (2006.01); B64C 1/40 (2006.01); G10K 11/168 (2006.01)

CPC B32B 5/245 (2013.01) [B32B 3/266 (2013.01); B32B 5/024 (2013.01); B32B 5/18 (2013.01); B32B 7/12 (2013.01); G10K 11/168 (2013.01); B32B 2262/0276 (2013.01); B32B 2262/062 (2013.01); B32B 2262/148 (2021.05); B32B 2266/0285 (2013.01); B32B 2307/102 (2013.01); B32B 2307/72 (2013.01); B32B 2307/7242 (2013.01); B32B 2419/00 (2013.01); B32B 2605/08 (2013.01); B32B 2605/10 (2013.01); B32B 2605/18 (2013.01); B60R 13/08 (2013.01); B61D 17/005 (2013.01); B64C 1/40 (2013.01)]

11 Claims

1. Acoustic attenuation panel comprising:

a first layer, so-called main layer, made of a porous material and having two opposite faces; and

a second layer, so-called coating layer, disposed on one of the two faces of the main layer;

wherein the main layer is a body made of melamine resin foam having a density between 6 and 6.8 kg/m³and a porosity rate between 0.978 and 0.984,

wherein the coating layer is a fabric having a density between 484 and 526 kg/m³and a porosity rate between 0.771 and 0.817, and

wherein the main layer and the coating layer are assembled one with the other by an adhesive film that is disposed at the interface between the main layer and the coating layer, the adhesive film being a film made of a thermoplastic material provided with through holes and having a surface density between 40 g/m²and 56 g/m².