US 12,264,625 B2
Acoustic attenuation panel and its manufacturing methods
Pierre Caruel, Moissy Cramayel (FR); Bertrand Desjoyeaux, Moissy Cramayel (FR); Bertrand Leroyer, Moissy Cramayel (FR); Marc Versaevel, Moissy Cramayel (FR); and Laurent Georges Valleroy, Moissy Cramayel (FR)
Assigned to Safran Nacelles, Gonfreville l'Orcher (FR)
Filed by Safran Nacelles, Gonfreville l'Orcher (FR)
Filed on Apr. 26, 2022, as Appl. No. 17/729,541.
Application 17/729,541 is a continuation of application No. PCT/FR2020/051947, filed on Oct. 28, 2020.
Claims priority of application No. 19/12265 (FR), filed on Oct. 31, 2019.
Prior Publication US 2022/0250767 A1, Aug. 11, 2022
Int. Cl. F02C 7/045 (2006.01); B32B 3/12 (2006.01); B32B 3/26 (2006.01)
CPC F02C 7/045 (2013.01) [B32B 3/12 (2013.01); B32B 3/266 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for manufacturing an acoustic attenuation panel by a molding tool comprising at least one mold and a counter-mold, the acoustic attenuation panel including a cellular structure comprising a plurality of acoustic cells separated from each other by peripheral partitions, a perforated acoustic structure, the perforated acoustic structure and the cellular structure being formed in a single part in a first material, and a porous acoustic layer formed of a second material, fixed to a surface of the perforated acoustic structure by entanglement of the first material and the second material, the method comprising:
placing a porous acoustic layer in a space located between said at least one mold and the counter-mold;
pinching the porous acoustic layer between said at least one mold and the counter-mold;
injecting a material intended to form a perforated acoustic structure and a cellular structure in one piece in a molding tool;
entangling the material intended to form a perforated acoustic structure and a cellular structure with the material of the porous acoustic layer; and
removing the acoustic attenuation panel formed from the molding tool.