	US 12,083,778 B2
	Soundproofing coating comprising a cellular structure
Charles Cariou, Toulouse (FR)
Assigned to Airbus Operations SAS, Toulouse (FR)
Appl. No. 17/624,458
Filed by Airbus Operations SAS, Toulouse (FR)
PCT Filed Jun. 16, 2020, PCT No. PCT/EP2020/066624 § 371(c)(1), (2) Date Jan. 3, 2022, PCT Pub. No. WO2021/004735, PCT Pub. Date Jan. 14, 2021.
Claims priority of application No. 1907509 (FR), filed on Jul. 5, 2019.
Prior Publication US 2022/0355566 A1, Nov. 10, 2022
Int. Cl. B32B 3/18 (2006.01); B32B 3/12 (2006.01); B64D 33/02 (2006.01); F02C 7/045 (2006.01); F02K 1/82 (2006.01)

CPC B32B 3/18 (2013.01) [B32B 3/12 (2013.01); F02C 7/045 (2013.01); F02K 1/827 (2013.01); B32B 2307/102 (2013.01); B32B 2605/18 (2013.01); B64D 2033/0206 (2013.01)]

11 Claims

1. A soundproofing coating comprising a cellular structure formed in a thickness of the coating between an open first face, permeable to acoustic waves, and a closed second face formed by a closure sheet,

wherein the cellular structure is made up by joining, in a transverse direction, several structures, each of said structures being formed by joining, in the transverse direction, a first longitudinal strip of a first geometry with a second longitudinal strip of a second geometry,

the first strip and the second strip forming a structure being configured so that each structure exhibits successively and repeating in a longitudinal direction:

a first cavity extending between the first face and the second face and open at the first face and of which the cross section narrows progressively between the first face and the second face until said first cavity becomes closed by connection of the first strip and the second strip,

a first joining of two walls belonging respectively to the first strip and to the second strip in contact with one another over part of the thickness of the coating so that a passage is created between the first cavity and a second cavity,

said second cavity, which has a cross section that increases progressively between the first face, at which said second cavity is closed by connection of the first strip and the second strip, and the second face and which is closed at the second face of the coating by the closure sheet, and

a second joining of two walls belonging respectively to the first strip and to the second strip in contact with one another over all or part of the thickness of the coating.

11. A soundproofing coating comprising a cellular structure formed in a thickness of the coating between an open first face, permeable to acoustic waves, and a closed second face formed by a closure sheet,

the first strip and the second strip forming a structure being configured so that each structure exhibits successively and repeating in a longitudinal direction:

said second cavity, which has a cross section that increases progressively between the first face and the second face and which is closed at the first face and at the second face of the coating by the closure sheet, and

a second joining of two walls belonging respectively to the first strip and to the second strip in contact with one another over all or part of the thickness of the coating, and

wherein there are formed:

for each first cavity, the passage between the second cavity and each of the first cavities longitudinally closest to said second cavity, thus placing said first cavities in communication via said second cavity, near the second face of the coating; and

for each second cavity, a duct of cross section equal to or smaller than that of the passage connecting said second cavity to at least one neighboring first cavity, near the first face of the coating.