US 12,214,540 B2
Method and line for manufacturing a panel with multiple acoustic elements for an acoustic attenuation structure
Nicolas Pierre Lanfant, Moissy-Cramayel (FR); Hugues Laurent Alglave, Moissy-Cramayel (FR); and Patrick Dunleavy, Moissy-Cramayel (FR)
Assigned to SAFRAN, Paris (FR)
Appl. No. 18/259,189
Filed by SAFRAN, Paris (FR)
PCT Filed Jan. 13, 2022, PCT No. PCT/FR2022/050069
§ 371(c)(1), (2) Date Jun. 23, 2023,
PCT Pub. No. WO2022/157440, PCT Pub. Date Jul. 28, 2022.
Claims priority of application No. 2100483 (FR), filed on Jan. 19, 2021.
Prior Publication US 2024/0042671 A1, Feb. 8, 2024
Int. Cl. B29C 51/22 (2006.01); B29C 33/72 (2006.01); B29C 35/08 (2006.01); B29C 43/46 (2006.01); B29C 51/04 (2006.01); B29C 51/26 (2006.01); B29C 51/42 (2006.01); B29C 51/44 (2006.01); B32B 3/28 (2006.01); B32B 27/08 (2006.01); G10K 11/168 (2006.01); B29L 31/60 (2006.01)
CPC B29C 51/22 (2013.01) [B29C 33/72 (2013.01); B29C 35/0805 (2013.01); B29C 43/46 (2013.01); B29C 51/04 (2013.01); B29C 51/261 (2013.01); B29C 51/426 (2013.01); B29C 51/428 (2013.01); B29C 51/44 (2013.01); B32B 3/28 (2013.01); B32B 27/08 (2013.01); G10K 11/168 (2013.01); B29C 2035/0822 (2013.01); B29C 2043/463 (2013.01); B29L 2031/60 (2013.01); B32B 2307/102 (2013.01); B32B 2307/7376 (2023.05)] 10 Claims
OG exemplary drawing
 
1. A method for continuously manufacturing a complex acoustic multi-element panel for an acoustic attenuation structure comprising a complex acoustic multi-element panel extending following a horizontal direction and a vertical direction and comprised along the vertical direction between a porous acoustic skin and a reflective acoustic skin, said complex acoustic multi-element panel comprising a plurality of complex acoustic elements each having a shape gradually narrowing between a base and a top and a plurality of partitions surrounding each complex acoustic element so as to form a plurality of acoustic cells, said partitions extending following the vertical direction from the base of the complex acoustic elements,
wherein the manufacturing method comprises:
supplying a thermoplastic resin film at the entry of a stamping system comprising at least one pair of complementary cylinders,
heating said thermoplastic resin film upstream of the entry of the stamping system,
performing a passage of said thermoplastic resin film between said at least one pair of complementary cylinders, said pair of complementary cylinders comprising a male cylinder with teeth radially protruding from the male cylinder and a female cylinder with cavities on its radial surface, the cavities of the female cylinder being of shapes complementary to the shapes of the teeth of the male cylinder,
separating the stamped film at the exit of the stamping system using a separator disposed at the exit of the stamping system between the stamped film and the female cylinder, and conditioning the stamped thermoplastic resin film produced at the exit of the stamping system, wherein the conditioning comprises cooling the stamped film using a fresh air intake system located between the stamping system and a conditioning roll, and
forming the complex acoustic multi-element panel.