Patent ID: 7257894

Claim:
A process for the production of a single piece panel without a joint, of generally annular shape, said panel comprising a porous core covered on one side with a porous acoustic damping layer and, on an opposing side, with a total acoustic reflector, in which at least said porous layer is emplaced by striping or draping, said porous layer being constituted of parallel strips disposed in a non-touching manner, the edges of said parallel strips being disposed facing a respective one of bands of a perforated sheet, the perforated sheet being selected from the group consisting of metallic sheets and sheets of composite material constituted of a cloth of fibers pre-impregnated with a thermosetting or thermoplastic resin, wherein said parallel strips and said bands of a perforated sheet are first striped or draped on a mold having the shape of the panel to be obtained and said porous core and said total reflector are then emplaced by striping or draping.