Patent ID: 8628635

Claim:
A process for producing a panel for acoustic treatment that comprises an acoustically resistive porous layer, at least one alveolar structure, a reflective layer with openings, and a drainage plate that comprises at least one furrow constructed and arranged to delimit at least one evacuation pipe when said drainage plate is flattened against a free surface of the reflective layer, the process comprising: shaping the reflective layer according to a final geometry of the reflective layer; affixing a demolding film on at least one portion of the free surface of the reflective layer; positioning on the demolding film at least one core whose cross-section is adapted to that of the evacuation pipe in such a way that said at least one core covers the openings of the reflective layer; molding the drainage plate on said demolding film and said at least one core; demolding the drainage plate and removing said at least one core and said demolding film; and making the drainage plate integral with the free surface of the reflective layer; wherein the at least one alveolar structure is disposed between the acoustically resistive porous layer and the reflective layer.