Patent ID: 8919495

Claim:
A method for producing a sound-absorbing panel comprising an open-pore support panel having two side surfaces and a cover panel or coating of the support panel, wherein the cover panel or coating is fixedly connected on one of the side surfaces of the open-pore support panel; comprising the method steps of: arranging the sound-absorbing panel with the side surface provided with said cover panel or coating in front of a laser device that emits a laser beam, subjecting the side surface of said panel to the laser beam emitted from the laser, the laser beam being configured to burn away material from the cover panel or coating facing said laser beam over the depth in the direction of the laser beam in a plurality of holes, wherein the laser beam acts on the panel such that the beam waist is focused on a plane parallel a lower face of the cover panel or coating that is opposite to the side on which said laser beam is incident, such that the holes are continuous through the cover panel or coating, and a portion of material is removed from the support panel, such that a lower hole opening is produced in the support panel that extends partly into said open pore support panel, so that the surroundings of the sound-absorbing panel on both side surfaces are connected to the open-pore support panel via an air connection, and wherein the holes passing through the cover panel or coating are terminating in large numbers in the pores of the support panel.