Method for producing sound insulation

A method for producing a sound insulation, in particular for floor linings and luggage compartment linings for a motor vehicle, wherein the sound insulation has a wear layer with a surface and/or visible surface layer and a non-woven layer, the mechanical-physical and acoustic properties of which differ over the surface of the sound insulation, preferably zonally and/or partially, comprising the steps of:

• Positioning the nonwoven layer as a blank in a steam/vacuum tool;
• Insertion of a wear layer into the steam/vacuum tool in such a way that a flow-closed side faces the nonwoven layer, wherein the nonwoven layer has a binding element and in particular a binding fiber;
• Close the steam/vacuum tool;
• Applying a vacuum to the upper tool and/or lower tool, which makes it easier to contour the wear layer;
• Applying steam or hot air to the underside of the nonwoven layer, which deforms the wear layer, activates the binding fiber in the nonwoven layer and bonds the wear layer and the nonwoven layer together;
• Reduction of the steam or hot air pressure, in particular through a lower pressure on the wear layer side compared to the pressure on the underside of the nonwoven layer;
• Preferably demolding of the layer composite from the steam/vacuum tool and cooling in the calibration tool or a storage tray.