Patent ID: 8708096

Claim:
A method for producing a sound-deadening insert ( 1 ) of a silencer of an exhaust-gas discharge system in an internal-combustion engine of a vehicle; the method being characterized in that it comprises the steps of: providing a flexible mattress ( 5 ) comprising continuous voluminized fibres ( 6 ) of sound-deadening material having a plurality of turns arranged coaxial to each other, the fibres being wound around a winding axis (A); and carrying out one or more needling operations on the mattress ( 5 ) within, respectively, one or more pre-set surface strips of the mattress ( 5 ) itself in such a way as to interweave the continuous fibres ( 6 ) locally so as to obtain, respectively, one or more compacting lines ( 2 ) of compacted fibres ( 6 ), each of which extends without interruption along said mattress ( 5 ) in a direction transverse to the continuous fibres ( 6 ) and keeps the continuous fibres ( 6 ) joined together locally so as to prevent the mattress ( 5 ) from opening up.