Method for improving the coating of a honeycomb body with a catalytically active coating

A method for producing a device for aftertreatment of exhaust gases and for coating a honeycomb body, provided in the device, with a catalytically active surface coating, comprising:

• forming the honeycomb body from a multiplicity of metallic, at least partially structured foils which are stacked one on another and wound so that the honeycomb body forms a multiplicity of flow channels through which fluid can flow along a main flow direction;
• receiving the honeycomb body in an inner casing;
• durably connecting the honeycomb body to the inner casing;
• arranging and durably connecting the inner casing in an outer casing;
• introducing the catalytically active surface coating into the multiplicity of flow channels formed by the honeycomb body;
• and
• filling an air gap or air gaps formed between the outer casing and at least the inner casing with a filler before the introducing the catalytically active surface coating into the multiplicity of flow channels.