Method for producing an annular honeycomb body, and annular honeycomb body

1. A honeycomb body, comprising:

an outer casing tube;

one single metallic layer fastened at least at one fastening point to said outer casing tube, said metallic layer having substantially smooth and structured sections separated from each other by fold lines and folded onto one another, said substantially smooth sections between said fold lines having at least one first section length, said structured sections between said fold lines having at least one second section length differing from said first section length, said sections each having a substantially involute curvature; and

an annular radial partial region with channels through which a fluid can flow.

2. The honeycomb body according to claim 1 , which further comprises an inner casing tube to which said metallic layer is connected at least in partial regions.

3. The honeycomb body according to claim 1 , wherein said sections of said metallic layer are separated by fold lines, every second fold line is situated on one side of said metallic layer and at least one of said fold lines situated on said one side of said metallic layer is connected at least in partial regions to said outer casing tube.

4. The honeycomb body according to claim 1 , wherein said structured sections have structures with a structure repeat length, and said structure repeat length is increased at least at one point of said metallic layer.

5. The honeycomb body according to claim 1 , wherein at least one structured section has at least one recess.

6. The honeycomb body according to claim 5 , wherein said smooth and structured sections have recesses forming a coherent cavity.

7. The honeycomb body according to claim 1 , which further comprises a materially joined connection at said at least one fastening point.

8. The honeycomb body according to claim 1 , which further comprises at least one of the following connections including a materially joined connection:

a) a connection of said metallic layer to an inner casing tube;

b) a connection of said metallic layer to said outer casing tube;

c) a connection of said metallic layer to itself; and

d) a connection of a layer to an adjacent layer of said metallic layer.

9. The honeycomb body according to claim 1 , wherein said structured sections have only one structure amplitude.

10. The honeycomb body according to claim 1 , wherein said metallic layer, with said fold lines separating said sections from each other, has a parallelogram-shaped cross section.

11. A method for producing a honeycomb body, the method comprising the following steps:

providing one single metallic layer with substantially smooth and structured sections separated from each other by fold lines;

providing the substantially smooth sections between the fold lines with at least one first section length and providing the structured sections between the fold lines with at least one second section length differing from the first section length;

providing each of the sections with a substantially involute curvature;

folding the sections of the metallic layer onto one another;

fastening the metallic layer at least at one fastening point to an outer casing tube; and

forming the honeycomb body from the metallic layer with an annular radial partial region having channels through which a fluid can flow.

12. The method according to claim 11 , which further comprises connecting the layer to an inner casing tube, and rotating the casing tubes relative to one another during production.

13. The method according to claim 12 , wherein the connection between the layer and the inner casing tube is detachable.

14. The method according to claim 13 , which further comprises removing the inner casing tube after the rotating step.

15. The method according to claim 11 , which further comprises separating the sections of the layer by fold lines, with every second fold line being situated on one side of the layer and at least one of the fold lines situated on the one side of the layer including at least one fastening point.

16. The method according to claim 11 , which further comprises forming the structures in the layer in a substantially periodic manner, with the structures having a structure repeat length, and with the structure repeat length being increased at least at one point of the layer.

17. The method according to claim 11 , which further comprises forming at least one recess in at least one structured section.

18. The method according to claim 17 , which further comprises forming recesses in the smooth and structured sections to provide a coherent cavity after the folding.

19. The method according to claim 11 , which further comprises delimiting the layer with a structured section being shorter than other sections.

20. The method according to claim 11 , which further comprises fastening the layer at the at least one fastening point by a material joining process.

21. The method according to claim 11 , which further comprises generating at least one of the following connections in a materially joined manner at least in partial regions of the honeycomb body:

a) a connection of the layer to an inner casing tube;

b) a connection of the layer to the outer casing tube;

c) a connection of the layer to itself; and

d) a connection of a layer to an adjacent layer of the layer.