Tampon having spirally shaped grooves

1. A method of producing a tampon, comprising the steps:

providing a single layer tampon blank of tangled fibrous material having a longitudinal axis;

compressing at least narrow lines of an outer circumferential surface of said tampon blank to form a compressed tampon having longitudinal grooves and longitudinal ribs adjacent to said longitudinal grooves, said longitudinal ribs extending radially outward from said tampon blank, said longitudinal grooves and said longitudinal ribs are at least partially spirally shaped, each having an insertion end and a recovery end, and

wherein said tampon is dimensionally stable and has sufficient column strength to be inserted into a body cavity.

2. The method of claim 1 , wherein said tampon blank is radially compressed by a press having press jaws.

3. The method of claim 1 , wherein said narrow lines of compression are each pressed over a circumferential angle of up to at least about 150 degrees of said tampon blank.

4. The method of claim 1 , wherein said tampon blank is compressed such that said fibrous material of said tampon has an essentially uniform density over a cross-section of said tampon.

5. The method of claim 1 , wherein said tampon blank is compressed such that said tampon further comprises a core with a high degree of compression from which relatively uncompressed longitudinal ribs extend radially outward.

6. The method of claim 5 , wherein said tampon blank is compressed such that said longitudinal ribs are at least partially relatively uncompressed compared with said core.

7. The method of claim 5 , wherein said tampon blank is compressed such that said longitudinal ribs extend radially outward at equal circumferential angle intervals and between said insertion end and said recovery end.

8. The method of claim 7 , wherein said tampon blank is pressed to form said tampon having said core, and said outer circumferential surface of said fiber core of said tampon are curved radially outwardly in a barrel-shaped manner.

9. The method of claim 7 , wherein said tampon blank is pressed to form said tampon having said core, and said outer circumferential surface and said fiber core of said tampon are substantially cylindrical.

10. The method of claim 7 , wherein after said pressing of said spiral longitudinal grooves, radially outer ends of said longitudinal ribs are simultaneously subjected to a slight concentric pressure, so that ends of opposite side flanks of adjacent spiral longitudinal ribs are laid on one another and form a soft, closed outer circumferential surface of said tampon, said spiral longitudinal grooves on said outer circumferential surface of said tampon being closed to form liquid guide ducts defined by said longitudinal grooves.

11. A method of producing a tampon, comprising the steps:

providing a single layer tampon blank of tangled fibrous material having a longitudinal axis;

compressing at least one narrow line of an outer circumferential surface of said tampon blank to form a compressed tampon having at least one longitudinal groove and at least one longitudinal rib adjacent said at least one longitudinal groove, said at least one longitudinal rib extending radially outward from said tampon blank, said at least one longitudinal groove and said at least one longitudinal rib are each at least partially spirally shaped, each having an insertion end and a recovery end, wherein said outer circumferential surface is enlarged after said at least one longitudinal groove and at least one longitudinal rib are formed by compression, and

wherein said tampon is dimensionally stable and has sufficient column strength to be inserted into a body cavity.

12. The method of claim 11 , wherein said tampon blank is radially compressed by a press having at least one press jaw.

13. The method of claim 11 , wherein said narrow lines of compression are each pressed over a circumferential angle of up to at least about 150 degrees of said tampon blank.

14. The method of claim 11 , wherein said tampon blank is compressed such that said fibrous material of said tampon has an essentially uniform density over a cross-section of said tampon.

15. The method of claim 11 , wherein said tampon blank is compressed such that said tampon further comprises a core with a high degree of compression from which relatively uncompressed longitudinal ribs extend radially outward.

16. The method of claim 15 , wherein said tampon blank is compressed such that said longitudinal ribs are at least partially relatively uncompressed compared with said core.

17. The method of claim 15 , wherein said tampon blank is compressed such that said longitudinal ribs extend radially outward at equal circumferential angle intervals and between said insertion end and said recovery end.

18. The method of claim 17 , wherein said tampon blank is pressed to form said tampon having said core, and said outer circumferential surface of said fiber core of said tampon are curved radially outwardly in a barrel-shaped manner.

19. The method of claim 17 , wherein said tampon blank is pressed to form said tampon having said core, and said outer circumferential surface and said fiber core of said tampon are substantially cylindrical.

20. The method of claim 17 , wherein after said pressing of said spiral longitudinal grooves, radially outer ends of said longitudinal ribs are simultaneously subjected to a slight concentric pressure, so that ends of opposite side flanks of adjacent spiral longitudinal ribs are laid on one another and form a soft, closed outer circumferential surface of said tampon, said spiral longitudinal grooves on said outer circumferential surface of said tampon being closed to form liquid guide ducts defined by said longitudinal grooves.