Tampon having spirally shaped grooves
A tampon for feminine hygiene, having an insertion end, a recovery end, a recovery tape, and a longitudinal axis. The tampon is made of compressed fibrous material and has an outer surface that is at least partially provided with spirally shaped, pressed longitudinal grooves. The grooves define spirally shaped longitudinal ribs. Also disclosed is a method for producing the tampon.
1. Method of producing a digital tampon, comprising the steps:
providing a tampon blank of tangled fibrous material having a longitudinal axis;
compressing at least narrow lines of an outer circumferential surface of the tampon blank to form a compressed tampon having longitudinal grooves that are at least partially spirally shaped having an insertion end and a recovery end; and
wherein the tampon blank is compressed such that the tampon further comprises a core with a high degree of compression from which relatively uncompressed longitudinal ribs extend radially outward.
2. Method as claimed in claim 1 wherein the tampon blank is compressed radially with respect to the longitudinal axis.
3. Method as claimed in claim 1 wherein the tampon blank is compressed such that the fibrous material of the tampon has an essentially uniform density over a cross-section of the tampon.
4. Method as claimed in claim 1 wherein said tampon blank is compressed such that said longitudinal ribs are at least partially relatively uncompressed compared with the core.
5. Method of claim 1 wherein the tampon blank is compressed such that said longitudinal ribs extend radially outward at equal circumferential angle intervals and between the insertion end and the recovery end.
6. The method as claimed in claim 5 , wherein the tampon blank is pressed to form the tampon having a fiber core, and the circumferential surface and fiber core of the tampon are curved radially outwardly in a barrel-shaped manner.
7. The method as claimed in claim 5 , wherein the tampon blank is pressed to form the tampon having a fiber core, and the circumferential surface and fiber core of the tampon are substantially cylindrical.
8. The method as claimed in claim 5 , wherein, after the pressing of the spiral longitudinal grooves, radially outer ends of the 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 circumferential surface of the tampon, the spiral longitudinal grooves on the outer circumferential surface of the tampon being closed to form liquid guide ducts defined by the longitudinal grooves.
9. The method as claimed in claim 5 , further comprising smoothing the spiral longitudinal ribs and spiral longitudinal grooves before being pressed to the final shape of the tampon.
10. The method as claimed in claim 9 , wherein the smoothing is carried out at about 80° to about 120° C.
11. The method as claimed in claim 1 , wherein the narrow lines of compression are each pressed over a circumferential angle of up to at least about 150° of the tampon blank.
12. The method as claimed in claim 11 , wherein the narrow lines of compression are each pressed over a circumferential angle of about 80° to about 120°.
13. The method as claimed in claim 1 , wherein the tampon blank is compressed at room temperature.
14. The method as claimed in claim 13 , wherein the tampon blank is compressed at a temperature of about 80° to about 120° C.