Tire having a composite cord in the tread

1. A pneumatic or non-pneumatic tire comprising a tread,

wherein the tread includes, in at least one internal cavity, a regrooving element formed of a composite cord,

wherein the regrooving element includes an elastomer core and a sheath surrounding the elastomer core, and

wherein the sheath is a hollow cylindrical braid made of first and second sets of fibers that are helically intertwined with each other,

wherein adjacent fibers of the first set are arranged in a generally parallel and non-touching manner, adjacent fibers of the second set are arranged in a generally parallel and non-touching manner, and the fibers of the first set are crisscrossed with the fibers of the second set, and

wherein elastomer bridges mechanically connect the elastomer core to the tread through openings in the braid.

2. The tire according to claim 1 , wherein the intertwined and non-contiguous fibers define, between them, spacings having a relative surface area of between 5% and 30%.

3. The tire according to claim 2 , wherein the relative surface area of the spacings is between 10% and 20%.

4. The tire according to claim 1 , wherein the fibers of the braid are selected from a group consisting of: polyamides, polyesters, polysulphones, poly(phenylene sulphide)s, poly(ether-ketone)s, polyetherimides, poly(amide-imide)s, polyimides, thermoplastic elastomers, mixtures thereof, and alloys thereof.

5. The tire according to claim 4 , wherein the fibers of the braid include polyamides selected from a group of aliphatic polyamides that includes: polyamides 6, polyamides 6,6, and mixtures thereof.

6. The tire according to claim 4 , wherein the fibers of the braid include polyamides selected from a group of semi-aromatic polyamides that includes: poly(meta-xylylene adipamide)s (MXD 6), polyphthalamides, copolyamides thereof, and mixtures thereof.

7. The tire according to claim 4 , wherein the fibers of the braid include polyesters selected from a group that includes: polyethylene terephthalates (PETs), polybutylene terephthalates (PBTs), polycarbonates (PCs), polyethylene naphthalates (PENs), and mixtures thereof.

8. The tire according to claim 4 , wherein the fibers of the braid include thermoplastic elastomers selected from a group that includes: poly(ether-block-amide)s, thermoplastic polyurethanes, ether-ester copolymers (COPEs), and mixtures thereof.

9. The tire according to claim 4 , wherein the fibers of the braid include ether-ester copolymers (COPEs) selected from a group that includes: polyester-ethers and polyester-esters.

10. The tire according to claim 1 , wherein a composition of the elastomer core includes at least one diene elastomer.

11. The tire according to claim 10 , wherein the at least one diene elastomer is selected from a group of elastomers consisting of: polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers, and mixtures thereof.

12. The tire according to claim 10 ,

wherein a composition of the elastomer core includes more than 30 phr (parts by weight per hundred parts of elastomer) of a filler A, and

wherein the filler A includes nanoparticles having a weight-average size of less than 500 nm.

13. The tire according to claim 12 , wherein the filler A includes carbon black.

14. The tire according to claim 12 , wherein the filler A includes an inorganic filler.

15. The tire according to claim 14 , where the inorganic filler is silica.

16. The tire according claim 1 ,

wherein the elastomer core includes at least one thermoplastic elastomer, and

wherein the at least one thermoplastic elastomer is a block copolymer that includes at least one unsaturated elastomer block and at least one thermoplastic block.

17. The tire according to claim 16 , wherein the at least one unsaturated elastomer block is selected from elastomers having a glass transition temperature of less than 25° C.

18. The tire according to claim 16 , wherein the at least one unsaturated elastomer block includes a diene elastomer resulting from isoprene, butadiene, or a mixture thereof.

19. The tire according to claim 16 ,

wherein the at least one thermoplastic block is selected from polymers having a glass transition temperature of greater than 80° C., and

wherein, if the at least one thermoplastic block includes a semi-crystalline thermoplastic block, the at least one thermoplastic block has a melting point of greater than 80° C.

20. The tire according to claim 16 , wherein the at least one thermoplastic block is selected from a group consisting of: polyolefins, polyurethanes, polyamides, polyesters, polyacetals, polyethers, polyphenylene sulphides, polyfluorinated compounds, polystyrenes, polycarbonates, polysulphones, polymethyl methacrylate, polyetherimide, thermoplastic copolymers, and mixtures thereof.

21. The tire according to claim 16 , wherein the at least one thermoplastic block is selected from polystyrenes.

22. The tire according to claim 16 , wherein the at least one thermoplastic elastomer is selected from a group of copolymers consisting of: styrene/butadiene (SB) thermoplastic elastomers, styrene/isoprene (SI) thermoplastic elastomers, styrene/butadiene/isoprene (SBI) thermoplastic elastomers, styrene/butadiene/styrene (SBS) thermoplastic elastomers, styrene/isoprene/styrene (SIS) thermoplastic elastomers, styrene/butadiene/isoprene/styrene (SBIS) thermoplastic elastomers, and mixtures thereof.

23. The tire according to claim 16 , wherein the elastomer core includes only the at least one thermoplastic elastomer as an elastomer thereof.

24. The tire according to claim 16 , wherein the elastomer core further includes one or more non-thermoplastic elastomers at a total content of at most less than 50 phr (parts by weight per hundred parts of elastomer).

25. The tire according to claim 24 , wherein the elastomer core further includes one or more non-thermoplastic elastomers at a total content of at most less than 30 phr (parts by weight per hundred parts of elastomer).

26. The tire according to claim 1 , wherein a greatest dimension of the composite cord in any cross section is between 3 and 20 mm.

27. The tire according to claim 26 , wherein the greatest dimension of the composite cord in any cross section is between 5 and 15 mm.

28. The tire according to claim 1 , wherein the first and second sets of fibers are not adhesively bonded to the tread.