Thin reinforced product and tire comprising said product
A reinforced product ( 21 ) comprises: an elastomer matrix ( 23 ), several reinforcing elements ( 44 ) embedded in the elastomer matrix ( 23 ), the reinforcing elements ( 44 ) being arranged side by side in a main direction (X 1 ). Each reinforcing element ( 44 ) comprises: at least one filamentary element ( 46 ) comprising a single monofilament, and at least one sheath coating the filamentary elements ( 46 ) and comprising at least one layer of a thermoplastic polymer composition. The ratio R1=ODO/E of the mean minimum thickness ODO of elastomer present on the back of the sheath to the mean thickness E of the reinforced product ( 21 ) is less than or equal to 0.17, the mean minimum thickness of elastomer ODO and mean thickness E of the reinforced product ( 21 ) being measured in a direction (Y 1 ) substantially perpendicular to the main direction (X 1 ).
1. A tire comprising:
a crown surmounted by a tread;
two sidewalls;
two beads, each sidewall connecting each bead to the crown;
a carcass reinforcement anchored in each of the beads and extending through the sidewalls as far as the crown, and
a crown reinforcement interposed radially between the carcass reinforcement and the tread,
wherein the tire is a passenger vehicle tire, and
wherein the crown reinforcement is a reinforced product comprising:
an elastomer matrix,
several reinforcing elements embedded in the elastomer matrix, the reinforcing elements being arranged side by side in a main direction, each reinforcing element comprising:
at least one filamentary element comprising a single monofilament, and
at least one sheath coating the filamentary elements and comprising at least one layer of a thermoplastic polymer composition,
wherein a mean thickness E of the reinforced product is less than or equal to 0.95 mm;
wherein a pitch P at which the reinforcing elements are laid in the main direction is less than or equal to 1.1 mm;
wherein the ratio R1=ODO/E of the mean minimum thickness ODO of elastomer present on the sheath to the mean thickness E of the reinforced product is less than or equal to 0.17, the mean minimum thickness of elastomer ODO and mean thickness E of the reinforced product being measured in a direction substantially perpendicular to the main direction;
wherein the ratio R2=B/E of the mean minimum thickness B of elastomer separating two successive reinforcing elements in the main direction to the mean thickness E of the reinforced product is less than or equal to 0.3;
wherein each filamentary element has a mean bulk D in the direction substantially perpendicular to the main direction, and wherein the ratio R3=D/E of the mean bulk D to the mean thickness E of the reinforced product is less than or equal to 0.6.
2. The tire according to claim 1 , wherein the ratio R1 is less than or equal to 0.15.
3. The tire according to claim 1 , wherein the mean minimum thickness ODO is less than or equal to 0.17 mm.
4. The tire according to claim 1 , wherein the mean minimum thickness ODO is less than or equal to 0.11 mm.
5. The tire according to claim 1 , wherein the mean thickness E is less than or equal to 0.75 mm.
6. The tire according to claim 1 , wherein the ratio R2=B/E of the mean minimum thickness B of elastomer separating two successive reinforcing elements 44 in the main direction to the mean thickness E of the reinforced product is less than or equal to 0.3.
7. The tire according to claim 1 , wherein the mean minimum thickness B of elastomer separating two successive reinforcing elements in the main direction is less than or equal to 0.5 mm.
8. The tire according to claim 1 , wherein the mean minimum thickness B of elastomer separating two successive reinforcing elements in the main direction is less than or equal to 0.2 mm.
9. The tire according to claim 1 , wherein the pitch P at which the reinforcing elements are laid in the main direction is less than or equal to 0.8 mm.
10. The tire according to claim 1 , wherein the mean thickness G of the sheath on each filamentary element in the direction substantially perpendicular to the main direction ranges from 35 μm to 200 μm.
11. The tire according to claim 1 , wherein each reinforcing element comprises a single filamentary element.
12. The tire according to claim 1 , wherein each reinforcing element comprises several filamentary elements, each comprising a single monofilament and a communal sheath collectively coating the filamentary elements.
13. The tire according to claim 1 , wherein each monofilament is metallic.
14. The tire according to claim 1 , wherein each monofilament has a diameter ranging from 0.10 mm to 0.35 mm.
15. The tire according to claim 1 , wherein each monofilament has a diameter ranging from 0.14 mm to 0.20 mm.
16. The tire according to claim 1 , wherein each filamentary element has a mean bulk D in the direction substantially perpendicular to the main direction, and
wherein the ratio R3=D/E of the mean bulk D to the mean thickness E of the reinforced product is less than or equal to 0.5.
17. The tire according to claim 1 , wherein the thermoplastic polymer composition comprises a thermoplastic polymer, a functionalized diene elastomer, a poly(p-phenylene ether) or a mixture of these materials.
18. The tire according to claim 1 , wherein the sheath is coated with a layer of an adhesive providing adhesion between the sheath and the elastomer matrix.
19. The tire according to claim 1 , wherein the crown reinforcement comprises a working reinforcement comprising the reinforced product and a hoop reinforcement which is interposed radially between the working reinforcement and the tread.
20. The tire according to claim 19 , wherein the hoop reinforcement comprises at least one textile hoop reinforcing element.