Compagnie Generale Des Etablissements Michelin

Sabrina Rih

Frédéric Perrin

Gael Roty

Hervé Ferigo

Richard Cornille

Florian Lachal

A tire () comprises a crown () comprising a tread (), a crown reinforcement (), a carcass reinforcement (), two side walls (), two beads (), each side wall () linking each bead () to the crown (), the crown reinforcement () extending in the crown () in a circumferential direction (Z) of the tire (). The textile wire-like hoop reinforcer element (), the wire-like working reinforcer elements () and the wire-like carcass reinforcer elements () are arranged so as to define, in projection on the equatorial circumferential plane (E), a triangular mesh. The textile wire-like hoop reinforcer element comprises a core composed of a first strand comprising at least one monofilament, and a layer comprising at least two second strands, each second strand comprising at least one monofilament, each second strand of the layer being helically wound around the core.

Tire comprising specified hooping ply

The invention relates to a tyre () comprising a hooping ply () comprising at least one textile wire-like hoop reinforcer element making an angle strictly less than 10° with the circumferential direction (Z) of the tyre (). The bonded textile wire-like reinforcer element has, before the step of production of the hooping ply (), a tangent modulus less than or equal to 5 cN/tex/% for any elongation less than or equal to 3%. The textile wire-like hoop reinforcer element has, once extracted from the tyre (), a tangent modulus greater than or equal to 5 cN/tex/% for any elongation greater than or equal to 4%.

Pneumatic tire comprising specified hoop reinforcer element

A method for manufacturing a bonded reinforcing textile filamentary element () comprising a core and a layer of strands is disclosed. The textile filamentary element in the natural state is assembled. A textile filamentary element in the natural state or pre-bonded textile filamentary element is obtained. The filamentary element in the natural state or pre-bonded filamentary element is coated with an external layer of at least one heat-crosslinkable adhesive composition. The filamentary element in the natural state or pre-bonded filamentary element that is coated with the external layer is thermally treated so as to crosslink the adhesive composition in order to obtain the bonded filamentary element (). The steps of coating with and of thermally treating the external layer of the filamentary element in the natural state or pre-bonded filamentary element are carried out such that, for an elongation equal to 30% of the elongation at break of the filamentary element in the natural state, the tangent modulus of the bonded reinforcing textile filamentary element () is increased compared with the tangent modulus of the filamentary element in the natural state.

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Clermont-Ferrand, France

Sabrina Rih