Method and device for manufacturing a three-layer cord of the type rubberized in situ
AssigneesCompagnie Generale Des Etablissements Michelin, Michelin Recherche et Technique S.A.
InventorsThibaud Pottier, Jeremy Toussain
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Abstract
A device and method for manufacturing a metal cord with three concentric layers, rubberized in situ, of M+N+P construction, wherein the method comprises the following steps which are performed in line: an assembling step by twisting N wires around a first layer to form, at a point named the “assembling point”, an intermediate cord named a “core strand” of M+N construction; downstream of the assembling point, a sheathing step in which the M+N core strand is sheathed with a rubber composition named “filling rubber” in the uncrosslinked state, an assembling step in which P wires of the first layer are twisted around the core strand thus sheathed, and a final twist-balancing step.
Claims19
A method of manufacturing a metal cord with three concentric layers of M+N+P construction, comprising a first, internal, layer having M wires of diameter d1, M varying from 1 to 4, around which there are wound together in a helix, at a pitch p2, in a second, intermediate, layer, N wires of diameter d2′ N varying from 3 to 12, around which there are wound together as a helix at a pitch p3, in a third, outer, layer, P wires of diameter d3, P varying from 8 to 20, the method comprising the following steps which are performed in line:
- an assembling step by twisting the N wires around the first layer in order to form, at a point named the “assembling point”, an intermediate cord named “core strand” of M+N construction;
- downstream of the assembling point, a sheathing step in which the M+N core strand is sheathed with a rubber composition named “filling rubber”, in an uncrosslinked state;
- an assembling step in which the P wires of the third layer are twisted around the core strand thus sheathed;
- and
- a final twist-balancing step.
Dependencies are inferred from the claim text.