Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Techniques S.a.

Compagnie Generale Des Establissements Michelin

Thibaud Pottier

Henri Barguet

Alain Domingo

Jérémy Toussain

Sébastien Rigo

Emmanuel Clement

Jacques Gauthier

Arnaud Letocart

Sandra Boisseau

Brigitte Marie Chauvin

Le Tu Anh Vo

Christian Signoret

Denis Alvarez

Thibault Rapenne

Laurence Ducourant

A metal cord has an M+N construction with two concentric layers. An internal first layer or core includes M wire(s) of diameter d, M having a value from 1 to 4. An external second layer includes N wires of diameter dand is positioned around the core, the N wires being wound in a helix. Between the wires of the two layers are gaps, some or all of which include a filling rubber based on an unsaturated thermoplastic elastomer. The filling rubber may be, for example, based on an SBS or an SIS block copolymer. When used in a molten state, the thermoplastic elastomer presents no problem due to unwanted stickiness if the filling rubber overspills outside the cord after manufacture. The unsaturated and therefore (co)vulcanizable nature of the thermoplastic elastomer makes it compatible with diene rubber matrices used as calendering rubber in metal fabrics intended for reinforcing tires.

Two-layered metal cord rubberized in situ by an unsaturated thermoplastic elastomer

Metal cord (C-) having two layers (Ci, Ce) of 3+N construction, rubberized in situ, comprising an inner layer (Ci) formed from three core wires () of diameter dwound together in a helix with a pitch pand an outer layer (Ce) of N wires () N varying from 6 to 12, of diameter d, which are wound together in a helix with a pitch paround the inner layer (Ci), wherein said cord has the following characteristics (d, d, pand pare expressed in mm): 0.20&#x3c;d&#x3c;0.50; 0.20&#x3c;d&#x3c;0.50; p/p&#x2266;1; 5&#x3c;p&#x3c;30; 10&#x3c;p&#x3c;30; the inner layer is sheathed with a diene rubber composition called a 'filling rubber' () which, for any length of cord of at least 2 cm, is present in the central channel () formed by the three core wires and in each of the gaps lying between the three core wires () and the N wires () of the outer layer (Ce); and the content of filling rubber in the cord is between 5 and 30 mg per g of cord.

In-situ-rubberized layered cord that can be used in a tire belt

A metal cord (C-1) having two layers (Ci, Ce) of 3+N construction, rubberized in situ, comprising an inner layer (Ci) formed from three core wires () of diameter dwound together in a helix with a pitch pand an outer layer (Ce) of N wires () N varying from 6 to 12, of diameter d, which are wound together in a helix with a pitch paround the inner layer (Ci), said cord being characterized in that it has the following characteristics (d, d, pand pbeing in mm): 0.08&#x3c;d&#x3c;0.30; 0.08&#x3c;d&#x2266;0.20; p/p&#x2266;1; 3&#x3c;p&#x3c;30; 6&#x3c;p&#x3c;30; the inner layer is sheathed with a diene rubber composition called a 'filling rubber' () which, for any length of cord of 2 cm or more, is present in the central channel () formed by the three core wires and in each of the gaps lying between the three core wires () and the N wires () of the outer layer (Ce); the content of filling rubber in the cord is between 5 and 35 mg per g of cord. Also disclosed is a multistrand rope comprising at least one two-layer cord, intended in particular for tires of industrial vehicles of the civil engineering type.

In-situ rubberized layered cable for carcass reinforcement for tire

J strands form a core. K outer strands are wound around it in a helix with pitch P, each having a cord with an L wire inner layer of diameter d, and an M wire outer layer of diameter d, wound around the inner layer in a helix with pitch p; with (in mm): 0.10&#x3c;d&#x3c;0.50; 0.10&#x3c;d&#x3c;0.50; 6&#x3c;p&#x3c;30; its inner layer is sheathed with filling rubber; over any length Pof the outer strand, filling rubber is in each of the capillaries delimited by L wires of the inner layer and M wires of the outer layer, and also, when L is equal to 3 or 4, in the central channel delimited by L wires of the inner layer. Filling rubber in said outer strand is 5 to 40 mg per g of strand.

Multi-strand cord in which the basic strands are dual layer cords, rubberized in situ

Metal cord of K&#xd7;(L+M) construction. K elementary strands assembled in a helix, with pitch P, each having a cord with L wire inner layer of diameter d, and M wire outer layer of diameter d, in a helix with pitch paround the inner layer; with (in mm): 0.10&#x3c;d&#x3c;0.50; 0.10&#x3c;d&#x3c;0.50; 3&#x3c;p&#x3c;10; inner layer is sheathed with filling rubber; over a K times Plength of the elementary strand, filling rubber is in each of the capillaries delimited by the L wires of the inner layer and the M wires of the outer layer, and also, when L is equal to 3 or 4, in the central channel delimited by the L wires of the inner layer. The amount of filling rubber in said elementary strand is 5 to 40 mg per g of elementary strand.

Method of manufacturing a metal cord with three concentric layers (C, C, C), of the type rubberized in situ, i.e. incorporating a composition made of rubber in the uncrosslinked state referred to as 'filling rubber', the said cable comprising a first, internal, layer or core (C), around which there are wound together in a helix, at a pitch p, in a second, intermediate, layer (C), N wires of diameter d, N varying from 3 to 12, around which second layer there are wound together as a helix at a pitch p, in a third, outer, layer (C), P wires of diameter d, P varying from 8 to 20, the said method comprising the following steps: a first sheathing step in which the core (C) is sheathed with the filling rubber; a first assembling step by twisting the N wires of the second layer (C) around the core (C) thus sheathed in order to form, at a point named the 'assembling point', an intermediate cord named &#x201c;core strand&#x201d; (C+C); downstream of the said assembling point, a second sheathing step in which the core strand (C+C) is sheathed with the filling rubber; a second assembling step in which the P wires of the third layer (C) are twisted around the core strand (C+C) thus sheathed; a final twist-balancing step.

Method and device for producing a three-layer cord

Method of manufacturing a metal cord with three concentric layers (C, C, C), of the type rubberized in situ, i.e. during its manufacture comprising a first, internal, layer or core (C), around which there are wound together in a helix, at a pitch p, in a second, intermediate, layer (C), N wires of diameter d, N varying from 3 to 12, around which second layer there are wound together as a helix at a pitch p, in a third, outer, layer (C), P wires of diameter d, P varying from 8 to 20, the said method comprising the following steps: a sheathing step in which the core (C) is sheathed with a rubber composition named 'filling rubber', in the uncrosslinked state; an assembling step by twisting the N wires of the second layer (C) around the core (C) thus sheathed in order to form, at a point named the 'assembling point', an intermediate cord named a &#x201c;core strand&#x201d; (C+C); an assembling step in which the P wires of the third layer (C) are twisted around the core strand (C+C); a final twist-balancing step.

In a multi-strand steel cable, at least three layers are present. An inner layer includes from 1 to 4 wires. An intermediate layer surrounds the inner layer and includes from 3 to 12 wires wound together in a helix at a pitch p. An outer layer surrounds the intermediate layer and includes from 8 to 20 wires wound together in a helix at a pitch p. A rubber sheath covers at least the intermediate layer and is formed of a cross-linkable or cross-linked rubber composition that includes at least one diene elastomer.

Three-layered metal cable for tire carcass reinforcement

Method of manufacturing a metal cable having two layers (Ci, Ce) of construction M+N, comprising an inner layer (Ci) having M wires of diameter dwound together in a helix at a pitch p, M varying from 2 to 4, and an outer layer (Ce) of N wires of diameter d, wound together in a helix at a pitch paround the inner layer (Ci), the method comprising the following steps performed in line: a step of assembling the M core wires by twisting to form the inner layer (Ci) at a point of assembling; downstream of the point of assembling of the M core wires, a step of sheathing the inner layer (Ci) with a diene rubber composition called 'filling rubber', in the raw state; a step of assembling the N wires of the outer layer (Ce) by twisting around the inner layer (Ci) thus sheathed; and a step of twist balancing. Also disclosed is a device for implementing such a method.

Method and device for manufacturing a cable comprising two layers of the in situ compound type

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 &#x201c;filling rubber&#x201d; 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.

Method and device for manufacturing a three-layer cord of the type rubberized in situ

The present invention relates to a three-layered metal cable of construction L+M+N usable as a reinforcing element for a tire carcass reinforcement, comprising an inner layer Chaving L wires of diameter dwith L being from 1 to 4, surrounded by an intermediate layer Cof M wires of diameter dwound together in a helix at a pitch pwith M being from 3 to 12, said layer Cbeing surrounded by an outer layer Cof N wires of diameter dwound together in a helix at a pitch pwith N being from 8 to 20, said cable being characterized in that a sheath formed of a cross-linkable or cross-linked rubber composition based on at least one diene elastomer covers at least said layer C. The invention furthermore relates to the articles or semi-finished products made of plastics material and/or rubber which are reinforced by such a multi-layer cable, in particular to tires used in industrial vehicles, more particularly heavy-vehicle tires and their carcass reinforcement plies.

Metal cable having two layers of construction 4+N comprising an inner layer Cof 4 wires of diameter dwound together in a helix at a pitch p, this layer Citself being surrounded by an outer layer Cof N wires of diameter dwound together in a helix at a pitch p, characterized in that said cable furthermore has the following characteristics (d, d, pand pin mm): Such a cable, of preferred construction 4+9, is in particular usable for reinforcing tires, in particular as an anchoring means for a carcass reinforcement of a tire without a solid bead wire.

Wire rope for a tire

Elastic metal/textile composite cord (C-) having two layers (Ci, Ce) of 1+N construction, formed from a core or inner layer (Ci) comprising a textile core thread () of diameter dand a metal outer layer (Ce) of N wires () of diameter dwound together in a helix with a pitch paround the layer Ci, said cord being characterized in that it has the following characteristics (pin mm): As&#x3e;1.0%; At&#x3e;4.0%; Af&#x3e;6.0%; d&#x3e;1.1d; 4&#x3c;p&#x3c;14; and the core thread () is a textile fibre and is embedded in a sheath () of diene elastomer composition, As being the structural elongation of the composite cord, At its total elongation at break, and Af being the elongation at break of the textile fibre. Use of such a cord for the reinforcement of tires, for example in the belt of these tires.

Resilient composite tire cord

A hybrid layered cable for use in tire reinforcement includes a non-metallic internal layer and an unsaturated external layer including 3-12 strands. Each strand is at least partly metallic and is helically wound around the internal layer. Each strand includes at least 3 filaments wound helically together. The cable has a relative elongation at break, measured in tension in accordance with the standard ISO 6892 of 1984, which is higher than 7%.

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Clermont-Ferrand, France

Thibaud Pottier