Compagnie Generale Des Etablissements Michelin

Compagnie Generale Des Establissements Michelin

Gael Pataut

Jose Merino Lopez

Sébastien Rigo

David Doisneau

Olivier Reix

Henri Barguet

Laura Luiz

Julien Letessier

Thibault Derouineau

Lucas Lauby

Jos Merino Lopez

The method makes it possible to manufacture an assembly (A) comprising a layer (C) of metal filamentary elements () wound in a helix. The method comprises a step () of supplying a temporary assembly () comprising a layer () of M'>1 metal filamentary elements () and a temporary centre (), and a step () of separating the temporary assembly () between a first split assembly (), a second split assembly () and the temporary centre (). The method comprises a step () of reassembling the first split assembly () with the second split assembly () so as to form the layer (C) of the assembly (A).

Method for separation and reassembly

A multi-strand cord () having a 1×N structure comprises a single layer () of N strands () wound in a helix about a main axis (A), each strand () having one layer () of metal filaments (F) and comprising M>1 metal filaments wound in a helix about an axis (B). The cord () has a total elongation At>8.10% and the energy-at-break indicator Er of the cord (), defined by Er=∫σ(Ai)×dAi where σ(Ai) is the tensile stress in MPa measured at the elongation Ai and dAi is the elongation such that Er is strictly greater than 52 MJ/m.

Single-layer multi-strand cable having improved energy at break and an improved total elongation

A resin composition is based on a resin chosen from the group consisting of unsaturated polyester resins and vinyl ester resins, a crosslinking initiator and a crosslinking agent of general formula R—X—R, in which X is an optionally substituted alkylene group and Rand Rare, independently of one another, an acrylate, methacrylate or vinyl group, an alkenyl group bearing an unsaturated carbon at the chain end, or an alkynyl group bearing an unsaturated carbon at the chain end.

Resin composition comprising a specific crosslinking agent

A process for the manufacture of a reinforced product comprising a matrix based on a composition and at least one reinforcing element, the reinforcing elements being embedded in the matrix, comprises: mixing of the composition based on: a compound A1 with a melting point T1, and a compound A2 with a melting point T2, at a temperature Tm such that: T1≤Tm<T2, so as to dissolve A2 in A1 and to obtain the composition in the liquid state; submerging of the reinforcing element(s) () in the composition; and crosslinking by heating of the composition at a temperature Tn such that: T1≤Tm<Tn.

Method for producing a product reinforced by a reinforcing element

A resin composition is based on a resin selected from the group consisting of vinyl ester resins and unsaturated polyester resins, a crosslinking initiator and a crosslinking agent of general formula (I) in which i is an integer between 2 and 4, X is an i-valent group comprising at least one ring of 6 atoms selected from carbon and nitrogen and comprising at least 2 heteroatoms selected from nitrogen and oxygen, and R is an acrylate group, methacrylate group, vinyl group, alkenyl group bearing an unsaturated carbon at the chain end, or alkynyl group bearing an unsaturated carbon at the chain end.

A cord () comprises a single layer () made up of N helically wound metal filamentary elements () having an outer diameter D, the metal filamentary elements () defining an internal enclosure () of the cord of diameter Dv. Each metal filamentary element () has a diameter Df and a helix radius of curvature Rf. With this cord (), D, Dv, Df and Rf being expressed in millimeters: 0.10≤Jr≤0.25, 9≤Rf/Df≤30, and 1.60≤Dv/Df≤3.20, where Jr=N/(π*(D−Df))×(Dh×Sin(π/N)−(Df/Cos(α×π/180))) and α is the helix angle, expressed in degrees, of each metal filamentary element ().

Highly compressible open reinforcing cord

The method enables the production of a final assembly (A) comprising two layers and comprises a step () of providing a temporary assembly (AT) comprising a temporary core (NT), a step () of separating the temporary assembly (AT) into a first divided assembly (AFI), a second divided assembly (AF), a third divided assembly (AF) and the temporary core (NT). The method comprises a step () of reassembling the first divided assembly (AFI), the second divided assembly (AF) and the third divided assembly (AF) to form the final assembly (A).

Method for separating and reassembling a dual layer assembly

The tire comprises a carcass ply connecting two beads via two sidewalls, the carcass ply being surmounted radially towards the outside of the tire by a crown reinforcing zone which is itself surmounted radially towards the outside of the tire by a tread, the crown reinforcing zone comprising a plurality of reinforcing strips arranged over at least one ply of strips. The strips are arranged so that they are juxtaposed and at an angle less than or equal to 15° with respect to the circumferential direction. Each reinforcing strip is made up of a laminate of at least 3 composite layers, each composite layer containing oriented fibers having a tensile modulus less than or equal to 30 GPa, which are parallel to one another and coated in a polymer matrix.

Tire comprising reinforcing elements in the form of laminated strips

A composition of epoxide-functionalized resins comprises at least a first epoxide-functionalized novolac resin, a second epoxide-functionalized novolac resin, and a curing agent selected from phenolic or amine-type curing agents, the average molar mass of the group consisting of the entirety of the epoxidized novolac resins in the said composition being between 550 and 650 g/mol, the average epoxide functionality of the said group being between 3 and 3.5 eq epoxide/mol, and the said composition having a glass transition temperature Tg of at least 160&#xb0; C.

Epoxy-functionalized novolak resin composition

A non-pneumatic wheel () comprises a crown reinforcing region () itself radially on the inside of a tread (), the crown reinforcing region () comprising a plurality of reinforcing strips () arranged in at least three layers of strips () arranged in such a way that a virtual axis C-C substantially perpendicular to the strips intersects at least two strips in any axial position of the virtual axis in the crown reinforcing region.

Growing community of inventors

Clermont-Ferrand, France

Gael Pataut