Compagnie Generale Des Etablissements Michelin

Laurent Huc

Bruno Dussardier

Aurelien Tournebize

Christophe Egerszegi

Vincent Tourneux

Thierry Ablonet

Randria Tsilavo

Aurélien Tournebize

Luc Schaffhauser

Frederic Barriere

Frédéric Barriere

A mixing and cooling system () includes a mixing and screw-extrusion machine () with a mixer () having a converging conical twin screw; a ram () that moves along the inside of an introduction hopper () of the machine; a roller nose system disposed just downstream of an outlet () of the mixer to form a sheet () of the mixture exiting the mixer; and a mobile sleeve or sleeves () that move in a linear movement relative to the outlet. The system also includes a cooling system with a spray installation(s) () that delivers water at a predetermined rate to the sheet exiting the machine; a suction installation(s) proportionate to each spray installation; and at least one transport means () that transports the sheet in a predetermined direction.

Temperature management of rubber mixtures discharged from a converging conical twin-screw mixer

A production line () for performing multi-pass mixing sequences of rubber mixtures has at least one first mixing line (A) that produces a masterbatch and at least one second line (B) that performs a final mixing process during a final pass of a multi-pass rubber mixing sequence. A mixing process produces a variety of rubber mixtures in a production line of the type disclosed.

Production of rubber mixtures in a rubber mixture production line incorporating one or more twin-screw mixing and extrusion machines

Tire comprising a tread () extending between an outboard axial edge () and an inboard axial edge (), over a width L, in which the tread comprises at least 4 circumferential ribs (-) separated by grooves (-), in which the circumferential rib () adjacent to the outboard axial edge of the tread extends from the outboard axial edge over a width of at least 0.6&#xb7;L and comprises a portion () with a width of at least 0.1&#xb7;L made from a first rubber composition and an axially adjacent second portion () made from a second rubber composition, the first rubber composition having values for the elastic modulus at 300% deformation, the Shore A hardness and the complex modulus G* at 60&#xb0; C. which are respectively comprised between 1.1 and 2.1 times, 0.95 times and 1.20 times, and 1.00 times and 2.10 times the corresponding values of the second rubber composition.

Tire comprising an improved tread

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Clermont-Ferrand, France

Laurent Huc