Compagnie Generale Des Etablissements Michelin

Aurelien Tournebize

Bruno Dussardier

Thierry Ablonet

Laurent Huc

Randria Tsilavo

Christophe Egerszegi

Jean-claude Sabatier

Frederic Barriere

Sebastien Lafond

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 mixing and extrusion machine () for the manufacture of rubber mixtures has a mixer with a converging conical twin screw () with a fixed frame () that supports sleeves (). Two screws (), being mounted at an angle, are mounted in the mixer () so as to move in translational movement between an opening () arranged upstream and an outlet () arranged downstream of the sleeves, so that the thread tips of each screw contact tangentially the surfaces of the opposite screw so that the screws remain substantially in contact with each other when the screws rotate at an angle and at a center distance that facilitates self-cleaning. The screw threads maintain tangential contact with the inner surfaces of the sleeves, thus preventing the retention of mixing material on these surfaces.

Mixing and extrusion machine with self-cleaning twin screw and method of use

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

A mixing and extrusion machine () for the manufacture of rubber mixtures includes a mixer with a converging conical twin-screw () with a fixed frame () that supports sleeves (). Two screws (), being mounted at an angle, are mounted in the mixer () in such a way as to move in translational movement between an opening () arranged upstream and an outlet () arranged downstream of the sleeves. The screws are mounted in the sleeves with removable doors including sliding shutters () installed relative to the outlet (). The sliding shutters move linearly between a closed position, in which the sliding shutters prevent the mixer from discharging the mixture, and an open position, in which the sliding shutters prevent discharge of the mixture through the sides of two counter-rotating rollers () of a roller nose type system located just downstream of the outlet.

Output mechanism of a mixer with converging conical twin screws

In the field of tire production, the invention relates to methods and systems for creating unvulcanized rubber batches prior to mixing them in a rubber mixer, including selecting at least one batch for mixing in the mixer, wherein each batch corresponds to a selection of rubber bales (A, B, C) each corresponding to a rubber nature (A, B, C) having predefined characteristics, in order to obtain a proportion corresponding to a predetermined proportion, a target weight to attain a difference between (a) the required weight of the batch and (b) the sum of the weight of the bales (A, B, C) and the weight of the pieces (A, B, C).

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Clermont-Ferrand, France

Aurelien Tournebize