Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Societe Detechnologie Michelin

Bruno Dussardier

Cedric Carlavan

Crescence Weber

Yves Liais

Randria Tsilavo

Henri Hinc

Serge Nicolas

Arnaud Lapra

Christophe Egerszegi

Aurelien Tournebize

Gérard Crosnier

Vincent Pelissier

Stéphane Barjon

Pierre Annet

Floriandre Voisin

Laurent Huc

Aurélien Tournebize

Jean-Marc Loubaresse

Thierry Ablonet

Gérald Huguenot

Julien Loyau

Jacques Rouquet

Frederic Barriere

Christian Beldent

Cédric Carlavan

Sarah Joandel

Frédéric Barriere

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

In the field of mixing rubber mixtures, a rotor (), for use in an internal mixer having a mixing vessel in which the rotor rotates, includes one or more blades (), each blade having a tip () with a profile having a predefined curvature and an anti-wear device detachably fixed to the tip () of at least one blade. The anti-wear device includes a plate () with a profile defined by a lower surface () with a curvature complementary to that of the tip () and an upper surface () with a curvature complementary to that of a wall of the vessel to define, between them, a zone of minimum distance that allows a passage of the mixture between the plate () and the wall of the vessel. One or more fastening systems () are fitted and tightened with respect to the plate () so as to engage the rotor ().

Rotor with anti-wear device and fixation system

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 mixing rubber mixtures, the invention is directed to a rotor () for use in an internal mixer having a mixing vessel in which the rotor rotates, the rotor having one or more blades (), each blade having a tip () with a profile having a predefined curvature; and an anti-wear device detachably fixed to the tip () of at least one blade, the anti-wear device including a plate () with a profile defined by a lower surface () with a curvature complementary to that of the tipand an upper surface () with a curvature complementary to that of a wall of the vessel to define, between them, a zone of minimum distance that allows passage of the mixture between the plate () and the wall of the vessel. The invention is also directed to an internal mixer having at least one mixing vessel in which the disclosed rotor () rotates.

Rotor with anti-wear device and means for attaching same

The process includes a non-crosslinked self-sealing composition which is introduced into an extrusion means, the geometric and thermodynamic characteristics of which have been specially adapted. The speed and temperature conditions of the extrusion means are adjusted so that, at an application nozzle forming the outlet die of the extrusion means, the self-sealing composition is crosslinked. The application nozzle is brought close to the internal surface of the casing previously set in relative motion with respect to the application nozzle, and an extruded and crosslinked bead that has a given width and profile is deposited directly on the internal surface of the casing.

Method for placing a self-sealing product on the inner surface of a tire

Process for the manufacture of a rubber composition comprising various constituents, such as base elastomers, reinforcing fillers, additives and a vulcanization system, during which the following stages are carried out:

Method for manufacturing a rubber composition

A process for manufacturing a continuous strip of self-sealing product having very low hardness, being very elastic and highly tacky, the strip being intended for feeding a converting machine, during which a thermoplastic protective film is deposited on the surface of the strip. The process includes a step during which a strip of self-sealing product P is extruded to a first cross section (S) at the outlet of the extrusion die (). The strip is surrounded over its entire perimeter using a thermoplastic film () by welding the film to itself, after having deposited the film () around the strip. The strip is calendered in order to bring it down to a second cross section (S), smaller in area than the first cross section.

Method and device for making a continuous strip of a highly adhesive product packaged in a thermoplastic film

A viscoelastic material is extruded by kneading-and-conveying screws of different respective diameters positioned coaxially and telescopingly. A flight trough of a larger-diameter screw has radial orifices allowing a first space swept by the flight of the larger-diameter screw to communicate with a second space swept by a flight of a smaller-diameter screw. A fixed cylindrical tube arranged coaxially with the screws is disposed radially between the first and second spaces within the region in which the screws telescope. The tube has radial apertures therethrough to conduct material from the orifices to the second space. The first space is closed off at an axial end thereof by a wall where foreign substances accumulate that do not pass through the orifices. A passage through the wall can be opened to remove the accumulated substances without interrupting the extrusion operation.

Method and device for homogenizing and filtering a viscoelastic material using coaxial telescoping screws

Growing community of inventors

Clermont-Ferrand, France

Bruno Dussardier