Closed mixer working process with stroke-control ram

A closed mixer includes a mixing chamber, a pair of rotors, and a pressing ram. The pressing ram is moveable between a resting condition, which allows introduction of material into the mixing chamber, and a working condition. A method of processing polymer-based mixtures and compounds in the closed mixer includes introducing material into the mixing chamber, moving the pressing ram from the resting condition to an upper end-of-stroke position, and moving the pressing ram from the upper end-of-stroke position to a lower end-of-stroke position. A position-time profile of the pressing ram is controlled during moving the pressing ram from the upper end-of-stroke position to the lower end-of-stroke position.

Multiscrew extruder device with heat exchange structure

A multiscrew extruder device for production of elastomeric compounds is intended for manufacturing tires for vehicle wheels. The device includes a holding body; a mandrel inserted in the holding body extending along a longitudinal axis and delimiting an annular chamber with the holding body; and a plurality of extrusion screws disposed in the annular chamber and parallel to the longitudinal axis. A first circuit for a heat-exchange fluid for temperature control is formed in the mandrel and includes a central channel extending in the mandrel along the longitudinal axis and a plurality of parallel peripheral channels extending in a peripheral portion of the mandrel close to the annular chamber and in fluid communication with the central channel.

MULTI-SCREW EXTRUDER DEVICE FOR THE PRODUCTION OF ELASTOMERIC COMPOUNDS

A multiscrew extruder device for production of elastomeric compounds is intended for manufacturing tyres for vehicle wheels. The device includes a holding body; a mandrel inserted in the holding body extending along a longitudinal axis and delimiting an annular chamber with the holding body; and a plurality of extrusion screws disposed in the annular chamber and parallel to the longitudinal axis. A first circuit for a heat-exchange fluid for temperature control is formed in the mandrel and includes a central channel extending in the mandrel along the longitudinal axis and a plurality of parallel peripheral channels extending in a peripheral portion of the mandrel close to the annular chamber and in fluid communication with the central channel.

PROCESS AND PLANT FOR PRODUCING TYRES

A compound plant for processing elastomeric compounds for tyres with both a high quality and a high throughput includes at least one batch mixing device in combination with at least one multi-shaft continuous mixing device having a high number of shafts. For example, the multi-shaft continuous mixing device could be a ring extruder having a plurality of co-rotating screws disposed to form a ring. In operation, a first elastomeric compound is discharged from the at least one batch mixing device and processed with the at least one multi-shaft continuous mixing device to obtain a second elastomeric compound 171-. (canceled)73. The process according to claim 72 , wherein said at least one batch mixing device is selected from internal mixers and open mixers.74. The process according to claim 72 , wherein mixing in said at least one batch mixing device is carried out at a rotor speed of about 20 rpm to about 60 rpm.75. The process according to claim 74 , wherein mixing in said at least one batch mixing device is carried out at a rotor speed of about 30 rpm to about 50 rpm.76. The process according to claim 72 , wherein mixing in said at least one batch mixing device is carried out using a fill factor of the mixing chamber not higher than about 80%.77. The process according to claim 76 , wherein mixing in said at least one batch mixing device is carried out using a fill factor of the mixing chamber from about 55% to about 70%.78. The process according to claim 72 , wherein said at least one multi-shaft continuous mixing device comprises at least six co-rotating screws.79. The process according to claim 72 , wherein said at least one multi-shaft continuous mixing device comprises at least twelve rotating screws.80. The process according to claim 72 , wherein said rotating screws have a diameter of at least 30 mm.81. The process according to claim 80 , wherein said rotating screws have a diameter of at least 60 mm.82. The process according to claim 72 , wherein said at least ...

Method for processing a crosslinkable elastomeric composition comprising Silica

A method for processing a crosslinkable elastomeric composition including at least one silica reinforcing filler and at least one sulfur-containing organosilane compound by using at least one processing apparatus having an internal metal surface, includes the following steps: (a) pretreating at least one portion of the internal metal surface of the at least one processing apparatus with at least one sulfur-free organosilane compound having at least one hydrolizable group; (b) feeding the crosslinkable elastomeric composition including silica to the at least one processing apparatus; and (c) processing the crosslinkable elastomeric composition.

Closed mixer working process with stroke control ram

The invention relates to the processing, in a closed mixer (1), of polymer-based mixtures and compounds for the manufacture of tyres or components thereof. To improve the dispersion of the ingredients in the polymer base, the pressing ram (8) is lowered to the working condition controlling the position thereof over time, in order to compress the ingredients within the mixing chamber (4). The invention is particularly suitable for the dispersion of reinforcing fillers such as silica or carbon black in the polymer base and the incorporation of said fillers in the latter.

Closed mixer working process with stroke-control ram

The invention relates to the processing, in a closed mixer (1), of polymer-based mixtures and compounds for the manufacture of tyres or components thereof. To improve the dispersion of the ingredients in the polymer base, the pressing ram (8) is lowered to the working condition controlling the position thereof over time, in order to compress the ingredients within the mixing chamber (4). The invention is particularly suitable for the dispersion of reinforcing fillers such as silica or carbon black in the polymer base and the incorporation of said fillers in the latter.

Process and plant for producing tyres

A compound plant for processing elastomeric compounds for tires with both a high quality and a high throughput includes at least one batch mixing device in combination with at least one multi-shaft continuous mixing device having a high number of shafts. For example, the multi-shaft continuous mixing device could be a ring extruder having a plurality of co-rotating screws disposed to form a ring. In operation, a first elastomeric compound is discharged from the at least one batch mixing device and processed with the at least one multi-shaft continuous mixing device to obtain a second elastomeric compound.

METHOD OF MANUFACTURING TYRES AND APPARATUS FOR PRODUCING ELASTOMERIC COMPOUNDS

EXTRUSION PROCESS AND DEVICE FOR PRODUCING ELASTOMERIC COMPOUNDS

An extrusion device for producing elastomeric compounds, includes a holding body internally confining a chamber and at least one extrusion screw disposed in the chamber. The device further includes a plurality of interchangeable extrusion heads alternatively installed on the holding body at a discharge opening of the chamber. The choice of using a type of head rather than another or leaving the discharge opening free is carried out based on the physico-chemical features of the elastomeric compound to be treated, so as to maintain the temperature and/or pressure of the outgoing compound under critical threshold values for such a compound.

Process and plant for producing tyres

A compound plant for processing elastomeric compounds for tires with both a high quality and a high throughput includes at least one batch mixing device in combination with at least one multi-shaft continuous mixing device having a high number of shafts. For example, the multi-shaft continuous mixing device could be a ring extruder having a plurality of co-rotating screws disposed to form a ring. In operation, a first elastomeric compound is discharged from the at least one batch mixing device and processed with the at least one multi-shaft continuous mixing device to obtain a second elastomeric compound.

Method for Processing a Crosslinkable Elastomeric Composition Comprising Silica

A method for processing a crosslinkable elastomeric composition including at least one silica reinforcing filler and at least one sulfur-containing organosilane compound by using at least one processing apparatus having an internal metal surface, includes the following steps: (a) pretreating at least one portion of the internal metal surface of the at least one processing apparatus with at least one sulfur-free organosilane compound having at least one hydrolizable group; (b) feeding the crosslinkable elastomeric composition including silica to the at least one processing apparatus; and (c) processing the crosslinkable elastomeric composition.

PROCESS AND PLANT FOR PRODUCING AN ELASTOMERIC COMPOUND

A process for producing an elastomeric compound, includes: feeding at least one elastomeric polymer and at least one reinforcing filler to a mixing apparatus including at least one batch mixing device; mixing and dispersing, in the at least one mixing apparatus, the at least one reinforcing filler into the at least one elastomeric polymer, so as to obtain a first elastomeric compound; discharging the first elastomeric compound from the at least one mixing apparatus; feeding the first elastomeric compound to at least one continuous mixing device, said continuous mixing device including at least two rotating screws; mixing the first elastomeric compound in the at least one continuous mixing device, so as to obtain a second elastomeric compound; and discharging said second elastomeric compound from said at least one continuous mixing device.

PROCESS AND PLANT FOR PRODUCING TYRES

A compound plant for processing elastomeric compounds for tyres with both a high quality and a high throughput includes at least one batch mixing device in combination with at least one multi-shaft continuous mixing device having a high number of shafts. For example, the multi-shaft continuous mixing device could be a ring extruder having a plurality of co-rotating screws disposed to form a ring. In operation, a first elastomeric compound is discharged from the at least one batch mixing device and processed with the at least one multi-shaft continuous mixing device to obtain a second elastomeric compound. 171-. (canceled)72. A plant for manufacturing a tyre , comprising:a compounding plant capable of being adapted to produce at least one crosslinkable elastomeric compound;at least one manufacturing machine capable of being adapted for preparing a green tyre using a plurality of structural elements;at least one device capable of being adapted for preparing at least one structural element of said plurality of structural elements, wherein said at least one structural element comprises said at least one crosslinkable elastomeric compound; andat least one vulcanization press capable of being adapted to moulding and crosslinking said green tyre to obtain a finished tyre, a mixing apparatus comprising at least one batch mixing device, said mixing apparatus capable of being adapted to produce a first elastomeric compound; and', 'at least one multi-shaft continuous mixing device, said multi-shaft continuous mixing device being a ring extruder and comprising an inner core, an outer housing defining with said inner core an annular chamber, and at least six rotating screws, wherein said ring extruder comprises at least one gas outlet opening provided in said outer housing, said multi-shaft continuous mixing device capable of being adapted to receive said first elastomeric compound and to produce a second elastomeric compound; and', 'a vacuum device configured to apply a vacuum ...

Method of manufacturing tyres and apparatus for producing elastomeric compounds

The present invention relates to a method of manufacturing tyres and an apparatus for producing elastomeric compounds. The apparatus comprises a mixer (1) provided with a pair of rotors (2, 3) housed in a mixing chamber (4) and a pressure piston (7) movable between a raised position spaced apart from the pair of rotors (2, 3) and "r" lower end-of-stroke positions different from each other, which are close to the pair of rotors (2, 3), wherein "r" is equal to or greater than two. Based on the compound to be produced, "q" lower end-of-stroke positions are selected among the possible "r" lower end-of-stroke positions of the pressure piston (7), wherein "q" is equal to or greater than one. During mixing, the pressure piston (7) is moved "m" times from the raised position to the selected "q" lower end-of-stroke positions and vice versa, where "m" is equal to or greater than one.

method for producing tires, apparatus for producing elastomeric compounds, and tire manufacturing plant

Multiscrew extruder device for the production of elastomeric compounds

Process and plant for producing an elastomeric compound

Process for producing an elastomeric compound, comprising: feeding at least one elastomeric polymer (102) and at least one reinforcing filler (103) to a mixing apparatus including at least one batch mixing device (101a),- mixing and dispersing, in said at least one mixing apparatus, said at least one reinforcing filler into said at least one elastomeric polymer, so as to obtain a first elastomeric compound (104); discharging said first elastomeric compound from said at least one mixing apparatus; feeding said first elastomeric compound to at least one continuous mixing device (106), said continuous mixing device comprising at least two rotating screws; mixing said first elastomeric compound into said at least one continuous mixing device, so as to obtain a second elastomeric compound (108); - discharging said second elastomeric compound from said at least one continuous mixing device.

PROCEDURE FOR LOADING A CLOSED MIXER WITH A PRESSURE PISTON.

Procedimiento de procesamiento de mezclas con base de polímero y compuestos en un mezclador cerrado (1) que comprende una cámara de mezcla (4), un par de rotores (2, 3), un pistón de presión (8) dispuesto sobre los rotores, desplazable entre una condición de reposo elevada que permite la introducción de material en el interior de la cámara de mezcla (4) y una condición de trabajo bajada durante la mezcla, comprendiendo el procedimiento las etapas de: - introducir el material en el interior de la cámara de mezcla (4); - introducir por lo menos un relleno de refuerzo de una base de polímero presente en la cámara de mezcla (4); - mover el pistón de presión (8) desde la condición de reposo a una posición superior de final de carrera, correspondiendo dicha posición superior de final de carrera con el punto en el cual el pistón de presión (8) se encuentra con el compuesto; - mover el pistón de presión desde la posición superior de final de carrera a una posición inferior de final de carrera durante la incorporación de dicho por lo menos un relleno de refuerzo en la base de polímero, correspondiendo dicha posición inferior de final de carrera con el punto más bajo que se puede alcanzar mediante dicho pistón de presión (8); - controlar un perfil de la posición a lo largo del tiempo del pistón de presión (8) durante el movimiento del pistón de presión (8) desde la posición superior de final de carrera a la posición inferior de final de carrera para que el pistón de presión (8) alcance la posición inferior de final de carrera al final de la incorporación de dicho por lo menos un relleno de refuerzo en la base de polímero; - introducir plastificadores de la base de polímero procesada en el interior del mezclador después de que el pistón de presión (8) haya alcanzado la posición inferior de final de carrera. Process of processing mixtures based on polymer and compounds in a closed mixer (1) comprising a mixing chamber (4), a pair of rotors (2, 3), a pressure piston (8) arranged ...

Process and plant for producing tyres

A compound plant (100) adapted for processing elastomeric compounds for tyres with both a high quality and a high throughput is disclosed. At least one batch mixing device (101) is put in combination with at least one multi-shaft continuous mixing device (106) having a high number of shafts. For example, the multi-shaft continuous mixing device could be a ring extruder having a plurality of co-rotating screws disposed to form a ring.In operation, a first elastomeric compound (104) is discharged from the at least one batch mixing device (101) and processed with the at least one multi-shaft continuous mixing device (106) to obtain a second elastomeric compound (108).

Method and apparatus of producing tyres

An apparatus for producing elastomeric compounds comprises: a device for reducing an elastomeric compound (4) into small pieces (3) of controlled sizes; a device (5) for continuously feeding the elastomeric compound (4) to an inlet (8) of the device (2) for reducing into small pieces (3); a mixing extruder (6) having an inlet opening (18a) operatively connected with an outlet (16) of the device (2) for reducing into small pieces (3); a device for detecting at least one magnitude value (L, C) indicative of the filling degree of the mixing extruder (6). A control unit (26) operatively connected to the device (2) for reducing into small pieces (3) and the detecting device (25), adjusts the operating speed of the device (2) for reducing into small pieces (3) in such a manner as to maintain said indicative magnitude in the neighbourhood of a predetermined value.

Improvements in or relating to apparatus for providing a visual record ofthe integral ofan electrical signal

Improvements in or relating to electric pulse generators

Improvements in or relating to electric pulse generators

Verfahren zur behandlung einer kieselerde umfassenden, vernetzbaren elastomeren zusammensetzung

Method for processing a crosslinkable elastomeric composition comprising silica

A method for processing a crosslinkable elastomeric composition including at least one silica reinforcing filler and at least one sulfur-containing organosilane compound by using at least one processing apparatus having an internal metal surface, includes the following steps: (a) pretreating at least one portion of the internal metal surface of the at least one processing apparatus with at least one sulfur-free organosilane compound having at least one hydrolizable group; (b) feeding the crosslinkable elastomeric composition including silica to the at least one processing apparatus; and (c) processing the crosslinkable elastomeric composition.