Patent application number | Description | Published |
20090065117 | TYRE COMPRISING AN EPOXIDIZED ELASTOMERIC POLYMER AND CROSSLINKABLE ELASTOMERIC COMPOSITION - A tyre includes at least one structural element obtained by crosslinking a crosslinkable elastomeric composition including: (a) a crosslinkable elastomeric base comprising at least 10 phr, preferably from 30 phr to 100 phr, of (a | 03-12-2009 |
20090174103 | Method for extruding a polymeric material and extrusion head therefor - A method for extruding a polymeric material includes the steps of: a) feeding the polymeric material to an extrusion apparatus including an extrusion head, the extrusion head including: a male die; a female die coaxially arranged with respect to the male die; a conveying channel, at least one portion of which is defined between the male die and the female die; and b) adjusting a cross-sectional area of the at least one portion of the conveying channel by reciprocally displacing the female die with respect to the male die in response to an extrusion speed variation of the polymeric material. An extrusion apparatus and a process for manufacturing a tyre which uses the extrusion apparatus, are also disclosed. | 07-09-2009 |
20090247682 | Method for Producing a Crosslinkable Elastomeric Composition - Method for producing a crosslinkable elastomeric composition including: (a) at least one first elastomeric polymer; (b) at least one layered material having an individual layer thickness of 0.01 nm to 30 nm, preferably of 0.05 nm to 15 nm; and (c) at least one vulcanizing agent; includes the following steps: (i) feeding the at least one layered material (b) and at least one second elastomeric polymer (d), into at least one extruder including a housing, at least one screw rotatably mounted in the housing including at least one feed opening and a discharge opening, the at least one layered material being fed into the at least one extruder in an amount higher than or equal to 70 phr; (ii) mixing and softening the mixture so as to obtain a masterbatch; (iii) discharging the obtained masterbatch through a discharge opening; and (iv) mixing the obtained masterbatch with the at least one first elastomeric polymer (a) and the at least one vulcanizing agent (c), to obtain the crosslinkable elastomeric composition, the mixing being carried out in a batchwise manner. | 10-01-2009 |
20110067800 | 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. | 03-24-2011 |
20110110178 | 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. | 05-12-2011 |
20120025430 | 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 | 02-02-2012 |
20120318439 | 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. | 12-20-2012 |
20140042663 | METHOD FOR EXTRUDING A POLYMERIC MATERIAL AND EXTRUSION HEAD THEREFOR - An apparatus for extruding a polymeric material, having an extrusion head which includes a male die, a female die coaxially arranged with respect to the male die, a conveying channel, and at least one portion of which is defined between the male die and the female die. The apparatus further includes a device for adjusting a cross-sectional area of the at least one portion of the conveying channel by reciprocally displacing the female die with respect to the male die in response to an extrusion speed variation of the polymeric material. | 02-13-2014 |