Abstract: A plurality of strip-like elements is applied onto a forming drum externally having a substantially cylindrical laying surface. The strip-like elements are disposed in mutually approached relationship to form at least one first annular reinforcing layer on the forming drum itself set to a first work diameter at which each of the applied strip-like elements on the laying surface subtends an arc of a circumference of a width as large as a submultiple integer of the overall circumferential extension of the laying surface itself. Adjustment devices operating on the forming drum subsequently carry out expansion of the latter to a second work diameter larger than the first work diameter, while maintaining its laying surface substantially cylindrical.

Abstract: A plurality of strip-like elements is applied onto a forming drum externally having a substantially cylindrical laying surface. The strip-like elements are disposed in mutually approached relationship to form at least one first annular reinforcing layer on the forming drum itself set to a first work diameter at which each of the applied strip-like elements on the laying surface subtends an arc of a circumference of a width as large as a submultiple integer of the overall circumferential extension of the laying surface itself. Adjustment devices operating on the forming drum subsequently carry out expansion of the latter to a second work diameter larger than the first work diameter, while maintaining its laying surface substantially cylindrical.

Abstract: A plurality of strip-like elements is applied onto a forming drum externally having a substantially cylindrical laying surface. The strip-like elements are disposed in mutually approached relationship to form at least one first annular reinforcing layer on the forming drum itself set to a first work diameter at which each of the applied strip-like elements on the laying surface subtends an arc of a circumference of a width as large as a submultiple integer of the overall circumferential extension of the laying surface itself. Adjustment devices operating on the forming drum subsequently carry out expansion of the latter to a second work diameter larger than the first work diameter, while maintaining its laying surface substantially cylindrical.

Abstract: A process for continuously producing an elastomeric composition includes providing at least one extruder, metering and feeding at least one elastomer, at least one filler, and ingredients different from elastomers and fillers into the at least one extruder, mixing and dispersing the at least one filler and the ingredients different from elastomers and fillers into the at least one elastomer using the at least one extruder, and extruding a resulting elastomeric composition. The at least one extruder includes the housing and at least one screw rotatably mounted in the housing. The housing includes at least one feed opening and a discharge opening. At least one of the ingredients different from elastomers and fillers includes a subdivided product including one or more minor ingredients dispersed in at least one thermoplastic binding agent. An apparatus for continuously producing the elastomeric composition is also disclosed.

Abstract: A process for continuously producing an elastomeric composition includes metering at least one elastomer, at least one filler, and at least one minor ingredient; feeding the at least one elastomer, the at least one filler, and the at least one minor ingredient into at least one extruder; mixing and dispersing the at least one filler and the at least one minor ingredient into the at least one elastomer using the at least one extruder; obtaining a subdivided product from a resulting elastomeric composition discharged from the at least one extruder; accumulating an amount of the subdivided product; and stirring the accumulated amount of the subdivided product. An apparatus for continuously producing an elastomeric composition includes at least one extruder, at least one first metering device, at least one second metering device, at least one device for obtaining a subdivided product, and at least one accumulating and stirring device.

Abstract: An apparatus for building pneumatic tyres includes a forming support and an assembling device to assemble components of elastomeric material on the forming support. The assembling device includes a feeding unit to deliver a continuous elongated element of elastomeric material, a conveyor having a moving surface along a predetermined direction and toward a proximal end thereof close to the forming support, and an application device positioned at the proximal end. The continuous elongated element is moved forward on the moving surface as far as the proximal end and the forming support is rotated to enable application of the continuous elongated element in the form of coils wound up on the forming support itself. A retaining device co-operates with the conveyor to brake the continuous elongated element at the end of the application, while the forming support goes on rotating, until it causes stretching and severing of the continuous elongated element.

Abstract: A plurality of strip-like elements is applied onto a forming drum externally having a substantially cylindrical laying surface. The strip-like elements are disposed in mutually approached relationship to form at least one first annular reinforcing layer on the forming drum itself set to a first work diameter at which each of the applied strip-like elements on the laying surface subtends an arc of a circumference of a width as large as a submultiple integer of the overall circumferential extension of the laying surface itself. Adjustment devices operating on the forming drum subsequently carry out expansion of the latter to a second work diameter larger than the first work diameter, while maintaining its laying surface substantially cylindrical.

Abstract: A process and an apparatus for manufacturing tyres for vehicle wheels, includes the step of building on a substantially cylindrical forming support a carcass structure including at least one carcass ply associated, at axially opposite end edges thereof, with respective annular anchoring structures. The step of building the carcass structure further includes the step of associating, at at least one end edge of said at least one carcass ply, at least one reinforcing structure including a predetermined number of reinforcing elements having a predetermined width and same length. The reinforcing elements are preferably obtained by cutting to size, with a predetermined cutting angle, a continuous band-like reinforcing element having a predetermined width. The reinforcing elements are arranged on the end edge of the carcass ply along a deposition path at a distance from one another having a value between 0 and a predetermined value.

Abstract: During building of a tyre, at least one component of elastomeric material is manufactured through application of an elongated element in the form of coils disposed side by side and/or superposed onto a forming support driven in rotation and transversely moved in front of an applicator device. The elongated element is formed by feeding a continuous thread element coming from an extruder between two shaping rollers. During formation, a detector operating close to the shaping rollers cyclically detects the width of the elongated element and the cross-section area of the continuous thread element to monitor the volumetric flow rate of the continuous thread element close to the shaping rollers. The feeding speed of the continuous thread element toward the shaping rollers is adjusted through feedback on the extruder or on a driving device operating downstream of the extruder itself, to keep the volumetric flow rate value within a predetermined range.

Abstract: A process for continuously producing an elastomeric composition includes providing at least one extruder, metering and feeding at least one elastomer, at least one filler, and ingredients different from elastomers and fillers into the at least one extruder, mixing and dispersing the at least one filler and the ingredients different from elastomers and fillers into the at least one elastomer using the at least one extruder, and extruding a resulting elastomeric composition. The at least one extruder includes the housing and at least one screw rotatably mounted in the housing. The housing includes at least one feed opening and a discharge opening. At least one of the ingredients different from elastomers and fillers includes a subdivided product including one or more minor ingredients dispersed in at least one thermoplastic binding agent. An apparatus for continuously producing the elastomeric composition is also disclosed.

Abstract: A process for continuously producing an elastomeric composition includes metering at least one elastomer, at least one filler, and at least one minor ingredient; feeding the at least one elastomer, the at least one filler, and the at least one minor ingredient into at least one extruder; mixing and dispersing the at least one filler and the at least one minor ingredient into the at least one elastomer using the at least one extruder; obtaining a subdivided product from a resulting elastomeric composition discharged from the at least one extruder; accumulating an amount of the subdivided product; and stirring the accumulated amount of the subdivided product. An apparatus for continuously producing an elastomeric composition includes at least one extruder, at least one first metering device, at least one second metering device, at least one device for obtaining a subdivided product, and at least one accumulating and stirring device.

Abstract: System for producing models of tyres which are different from each other, comprising:—a building unit (2) comprising a plurality of operating stations (5, 6, 7, 8, 9), each designed to assemble at least one corresponding structural component on at least one model of tyre being produced;—a vulcanizing unit (3), having vulcanizing moulds (24, 25, 26, 27, 28, 29) for the built tyres;—a unit for producing a plurality of mixtures, comprising at least one extruder unit, which continuously supplies at least one of the said operating stations with at least one mixture suitable for making the said at least one structural component.