A plant (2) for building tyres comprises a system for managing initial components (3); a system for managing the manufacturing of semi-finished products (4) starting from one or more initial components; a system for managing the building of a green tyre (5) starting from one or more semi-finished products; a system for managing the curing of said green tyre (6). The logical set of a control unit (8) for the plant (2) and/or of one or more from among control units (8a-8e) for the management systems (3-6) and/or of a automatic visual control system (7) is programmed for controlling at least two parameters, assigning to each of these a quality index (I), discarding a tyre being processed when a quality index (I) corresponding to said discard level (5) is assigned to at least one of said parameters and feedbacking the control result of at least one parameter in order to verify the quality index (I) of the parameters.

There is described a plant for building tyres for vehicle wheels, said tyres being of at least two different models, comprising at least a tyre building line (1) which in turn comprises:—a plurality of work stations (4, 4′, 5, 5′, 6, 12, 14) arranged according to a sequential series, each work station (4, 4′, 5, 5′, 6, 12, 14) being adapted for building at least one structural component of each tyre, assembling at least one elementary component;—at least one handling device (3) for the tyres being processed on the respective forming supports associated to each work station (4, 4′, 5, 5′, 6, 12, 14); and—at least one transfer device (2) adapted for transferring the tyre being processed on its forming support from any first work station (4, 4′, 5, 5′, 6, 12, 14) of said sequential series to any other second work station (4, 4′, 5, 5′, 6, 12, 14) not adjacent thereto of said sequential series, so that the tyre being processed on its forming support only passes in said first and second work station (4, 4′, 5, 5′, 6, 12, 14). There are also described a process for manufacturing tyres for vehicle wheels and a method for selecting work stations (4, 4′, 5, 5′, 6, 12, 14) of a tyre building plant.

There is described a plant for building tyres for vehicle wheels, said tyres being of at least two different models, comprising at least a tyre building line (1) which in turn comprises:—a plurality of work stations (4, 4′, 5, 5′, 6, 12, 14) arranged according to a sequential series, each work station (4, 4′, 5, 5′, 6, 12, 14) being adapted for building at least one structural component of each tyre, assembling at least one elementary component;—at least one handling device (3) for the tyres being processed on the respective forming supports associated to each work station (4, 4′, 5, 5′, 6, 12, 14); and—at least one transfer device (2) adapted for transferring the tyre being processed on its forming support from any first work station (4, 4′, 5, 5′, 6, 12, 14) of said sequential series to any other second work station (4, 4′, 5, 5′, 6, 12, 14) not adjacent thereto of said sequential series, so that the tyre being processed on its forming support only passes in said first and second work station (4, 4′, 5, 5′, 6, 12, 14). There are also described a process for manufacturing tyres for vehicle wheels and a method for selecting work stations (4, 4′, 5, 5′, 6, 12, 14) of a tyre building plant.

Method for controlling the symmetry of the footprint area of a tyre miming on a straight trajectory with camber angle different from zero, wherein the method comprises the steps: —reducing the contact pressure of the tyre (2) on the footprint area at an inner shoulder (in case of negative camber) or at an outer shoulder (in case of positive camber); —disposing any medium line (Im) of the tread band (9) placed in correspondence with the footprint area substantially parallel to the ground; the invention also defines a tyre and a wheel for motor-vehicles, wherein the medium line (Im) of the tread hand (9) and the rotation axis (X-X) of the tyre (2) form an angle (a) substantially equal in absolute value to the camber angle (β); the invention also encompasses a process for manufacturing such tyres, wherein a green tyre with symmetric outer profile is deformed during the vulcanising and moulding step until a predetermined angle (a) different from zero is formed between any medium line (Im) of the tread band (9) and the rotation axis (X-X) of the vulcanised tyre (2).

Method for controlling the symmetry of the footprint area of a tyre miming on a straight trajectory with camber angle different from zero, wherein the method comprises the steps: —reducing the contact pressure of the tyre (2) on the footprint area at an inner shoulder (in case of negative camber) or at an outer shoulder (in case of positive camber); —disposing any medium line (Im) of the tread band (9) placed in correspondence with the footprint area substantially parallel to the ground; the invention also defines a tyre and a wheel for motor-vehicles, wherein the medium line (Im) of the tread hand (9) and the rotation axis (X-X) of the tyre (2) form an angle (a) substantially equal in absolute value to the camber angle (β); the invention also encompasses a process for manufacturing such tyres, wherein a green tyre with symmetric outer profile is deformed during the vulcanising and moulding step until a predetermined angle (a) different from zero is formed between any medium line (Im) of the tread band (9) and the rotation axis (X-X) of the vulcanised tyre (2).

3D printers may fabricate tires with graphene-based materials. Biopolymers may be used to produce graphene foam. Molten salt synthesis with metallic powders may produce coatings for the foam to protect the tires from oxidation. Graphene oxide sheet may also be applied to the tire structure using an inexpensive bio-adhesive.

3D printers may fabricate tires with graphene-based materials. Biopolymers may be used to produce graphene foam. Molten salt synthesis with metallic powders may produce coatings for the foam to protect the tires from oxidation. Graphene oxide sheet may also be applied to the tire structure using an inexpensive bio-adhesive.

A green tyre (2) for bicycles is built, comprising at least one carcass ply (4) having axially opposite end flaps (4a) engaged with respective bead cores (5) and a tread band (6) applied in a radially outer position around said at least one carcass ply (4). The green tyre (2) removed from the building drum, is profiled so as to translate the tread band (6) in a radially outer direction with respect to the bead cores (5), so as to impart a cross-sectional convex profile to the tyre (2) in a radially outer direction. The profiled tyre is engaged by means of a transfer member (31) while the tyre itself is mechanically restrained so as to maintain at least partly said cross-sectional convex profile in the radially outer direction.

Disclosed is an extruder and a method for extruding cord reinforced tire components, wherein the extruder includes an extruder head with a die and a cord guide, wherein the die is provided with a cross sectional profile that defines a first cross section of the extrusion material in the die, wherein the cross sectional profile has a profile height, wherein the cord guide is arranged for guiding the cords into the die at a cord entry height, wherein the extruder head is provided with first heating elements, wherein the extruder comprises a control unit that is operationally connected to the first heating elements for generating an adjustable height temperature gradient in the extrusion material across the profile height to control swelling of the extrusion material relative to the cord entry height from the first cross section to a second cross section after the extrusion material leaves the die.

A green tyre (2) for bicycles is built, comprising at least one carcass ply (4) having axially opposite end flaps (4a) engaged with respective bead cores (5) and a tread band (6) applied in a radially outer position around said at least one carcass ply (4). The green tyre (2) removed from the building drum, is profiled so as to translate the tread band (6) in a radially outer direction with respect to the bead cores (5), so as to impart a cross-sectional convex profile to the tyre (2) in a radially outer direction. The profiled tyre is engaged by means of a transfer member (31) while the tyre itself is mechanically restrained so as to maintain at least partly said cross-sectional convex profile in the radially outer direction.