A standardization system for the manufacture of tires is provided. The same size tire components can be used in the summit of tires having different sizes i.e., tires having different section widths, sidewall heights, and/or aspect ratios. A matrix of tire sizes can be associated with one or more tire summit parameters. The matrix can be used for the manufacture of tires having one or more standardized components by holding substantially constant the value of one or more tire summit parameters across a diagonal of the matrix.

A standardization system for the manufacture of tires is provided. The same size tire components can be used in the summit of tires having different sizes i.e., tires having different section widths, sidewall heights, and/or aspect ratios. A matrix of tire sizes can be associated with one or more tire summit parameters. The matrix can be used for the manufacture of tires having one or more standardized components by holding substantially constant the value of one or more tire summit parameters across a diagonal of the matrix.

A die for a polymer mixing machine includes first and second opposing surfaces. Each defines first cylindrical portions and second V-shaped portions interspaced between each first portion. The first and second opposing surfaces produce a ply with first portions thicker than second portions and throated portions therebetween.

A die for a polymer mixing machine includes first and second opposing surfaces. Each defines first cylindrical portions and second V-shaped portions interspaced between each first portion. The first and second opposing surfaces produce a ply with first portions thicker than second portions and throated portions therebetween.

Provided is a thin film with good durability that is easy to handle during storage and use. The film contains, as a rubber component, at least a copolymer having a conjugated diene unit, a non-conjugated olefin unit, and an aromatic vinyl unit, and having a proportion of a butylene unit of 0 mol %, where a filler content is 15 parts by mass or less with respect to 100 parts by mass of the rubber component, no cross-linking agent is contained, and the thickness is 300 μm or less.

A carcass sleeve is situated in a radially external position with respect to a toroidal forming drum, arranged in a first radially contracted operative condition. The carcass sleeve is shaped according to a toroidal configuration while the forming drum is positioned inside the carcass sleeve. During shaping of the carcass sleeve, the forming drum is radially expanded up to a second radially expanded operative condition. Upon completed shaping, the carcass sleeve is coupled to the forming drum in the second operative condition. The forming drum, coupled to the shaped carcass sleeve, is arranged in proximity to at least one device for building at least one belt layer at a radially external position relative to the shaped carcass sleeve.

A tread support device (10) for a retread process is provided that has a first support roller (12) that rotates about a first support roller axis. A second support roller (16) is present that rotates about a second support roller axis. A third support roller (20) is also included that rotates about a third support roller axis. The first support roller (10), the second support roller (12), and the third support roller (20) all support a tread (24). Also in the tread support device (10), the first support roller axis, the second support roller axis, and the third support roller axis are arranged with respect to one another so as to be located on a circumference of a circle (32).

A tread support device (10) for a retread process is provided that has a first support roller (12) that rotates about a first support roller axis. A second support roller (16) is present that rotates about a second support roller axis. A third support roller (20) is also included that rotates about a third support roller axis. The first support roller (10), the second support roller (12), and the third support roller (20) all support a tread (24). Also in the tread support device (10), the first support roller axis, the second support roller axis, and the third support roller axis are arranged with respect to one another so as to be located on a circumference of a circle (32).

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.

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.