In each protrusion-forming recess of a mold, a non-through-hole vent is provided at one end side, and a through-hole vent that is longer than the non-through-hole vent is provided at another end side. When there is an ingress of rubber of a green tire into each protrusion-forming recess, air inside the protrusion-forming recess is discharged through the through-hole vent and the minute amount of air remaining inside escapes to the non-through-hole vent. Each through-hole vent is set with a large capacity, enabling an ingress of rubber into the vent hole that will later become spew to be stopped inside the through-hole vent. Since the volume of air that is trapped inside the protrusion-forming recess is a minute amount, and so the volume of air that escapes into the non-through-hole vent is also a minute amount.

An insert for a mould for vulcanising tyres for vehicle wheels, the insert arranged to receive in a seat formed on a moulding surface of the mould and comprising a base surface from which a plurality of projections extends; wherein, each projection comprises a lateral surface extending away from the base surface such that the lateral surface defines a tapered profile of the projection away from the base surface, is inclined at an angle between 10 and 25 with respect to a direction perpendicular to the base surface, and has a roughness between 4 and 11 m.

A tire made of rubbery material comprising a sidewall (3). The sidewall (3) comprises at least one coded matrix symbol (4), the coded matrix symbol (4) comprising dark parts and light parts, the dark parts being made up of a texture formed as an integral part of the sidewall (3) and contrasting against the rest of the tire (1). The texture is an organized arrangement of a plurality of elements (401, 402, 403, 404, 405, 411, 414).

A distribution unit (U) for distribution carbonaceous particulate material, in particular powdered rubber or equivalent material to be applied on the peripheral surfaces (F) of a tire (P), comprises nozzle spreading means (2) for spreading said particulate material and pneumatic supply means (1,3,5,7) for feeding said particulate material to said spreading means (2).

A mold for vulcanizing and molding a tire, this tire having a tread delimited by two sidewalls, the mold having a ring for molding the tread of the tire and two shells for molding the sidewalls, the mold having an annular groove extending in a recessed manner in one of the shells and an insert housed in the groove, this insert including at least one groove which is concentric with the insert and provided with a section that decreases in the depthwise direction of the groove.

A tire or other rubber item is described that has a surface such as a sidewall. A region on the surface includes a plurality of protrusions. The protrusions are positioned in a pseudo-random pattern within the region. Various features of the protrusions may be varied in a random or pseudo-random manner.

One embodiment of the invention includes a method for imparting a unique identifier to a molded polymeric article. The method includes providing a label comprising indicia having a thickness effective for embossing the polymeric article during molding and a melting point greater than the melting point of the molded polymeric article. The method also includes attaching the label to the article prior to vulcanization. The method further includes vulcanizing the article so that indicia emboss the molded polymeric article by forming indentations in the molded polymeric article.

The invention relates to a vehicle tire comprising a tread provided for contacting the road surface, and two sidewalls which adjoin the tread. At least one sidewall has an identifier region. The identifier region comprises a multiplicity of identifier grooves which extend in the sidewall of the vehicle tire (10). The identifier grooves have in each case one inner corrugation having a multiplicity of elongate elevations and/or depressions which in the interior of the identifier grooves run transversely to the longitudinal direction of the identifier grooves. The elongate elevations and depressions, conjointly with the longitudinal direction of the identifier grooves, include in each case an angle in the range of 20 to 90.

A tire includes a pattern region at least on a part of an outer surface of a sidewall of the tire, the pattern region being visually recognizable as being different from a perimeter of the part. The pattern region includes a plurality of projections projecting from a reference surface of the pattern region. Each of the plurality of projections includes a concavity that has an inverted conical or inverted pyramid inner surface, a conical barrel portion that forms an outer periphery of the projection and extends in a conical shape in a direction in which the projection projects from the reference surface, and an outer edge portion surrounding a circumference of the concavity. Each of the projections has a height of 0.6 mm or greater and 1.4 mm or less, and the concavity has a depth within a range of 30% to 70% of the projection height.

A tire includes a pattern region at least on a part of an outer surface of a sidewall of the tire, the pattern region being visually recognizable as being different from a perimeter of the part. The pattern region includes a plurality of projections projecting from a reference surface of the pattern region. Each of the plurality of projections includes a concavity having an inverted conical or inverted pyramid inner surface, an outer edge portion surrounding a circumference of the concavity, and a conical barrel portion continuing from the outer edge portion to the reference surface, and a depth of the concavity is greater than a projecting height of the projection.