Abstract: A process for modifying an expandable curing bladder for a tire, which bladder has a surface intended to come into contact with a tire casing is provided. The process comprises a step of applying to the surface a layer of a silicone rubber composition comprising a first liquid organopolysiloxane bearing chain-end alkenyl groups, a second liquid organohydropolysiloxane and a photoactivatable hydrosilylation catalyst, and a step of exposing the silicone rubber composition covering the surface to irradiation with ultraviolet-visible light.

Abstract: The invention relates to a laminate comprising a first layer and a second layer directly covering the first layer, the first layer being a layer of a silicone rubber composition comprising a micrometric silicone powder and a mixture of crosslinkable organopolysiloxanes, the second layer being a layer of a silicone rubber composition comprising a hydrophobic silica and a mixture of crosslinkable organopolysiloxanes, the first layer and the second layer being crosslinked. The laminate, in particular when it is used as a coating for the outer surface of an expandable bladder for a tyre curing mould, makes it possible to eliminate moulding defects on the inner liner of the tyre.

Abstract: A curing bladder (7) for a tire has a shape exhibiting symmetry of revolution with a central axis and comprises a flexible wall made of cross-linked rubber, the external surface (20) of the wall comprising an air drainage zone (21) and an air removal zone (22) adjacent to the drainage zone, the bladder (7) being equipped with an air drainage structure comprising elements recessed into the external surface, the recessed elements forming a network of channels (30) extending in the air drainage zone (21) and as far as the air removal zone (22). The depth of a channel (30) of the network, defining the shortest path (31) connecting any point of the network of channels, which is situated in the air drainage zone (21), and the air removal zone (22), increases along the length of the path.

Abstract: The invention relates to a method for curing a tire, during which there is deployed, against the interior surface of said tire, a curing membrane of which the contact surface is provided with a drainage structure which comprises air-discharge channels and which is subdivided into a first drainage region which will be pressed intimately against the crown region of the tire, a second drainage region which will be pressed intimately against the sidewall region, and a third drainage region which will be pressed intimately against the bead region, and which is such that the mean depth of the channels of the third drainage region is strictly greater than the mean depth of the channels of the second drainage region, which is itself strictly greater than the mean depth of the channels of the first drainage region.

Abstract: A silicone rubber composition is provided. The silicone rubber composition comprises a hydrophobic silica, polyamide microparticles, a liquid organopolysiloxane having two chain ends each bearing an alkenyl group, a liquid polyhydroalkylsiloxane having two chain ends each bearing an SiR?3O1/2 group, and a hydrosilylation catalyst. The ratio of the number of (R?HSiO2/2) units in the polyhydroalkylsiloxane to the number of alkenyl groups is greater than 5. Such a composition has good adhesive properties with respect to a crosslinked butyl rubber composition, good friction resistance properties and good flexibility properties.

Abstract: A curing bladder (7) for a tire has a shape of revolution about a central axis and a flexible wall made of crosslinked rubber, the external surface of which is intended to come into contact with the internal surface of a green tire during curing, the external surface having a relief structure having a plurality of air evacuation channels. The relief structure has first channels forming air evacuation grooves (100) arranged at a distance of between 2 and 5 mm, and having a depth of between 0.4 and 1 mm, two adjacent grooves defining, between one another, an inter-groove zone (500) having second channels forming air channelling furrows (1000) made so as to communicate with one another and with at least one of the grooves (100), the furrows each having a depth of between 0.01 and 0.4 mm and being situated at a distance of between 0.2 and 1 mm from one another.

Abstract: A curing bladder (7) for a tire has a shape of revolution about a central axis and a flexible wall made of crosslinked rubber, the external surface of which is intended to come into contact with the internal surface of a green tire during curing, the external surface having a relief structure having a plurality of air evacuation channels. The relief structure has first channels forming air evacuation grooves (100) arranged at a distance of between 2 and 5 mm, and having a depth of between 0.4 and 1 mm, two adjacent grooves defining, between one another, an inter-groove zone (500) having second channels forming air channelling furrows (1000) made so as to communicate with one another and with at least one of the grooves (100), the furrows each having a depth of between 0.01 and 0.4 mm and being situated at a distance of between 0.2 and 1 mm from one another.

Abstract: The curing bladder for a tire has a shape of revolution around a central axis and comprises a flexible wall made of crosslinked rubber. The surface of the wall is covered with a coating film made of a non-stick composition. When the bladder is non-inflated, the coating film has a variable thickness over the surface.

Abstract: The curing bladder for a tire has a shape of revolution around a central axis and comprises a flexible wall made of crosslinked rubber. The surface of the wall is covered with a coating film made of a non-stick composition. When the bladder is non-inflated, the coating film has a variable thickness over the surface.

Abstract: A method for assembling a green tire blank includes, in succession, laying rubber plies on a drum having segments that are radially moveable, with respect to a main axis, between expanded and collapsed positions; laying bead wires; lifting up edges of the plies that extend axially beyond the bead wires towards ends of the drum using wings that extend axially and that are arranged circumferentially around the main axis; and folding the edges of the plies using rollers. The segments form an external circumferential face of the drum. The rollers are independent of the drum and move in an axial direction on the circumferential face of the drum in order to turn the edges of the plies around the bead wire. The wings move in longitudinal cuts that run parallel to the main axis at ends of the segments in order to lift up the edges of the plies.