A method of preparing a tire with self-sealing properties, the method including the steps of providing a cured tire, the tire including a first bead, a second bead, a carcass layer extending from the first bead to the second bead, and an optional innerliner layer disposed interior to the carcass layer; directly or indirectly applying a sealant composition to at least a portion of the carcass layer or to at least a portion of the optional innerliner; and directly applying an air barrier composition to at least a portion of the carcass layer or to at least a portion of the optional innerliner.

The present invention provides a pneumatic tire including a sealant layer that has excellent tear resistance despite its being formed of a generally string-shaped sealant provided continuously and spirally along an inner periphery of the tire. Included is a pneumatic tire including an innerliner and a sealant layer located radially inside the innerliner, the sealant layer including a first sealant layer and a second sealant layer stacked in that order from the innerliner, the first sealant layer including a generally string-shaped sealant provided continuously and spirally along an inner periphery of the tire, the second sealant layer including a generally string-shaped sealant provided continuously and spirally along the first sealant layer, the sealant of the first sealant layer and the sealant of the second sealant layer extending in directions crossing each other.

A system (1) for applying a sealing agent to the surface (5) of an internal cavity (2) of a pneumatic tyre (3) provided with an applicator device (12) for supplying a strip of sealing agent that is applied to the surface (5) and an opto-electronic device (4*; 20) that is integral to the nozzle (18) of the applicator device (12) and that is provided with at least one sensor element (9*; 20) that is able to acquire a plurality of images of the surface (5) and to provide a plurality of signals that are indicative of said plurality of acquired images; and an electronic processing system (11) connected to the opto-electronic device (4*; 20), and to the applicator device (12) and configured so as to acquire the signals that are indicative of the plurality of images acquired by the opto-electronic device (4*; 20); and to control the application of the sealing agent as a function of the plurality of signals that are indicative of the plurality of images acquired by the opto-electronic device (4*; 20).

An application system and method for applying a sealing agent to the inner surface of a pneumatic tire includes: rotating, by means of a support device, the pneumatic tire about an axis of rotation; applying a layer of sealing agent to the inner surface of the pneumatic tire by means of a dispensing head arranged within the pneumatic tire itself; pressing, by means of a pressure roller, the just applied layer of sealing agent against the inner surface of the pneumatic tire; pushing the pressure roller against the just applied layer of sealing agent by means of an actuator which generates a force having a desired value; determining, by means of a force sensor, a measured value of the force generated by the actuator; and cyclically varying the force generated by the actuator as a function of the measured value of the force.

Provided are a rubber composition for pneumatic tires with excellent fluidity and excellent degradation resistance, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for pneumatic tires containing a rubber component including a halogenated butyl rubber, and an organic peroxide.

Provided are a rubber composition for pneumatic tires which is excellent in adhesion, sealing performance, fluidity, and processability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for pneumatic tires containing, per 100 parts by mass of a rubber component including a butyl-based rubber: 100 to 400 parts by mass of a liquid polymer; 1 to 40 parts by mass of an organic peroxide; and 1 to 40 parts by mass of a crosslinking activator.

A system for applying a sealing agent to the surface of an internal cavity of a pneumatic tire provided with an applicator device for supplying a strip of sealing agent that is applied to the surface and an opto-electronic device that is integral to the nozzle of the applicator device and that is provided with at least one sensor element that is able to acquire images of the surface and provide a plurality of signals that are indicative of said plurality of acquired images; and an electronic processing system connected to the opto-electronic device, and to the applicator device and configured so as to acquire the signals that are indicative of the plurality of images acquired by the opto-electronic device; and to control the application of the sealing agent as a function of the plurality of signals that are indicative of the plurality of images acquired by the opto-electronic device.

A method of applying a sealant layer to an inner surface of a tire and a resulting tire are disclosed. Prior to sealant application first and second balance light spots on first and second sides of the tire are identified. A starting location for the sealant bead adjacent the first side of the tire is determined as a function of the location of the first balance light spot. An ending location for the sealant bead adjacent the second side of the tire is determined as a function of the location of the second balance light spot. Balance of the tire is improved by the application of the sealant layer.

When a sealing layer is formed of a strip-like sealant on an inner surface of a tire, thickness variations of the sealing layer can be easily restrained.

A sealing layer (17) is formed of a strip-like sealant (20) on an inner surface (5) of a tire (1). A pair of side surfaces (21) of the sealant (20) is located on both sides in a width direction (H) of the sealant (20) and is inclined toward the same side in the width direction (H) of the sealant (20) with respect to a thickness direction (R) of the sealant (20). The sealant (20) is spirally arranged on the inner surface (5) of the tire (1) with the adjacent side surfaces (21) of the sealant (20) being overlapped with each other, so that the sealing layer (17) is formed.

A pneumatic tire 1 has a sealant layer 11 arranged on an inner cavity surface. The sealant layer 11 includes an adhesive material 12 having adhesiveness and flowability, and fillers 13 each formed in a fibrous or rod-like shape. Each of the fillers 13 has a length more than 5 mm and not more than 30 mm and an outer diameter in a range of from 0.2 to 1.0 mm.