Provided is a stable and highly productive method for producing a pneumatic tire. The present invention relates to a method for producing a pneumatic tire, the method including: sequentially preparing a sealant by mixing raw materials including an organic peroxide using a twin screw kneading extruder; and sequentially applying the sealant to the inner periphery of a tire.

A system is provided for applying a sealing agent to an surface of an internal cavity of a pneumatic tire. The system provides for detecting the weight of the pneumatic tire before and after the application of the sealing agent to the surface, calculating the difference between the quantity of sealing agent applied to the surface and a reference quantity of sealing agent; storing the difference within a short-term memory buffer and a long-term memory buffer; determining a short-term compensation factor and a long-term compensation factor and calculating a correction factor using alternatively the short-term compensation factor or else the long-term compensation factor; and using the correction factor to actuate an applicator device during the subsequent step of applying the strip of sealing agent to the surface.

A dispense robot for applying a sealant layer on an inner surface of a tire as the tire rotates about a horizontal axis of rotation includes an articulating arm assembly including a distal arm member. A sealant nozzle may be carried by the distal arm member and configured to dispense a bead of sealant material from a nozzle tip of the sealant nozzle as the sealant nozzle moves in a traversing direction across a width of the inner surface of the rotating tire. First and second distance sensors may be located on opposite sides of the sealant nozzle and configured to view along a length of the sealant nozzle such that a distance of the nozzle tip from the inner surface of the tire is detected by the distance sensors.

A tire may include a tread portion, first and second sidewall portions extending radially inward from the tread portion. an inner surface defining an inner cavity of the tire between the first and second sidewall portions, and a spiral wound sealant bead laid down on the inner surface, the sealant bead having a starting end portion closest to the first sidewall and a terminating end portion closest to the second sidewall, the starting end portion and the terminating end portion overlapping by an overlap angle about a tire axis in a range of from 80 to 100 degrees.

Methods are provided for applying a sealant layer to an inner surface of a tire. A first tire may be picked up with a tire handling robot and placed on a first sealant application stand. A sealant bead may be applied to the inner surface of the first tire by a dispense robot. A second tire may be picked up by the tire handling robot and placed on a second sealant application stand. A sealant bead may be applied to the inner surface of the second tire by the dispense robot. The first and second sealant application stands may be arranged adjacent to each other. The tire handling robot and the dispense robot may be located on opposite sides of the sealant application stands.

A method for applying a sealing agent to a surface of an internal cavity of a pneumatic tire includes inserting an optoelectronic device into the internal cavity and rotating the tire at least 360 degrees about a first axis to acquire captured images and perform a three-dimensional surface scan of various portions of the surface that are uniformly distributed 360 degrees about the first axis, and thereby identify x, y, and z reference coordinates of various points into which each portion is divided as a function of the respective images. An interior surface profile is determined from the images and the identified reference coordinates, an applicator device including a nozzle is inserted into the internal cavity, and the applicator device is driven as a function of the identified three-dimensional reference coordinates of the entire internal cavity to maintain a constant distance between the applicator device and the surface.

A method and a system for applying a highly viscous fluid to an inner surface of a cavity of a tire, comprising an applicator device for the highly viscous fluid and a delivery circuit for the highly viscous fluid connected to the applicator device and having a highly viscous fluid collection device comprising a tank that internally defines a collection chamber; a delivery device for the highly viscous fluid implemented by means of a pumping device that delivers the highly viscous fluid to the applicator device; a movable piston that delimits the collection chamber at the perimeter; an extractor element intended to move with an alternating movement so as to draw the first highly viscous fluid inside the collection chamber and deliver it to the pumping device; and a position sensor, in particular a linear position transducer, suitable for detecting the position of the piston.

Provided is a pneumatic tire with excellent tire noise-reducing properties. The pneumatic tire includes a resonator attached to the inner periphery of the tire, the resonator including a tube with an opening, and a cavity connected to the tube.

The process includes a non-crosslinked self-sealing composition which is introduced into an extrusion means, the geometric and thermodynamic characteristics of which have been specially adapted. The speed and temperature conditions of the extrusion means are adjusted so that, at an application nozzle forming the outlet die of the extrusion means, the self-sealing composition is crosslinked. The application nozzle is brought close to the internal surface of the casing previously set in relative motion with respect to the application nozzle, and an extruded and crosslinked bead that has a given width and profile is deposited directly on the internal surface of the casing.

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 indicative of the 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.