Abstract: A pneumatic tire has a tread rubber formed by a nonconductive rubber and a side wall rubber formed by the nonconductive rubber. An outer surface of the side wall rubber is provided with a band-like diametrical conductive portion which is formed by a conductive rubber and extends along a tire diametrical direction. An outer end of the diametrical conductive portion is exposed to a ground-contacting surface or is connected to a conductive rubber member which is exposed to the ground-contacting surface. An inner end of the diametrical conductive portion is exposed to a rim contact region or is connected to a rim strip rubber formed by the conductive rubber. A narrow groove is formed by depressing an outer surface of the diametrical conductive portion and extends in a tire diametrical direction in a side wall portion.

Abstract: Provided is a device for forming a special giant all-steel radial OTR tire in a continuous process, the device comprising a first base guide rail, a second base guide rail, a headstock, a main building drum, a belt housing, a belt drum and an overhead rail. The first base guide rail and the second base guide rail are parallel to each other. The overhead rail comprising a first traveling unit and a second traveling unit are disposed above the first base guide rail and the second base guide rail. A method for forming a special giant all-steel radial OTR tire in a continuous process is also provided.

Abstract: A method and a plant for manufacturing tires for vehicle wheels wherein the method includes the steps of: a) building in a building station a substantially cylindrical carcass structure; b) manufacturing in a finishing station a substantially cylindrical sleeve including a tread band applied at a radially outer position with respect to a belt structure including at least one belt layer. Step b) includes the steps of assembling a first belt structure at a first working position on a first auxiliary drum of the finishing station; applying a tread band at a second working position at a radially outer position with respect to a second belt structure previously assembled on a second auxiliary drum of the finishing station, positioning the first auxiliary drum supporting the first belt structure at the second working position; and positioning the second auxiliary drum supporting the substantially cylindrical sleeve thus obtained at a picking position of the finishing station.

Abstract: The present invention relates to a method of forming at least one circumferential belt layer of a pneumatic tire comprising: winding the strip for a half length of an outer circumferential length of the crown portion of the carcass along the tire equatorial plane from a widthwise inner side of the belt end region; winding the strip for the remaining half length while shifting the strip for the width of the strip from a widthwise inner to outer side; winding the strip for the outer circumferential length of the crown portion of the carcass along the tire equatorial plane; winding the strip for the half length of the outer circumferential length of the crown portion of the carcass while shifting the strip for the width of the strip from the widthwise outer to inner side; and winding the strip for the remaining half length along the tire equatorial plane.

Abstract: The present invention provides a method of producing a tire component member, which method allows rubber strip pieces to be sequentially attached without forming a gap therebetween.

Abstract: A pneumatic tire includes a tire component having a plurality of individually dipped and tackified cords applied individually to the tire component.

Abstract: A tread for a vehicle tire, such as a pneumatic vehicle tire, is provided with an electrically conducting layer axially inside a portion of a first, radially outer rubber layer of the tread. The electrically conductive layer extends from a second, radially inner rubber layer of the tread on the radially inner side of the tread rubber material up to a ground contact surface of the tread. The rubber material of the electrically conducting layer and the rubber material of the radially inner rubber layer of the tread have a higher electrical conductivity than the rubber material of the radially outer rubber layer.

Abstract: A tire is provided suppressing air incorporation and raising durability without a detrimental effect on running performance. A tire 10 includes a ring shaped tire case 17 formed from a frame resin material, with a reinforcement layer 28 formed by winding and joining a covered cord member 26, formed by a cord resin material 27 covering a reinforcement cord 26A, on a crown section 16 portion of the tire case 17. Accordingly air incorporation is suppressed and durability is raised without a detrimental effect on running performance.

Abstract: A pneumatic tire has a conductive portion formed by a conductive rubber is provided in the tread rubber formed by a nonconductive rubber. The conductive portion has an outer skin portion and a projection portion. The outer skin portion is formed on a surface of the tread rubber, and extends to an inner side in a tire width direction from a side surface of the tread rubber so as to terminate at a position which goes beyond a contact end. The projection portion spirally extends from a position in an outer side than contact end so as to reach a position in an inner side in the tire width direction than the contact end, and protrudes to an inner side in a tire diametrical direction from the outer skin portion so as to terminate without reaching a bottom surface of the tread rubber.

Abstract: A manufacturing method of a pneumatic tire in which a tread rubber formed by a nonconductive rubber is arranged in a tread portion, and a conductive portion which is formed by a conductive rubber and reaches a carcass layer or a belt layer from a ground surface is buried in the tread rubber, wherein a step of forming the carcass layer includes a step of forming a strip-like carcass ply by coating a plurality of carcass cords which are arranged in parallel, with a topping rubber constructed by a nonconductive rubber portion which is along an extending direction of the carcass cord, and a conductive rubber portion which is narrower than the nonconductive rubber portion, and a step of lining up a lot of the strip-like carcass plies in a ply width direction so as to bond the strip-like carcass plies sequentially.

Abstract: The invention provides a radial tire, in which a single rubber coated cord (C1) is used to form a carcass layer (1) without generating any material jointed portion and which is favorable in weight balance, external appearance, and quality and excellent in productivity, the carcass layer (1) is formed from at least one cord row layer (11A) formed by cutting a rubber coated cord (C1), which is formed to make an external shape of a cross section elliptical, one by one, to align and bond the same in a tire circumference direction, and the cord row layer is jointed only in a single location on a tire circumference to generate little overlap.

Abstract: A pneumatic tire according to the invention includes a cap rubber 12 as a non-conductive rubber layer and a conductive layer 13 that extends from the tread surface to the bottom surface of the cap rubber 12 through the cap rubber 12. The conductive layer 13 has a main portion 13a extending from the tread surface toward the inner periphery of the tire, and plural branch portions 13b branched from the main portion 13a and extending toward the outer periphery of the tire. At least, one of the branch portions 13b is exposed to the tread surface.

Abstract: A tread forming step of forming a non-conductive tread rubber includes a first step of forming the tread rubber in such a manner that a shoulder portion becomes smaller in diameter than a finish cross sectional shape, a second step of setting up a conductive layer extending along a tire circumferential direction while alternately passing through a first position which is exposed to a tread surface of the shoulder portion, and a second position which comes into contact with a sidewall rubber in an outer side in a tire width direction than the first position, and a third step forming a finish cross sectional shape of the tread rubber by adding a non-conductive rubber to the shoulder portion of the tread rubber.

Abstract: A pneumatic tire includes a non-conductive tread surface and has an electrically conductive rubber in a wave-like or other configuration arranged in a tire circumferential direction. The tire has an electrically conductive sidewall rubber. Upper portions of the wave-like conductive rubber configuration are on the tread surface, while lower portions of the wave-like rubber configuration contact the electrically conductive sidewall rubber. As the tread surface and the electrically conductive rubber on the tread surface are worn away through use, the diametrically outermost portion of the electrically conductive sidewall rubber of the tire comes into contact with the ground and maintains an effective electrically conductive path.

Abstract: The invention can efficiently provide a carcass member constituting a carcass layer of a radial tire, particularly, a carcass member a direction of a cord of which constitutes an angle of substantially 90° relative to a tire circumferential direction, and can easily adjust a length in accordance with a size, one piece of a cord (C) is continuously passed through a rubber coating die (14) to coat rubber on the cord, the rubber coated cord (C1) is shaped such that a sectional outer shape thereof constitutes an elliptical shape, the rubber coated cord (C1) is wound around an aligning drum (30) while adjusting a direction of the elliptical shape by way of an aligning guide (20) to bond without producing a gap to form a cylinder-like member (A1), thereafter, the cylinder-like member (A1) is cut in a direction in parallel with the drum axis center to constitute a sheet-like shape.

Abstract: Device for manufacturing a reinforcement from a thread laid directly in its final place by casting lengths of the said thread onto a receiving surface, the said device comprising a feed means (200) for feeding the thread (1) from a source of thread (10), a rotary assembly comprising a rotary guide (2) of axis rr? fixed to a hollow shaft (20, 205) constituting the axis of rotation (RR?) of the said guide (2) so that the outer radial end (21) of the said guide (2) is directed substantially radially with respect to the axis of rotation of the hollow shaft (RR?), the said guide receiving the thread (1) that comes from the said feed means via its central end (22) that is the opposite end to the said outer radial end (21), the said thread leaving via the said outer radial end (21), the said feed means controlling the linear speed at which the thread advances inside the said rotary guide (2), means (13, 131) for rotating the hollow shaft, and means (31) for cutting the thread, acting on the thread in such a way as t

Abstract: A method for controlling the discharge of fluids during a process for vulcanization and moulding of a green tire includes the steps of: building at least one portion of a radially internal surface of a green tire by winding of a continuous elongated element of elastomeric material into a plurality of coils confining circumferential grooves along the rolling direction of the tire; disposing the circumferential grooves into fluid communication with discharge channels present in the radially external surface of a pressing bladder disposed in a radially internal cavity bounded by the green tire.

Abstract: A pneumatic tire comprising a tire component having a plurality of individually plasma treated cords applied individually to the tire component, wherein the plasma treated cords comprise a plasma generated deposition derived from at least one polymerizable monomer.

Abstract: A pneumatic tire includes a tire component having a plurality of individually dipped and tackified cords applied individually to the tire component.

Abstract: A method of producing a pneumatic tire in which, a cord material of a secondary belt layer has a larger thermal shrinkage rate than that of the primary belt layer to effectively suppress the radial expansion of a tire and advantageously improve cutting-resistance of a tread as in the conventional tire. In the method, a ribbon-shaped strip 22 is folded in a region R, in a developed plan view of a material 21 forming the secondary belt layer, between a side end e of the forming material 21 and a position distanced from the side end toward the tire equatorial side by ¼ of the overall width of the forming material, such that the thus bent ribbon-shaped strip 22 extends in a curved manner to build a green tire.

Abstract: Reinforcement layer for pneumatic vehicle tires that includes reinforcements formed by one of filaments or cords made of steel that are disposed substantially parallel to and spaced apart from one another and are embedded in rubber material. A cord is formed by a maximum of two filaments twisted together and all of the filaments of the reinforcements have a diameter of less than 0.24 mm and a maximum of two filaments are twisted in each case to form a cord.

Abstract: Tread rubber is provided with a base rubber section formed by helically winding a first electrically non-conductive rubber strip, a cap rubber section formed by helically winding a second electrically non-conductive rubber strip, and a conduction section penetrating through the base rubber section and the cap rubber section and extending in the radial direction. The conduction section is composed of: a first electrically conductive winding section consisting of a first electrically conductive rubber strip which is wound within the base rubber section so as to be superposed on the first electrically non-conductive rubber strip; and a second electrically conductive winding section consisting of a second electrically conductive rubber strip which is wound within the cap rubber section so as to be superposed on the second electrically non-conductive rubber strip.

Abstract: Tubeless tire, adapted to be inflated with an inflation gas, comprising: a crown (25) comprising a crown reinforcement (80, 90) surmounted by a tread (40); two sidewalls (30) extending the crown radially inwards; two beads (20) radially inside the sidewalls and each comprising a annular reinforcement structure (70); a carcass reinforcement (60) anchored in each of the beads; an inner-liner (50) impermeable to the inflation gas, covering the inner surface of the tire; wherein, in each sidewall of the tire, the inner-liner comprises at least one slit (200), situated radially between the annular reinforcement structure that is radially outermost, and the radius RE at which the carcass reinforcement, when the tire is fitted to the rim and inflated to its operating pressure, has its largest axial width, the slit having a maximum radial height HR of between 0.5 and 5 mm and extending over at least half of the circumference of the tire. Also disclosed is a process for manufacturing such a tire.

Abstract: A pneumatic tire is provided with a belt reinforcing layer obtained by spirally winding a reinforcing cord, in a tread side of a belt layer arranged in a tread portion. The method comprises a step of laminating a plurality of cylindrical belt plies including a belt cord extending while inclining with respect to a tire circumferential direction so as to form the belt layer, and a step of spirally winding the reinforcing cord on an outer periphery of the belt layer so as to form the belt reinforcing layer. A winding direction of the reinforcing cord is set to an inverse direction to a direction of inclination of the belt cord of the belt ply positioned in an outermost periphery.

Abstract: A pneumatic tire containing a tread, a carcass having at least one belt ply disposed below the tread, and a cap ply located between the carcass and the tread. The cap ply comprises at least one layer of an open construction leno weave tape having a pair of warp yarns in the longitudinal direction and a weft yarn in the weft direction. The pair of warp yarns comprises a first warp yarn and a second warp yarn, where the second warp yarn has a force of elongation of between about 1 and 40% the force of elongation of the first warp yarn, where the second warp yarn is in tension, and where the second warp yarn has an elongation at break of greater than 2%. The leno weave tape is disposed in a flat pattern around the circumference of the carcass in the area of the belt ply. A method of making a pneumatic tire is also disclosed.

Abstract: A vehicle wheel tire includes a carcass structure, at least one annular reinforcing structure, a tread band, and a pair of sidewalls. The carcass structure includes at least one carcass ply, each including a plurality of elongated elements disposed around a cross-section profile of the tire. Each elongated element includes two side portions at mutually-spaced-apart positions and a crown portion that extends between the side portions. The at least one annular reinforcing structure includes at least one bead core. A fraction of the elongated elements is turned up around the at least one bead core. A method of manufacturing the tire includes preparing the elongated elements, disposing each elongated element on a toroidal support, applying at least one bead core at a region close to side portions of the elongated elements, and turning up ends of a fraction of the elongated elements around the at least one bead core.

Abstract: Disclosed are a method for manufacturing a heavy-duty pneumatic tire by winding a reinforcing belt disposed in a belt layer of a tread with an untopped spiral steel cord, and a tire manufactured by the same.

Abstract: A tire configured from joining together plural tire frame members formed from a thermoplastic material in which sufficient strength of the joint portion is secured. Two tire halves 17A formed from a first thermoplastic material are supported by a tire supporting section 40 so as to be aligned with each other and abutting, while rotating this configuration melted welding thermoplastic material 43 is extruded from a nozzle 46 towards the joining location, and the welding thermoplastic material 43 is pressed by a flattening roller 48. The one tire half 17A and the other tire half 17A are thereby welded together with the welding thermoplastic material 43. Since the tire halves 17A themselves are not melted, deterioration of the thermoplastic material forming the tire halves 17A is suppressed, and sufficient strength of the joint portion is secured.

Abstract: An object is to both provide a tire that is formed from a resin material, and in particular a thermoplastic material, and to also suppresses incorporation of air, raising durability. A tire 10 includes: a ring shaped tire case 23 formed from a resin material; a reinforcement cord 26 having a higher rigidity that that of the resin material, wound in a spiral shape on the outer peripheral section of the tire case 23 and having at least a portion of the reinforcement cord 26 embedded in and making close contact with the outer peripheral section of the tire case 23 when viewed in a cross-section along the axial direction of the tire case 23; and a tread 30 provided on the radial direction outside of a reinforcement cord layer 28 formed by the reinforcement cord 26. Accordingly air can be suppressed from being incorporated and durability can be raised.

Abstract: A process for depositing an annular reinforcing element on an annular anchoring structure of a tyre for vehicle wheels. The annular anchoring structure includes at least one substantially circumferential annular insert with which at least one filling insert is associated. The process includes the steps of: loading the annular anchoring structure onto a service platform; associating the annular reinforcing element with an annular portion of a side surface of the filling insert in a radially outer position with respect to the substantially circumferential annular insert, so as to form a reinforced annular anchoring structure; and unloading the reinforced annular anchoring structure from the service platform. The reinforced anchoring structure thus obtained can be used in building a carcass structure in the manufacturing of tyres for vehicles.

Abstract: First, a first belt ply is wound around an outer peripheral surface of a belt drum having a curvature so as to be formed as a tubular shape, and a rubber layer protruding to an outer side than an end portion in a width direction of a belt reinforcing layer is arranged in an outer periphery of an end portion in a width direction of the first belt ply. Further, a second belt ply which is narrower than the first belt ply is wound around an outer periphery of the second belt ply so as to be formed as a tubular shape, and a belt layer is formed in such a manner that the first belt ply and the second belt ply are laminated. The belt reinforcing layer is formed by spirally winding a rubber-coated reinforcing cord around an outer peripheral side of the formed belt layer, and an end portion in a width direction of the belt reinforcing layer is arranged in an outer side than the first belt ply.

Abstract: A robotized arm drives in rotation a drum carrying a tire being processed and conveniently moves it in front of a delivery nozzle supplying a continuous elongated element of elastomer material in order to form a tire component. The delivery nozzle is connected through at least one selecting valve with two or more extruders, each designed to supply a respective blend. The selecting valve connects the delivery nozzle with the outlet of one of the extruders, breaking communication between the nozzle and the other extruders. The outlets of the non-active extruders can be connected with at least one outlet duct. It is thus possible to replace the type of blend used for manufacturing the tire component without the article of manufacture having to be moved away from the delivery nozzle.

Abstract: During building of a carcass structure, a liner is applied around an outer surface of a primary drum by: circumferentially winding at least one pair of sheets of elastomeric material around an outer surface of the primary drum, which sheets are axially spaced apart from each other so as to form respective axially external portions of the liner; laying at least one continuous elongated element of elastomeric material in the form of a plurality of mutually approached coils around the outer surface of the primary drum in order to form a central portion of the liner having axially external edges that are each associated with an axially internal edge of one of said axially external portions of the liner.

Abstract: Building a carcass structure in the manufacturing of a tyre for vehicle wheels includes associating, at each end edge of a carcass ply laying on a forming support, at least one respective annular reinforcing structure obtained by depositing at least one respective reinforcing element. The deposition of the at least one respective reinforcing element includes feeding a continuous reinforced band-like element at a cutting unit, cutting to size at least one first reinforcing element from the continuous reinforced band-like element, moving the first reinforcing element from the cutting unit toward a first end edge of the carcass ply, positioning the first reinforcing element on the first end edge, cutting to size at least one second reinforcing element from the continuous reinforced band-like element, moving the second reinforcing element from the cutting unit toward a second end edge of the carcass ply opposite said first end edge, and positioning the second reinforcing element on the other end edge.

Abstract: The present invention enhances noise performance and anti-uneven wear performance. A pneumatic tire 1 includes a belt layer 7 including at least one belt ply in which belt cords 15 are arranged at an angle of 10 to 40° with respect to a tire equator C. A tread pattern formed on a surface of the tread portion 2 includes a pitch line 22 in which at least two kinds of pattern-constituting units 21 having different pitches in a circumferential direction of the tire are arranged in the circumferential direction of the tire. The belt cords 15 are arranged relatively densely on an inner side of the pattern-constituting unit 21 having a small pitch, and relatively thinly on an inner side of the pattern-constituting unit 21 having a large pitch.

Abstract: A green tire includes a surface layer defining a green tire surface and made up of a plurality of windings of an unvulcanized rubber tape. A part of each of the windings is exposed on the green tire surface so that the exposed part has a width of from 50% to 80% of the width W1 of the rubber tape. Each of the windings has a substantially rhomboid cross section and has one end at an acute angle corner exposed on the green tire surface and the other end at the opposing acute angle corner. An angle theta of a diagonal line of the rhomboid drawn between the one end and the other end is not more than 30 degrees with respect to a tangential line to a profile line of the green tire surface.

Abstract: An apparatus for building tyres for vehicle wheels includes a building drum having at least one first outer circumferential surface, and at least one pair of auxiliary support members removably in engagement with the building drum, each in axial side by side relationship with a respective end of the building drum and having second outer circumferential surfaces extending in the continuation of the first outer circumferential surface so as to support at least one component of the tyre. Each of the second outer circumferential surfaces has at least one non-stick circumferential portion and at least one sticking circumferential portion.

Abstract: A feed unit for feeding elastomeric material, extruded by at least one extruder, to at least one user unit, and wherein a variable-length conveyor is supported by a first and a second supporting device located at an input end and an output end of the conveyor respectively; and wherein the first supporting device is connected to the conveyor to allow the conveyor to rotate about a vertical first axis and a horizontal second axis, both crosswise to a travelling direction of the elastomeric material along the conveyor; the second supporting device is extensible vertically and connected to the conveyor by a first releasable joint; and the conveyor is connectable to the user unit by a second releasable joint.

Abstract: The constituent elements of a carcass structure of a tire are formed by laying elementary components on a building support including an inflatable bladder set in an inflated condition in which it substantially reproduces the inner configuration of the carcass structure to be obtained. A belt structure carrying a tread band, both produced separately, is coaxially disposed around the carcass structure formed on the building support and applied thereto following a radial expansion of the inflatable bladder. In a vulcanization mold, the building support is submitted to an over-inflation step to press the tire against the inner walls of the mold. The circumferential edges of the inflatable bladder are in engagement with respective anchoring flanges with possibility of movement in a radial direction, so as to be submitted to an elastic expansion during the over-inflation step.

Abstract: A pneumatic tire containing a tread, a carcass having at least one belt ply disposed below the tread, and a cap ply located between the carcass and the tread. The cap ply comprises at least one layer of an open construction leno weave tape having a pair of warp yarns in the longitudinal direction and a weft yarn in the weft direction. The pair of warp yarns comprises a first warp yarn and a second warp yarn, where the second warp yarn has a force of elongation of between about 1 and 40% the force of elongation of the first warp yarn, where the second warp yarn is in tension, and where the second warp yarn has an elongation at break of greater than 2%. The leno weave tape is disposed in a flat pattern around the circumference of the carcass in the area of the belt ply. A method of making a pneumatic tire is also disclosed.

Abstract: A process for building tyres, includes forming at least one component of the tyre being processed directly on a forming support. The tyre component consists of elastomeric material including reinforcing thread elements. The continuous ribbon-like element of elastomeric material including reinforcing thread elements is produced by feeding the reinforcing thread elements through openings defined by circumferential grooves formed in at least one of two guide rollers consisting of idler rollers facing each other, and by laying at least one layer of elastomeric material on the reinforcing thread elements.

Abstract: A tire structural member fabricating method fabricates a tire structural member by successively and contiguously attaching strips 1 to the convex outer surface having an outwardly convex cross section of a forming drum 11 by a strip feed device 21 such that the strips 1 extend obliquely to the center axis C of the forming drum 11. The strip feed device 21 moves parallel to the center axis C of the forming drum 11 at a fixed speed V and feeds strips 1 successively onto the outer surface of the forming drum 11. A controller 40 controls the rotation of the forming drum 11 such that the angular velocity ? of the forming drum 11 varies gradually.

Abstract: A tire manufacturing method in which a rubber strip is passed through and between a rotating pair of rollers and held by the lower roller. The rubber strip is moved to a formed body on a support, and wound helically and stacked. When the tip of the rubber strip is supplied, the rotational peripheral speed of the lower roller for stacking is made relatively slower than that of the upper roller to provide a difference in feeding amounts of the rubber strip by the rollers, and thus the tip of the rubber strip is guided to the lower roller side having a smaller feeding amount. After the tip of the rubber strip is held by the lower roller, the rotational peripheral speeds of the rollers are changed to the same speed, and the rubber strip is stacked.

Abstract: A tire (1) comprising a crown reinforcing belt, formed of a plurality of reinforcing plies (13, 14) superposed on one another, each reinforcing ply resulting from the circumferential winding of one or more ply portions, in which tire the faces of the circumferential ends of the said portions (13, 14) are butted together to form a butt joint (130, 140).

Abstract: A sidewall rubber disposed outside of a carcass layer, reinforcing a portion between beads, in a widthwise direction of the tire is configured from a wide rubber ribbon having a width of 20 to 100 mm wound spirally along a circumferential direction of the tire outward of the tire such that the rubber ribbon is deviated radially outward of the tire.

Abstract: An apparatus for manufacturing a reinforcement from a thread laid down directly in its final location by projecting lengths of the thread onto a receiving surface (S). The apparatus has feed means for feeding thread from a source of thread, a rotary conduit (2) receiving the thread, thread-cutting device has a roller fixed with respect to the thread, and a moving cutter acting on the thread in collaboration with said roller so as, for each revolution of the rotary conduit, to release a length having a free end at the cutting means end. The apparatus also has a buffer positioned in the path of the free end so that, during the operation, the free end strikes the buffer before coming into contact with the receiving surface (S).

Abstract: A method of making a tire comprising the steps of providing a core; forming a first layer of ply by winding a strip of one or more rubber coated cords onto the core in a geodesic pattern extending from a first shoulder to a second shoulder opposite said first shoulder and being tangent to the bead at a location between said first shoulder and said second shoulder.

Abstract: A method and apparatus for applying a blended rubber composition directly onto a tire building drum or core is described. The method includes the steps of extruding a first rubber compound through a main extruder and a main gear pump. A second rubber compound is extruded through a second extruder and into a second gear pump. The output from the second gear pump is fed into the main extruder. The ratio of the first compound to the second compound is varied by adjusting the speed of the main gear pump and the speed of the second gear pump. A continuous strip of rubber formed of said first compound and said second compound is laid directly onto a tire building machine to form a first layer of rubber having a first blend ratio. The speed of the main gear pump and the second gear pump is adjusted to obtain a second blend ratio of said first compound to said second compound, and then a strip of rubber formed of said second blend ratio is applied to the tire building drum or core.

Abstract: This invention provides a rubber composition comprising 1-10 parts by mass of sulfur and 0.1-10 parts by mass of a compound represented by the following general formula (1) or a composition containing the compound as a main component based on 100 parts by mass of a rubber component as well as a pneumatic tire in which at least one of a carcass (4) and a belt (6) includes a layer composed of steel cords covered with a coating rubber, characterized in that the above rubber composition is used as the coating rubber covering the steel cords in at least one of the carcass (4) and the belt (6): (wherein R represents a divalent aliphatic group having a carbon number of 1-16 or a divalent aromatic group).

Abstract: The present invention is directed to a self-supporting tire. More specifically, the tire has a carcass, a tread, and a belt reinforcing structure located radially outward of the carcass and radially inward of the tread. The carcass is comprised of a reinforcing ply structure extending between a pair of bead portions and having a geodesic configuration. The tire further includes a pair of sidewalls, each sidewall located radially outward of one of the pair of bead portions, and a pair of inserts located in each sidewall. A first insert and second insert are located between the innerliner and the ply.