Abstract: A method of manufacturing a tread for agricultural tires, the method comprising providing an agricultural tire casing, providing a cured rubber component having first and second planar surfaces, providing a plurality of cushion gums, wherein the plurality of cushion gums contains a cure system comprising a stable dinitrile oxide compound, providing a plurality of lugs, and forming an agricultural tread composite by mating the lugs to a planar surface of the cured rubber component using the cushion gum.

Abstract: A process for manufacturing rubber crumb comprises the following steps: (a) suspending rubber granules having a given size in an autoclave (1) containing a supercritical fluid; (b) agitating the mixture for a predetermined time at constant pressure and constant temperature; (c) carrying out an isenthalpic expansion of the mixture from step (b) by spraying it through a nozzle (20).

Abstract: Embodiments of the invention include methods for supporting a recessed void during retreading operations. Such methods include the steps of providing a tread having a top side and a bottom side, the tread including a recessed void recessed below the top side of the tread. Such methods also include the step of arranging the tread around an outer circumference of the tire carcass in a desired position to form an assembled retreaded tire. Such methods further include the step of arranging a removable circumferential band around the assembled retreaded tire positioned over top the recessed void and the top side of the tread. Such methods further include the steps of placing a curing membrane around at least a portion of the tire and the circumferential band and curing the retreaded tire with the circumferential band contained within the curing membrane.

Abstract: Provided are a tire having a small difference in a loss tangent (tan ?) at a tire tread outer surface position and that at a middle position, a tread for a retread tire having an even vulcanization degree in a whole tread rubber area, a tire having the tread for the retread tire, and a method for manufacturing the tire. The tire satisfies the following formula: ?0.05?(tan ?a?tan ?b)/tan ?b?0.05, where (tan ?a) represents a loss tangent of strain at 2% at 25° C. in a portion (a) within 1 mm deep from a tire tread outer surface in a direction perpendicular to a tread surface, and (tan ?b) represents a loss tangent of strain at 2% at 25° C. in a portion (b) within 2 mm from a median center between a tread portion outer surface and a bottom surface in the direction perpendicular to the tread surface.

Abstract: The present invention relates to an apparatus (10) and a method for retreading a tire (16) having a worn surface (12). The worn surface (12) is made of a thermoplastic elastomer. The apparatus (10) includes a heater (34) and a 3D printer (18). The heater (34) is adapted to heat up the worn surface (12) to a desired temperature. The 3D printer (18) is adapted to lay one or more layers of the thermoplastic elastomer onto the heated worn surface (12). The or each layer of thermoplastic elastomer is capable of adhering to the heated worn surface (12) or previously laid layer without requiring an adhesive medium or agent.

Abstract: A tire having aggressive tread features with improvements in uniformity that can also improve endurance is provided along with a method and apparatus for manufacturing such a tire. The tire and its manner of manufacture can achieve a reduction or elimination of certain non-uniformities that can occur during the molding of large tread blocks. The reduction or removal of these non-uniformities can improve temperature performance to provide increased tire endurance.

Abstract: Method of manufacturing a tire comprising a tread strip in which blind radial cuts are arranged in the blocks of rubber that form the tread pattern, comprising a step during which the cuts (33) are made in the unvulcanized tread strip (3) intended to cap the green tire. One or more blades (22) are raised to a temperature higher than the vulcanization temperature of the material of which the tread strip (3) is made are caused to penetrate the radially internal face (32) of the tread strip (3) for a sufficient period of time that they superficially vulcanize the walls of the cut in contact with the blade (22) so as to prevent the faces from sticking back together once the blade has been withdrawn from the cut.

Abstract: Provided are a rubber composition suitable for cushion rubbers of retreaded tires in which tread rubbers of tires such as truck and bus tires (TBR) and aircraft tires are replaced for reuse, and a rubber composition which is suitable for adhesion carried out by interposing the rubber composition between vulcanized rubber members and covulcanizing them in a tire prepared by adhering separately vulcanized rubber members and which is excellent in a productivity. The rubber composition is characterized by comprising 0.3 to 2.5 parts by mass of aldehydeamines, 0.1 to 1.5 part by mass of at least one compound selected from a group consisting of tetra(2-ethylhexyl)thiuram disulfide, 1,6-bis(N,N?-dibenzylthiocarbamoyldithio)-hexane and 1,6-bis{N,N?-di(2-ethylhexyl)thiocarbamoyldithio}-hexane, and 0.1 to 2.5 parts by mass of a thiazole type vulcanization accelerator based on 100 parts by mass of a rubber component.

Abstract: Particular embodiments of the invention comprise multi-wear layer tire treads for retreaded tires and methods of forming retreaded tires. In particular embodiments, a multi-wear layer tire tread includes a thickness bounded depth wise by a ground-engaging top side and a bottom side, the thickness extending laterally between opposing side edges and longitudinally in a lengthwise direction of the tread. Such tire tread may further include a removable tread portion recessed from the top side to form a subsequent wear layer, the removable tread portion extending into the tread thickness from the bottom side and terminating a distance below the top side, the removable portion having a width arranged between opposing interior surfaces of the tread recessed below the top side.

Abstract: The invention comprises a tire tread, and tire, and a method of forming a tire having the tire tread. Particular embodiments of the tire tread have a tread thickness bounded by a top side and a bottom side, and a groove extending into the tread thickness from the top side and terminating within the tread thickness at a groove bottom. A thickness of the tread extends from the groove bottom to a protruding portion of the bottom side of the tread below the groove bottom such that portions of the bottom side adjacent the protruding portion are recessed within the tread thickness. Such tire tread further includes a plurality of strengthening members forming protrusions extending into the groove from the groove bottom and from at least one side of the pair of opposing groove sides, the plurality of strengthening members being arranged along a length of the groove.

Abstract: A method and system for retreading a tire; the method including the steps of: removing the worn tread from the tire; winding a green-rubber cushion about the tire; forming at least one longitudinal groove in an inner surface of a tread strip; applying to the inner surface of the tread strip a green-rubber strip which is inserted inside the longitudinal groove to fill the longitudinal groove; winding the tread strip about the tire and on top of the green-rubber cushion; and curing the tire fitted with the green-rubber cushion and the tread strip.

Abstract: Particular embodiments of the present invention include tire treads that include a tread body having a length, a width, and thickness, the thickness being bounded by an outer surface and an underside surface. Such treads may also include a void positioned within the thickness of the tread body. Such treads may further include one or more members extending between the void and the tread underside surface. Other embodiments of the present invention include a tire having such treads, as well as molds for forming such treads.

Abstract: A retread tire and methods for its manufacture, the retread tire having a precured tread band bonded to a prepared bonding surface of a base portion of the tire. The precured tread band includes a back face bonded to the prepared bonding surface of the base portion of the tire and a tread groove bottom portion that extends below the back face of the tread band. The tread groove bottom portion may optionally include a void portion of the tread groove and may include the bottom wall of the tread groove and/or just the side walls of the bottom portion of the tread groove. Also included may be a base groove formed in the base portion of the tire and open to the prepared bonding surface of the tire, wherein the tread groove bottom of the tread groove is embedded within the base groove.

Abstract: A tread for use in a tire retread process includes a first side and a second, flat side. A plurality of lugs is formed on a first side of the tread and arranged along in a periodically repeating tread pattern. A set of marks is formed in at least one outer lug and defines a finite linear distance along the tread within which the tread is adapted to be cut into the length of tread, such that when the length of tread is deposited around the casing of the tire and the ends of the length of tread are placed in abutting relationship one relative to the other along a seam, the periodically repeating tread pattern appears substantially continuous. The set of marks is predetermined in advance of retreading to be located in positions where at least some of the performance and processing characteristics of the tread may be improved.

Abstract: A motorcycle tire for running on rough terrain comprises a tread portion having a developed tread width and provided with a plurality of tread blocks. The tread blocks include a plurality of crown blocks defined as having a ground contacting top surface whose centroid is located within a crown region defined as having a developed width of ? of the developed tread width and centered on the tire equator. The crown blocks include a plurality of central crown blocks whose axial distance from the tire equatorial plane to the centroid is not more than 2% of the developed tread width, and a plurality of off-center crown blocks whose axial distance from the tire equatorial plane to the centroid is more than 2% and not more than 6% of the developed tread width.

Abstract: A pneumatic radial tire includes: at least one carcass layer suspended across left and right bead parts; a belt layer arranged on an outer circumferential side of the carcass layer; and a tread arranged on an outer circumferential side of the belt layer. The tread has a laminated structure in which a thermoplastic film layer of a thermoplastic resin or a thermoplastic elastomer composition is interposed between a tread-side rubber layer and a belt layer-side rubber layer. The thermoplastic elastomer composition is obtained by blending an elastomer in a thermoplastic resin. A process for producing a retreaded tire includes the steps of: forming a base tire from the pneumatic radial tire by softening the thermoplastic film layer through heating so as to separate and remove the tread-side rubber layer, the pneumatic radial tire having the tread worn away; and subsequently bonding a new tread-side rubber layer onto the base tire.

Abstract: Embodiments include retreaded tires having a precured tread band bonded to a prepared bonding surface of a base portion of the tire, the tread band including a primary groove having a top open to a ground contacting front face of the tread band and a secondary groove having a bottom open to a back face of the tread band, the back face bonded to the prepared bonding surface, wherein the groove top of the secondary groove is higher than a groove bottom of the primary groove so that the secondary groove top is opened to the ground contacting front face of the tread band prior to disappearance by wear of the primary groove. A base groove may be formed in the base portion of the tire and open to the prepared bonding surface of the tire, wherein the secondary groove bottom opens in fluid communication with the base groove.

Abstract: A child's riding toy is provided having a vehicle body, at least one rotatable tire, and traction band. The at least one rotatable tire is configured to support at least a portion of the vehicle body and move the vehicle body from one location to another. The rotatable tire comprises a circumferentially-extending tread section, a sidewall, and a circumferentially-extending shoulder connecting to both the tread section and sidewall. The circumferentially-extending tread section comprises a tread surface configured to engage a ground surface while supporting at least the portion of the vehicle body. The tread section includes a channel equatorially located and circumferentially-extending. The traction band is sized to fit within the channel and have a top surface located about flush with the tread surface such that as the tread surface engages the ground surface so too does the band's top surface. Wherein both the traction band and tire tread simultaneously engage the ground to move the ride-on toy.

Abstract: The object is to provide a precured tread for a retreaded tire improving attachability to a base tire. In a strip-shaped precured tread 10 to be attached to a crown portion of a base tire 32 from which a tread has been removed, side tread rubbers 14 disposed in side regions CS on both sides of a central region CN are set to have JIS A hardness lower than that of a central tread rubber 12 disposed in the central region CN including a widthwise centerline C so as to improve attachability to a base tire.

Abstract: Embodiments of the invention are used to provide ways of tire tread molding and retreading with a double tread rubber body having a unitary structure that comprises two treads in order to remove the need for buffing an oxide layer typically associated with tread molding and curing. Embodiments of the double tread molding and retreading methods also remove the need for cementing the cured tread to prevent future oxidation buildup. Once the double tread is cured and cooled, it is cut along the centerline with a double tread separation apparatus to expose a soft non-oxidized inner rubber. The cutting is much less energy intensive when compared to buffing with an expendable wire brush. There is no risk of spots of oxidized rubber being missed as is the case with buffing. There is little or no dust created.

Abstract: Included are tread bands for use on retreaded tires and methods for retreading a tire using such tread bands. Embodiments of such tread bands include a primary groove having a top opening that is open to a ground contacting front face of the tread band and a secondary groove having a bottom opening that is open to a back face of the tread band. The groove top of the secondary groove is higher than a groove bottom of the primary groove so that the secondary groove top is opened to the ground contacting front face of the tread band prior to disappearance by wear of the primary groove. Particular embodiments may also further include an overflow reservoir having a reservoir opening that is open to the back face of the tread band, the reservoir opening being positioned adjacent to an edge of the secondary groove bottom opening.

Abstract: Embodiments include a retreaded tire having a precured tread band bonded to a prepared bonding surface of a base portion of the tire. The precured tread band may include a tread groove having a bottom and a top, the top of the groove open to a ground contacting front face of the tread band, the precured tread band further comprising a back face, the back face bonded to a prepared bonding surface of a base portion of the tire. A base groove may be formed in the base portion of the tire and open to the prepared bonding surface of the tire, wherein the tread groove bottom is aligned over a length of the base groove. In some embodiments, the tread groove bottom may be open to the base groove over at least 50% or the entire length of the base groove.

Abstract: Embodiments of the invention are used to provide ways of tire tread molding and retreading with a double tread rubber body having a unitary structure that comprises two treads in order to remove the need for buffing an oxide layer typically associated with tread molding and curing. Embodiments of the double tread molding and retreading methods also remove the need for cementing the cured tread to prevent future oxidation buildup. Once the double tread is cured and cooled, it is cut along the centerline with a double tread separation apparatus to expose a soft non-oxidized inner rubber. The cutting is much less energy intensive when compared to buffing with an expendable wire brush. There is no risk of spots of oxidized rubber being missed as is the case with buffing. There is little or no dust created.

Abstract: This invention relates to a pneumatic rubber tire having a rubber tread of a cap/base construction. More specifically, the invention relates to a tire having a tread with minimized, or inhibited, base peaking.

Abstract: A mold (150) for a tread layer (40) having tread-forming side and sole-forming side, the sole-forming side having a plurality of mold elements (56) extending therefrom toward the tread-forming side. Either the mold elements (56) or the sole-forming side of the mold is configured to create a tread layer (40) having a recessed tread element such as an incision, lateral groove, longitudinal groove or other void on the sole side of the tread layer that enables the edges of the recessed tread element to obtain full coverage when subjected to an abrasion process.

Abstract: The present invention relates to a method of retreading a tire and a retread tire (10) made by this method. The method comprises the steps of providing a tread layer (40) having a tread side (44) and a sole side (46) wherein the surface of the sole side (46) includes a plurality of tread elements (48) such as sipes and/or grooves or other void. Each tread element (48) has a first edge (64) and a second edge (66) at the surface of the sole side (46) of the tread layer (40). At least one of the first edge (64) and second edge (66) is formed to have a break edge (84) such as a rounded edge or a chamfered edge of 0.4 mm or more. The break edge (84) removes the sharp corner and provides increased endurance for the retreaded tire (10).

Abstract: A two-piece tire assembly 10 with a removable tread belt 12 for installing about the circumference of a tire carcass 14 is provided. The two-piece tire assembly 10 includes a tread belt 12 has a belt structure 90 having two or more belt layers 100, 110, 120, 130 each layer having one or more belts. The tread belt 12 has a radially inner surface 70 having one or more protruding circumferential ribs 72 or grooves 74 that fit into complementary grooves 18 or ribs 19 on an outer crown surface of the tire carcass 14. The tread belt 12 has a maximum axial belt width W at a radially inner surface. The carcass 14 has a maximum section width SW and ply line 20 having a maximum width P wherein W?0.95P, BW?5 0.85P and P<SW.

Abstract: A device for extending the life of a tire and providing a new tread layer, principally for off road truck tires, has a mechanically attached surface tread of rubber blocks cooperatively connected with a cable system and specialized tensioning. The apparatus is generally suited to tires of very large size, typically used on dump trucks in open pit mining applications.

Abstract: A two-piece tire assembly with a removable tread belt for installing about the circumference of a tire carcass is provided. The inner surface of the tread belt follows a non-linear, preferably arcuate profile with a radius of curvature R across the tread belt wherein the distance DL as measured from the axis of rotation to the inner surface of the tread belt extends a distance DO at the equatorial plane and curves radially inwardly to a distance DE at each belt edge such that DE?0.9*DO.

Abstract: A retreaded pneumatic truck tire includes a used carcass having a uniform annular attachment area and a retread element. The retread element secures to the attachment area of the used carcass. The retread element has a tread pattern comprising a first circumferential groove separating the tread pattern into a first shoulder rib and an intermediate rib and a second circumferential groove separating the tread pattern into the intermediate rib and a second shoulder rib. The tread pattern further comprises a first plurality of identical arcuate notches extending axially and circumferentially across the first circumferential groove and a second plurality of identical arcuate notches extending axially and circumferentially across the second circumferential groove. The first plurality of arcuate notches are offset circumferentially from the second plurality of arcuate notches.

Abstract: A method of cutting a length of tire tread for a retread tire includes measuring a circumference of the tire casing and cushion gum, and dispensing a length of tire tread from a roll based on the measured circumference. The length of tire tread relative to a tread cutter is adjusted so that the tire tread design at the point where the tread may be cut is between a set of marks formed in the periodically repeating tread design. The tread is then cut along a linear length of the tread disposed within the marks so that the periodically repeating tread pattern appears substantially continuous across a seam defined when the section of tire tread is wrapped around the casing such that the first and second ends meet in abutting relationship.

Abstract: A tyre for a wheel of a vehicle comprises a toroidal carcass provided with axially opposite sidewalls and beads for anchoring the tyre to a rim of the wheel, a tread band located crownwise on the carcass, comprising a surface with a plurality of hollows and grooves defining a raised tread pattern, and a belt structure interposed between the carcass and the tread band, axially extending between the sidewalls. The tread band comprises at least first and second circumferential axially-contiguous portions arranged to contact a road surface. The first portion is formed of a first composition comprising a reinforcing filler having at least 40%-by-weight carbon black and at least some white filler, the second portion is formed of a second composition comprising a reinforcing filler having at least 20%-by-weight white filler, and the first composition is different from the second composition.

Abstract: The present invention is directed to a tire retread cushion laminate, comprising a first rubber layer, a second rubber layer, and an intermediate rubber layer disposed between the first and second rubber layers such that the first and second rubber layers do not meet; the first rubber layer comprising a sulfur donor and substantially devoid of vulcanization accelerators; the second rubber layer comprising a vulcanization accelerator and substantially devoid of sulfur donors; the intermediate rubber layer being substantially devoid of sulfur donors or vulcanization accelerators.

Abstract: Annular tyre overlay (11) for drawing onto the rolling surface of tyres (40), which has a tread (17) on its outside and a gripping surface (15) on its inside, which tyre overlay (11) is so designed that contact between the rolling surface of the tyre (40) and the surfacing of the road is prevented by the tyre overlay (11) when the tyre overlay has been drawn onto a tyre. The said tyre overlay (11) is provided with a flange (21) which stops the tyre overlay (11) from shifting in the axial direction of the wheel. Advantageously, the tyre overlay is additionally stiffened by a flange (21) of planar form to keep the contact area on the surface below small.

Abstract: A retreaded tire capable of improving unbalance of the tire is efficiently produced. Retread rubber has the largest thickness in a joint part F on the circumference. Such a joint part F is arranged in a minimal location S (corresponding to a light location of static unbalance), in which a rubber gauge G as measured in a radial direction of the tire from a buffed surface K of a base tire D to an outer surface of an outermost belt cord L embedded in an outermost belt layer disposed in a radially outermost side among belt layers constituting a belt is minimal on the circumference in an equatorial plane of the tire in attaching so that the total rubber gauge of the retread rubber T at the joint part F surely approaches total rubber gauges at other locations on the circumference to effectively reduce unbalance.

Abstract: A tyre for a wheel of a vehicle comprises a toroidal carcass provided with axially opposite sidewalls and beads for anchoring the tyre to a rim of the wheel, a tread band located crownwise on the carcass, comprising a surface with a plurality of hollows and grooves defining a raised tread pattern, and a belt structure interposed between the carcass and the tread band, axially extending between the sidewalls. The tread band comprises at least first and second circumferential axially-contiguous portions arranged to contact a road surface. The first portion is formed of a first composition comprising a reinforcing filler having at least 40%-by-weight carbon black and at least some white filler, the second portion is formed of a second composition comprising a reinforcing filler having at least 20%-by-weight white filler, and the first composition is different from the second composition.

Abstract: The invention relates to a pneumatic tyre which comprises first (10) and second (12) separable tyre parts, the first tyre part including the tyre's side walls and the inner layer of the tyre's crown and having reinforcing plies in it, and the second tyre part encircling the first tyre part and having the tread pattern (14) therein. The said second tyre part (12) further has beads (22) along both peripheries thereof, said beads being outwardly of said side walls of said first tyre part (10).

Abstract: A two-piece tire assembly with a removable tread belt for installing about the circumference of a tire carcass is provided. The two-piece tire assembly includes a tread belt comprised of two or more belt layers, each layer having one or more belts, wherein at least one of the belts in each layer has a chord length less than about 25% of the circumferential length of the belt.

Abstract: A tire with a changing tread pattern is formed by first forming a tire having a tread, the tread having at least one circumferential or lateral groove. Formed separately is a wearable filler, the wearable filler having a configuration corresponding to at least a portion of the circumferential or lateral groove formed in the tire. After both the tire and the wearable filler have been cured, the wearable filler is located in the radially outer portion of the circumferential or lateral groove or a portion of the circumferential or lateral groove, and secured within the grooves so as to create a groove void radially inward of the wearable filler, the void being exposed upon wear of the tire tread.

Abstract: A tire with a changing tread pattern is formed by first forming a tire having a tread, the tread having at least one circumferential or lateral groove. A wearable filler, having a configuration corresponding to at least a portion of the circumferential or lateral groove formed in the tire, is located in the radially outer portion of the circumferential or lateral groove or a portion of the circumferential or lateral groove, and secured within the grooves so as to create a groove void radially inward of the wearable filler, the void being exposed upon wear of the tire tread.

Abstract: A tire is manufactured on standard tire building equipment and cured in standard curing presses. The tire tread has at least one deep circumferentially extending groove. Within the groove is a separately assembled ring. The ring may be fitted into the deep groove after vulcanization of the tire. For very wide tires, two grooves with two external rings may be used or more than two grooves and beads, depending upon the tire width.

Abstract: A laminar “precured” or “replacement” tread for wheeled vehicles operating at night on retreaded tires is made more readily visible when grooves in the tires are provided with elastomeric strips or bands in which are embedded retroreflective elements such as transparent glass or synthetic resinous microspheres (referred to herein as “beads”). Upper surfaces of longitudinal ridges in a flat curing mold lend themselves to supporting the strips which are then precisely positioned in grooves defined by the ridges, when the flat tread is cured.

Abstract: The present invention, in one embodiment, is a method of making a tire with a skin covering at least a portion of the outer peripheral surface of the tire. In practicing the method, a partially cured tire and a partially cured skin are provided. The partially cured tire and the partially cured skin are installed in a tire mold with the skin engaging and covering at least a part of the outer surface of the tire and with the skin facing an inner surface of the mold. Heat and pressure are applied to the tire to press the skin and the tire against the inner surface of the mold. The heat and pressure are maintained for a predetermined time period to vulcanize and bond together the tire and the skin.

Abstract: A method for bonding a material to a first substrate surface that includes providing a catalyst at the first substrate surface and then contacting that surface with a material that undergoes a metathesis reaction to bond the material to the first substrate surface. There are two embodiments of this method—a coating process and an adhesive process. In the coating embodiment, the metathesizable material is contacted with the catalyst on the substrate surface so that it undergoes metathesis polymerization to form the coating. The adhesive process includes (a) providing a catalyst at the first substrate surface, (b) providing a metathesizable material between the first substrate surface and the second substrate surface, and (c) contacting the catalyst on the first substrate surface with the metathesizable material so that the metathesizable material undergoes a metathesis reaction and bonds the first substrate surface to the second substrate surface.

Abstract: The present invention relates to preparation an article of manufacture, such as of a tire, via application of at least one partially pre-cured component. Tires are often prepared with pre-cured, pre-shaped components such as for example, application of pre-cured tread strips to a cured carcass as in the case of re-treaded tires. Thus precured tread and cured carcass are joined together using a cushion gum followed by heating the resulting assembly at an elevated temperature to cure the cushion gum. Such pre-cured component may also be, for example, a sidewall apex. In such cases, the pre-cured component is subjected to more heat than is necessary which may be detrimental for the component. This invention is directed to the use of a partially pre-cured component to prepare a tire assembly prior to the curing of the entire components of the tire assembly.

Abstract: A laminar “precured” or “replacement” tread for wheeled vehicles operating at night on retreaded tires is made more readily visible when grooves in the tires are provided with elastomeric strips or bands in which are embedded retroreflective elements such as transparent glass or synthetic resinous microspheres (referred to herein as “beads”). Upper surfaces of longitudinal ridges in a flat curing mold lend themselves to supporting the strips which are then precisely positioned in grooves defined by the ridges, when the flat tread is cured.

Abstract: The invention is a method for retreading a tire comprising the step of using a supercritical fluid as a carrier to spray a gum cushion layer on the outer surface (radially outermost) of the carcass of a tire. In a preferred embodiment of the invention, the supercritical fluid is carbon dioxide. In one embodiment of the invention, the supercritical fluid is a mixture of a rubber product, a solvent, and a supercritical fluid carrier. In another embodiment of the invention, the gum cushion rubber delivered by the supercritical fluid forms a layer less than 300 microns thick between the new tread and the upper surface of the carcass of the tire after curing. In another embodiment of the invention, the gum cushion layer is delivered to the carcass by means of a supercritical fluid as a dual solution system, composed of one solution without sulfur, and one solution without accelerator.

Abstract: Plastic impact driven fasteners having relatively high flexural strength and relatively low heat deformation temperature are provided. Additional embodiments relate to methods of using the fasteners. For example, the fasteners may be used in a tire retreading process. In such a case, one or more fasteners may be used to secure new tread to a tire core before and/or during a curing process. The curing process may also cause deformation of the fastener, thereby eliminating the need to remove the fasteners after the curing process.

Abstract: A tread for retreading tires, having an external face (21) provided with the usual grooves (23) and an internal face (22) to be seated and adhered, usually by vulcanization, to the convex external face (11) of a tire carcass (10), from which the compound of the original tread has been totally abraded, said tread (20) presenting a thickness that varies throughout the width thereof, having its internal face (22) defined in a concave arc, with the radius of curvature corresponding to that of the external face (11) of the tire carcass (10) and with its external face (21) being flat or slightly convex, with the radius of curvature substantially larger than that of its internal face (22).

Abstract: A two-piece tire assembly 10 has a removable tread belt 12 for installing about the circumference of a tire carcass 14. The tread belt 12 has a radially outer ground contracting tread 15 and a radially inner belt reinforcing structure 100 having ply layers forming tread belts 84, 86, 88, 92. Radially inward of the belt reinforcing structure 100 is a radially inner portion 70, the radially inner portion 70 has a radially inner surface 72 in contact with the outer circumferential surface of the carcass 14. In one embodiment of the invention the radially inner surface 72 of the tread belt 12 and outer circumferential surface 71 of the carcass 14 have circumferentially extending grooves 74, 78 and ribs 72, 76 that complimentarily interlock. Traversing the ribs 72, 76 of the carcass or the tread belt are fluid or gas venting subsurface passages 80, 82 that are open to one or more groove 74, 78. The venting subsurface passages 80, 82 provide a convective cooling system for the two-piece tire assembly 10.