An envelope spreader system is provided. The envelope spreader system includes a chassis having an opening configured to receive a tire assembly and a linkage assembly. The linkage assembly includes a plurality of links rotatably coupled to the chassis and extending into the opening. The linkage assembly further includes a spreader bounded at least in part by the plurality of links, the spreader being configured to cause the tire assembly to move; and an actuator operably coupled to the linkage assembly and configured to operate the linkage assembly between a first position and a second position.

A method of retreading a tire. The method includes the steps of applying a primer to an inner surface of a circumferential tread and applying the primer to an outer surface of a tire casing; applying an adhesive to the primer disposed on the inner surface and the primer disposed on the outer surface; applying the circumferential tread to the tire casing so the inner surface contacts the outer surface and a bondline edge forms circumferentially about the tire casing proximate to a shoulder area of the tire casing; and coupling a moisture reservoir to the circumferential tread proximate to the bondline edge.

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.

A process for retreading a tire, the process comprising the steps of providing a tire casing; providing a cured rubber component having first and second planar surfaces, where the first planar surface includes a tread pattern; providing a cushion gum, wherein the cushion gum is a composition including a functional polymer including at least one functional group, and a crosslinking agent including at least two moieties that will react with the functional group of the functional elastomer; applying the cushion gum to the tire casing; applying the second planar surface of the cured rubber to the cushion gum to form a tire composite; and treating the tire composite to thereby form a retread tire.

A process for retreading a tire, the process comprising the steps of providing a tire casing; providing a cured rubber component having first and second planar surfaces, where the first planar surface includes a tread pattern; providing a cushion gum, wherein the cushion gum is a composition including a functional polymer including at least one functional group, and a crosslinking agent including at least two moieties that will react with the functional group of the functional elastomer; applying the cushion gum to the tire casing; applying the second planar surface of the cured rubber to the cushion gum to form a tire composite; and treating the tire composite to thereby form a retread tire.

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.

This invention provides an envelope configuration for retreading tires using a cold-retreading process. Envelopes formed by two parts are known in the prior art. However, the known sealing means between parts are not satisfactory, either due to sealing problems or due to decreasing the envelope useful life. In order to overcome these limitations, this invention provides an envelope (20) comprised of two parts (22, 24), in which an end region (224a) of a flap (224) of the first part (22) is covered by an end region (244a) of a flap (244) of the second part (24), or vice-versa, in order to form an overlapping joint, in which a free end of the flap (224) of the first part (22) has at least one differentiated cross section (224b) whose thickness is greater than that of the flap (224) of the first part (22), and in which the overlapping joint is covered by an elastic ring (26) that is wide enough to cover said differentiated cross section (224b).

The invention includes methods for forming a retreaded tire, and treads there for. Particular embodiments of such methods provide a tire tread, the tire tread having a bottom side and a top side configured for engaging a ground surface, a thickness extending between the top side and the bottom side, and a pair of opposing lateral sides defining a width of the tread, the bottom side having one or more submerged voids extending from the bottom side into the tread thickness to form a tread pattern, the submerged voids having a depth less than the thickness and the top side being free of any exposed voids comprising a groove. Further steps include applying the tire tread to a tire carcass, curing the tire tread to the tire carcass, and forming one or more voids into the tread thickness the top side of the tread after the step of bonding.

The invention includes methods of forming a retreaded tire, and treads there for. Particular embodiments of such methods provide a tire carcass configured to receive the tire tread along an annular tread-receiving area and a pre-cured tire tread including a tread body and a detachable connector. The connector is arranged within a thickness of the tread between a top void portion and a bottom void portion and extending across a width of the top void portion and of the bottom void portion. The detachable connector is configured to separate from the tread upon application of a separation force. Further steps include assembling a retreaded tire by arranging the tire tread atop a bonding layer arranged between the tire tread and the tire carcass, bonding the tire tread to the tire carcass, and removing the detachable connector from the top void portion after the step of bonding.

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.