摘要:
The invention relates to a method of manufacturing a pneumatic tire (400) with improved tire uniformity. The tire has a pair of beads (432a,432b) in bead portions and at least one carcass ply (418) extending between the beads and consisting of reinforcement cords (419) embedded in a rubber matrix (836). The method is characterized by the steps of: a) forming the rubber matrix of the carcass ply or a portion of the bead portions from a matrix material (such as a thermoplastic) that can be rendered plastic and rendered non-plastic, which respectively permits and restricts reorientation of the reinforcement cords, b) rendering the matrix material plastic (such as by heating the thermoplastic) before the tire begins to cure to permit the one or more of the reinforcement cords to be free to reorient themselves, and c) curing the tire in a tire mold (354) while the matrix material remains plastic so that the reinforcement cords remain free to reorient themselves while curing.
摘要:
According to the invention, a pneumatic tire and method of manufacturing the pneumatic tire having improved tire uniformity characteristics is disclosed. The carcass reinforcement ply has a plurality of reinforcement cords embedded in a matrix material that can be rendered plastic and non-plastic to, respectively, permit and restricts reorientation of the reinforcement cords after the tire has been at least partially vulcanized. The method includes the steps of rendering the matrix material plastic, reorienting one or more reinforcement cords without their being stretched beyond their elastic limits, and then rendering the matrix material non-plastic. The reorientation can occur while the tire is still in the tire mold or when the tire is still hot from the tire mold and at a temperature of at least the deflection temperature by applying a force for reorienting the reinforcement cords.
摘要:
The present invention relates to a tire construction and method of correcting one or more tire uniformity characteristics. A tire has two beads and a carcass reinforcement ply having reinforcement cords. The method is characterized by the steps of A) forming a portion of the tire with a material (typically a thermoplastic), that can be rendered plastic (such as by heating) and rendered non-plastic (such as by cooling), which, in turn, respectively, permits and restricts reorientation of the reinforcement cords; B) rendering the material plastic, after the tire has been vulcanized, to permit one or more of the reinforcement cords to be reoriented; C) reorienting one or more reinforcement cords with respect to other rein-forcement cords or tire components; and D) rendering the material non-plastic, to restrict further reorientation of adjacent reinforcement cords. Reorientation of the cords can be achieved without stretching them beyond their elastic limit.
摘要:
A tire tread may be formed by simultaneously extruding a tread cap formed of a first material and a tread base formed of a second material having a substantially different stiffness property than the first material. One tread element may have a strip of the second material extending from the tread base into the tread cap and, a second tread element may also have a strip of the second material extending from the tread base into the tread cap.
摘要:
The subject invention is directed towards tire components which are comprised of rubber compositions which are comprised of (1) about 2 phr to about 45 phr of a trans-1,4-isoprene-butadiene copolymer which has about 4 weight percent to about 16 weight percent butadiene repeat units and from about 84 weight percent to about 96 weight percent isoprene repeat units, wherein the trans-1,4-isoprene-butadiene copolymer has a Mooney ML 1+4 viscosity which is within the range of about 35 to about 80; and (2) about 55 phr to about 98 phr of at least one other elastomer, preferably a diene based elastomer. The most preferred tire components are those which contain cord reinforcements and require adequate green strength to enhance the tire building and shaping process to maintain cord integrity in the final cured tire.
摘要:
The invention relates to a tire having a rubber tread comprised of cap/base construction where the tread outer cap rubber layer contains the running surface of the tread and the tread base rubber layer underlies the tread cap layer wherein the base layer provides a transition zone between the tread cap layer and the remainder of the tire carcass and is not intended to be ground-contacting. For this invention, the tread base rubber layer is comprised of three distinct zones, namely a circumferential annular central rubber zone positioned between two lateral annular rubber zones. In one aspect, the rubber tread cap layer and zoned rubber tread base layer are co-extruded together to form an integral tread rubber composite.
摘要:
The invention relates to a rubber cement, fabricated tire tread and resulting tire, where the tire tread is fabricated by joining ends of an uncured rubber strip together with a silica coupler-containing rubber cement between opposing ends of the uncured tread rubber strip where the rubber strip contains a high content of hydrophobated precipitated silica and where the cement contains a silica coupling agent.
摘要:
This invention relates to a tire having at least one rubber component which contains a cast, extruded, or calendered film of syndiotactic polybutadiene polymer. The syndiotactic polybutadiene polymer film is integral with the surface of the rubber component in a sense of being co-cured therewith. Such film may be added directly to the tire during the building process or involve a separate process of producing a tire component as a composite of the film and a rubber composition (rubber component) prior to the tire building stage. Such composite can be as is or partially pre-cured before being applied in the tire building process. The syndiotactic polybutadiene polymer film is provided to promote both stability and age durability for the tire component.
摘要:
The present invention is directed to a method for making a pneumatic tire having a foam noise damper, the pneumatic tire comprising two spaced inextensible beads; a ground contacting tread portion; a pair of individual sidewalls extending radially inward from the axial outer edges of said tread portion to join the respective beads, the axial outer edges of the tread portion defining a tread width; a supporting carcass for the tread portion and sidewalls; an innerliner disposed radially inward of the carcass, the innerliner having a innerliner surface facing an interior cavity of the tire; the method comprising the steps of: applying a silicone adhesive to the innerliner surface to form an adhesive prepared surface; applying a solid foam noise reducer to the adhesive prepared surface; and curing the adhesive.
摘要:
This invention relates to a tire comprised of an assembly of uncured rubber components wherein said assembly includes a circumferential uncured pre-formed internal composite comprised of a combination of at least one uncured rubber layer containing metal cord reinforcement with a high sulfur content and at least one adjoining auxiliary buffer layer of uncured rubber layer having a significantly lower sulfur content and without cord reinforcement. The auxiliary buffer rubber layer(s) with the reduced sulfur content is provided to promote tear resistance and sulfur cure reversion resistance for the composite. In a preferred embodiment, the uncured rubber composite is pre-formed prior to its application to and made a part of the tire assembly of components. The tire assembly is thereafter cured in a suitable mold to form a tire.