摘要:
Disclosed is a pneumatic tire comprising (A) reinforcing layer comprising a plurality of reinforcing cords or wires coated with a rubber composition, wherein (B) a film layer, (C) an elastomer layer, and (D) a film layer comprising ethylene-vinyl alcohol copolymer are sequentially laminated on the tire inner surface side of reinforcing layer (A), and the product of Young's modulus Eb (MPa) and thickness Gb (mm) of film layer (B) is equal to or more than 5 kN/m, wherein the reinforcing layer having improved durability.
摘要:
A method of forming a tire innerliner having a cylindrical inner rubber layer and a cylindrical film formed of a thermoplastic resin or a thermoplastic elastomer composition having a thermoplastic resin and an elastomer blended therewith. The cylindrical film is disposed radially outwardly of the cylindrical inner rubber layer. The method includes the following steps: wrapping an unvulcanized rubber layer cylindrically around a building drum to form the cylindrical inner rubber layer; and subsequently wrapping a sheet-shaped film formed of a thermoplastic resin or a thermoplastic elastomer composition having a thermoplastic resin and an elastomer blended therewith cylindrically around the cylindrical inner rubber layer, which is already wrapped around the building drum, to form the cylindrical film. The unvulcanized rubber layer constituting the cylindrical inner rubber layer is a strip-shaped rubber layer, and the cylindrical inner rubber layer is formed by spirally winding the strip-shaped rubber layer.
摘要:
A pneumatic tire which uses, as an inner liner layer, a laminated sheet obtained by laminating an air permeation preventing layer, made of any one of a thermoplastic resin and a thermoplastic elastomer composition containing a blend of the thermoplastic resin and an elastomer, and a tie rubber layer, and which has high durability to prevent development of a crack in the tie rubber layer that occurs around a splice portion of the laminated sheet after the tire starts to be used. In the pneumatic tire, a sagged portion is formed by a concavo-convex structure in the air permeation preventing layer at least between points P and Q in a shape that a length La of a straight line connecting points P and Q and a length Lb of the air permeation preventing layer actually passing through points P and Q satisfy a relationship of (1.03×La)≦Lb≦(1.5×La).
摘要:
A non-pneumatic tire tire/wheel assembly including a tire main body 1 at least a part of which is constituted by an elastomer composition, the tire main body being assembled on a wheel. The tire main body 1 is tightened and fixed to the wheel by a tightening member 7 that is embedded in the tire main body 1 throughout a tire circumferential direction. Furthermore, at least a part of the elastomer composition constituting the tire main body is a thermoreversible crosslinking elastomer composition. In the non-pneumatic tire tire/wheel assembly for light vehicle use, a tire/wheel assembly can be provided in which a tire is strongly and reliably fixed to a wheel and, moreover, by which recycling (material recycling) of the tire main body is enabled.
摘要:
Provided is a method of manufacturing an unvulcanized tire, with which formation of air pockets is reduced in adhering a cylindrical film member and an adhesive sheet member to each other by using a forming drum having an expansion/contraction mechanism. In the method, a forming device having a forming drum (1) which has an expandable/contractible outer diameter and a forming roller (2) disposed in parallel to the forming drum (1) is used; a cylindrical film member (3) is wound around the forming drum (1) and the forming roller (2); thereafter, the diameter of the forming drum (1) is expanded whereby the cylindrical film member (3) is tensioned so as to be in close contact with the forming drum (1); and subsequently, an adhesive sheet member (4) is supplied and adhered to an outer peripheral surface of the cylindrical film member (3) on the forming roller (2), while the cylindrical film member (3) is being moved in a circumferential direction by rotating the forming drum (1).
摘要:
Provided is a non-pneumatic tire in which buckling can be prevented without a weight increase, the non-pneumatic tire including a spoke structure. The spoke structure is obtained by circumferentially arranging spokes intermittently at intervals and coupling together annular cylindrical outer member and cylindrical inner. The spoke structure is joined to an inner peripheral side of a tread ring. At least some of a plurality of spaces formed between two spokes adjacent to each other in the tire circumferential direction have an air-containing structure.
摘要:
A method of forming a tire innerliner and a method of producing a pneumatic tire according to the present invention suppresses occurrence of an air pocket and avoids complicating the structure of a tire building machine.The method of forming a tire innerliner is a method of forming a tire innerliner having a cylindrical inner rubber layer 3 and a cylindrical film 4 formed of a thermoplastic resin or a thermoplastic elastomer composition having a thermoplastic resin and an elastomer blended therewith, the cylindrical film 4 being disposed radially outwardly of the cylindrical inner rubber layer 3. The method comprises wrapping an unvulcanized rubber layer 3′ cylindrically around a building drum 1 to form the cylindrical inner rubber layer 3 and wrapping a sheet-shaped film 4′ formed of a thermoplastic resin or a thermoplastic elastomer composition having a thermoplastic resin and an elastomer blended therewith cylindrically around the cylindrical inner rubber layer 3 to form the cylindrical film 4. The method of producing a pneumatic tire uses the above method of forming a tire innerliner.
摘要:
Provided are: a pneumatic tire capable of retaining a satisfactory uniformity even though the tire includes film layers superposed by winding a film layer in a circumferential direction of the tire multiple times; and a process for producing the same. The present invention is the pneumatic tire including the film layers of the thermoplastic resin or the thermoplastic elastomer composition made by blending the elastomer with the thermoplastic resin, which are superposed by winding the film layer in the circumferential direction of the tire multiple times, the tire wherein a rubber film is interposed between the film layers. The process for producing the pneumatic tire includes: preparing a laminated body in which the rubber layer is stuck to at least one surface of the film layer; interposing the rubber layer between the film layers by winding the laminated body in the circumferential direction of the tire multiple times; forming an uncured tire which includes the film layers and the rubber layers; and curing the tire.
摘要:
This invention relates to a vulcanizable layered composition comprising at least two layers and at least one tie layer, wherein the first layer of the two layers comprises an fluid permeation prevention layer, the second layer of the two layers comprises at least one high diene rubber, and the tie layer comprises a mixture of: (1) about 50 to about 95 weight % of at least one halogenated isobutylenecontaining elastomer; (2) about 5 to about 50 weight % of at least one high diene elastomer; (3) about 20 to about 50 weight % of at least one filler; (4) about 0 to about 30 weight % of at least one processing oil; and (5) at least about 0.2 to about 15 parts per hundred of rubber (phr) of a curing system for the elastomers; wherein said fluid permeation prevention layer comprises a polymer composition having an air permeation coefficient of 25×10−12 cc·cm/cm2 sec cmHg (at 30° C.) or less and a Young's modulus of 1 to 500 MPa, said polymer composition comprising: (A) at least 10% by weight, based on the total weight of the polymer composition, of at least one thermoplastic engineering resin component having an air permeation coefficient of 25×10−12 cc·cm/cm2 sec cmHg (at 30° C.) or less and a Young's modulus of more than 500 MPa, where the thermoplastic engineering resin component is selected from the group consisting of polyamide resins, polyester resins, polynitrile resins, polymethacrylate resins, polyvinyl resins, cellulose resins, fluororesins, and imide resins, and (B) at least 10% by weight, based on the total weight of the polymer composition, of at least one elastomer component having an air permeation coefficient of more than 25×10−12 cc·cm/cm2 sec cmHg (at 30° C.) and a Young's modulus of not more than 500 MPa, where the elastomer component is selected from the group consisting of diene rubbers and the hydrogenates thereof, halogen-containing rubbers, silicone rubbers, sulfur-containing rubbers, fluoro-rubbers, hydrin rubbers, acryl rubbers, ionomers and thermoplastic elastomers, and where the total amount of the component (A) and the component (B) is not less than 30% by weight based on the total weight of the polymer composition, wherein the elastomer component (B) is dispersed in a vulcanized or partially vulcanized state, as a discontinuous phase, in a matrix of the thermoplastic resin component (A) in the polymer composition.
摘要:
A method of producing a pneumatic radial tire has a step of forming a tire casing, where, in the step, at least an inner liner, a left and right pair of narrow adhesion sheets, and a carcass layer are wound, in that order from the inside, in a hollow-cylindrical shape on the outer periphery of a shape-forming drum while being pressed by a pressing/adhering roller, and a bead core and a bead filler are set at both left and right end portions of the outermost periphery. The shape-forming drum has circumferential belt-like grooves formed in its outer periphery, at positions corresponding to the positions of the adhesion sheets. A shape-forming drum having an elastic layer coated on its outer periphery can also be used as the shape-forming drum.