Abstract: A method of manufacturing a tire 2 includes the steps of (1) preparing a large number of reference plies 56, each of which includes a plurality of cords 48 arranged in parallel and a topping rubber 50, has a center portion 76 and a pair of side portions 78 and can be an element of a carcass ply 38, (2) bonding the reference ply 56 to the other reference ply 56, (3) forming a slit 68 extended in a transverse direction of the side portion 78 and dividing the side portion 78 into a plurality of small pieces 80, (4) partially overlapping the small piece 80 and the other small piece 80 with the side portion 78 provided along a side surface of a toroidal mold, (5) assembling the other member into the reference ply 56, thereby obtaining a raw cover, and (6) pressurizing and heating the raw cover in a mold.

Abstract: It is an object of the present invention to precisely and efficiently paste a tread ring and a raw tire base body with each other. A ring-like base body 5 is aligned with a former 3. The ring-like base body 5 relatively approaches and separates from a former 3. The ring-like base body 5 includes pasting means 6 which pastes a tread ring A to a raw tire base body B. The pasting means 6 includes a grasping tool 11 having a plurality of segments 13 which abut against an outer peripheral surface of the tread ring A to grasp the tread ring A. The pasting means 6 also includes a pushing-down pasting tool 12 having an annular rubber tube body 15. The rubber tube body 15 is disposed on each side of the segment 13 and pushes down a shoulder side portion As of the tread ring A by expansion to paste the shoulder side portion As to the raw tire base body B.

Abstract: It is an object of the invention to provide a pneumatic tire and a producing method thereof capable of enhancing uniformity. A pneumatic tire 1 comprises a carcass which uses a carcass ply 10 in which a radially arranged carcass cord array is coated with topping rubber, and a tread. The carcass ply 10 includes a center ply portion 11 which is wound around the tread portion 2 in a circumferential direction of the tire and whose beginning end and terminating end in the circumferential direction of the tire are jointed to each other, and long rectangular ply portions 12 on opposite sides of the center ply portion 11. In each long rectangular ply portion 12, long rectangular pieces 12a formed by cutting the topping rubber by slits 13, and each long rectangular ply portion 12 is bent radially inward in accordance with shape of the sidewall portion 3 in a manner that adjacent long rectangular pieces 12a are superposed on each other, thereby forming a side portion 6S of the carcass.

Abstract: It is an object of the present invention to precisely and efficiently paste a tread ring and a raw tire base body with each other. A ring-like base body 5 is aligned with a former 3. The ring-like base body 5 relatively approaches and separates from a former 3. The ring-like base body 5 includes pasting means 6 which pastes a tread ring A to a raw tire base body B. The pasting means 6 includes a grasping tool 11 having a plurality of segments 13 which abut against an outer peripheral surface of the tread ring A to grasp the tread ring A. The pasting means 6 also includes a pushing-down pasting tool 12 having an annular rubber tube body 15. The rubber tube body 15 is disposed on each side of the segment 13 and pushes down a shoulder side portion As of the tread ring A by expansion to paste the shoulder side portion As to the raw tire base body B.

Abstract: A bias tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions each with a bead core therein, a carcass extending between the bead portions and comprising two cross plies of cords, and a tread rubber disposed radially outside a crown portion of the carcass to define a tread face, wherein the loss tangent of the tread rubber is in a range of 0.40 to 0.60 under a temperature of 50 deg.C., the distance between the tread rubber and the adjacent cords of the radially outermost carcass ply is at most 1.0 mm, and the two cross plies include at least one ply of PEN cords made of polyethylene 2,6 naphthalate fibers twisted together.

Abstract: A bias tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions each with a bead core therein, a carcass extending between the bead portions and comprising two cross plies of cords, and a tread rubber disposed radially outside a crown portion of the carcass to define a tread face, wherein the loss tangent of the tread rubber is in a range of 0.40 to 0.60 under a temperature of 50 deg.C., the distance between the tread rubber and the adjacent cords of the radially outermost carcass ply is at most 1.0 mm, and the two cross plies include at least one ply of PEN cords made of polyethylene 2,6 naphthalate fibers twisted together.