Sumitomo Rubber Industries Limited

Norikatsu Nakata

Masayuki Sakamoto

Kazumi Yamazaki

Hideki Otsuji

Yutaka Yoshida

Touru Fukumoto

Akio Hakamada

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 bodyis aligned with a formerThe ring-like base bodyrelatively approaches and separates from a formerThe ring-like base bodyincludes pasting meanswhich pastes a tread ring A to a raw tire base body B. The pasting meansincludes a grasping toolhaving a plurality of segmentswhich abut against an outer peripheral surface of the tread ring A to grasp the tread ring A. The pasting meansalso includes a pushing-down pasting toolhaving an annular rubber tube bodyThe rubber tube bodyis disposed on each side of the segmentand 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.

Raw tire forming apparatus and raw tire forming method

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.

Bias tire with specified tread rubber loss tangent

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Kobe, Japan

Norikatsu Nakata