Sumitomo Rubber Industries Limited

Yoshikazu Tanaka

Naohiko Kikuchi

Ikuji Ikeda

Isamu Tsumori

Norio Taniguchi

Takuzo Iwata

Akira Minakoshi

Genichiro Ishikawa

A method of manufacturing a pneumatic tire comprises assembling unvulcanized rubber components to make a green tire, vulcanizing the green tire, and winding an unvulcanized rubber tape so that the windings collectively have a predetermined cross sectional shape for at least one of the unvulcanized rubber components to thereby make said at least one of the unvulcanized rubber components.

Method of manufacturing pneumatic tire

The present invention provides a studless tire excellent in performance on ice and snow in which digging friction is improved without losing adhesion friction. The studless tire has a tread comprising specific short fiber or plate-like material dispersed in diene rubber so as to be oriented in the tread thickness direction, wherein when measured at 25&#xb0; C. the tread has a complex elastic modulus E1 in the tread thickness direction, and the sheet has a complex elastic modulus E&#x3b1; in the extrusion direction and a complex elastic modulus E&#x3b2; in a 90&#xb0; direction from the extrusion direction, when the rubber composition is made into 2 mm sheets with a roller and these moduli fulfill the following equation,60&#x2266;(1&#x2212;&#x3b2;)/()&#xd7;100&#x2266;100and the tread has a specific tread rubber hardness. The tire is obtained using a tread prepared by extruding a rubber composition containing diene rubber and specific short fiber or plate-type material in a tube shape, thereby orienting the short fiber in the circumferential direction of the tube shaped rubber, then cutting the obtained rubber sheet parallel to the extrusion direction, rotating each piece 90&#xb0; and laminating.

Process for preparing rubber sheet and tread and studless tire using same

A method of manufacturing a rubber component for a pneumatic tire which comprises a process of overlap-winding at least one rubber tape into a target cross sectional shape for the rubber component, wherein each rubber tape has a thickness of from 0.3 to 3.0 mm and a width of from 5 to 40 mm, and an inner surface and/or an outer surface of the rubber component are defined by a surface layer made of windings of the rubber tape which windings are overlapped by a width WJ less than 75% of the rubber tape width but more than 1.0 mm.

Pneumatic tire and method of manufacturing rubber component therefor

A cord-embedded rubber tape, a tire component made by winding such a tape, and a pneumatic tire comprising such a tire component are disclosed, wherein the tape is made of unvulcanized rubber and at least one cord is embedded therein along the length of the tape. The unvulcanized rubber may include short fibers oriented in the longitudinal direction of the tape.

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Kobe, Japan

Yoshikazu Tanaka