Bridgestone Corporation

Toshiro Iwata

Seiichiro Iwafune

Hiroshi Mouri

Yasuyoshi Kawaguchi

Michio Ishii

Kazuhisa Nishigai

Iwami Nagata

Akira Hatakeyama

Kojiro Yamaguchi

Eiji Takiguchi

Seizo Ichikawa

Kuninori Mitarai

Hideo Hisatomi

Toshihide Kosoegawa

Kikuo Oka

A screw for a double-shaft extruding device having a shaft and a spiral flight provided at an outer periphery of the shaft. A height of the flight from an axis of the shaft is substantially constant. An angle of torsion of a spiral of the flight becomes smaller toward a shaft distal end. A cross-sectional area of extrusion formed by the shaft and the flight continuously increases from the shaft distal end to a shaft proximal end. Material can be smoothly discharged and completely extruded.

Screw for double-shaft extruding device and double-shaft extruding device

Herein disclosed is a pneumatic tire which comprises a case and a tread which covers a crown portion of the case. The tread includes a foamed rubber which has a volume not less than 10% of that of the entire of the tread, and the foamed rubber is formed of a rubber composition which contains rubber components each having a glass transition point not higher than -60.degree. C.

Pneumatic tire with foam rubber in the tread

A pneumatic tire having excellent tire performances in winter and summer seasons comprises a tread, a part of which is comprised of an expanded rubber in a volume corresponding to at least 10% of the total volume of the tread at its surface. This expanded rubber contains particular rubber component and particular high reinforcing carbon black and oil, and has particular number of closed cells having a specified cell diameter to the total number of closed cells. Furthermore, a rubber reinforcing layer is arranged near to the tread shoulder.

Pneumatic tire having expanded outer tread rubber layer

Pneumatic tire having foamed tread rubber

In a method of controlling a tire vulcanization by controlling a heat supply to a vulcanizing machine including a mold unit and a bladder unit, temperatures at points on a boundary between the mold unit and a tire are measured by means of temperature sensors, a temperature at a center post assembly of the bladder unit is measured by a temperature sensor arranged at the center post assembly. The method includes calculating temperature profiles within the tire from the measured temperatures by using the finite difference method, estimating vulcanization profiles within the tire from the temperature profile, deriving the least vulcanization within the tire from the vulcanization profiles, and producing a stop signal for the heat supply to the vulcanizing machine in accordance with the least vulcanization thus derived.

Method of measuring temperature within cured article and method of

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Musashimurayama, Japan

Toshiro Iwata