Bridgestone Corporation

Shigeru Miyazaki

Shigeru Kaneko

Taizo Ito

Masaharu Oku

Akio Obayashi

Keishi Mineo

Noriyuki Iwanaga

Shigeaki Harada

A pneumatic tire production system comprises production lines each including a green tire building station for assembling unvulcanized members of pneumatic tires into green tires. The green tires are vulcanized at a vulcanizing station which includes at least one vulcanizing unit equipped with a plurality of vulcanizing molds. The number of the vulcanizing mold is determined so as to satisfy the vulcanizing capacity which is substantially equivalent to the number of green tires formed at the building station within a predetermined unit time. The system serves to minimize the intermediate stock amount of green tires due to minimized changeover between different types of tires to be alternately produced.

Production system for pneumatic tires

A method of manufacturing a rubber sheet with rugged patterns formed on one side surface portion includes the step of preparing an apparatus including a rotating roll having rugged patterns, a member having an arcuate inner surface radially spaced apart from an outer peripheral surface of the rotating roll, and a die. The arcuate inner surface is recessed away from the rotating roll and defines an arcuate compartment chamber together with the outer peripheral surface of the rotating roll. The arcuate compartment chamber, has an inlet port and an outlet port. The die is placed in such a manner to adjoin to the outlet port portion of the compartment chamber, the die having an inner edge portion which is radially spaced apart from the outer peripheral surface of the rotating roll and defines an extrusive clearance together with the outer peripheral surface. The method further includes the steps of feeding a feed rubber into the arcuate compartment chamber through the inlet port thereof, kneading the feed rubber in the compartment chamber and moving the feed rubber from the inlet port toward the outlet port, and extruding the rubber sheet made of the feed rubber from the compartment chamber through the extrusive clearance.

Method of manufacturing rubber sheet with rugged patterns formed on its

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Tokyo, Japan

Shigeru Miyazaki