Pneumatic tire manufacturing method and pneumatic tire

Abstract

A method of manufacturing a pneumatic tire has a winding step of forming a rubber ribbon winding body constructing a tread rubber by spirally winding a rubber ribbon obtained by co-extruding a first rubber and a second rubber which are different in hardness. The first rubber is mainly arranged in a first area by making a cross sectional area ratio of the first rubber greater than that of the second rubber. The second rubber is mainly arranged in a second area by making the cross sectional area ratio of the first rubber smaller than that of the second rubber. A portion in which the cross sectional area ratio of the first rubber becomes smaller by smaller is provided from the first area toward the second area. The rubber ribbon retaining a compound interface is superposed and wound to at least a part of the second area.

Description

technical field

[0001] The present invention relates to a method of manufacturing a pneumatic tire including a process of molding tread rubber by a belt-to-roll method, and a pneumatic tire manufactured by the manufacturing method. Background technique

[0002] As disclosed in Patent Documents 1 and 2, it is known to divide the tread rubber into a plurality of regions in the tread width direction and arrange rubbers having different hardness or coefficients in these regions.

[0003] Figure 8 Shown is the tread rubber 80 divided into three parts, namely, a center region serving as a central portion in the tread width direction, and a pair of shoulder regions serving as end portions in the tread width direction. This division of the tread promotes performance sharing in the center region and the shoulder region, whereby a high balance of opposite performances can be achieved. For example, in the tire described in Patent Document 1, hard rubber is arranged in the center regi...

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