Mold for tire vulcanization and tire manufacturing method

Abstract

To provide a mold for tire vulcanization capable of avoiding defects of rubber chipping in a tire for a long period of time and ensuring good tire performance, and a method of manufacturing a tire using the mold. Make the surface roughness Ra of the groove forming portion (4) of the tread forming surface (3) smaller than the surface roughness Ra of the land portion forming portion (5), and in the groove forming portion (4), at least the main groove forming portion The surface roughness Ra in the range of (4a) is 0.12 μm or less and the minimum, the surface roughness Ra of the land portion forming portion (5) is 3.2 μm or more, and the tire vulcanization mold (1) is used to manufacture a green tire (TG) When cleaning the tread molding surface (3), the tread molding surface (3) is irradiated with laser light (L) to remove dirt (X) adhering to the tread molding surface (3).

Description

technical field [0001] The present invention relates to a mold for tire vulcanization and a method for manufacturing a tire. More specifically, it relates to a mold for tire vulcanization capable of avoiding defects such as rubber chipping in a tire for a long period of time and ensuring good tire performance, and using the mold for tire vulcanization The manufacturing method of the tire. Background technique [0002] On the molding surface of the mold for tire vulcanization, slight dirt from rubber components and compounding agents adheres every time vulcanization is performed. The dirt gradually accumulates due to repeated use of the mold, so if the dirt is left as it is, it will adversely affect the quality of the vulcanized tire. Therefore, it is necessary to properly clean the molding surface to remove dirt. As a method for cleaning a mold, there are known a shot blast cleaning method, a plasma cleaning method, a laser cleaning method, and the like. [0003] In the s...

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Problems solved by technology

[0004] However, when vulcanization is carried out using a mold cleaned with a laser, there is a problem that the vulcanized rubber adheres to and remains on the tread molding surface of the mold after the vulcanized rubber is released from the mold, and rubber defects occur in the manufactured tire (see Patent Document 1).

However, it is difficult to confirm whether or not the molding surface has the desired concave-convex state proposed in Patent Document 1 (the average interval between two adjacent convex portions is 4.7 μm or less).

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