Rigid inner mold for forming tire, and method of manufacturing tire using the same
AssigneeSumitomo Rubber Industries, Ltd.
InventorKei Kohara
Life of this patent
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Abstract
In an inner mold method, a pull-out force of extracting inner mold segments from a vulcanized tire is reduced. A rigid inner mold 1 is provided with an annular inner mold body 2 having a tire molding surface S. A rigid core 1 is put into a vulcanization mold B for each green tire T formed on the tire molding surface S, whereby the green tire T is vulcanization-molded between the vulcanization mold B and the inner mold body 2. The inner mold body 2 comprises a plurality of inner mold segments 5 divided in the circumferential direction. A coating layer 11 having rubber release property is formed on the tire molding surface S.
Claims20
A rigid inner mold for forming a tire, comprising:
- an annular inner mold body comprising a plurality of inner mold segments divided in-the circumferential direction and having a tire molding surface configured to form a green tire, the annular inner mold body being configured to be put into a vulcanizing metallic mold with the green tire such that the green tire is vulcanized between the vulcanizing metallic mold and the annular inner mold body,
- wherein the annular inner mold body comprises a coating layer formed on the tire molding surface and having rubber release property, and the coating layer comprises a plurality of coating layer portions having different hardness such that the coating layer portions are formed on different portions of the tire molding surface.
Dependencies are inferred from the claim text.