Device for producing an unvulcanized rubber member for tire manufacturing

Abstract

The present invention provides an unvulcanized rubber member for tire manufacturing. The member forms at least a portion of a green tire, and features: multiple rib-protrusions that extend in a direction corresponding to a circumferential direction of the tire, and multiple grooves that extend in a direction corresponding to a radial direction of the tire and intersect the rib-protrusions. In accordance with the present invention, during vulcanization of the tire, the unvulcanized rubber member for tire manufacturing can efficiently expel air at the interior of the unvulcanized tire and between the unvulcanized tire and a vulcanizing mold.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an unvulcanized rubber member for tire manufacturing, a device for producing the unvulcanized rubber member for tire manufacturing, and a method of producing the unvulcanized rubber member. [0003] 2. Description of the Related Art [0004] When a molded unvulcanized tire is charged into a vulcanizing mold and then vulcanized, defects referred to as “lights” may appear on the surface of a fabricated tire after vulcanization. As a result, a problem is caused in that the external appearance of the fabricated tire deteriorates and the commercial value thereof decreases. “Lights” are generally produced due to air remaining between the unvulcanized tire and the vulcanizing mold. [0005] Further, when a molded unvulcanized tire is charged into a vulcanizing mold and then vulcanized, a defect may occur in that air remains at the interior of the fabricated tire after vulcanization. Due to this d...

AI Technical Summary

Benefits of technology

[0018] In view of the aforementioned facts, an object of the present invention is to provide an unvulcanized rubber member for tire manufacturing, in which air at the interior of an unvulcanized tire and / or air between the unvulcanized tire and a vulcanizing mold can be efficiently expelled during tire vulcanization, and a device for producing the unvulcanized rubber member for tire manufacturing.

[0021] When the rib-protrusions that extend in the circumferential direction of the tire and the grooves that extend in the radial direction of the tire are provided in the unvulcanized rubber member for tire manufacturing so as to intersect each other, a deficiency in that directions in which air is expelled are limited during vulcanization is mitigated, whereby air remaining at the interior of the green tire and air between the green tire and the vulcanizing mold are allowed to be expelled efficiently.

[0031] If the width of the groove is less than 0.2 mm, the groove will be filled up at the initial stage after starting the tire vulcanization, whereby the effects of air-bleeding is significantly deteriorated. On the other hand, if the width of the groove is more than 1.5 mm, a middle portion of the groove will rise to a shallow depth, whereby the effects of air-bleeding is decreased.

Problems solved by technology

When a molded unvulcanized tire is charged into a vulcanizing mold and then vulcanized, defects referred to as “lights” may appear on the surface of a fabricated tire after vulcanization.

As a result, a problem is caused in that the external appearance of the fabricated tire deteriorates and the commercial value thereof decreases.

Further, when a molded unvulcanized tire is charged into a vulcanizing mold and then vulcanized, a defect may occur in that air remains at the interior of the fabricated tire after vulcanization.

Due to this defect or air void, a problem is caused in that performance and quality of the fabricated tire are deteriorated and the commercial value of the fabricated tire is decreased.

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