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Device for producing an unvulcanized rubber member for tire manufacturing

a technology of rubber parts and rubber parts, which is applied in the direction of tyre beads, transportation and packaging, and other domestic objects, can solve the problems of deterioration of the external appearance deformation of the surface decrease of the commercial value of the fabricated tire, so as to achieve efficient expulsion

Inactive Publication Date: 2005-08-11
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Effectively expels air from the tire interior and between the tire and mold, preventing surface defects and maintaining tire quality and appearance by creating sufficient air passages during the vulcanization process.

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.

Method used

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  • Device for producing an unvulcanized rubber member for tire manufacturing
  • Device for producing an unvulcanized rubber member for tire manufacturing
  • Device for producing an unvulcanized rubber member for tire manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045]FIG. 1A shows a cross section of a green tire 10 prior to vulcanization. In FIG. 1A, there are shown a sidewall portion structural member 12, a belt-cushion portion structural member 14, a bead-reinforcement portion structural member (bead filler) 16, a tread portion structural member 18, a carcass 20, a belt 22, and a bead core 24. Further, FIG. 1B is a schematic perspective view of the entire green tire including the portions shown in FIG. 1A (however, only structures necessary to understand FIG. 1A are shown).

[0046] As shown in FIG. 2, a plurality of grooves 28 which extend along a direction corresponding to a radial direction of a tire (direction of arrow X), and a plurality of rib-protrusions 30 that intersect the grooves 28 and extend in a direction corresponding to a circumferential direction of the tire (direction of arrow Y) are formed on a surface of the sidewall portion structural member 12 formed of unvulcanized rubber (i.e., a surface of the side wall portion str...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B29C48/12B29C48/30B29C48/35B29C59/04B29C69/02B29D30/06B29D30/72B29K21/00B29L30/00
CPCB29C47/00B29C47/003B29C47/0033B29C47/0038B29C47/02B29C47/32Y10T428/2457B29D30/72B29D2030/582B29K2021/00B29K2105/246B29L2030/00B29C59/04B29C48/15B29C48/00B29C48/12B29C48/13B29C48/001B29C48/35
Inventor NOBUYOSHI, SHIMAZAKI
Owner BRIDGESTONE CORP
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