Bladder and tire producing method
First Claim
1. A bladder used to press the inner wall surface of a tire by means of a pressurized heating medium during the vulcanization of a green tire, comprising at least one rubber layer and at least one fabric layer, wherein elongation rates of the fabric layer in warp direction and in weft direction both exceed 15% and satisfy following equation (1):
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Accused Products
Abstract
An object of the present invention is to provide a bladder which is unlikely to have a shapal variation along the inner wall surface of the tire and can satisfactorily extend along the inner wall surface of the tire. An inventive bladder is used to press the inner wall surface of the tire by a pressurized heating medium during the vulcanization of a green tire and is comprised of a fabric layer (purl stitched fabric layer 12) and rubber layers (silicone rubber layers 11, 13) placed one over another. Elongation rates of the fabric layer in warp direction and in weft direction both exceed 15% and satisfy: 0.4≦elongation rate in weft direction/elongation rate in warp direction ≦6.0. Since the fabric layer has good extensibility, it can elongate with the rubber layers.
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Citations
15 Claims
- 1. A bladder used to press the inner wall surface of a tire by means of a pressurized heating medium during the vulcanization of a green tire, comprising at least one rubber layer and at least one fabric layer, wherein elongation rates of the fabric layer in warp direction and in weft direction both exceed 15% and satisfy following equation (1):
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15. A tire producing method, comprising the steps of:
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placing a bladder inside a green tire set in a mold, and supplying a pressurized heating medium to the inside of the bladder to vulcanize the green tire while pressing it against the inner wall surface of the mold, wherein the bladder comprises at least one rubber layer and at least one fabric layer, and elongation rates of the fabric layer in warp direction and in weft direction both exceed 15% and satisfy following equation (1);
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Specification