Patent ID: 6514447
Filing Date: 2003-02-04
Classification: B29C,B29D

Abstract:
A vulcanizing method of a pneumatic bias tire having an aspect ratio Y of 25% or more and 55% or less from an unvulcanized tire, the aspect ratio Y being a tire sectional height H divided by a tire sectional width W times 100%, the vulcanizing method comprising the step of:expanding a rubber-made bladder from an inside of the unvulcanized tire in metallic molds, wherein a bladder stretch ratio X of a tire inner surface diameter when the unvulcanized tire is pressed to the inner surfaces of the metallic molds by means of expansion of the bladder relative to an outer diameter of the bladder when it is not expanded is set in a range expressed by the following expression: X=&bgr;âˆ’Y/&agr;, where 0.37