METHOD FOR MANUFACTURING PNEUMATIC TIRE
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United States of America Patent
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Issued Date -
Oct 22, 2015
app pub date -
Oct 31, 2012
filing date -
Jan 20, 2012
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Abstract
A manufacturing method using a rigid core, wherein high-speed endurance performance is enhanced while breakage of band cords is suppressed. This method for manufacturing a pneumatic tire includes a green tire formation process for forming a green tire by affixing tire-constituting members in sequence to a rigid core. The green tire formation process includes a band ply formation step for winding a ribbon-shaped strip in which a band cord sequence is coated with a topping rubber into a helical shape. The band cord comprises a composite cord in which first strands of aramid fiber and second strands of heat-shrinkable organic fiber are twisted together. The stress-elongation curve of the composite cord has a low-elasticity region from the origin to the inflection point, and a high-elasticity region past the inflection point. The elongation of the composite cord is in the range of 0.9-3.3% at the inflection point, and the modulus of the composite cord is in the range of 11-31 N/% in the low-elasticity region.
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