Aramid fiber cord and method for manufacturing the same

Abstract

The present invention relates to an aramid fiber cord which has high strength as well as good disk fatigue property such that, when it is used as a tire reinforcement, the degradation of its physical properties and the degradation of its adhesion strength with respect to a rubber after long and high speed driving can be minimized, and to a method for manufacturing the same. The aramid fiber cord of the present invention comprises an aramid cabled yarn; and an adhesive coated on an outer surface of the aramid cabled yarn, wherein penetration rate of the adhesive into the aramid cabled yarn is 3.5 to 9%.

Description

TECHNICAL FIELD [0001]The present invention relates to an aramid fiber cord and a method for manufacturing the same, and more particularly, to an aramid fiber cord which has high strength as well as good disk fatigue property such that, when it is used as a tire reinforcement, the degradation of its physical properties after long and high speed driving can be minimized, and to a method for manufacturing the same.BACKGROUND ART [0002]A fiber cord, particularly a fiber cord treated with an adhesive, are widely used as a reinforcement for the rubber products such as tires, conveyor belts, V-belts, hoses and so on. The fiber cord may be made of nylon fibers, polyester fibers, rayon fibers and the likes. Among the important methods for improving the performance of the final rubber products is to improve the physical properties of the fiber cords which are used as the reinforcements therefor.[0003]A nylon fiber having high elongation and tenacity is generally used for the tires of the he...

AI Technical Summary

Benefits of technology

[0019]The aramid fiber cord of the present invention satisfies the strength generally required of the tire cord for heavy vehicles, racing cars, aircrafts, agricultural vehicles and so on and, at the same time, has excellent disc fatigue properties. Thus, if the aramid fiber cord of the present invention is used as a tire enforcement, the degradation of its physical properties after long and high speed driving can be minimized

Problems solved by technology

Since the nylon fiber has low modulus, however, it is not proper for the tires of the racing cars running at high speed and the sedan which requires good riding quality.

However, its heat resistance and adhesion strength with respect to a rubber are too low to be used for a tire of a car running at high speed.

Since the tenacity of the rayon fiber is remarkably lowered by moisture, however, it is required to exhaustively manage the moisture when a tire is manufactured.

Further drawback to it is lower tenacity compared to the price than those of other fibers.

However, since the aramid fiber has an inherent property of high modulus, the fiber cord manufactured using the same generally has very low fatigue resistance.

If a fiber cord having such low fatigue resistance is used as a tire enforcement, lots of problems as described below would occur.

Particularly, during a high speed driving, the tire is maintained at high temperature and high pressure for a long period of time, and thus the fiber cord for the tire enforcement is exposed to the fatigue conditions of high temperature and high pressure.

If the fatigue resistance of the fiber cord is low, the physical properties thereof, especially tenacity, are rapidly degraded due to the repetitive stretching / shrinkage, and thus the driving performance of the tire might be significantly degraded.

Further, in serious cases, the tire may burst during driving.

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