Patent ID: 6093267
Filing Date: 2000-07-25
Classification: B60C,C21D,D07B,Y10S,Y10T

Abstract:
A method of preparing a rubber tire reinforcing cable for embedding in a tire rubber in which, starting from a cable which includes an assembly of work-hardened steel wires, the carbon content of which is between 0.4% and 1.0%, covered with an adherent coating favoring adhesion between the steel and the tire rubber, the method comprising subjecting the cable to a recovery annealing heat treatment at a temperature between 250.degree. C. and Ac.sub.1 for a period of time to bring the operational elongation rate A.sub.f to a value of more than 4%, and subjecting the cable to means for limiting the decline in the cable's ability to adhere to rubber such that, measured by the ability of such cable to adhere by vulcanization to a ""test"" rubber mix before the preparation of the cable by the heat treatment and the subjecting of the cable to the means for limiting the decline in the cable's ability to adhere to rubber and after such preparation of the cable, the decline in adherence observed is less than or equal to a test threshold value, the test mix being more sensitive to variations in the coating on the cable than said tire rubber and said test mix being formulated so that said test threshold value is greater than the decline observed with said tire rubber.