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AssigneeBridgestone Corporation
InventorHara Hisakatu
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A method of manufacturing steel wire for reinforcement of rubber articles comprises the steps of passing a wire rod plated with brass, through a group of dies immersed in a lubricant containing phosphate in continuous wet processing, winding the resulting steel wire around a spool, mounting the spool on a pay of unit of a twister assembly, and drawing the steel wire by the use of one or more dies arranged between the pay of unit and twisting unit of the twister assembly and having an area reduction per die of at least 5%, to reduce the diameter of the steel wire. Phosphor compound in the coating film formed on the brass plating of the steel wire contains phosphor in the range of 0.2 to 0.9 mg/m2 and zinc oxide in the range of 20.0 to 70.0 mg/m2. Also, provided is a steel cord which comprises twisted steel wires. The initial adhesion of the steel wire or steel cord for reinforcement of rubber articles to rubber is well and economically improved, shortening the curing time and enabling economical production of rubber products.
A steel wire for reinforcement of rubber articles which has brass plating comprising 60-70 wt % of copper and 30-40 wt % of zinc and coating film comprising phosphorous compound and zinc oxide on the surface of the brass plating, wherein the amount of the phosphorous compound expressed in the amount of phosphorous per unit surface area is within a range of not less than 0.2 mg/m2 and not more than 0.9 mg/m2 and the amount of the zinc oxide per unit surface area is within a range of not less than 20.0 mg/m2 and not more than 70.0 mg/m2.
Dependencies are inferred from the claim text.