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Processing of steel to give brass-plated high tensile cord suitable for tire reinforcement is lengthy and involves many processes, each requiring a specialized high capital cost plant and a multiplicity of technologies.
The production route adopted is necessary to provide a high quality product capable of giving trouble-free tire manufacture followed by service in tires without failure attributable to the steel cord.
Examination of the route suggests that some simplifications in the final stages of cord making is possible now that machines capable of aggregating up to four wires simultaneously at the wire drawing stage are available.
Multiple drawn wires (twins, triples, and quads) feeding final cord making machinery can give directly without any intermediate stranding operation 1 × n × 0.x mm combinations (where n = number of wires or filaments, and x = wire or filament diameter) such as 1 × 28 × 0.x mm type cords equivalent to the standard 1 × 4 + 6 × 4 × 0.x mm products.
Indications are that properties and manufacturing costs of cords made in the manner outlined compare favorably with cords made by the normal method.
In cooperation with Dunlop Limited, two such products, 3 × 10 × 0.175 mm replacing 1 × 3 + 5 × 7 × 0.15 + 1 × 0.15 mm and 1 × 14 × 0.175 mm replacing 1 × 3 + 6 × 3 × 0.15 mm, have been used successfully in truck tires for a number of years, confirming that bunch-type cords are capable of functioning and meeting the needs of a reinforcing material in tires.
steel, wire, cord, processing, mechanical properties, reinforcement, tires, trucks
Technical manager, Steel Cords Limited, Derby,