Steel cord for reinforcement of off-road tire, method of manufac

Textiles: spinning – twisting – and twining – Apparatus and processes – With wire or strand preforming or shaping

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Details

57 5849, 57 5852, 57138, 57902, D01H 1326, D02G 336

Patent

active

057222266

ABSTRACT:
A steel cord effective for reinforcing a super-large off-road tire wherein strands made by simultaneously twisting together 3 to 6 steel wires in the same twisting direction with the same pitch length are used and the steel cord is made by twisting together 3 to 6 such strands in the same direction as the twisting direction of the strands and with the same pitch length. Each of the steel wires constituting the strands continuously has a small wavy pattern of a pitch length smaller than the lay length of the strands and therefore each of the strands has a compound pattern comprising a wavy pattern formed by the twisting and said small wavy pattern and in a gap is formed between steel wires each of the strands by the small wavy pattern. The lay length P.sub.1 of the steel cord is 8 to 15 times the steel cord diameter D and the elongation on breakage by tension of the steel cord is over 5%.

REFERENCES:
patent: 4604861 (1986-08-01), Matsuur et al.
patent: 5287691 (1994-02-01), Okamoto et al.
patent: 5319915 (1994-06-01), Kobayashi et al.
patent: 5321941 (1994-06-01), Bollen et al.
patent: 5337549 (1994-08-01), Kobayashi et al.
patent: 5502960 (1996-04-01), Kobayashi et al.
patent: 5651246 (1997-07-01), Kusaba
patent: 5661966 (1997-09-01), Matsumaru

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