Textiles: spinning – twisting – and twining – Strand structure – Covered or wrapped
Patent
1995-03-21
1997-09-02
Stryjewski, William
Textiles: spinning, twisting, and twining
Strand structure
Covered or wrapped
57311, 57902, D02G 336
Patent
active
056619650
ABSTRACT:
A rubber article-reinforcing steel cord includes a core obtained by forming a single filament in a wavy shape, an inner sheath formed by arranging 5 to 6 filaments around the core, and an outer sheath formed by arranging 9 to 12 filaments around the inner sheath. The inner sheath and said outer sheath are twisted together. The diameter of each of the filaments of the inner and outer sheaths is not greater than that of the filaments of the core, 5d .ltoreq.L.ltoreq.3d and 1.2.ltoreq.H.ltoreq.d2.0d in which L and H are a wave length and a wave height of a wave shape of the waved filaments of the core, respectively, and d is a diameter of the filament of the core, and a ratio p.sub.3 /p.sub.2 between the twisting pitch p.sub.2 of the inner sheath and the twisting pitch p.sub.3 of the outer sheath is in a range of 1.4 to 2.5. A heavy duty pneumatic radial tire is also disclosed, which uses such steel cords in a belt.
REFERENCES:
patent: 4781016 (1988-11-01), Sato et al.
Research Disclosure, No. 327, Jul. 1991, Emsworth GB, pp. 552-558.
Research Disclosure, No. 175, Nov. 1978, Emsworth GB, pp. 26-27.
Bridgestone Corporation
Stryjewski William
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