Steel cord with reduced residual torsions
US10487448B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 2015 |
| Grant date | Nov 26, 2019 |
| Priority date | — |
| Expiry date | Jul 30, 2036 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD07B2501/2046
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A steel cord for reinforcing a breaker or belt ply in a rubber tire having a core group and a sheath group. The core group consists of two to four core steel filaments with a first diameter dc and the sheath group consists of one to six sheath steel filaments with a second diameter ds. The ratio dc/ds of the first diameter dc to the second diameter ds ranges from 1.10 to 1.70. The two core steel filaments are untwisted or have a twisting step greater than 300 mm. The sheath group is twisted around the core group with a cord twisting step in a cord twisting direction. The ratio of the difference in residual torsions of the core group and the sheath group to the difference in saturation level between the core group and the sheath group ranges from 0.10 to 0.65, preferably from 0.10 to 0.60.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.