US 12,000,086 B2
Compact steel cord
Xiang Liu, Jiangsu (CN); Aiping Wang, Jiangsu (CN); Weiming Ma, Jiangsu (CN); Nianpeng Zhao, Jiangsu (CN); Xianghui Liu, Jiangsu (CN); Zengguang Ke, Jiangsu (CN); and Hengxiang Cao, Jiangsu (CN)
Assigned to Jiangsu Xingda Steel Tyre Cord Co., Ltd., (CN)
Appl. No. 17/766,458
Filed by Jiangsu Xingda Steel Tyre Cord Co., Ltd., Jiangsu (CN)
PCT Filed May 20, 2021, PCT No. PCT/CN2021/094764
§ 371(c)(1), (2) Date Jul. 21, 2022,
PCT Pub. No. WO2022/151623, PCT Pub. Date Jul. 21, 2022.
Claims priority of application No. 202110054964.4 (CN), filed on Jan. 15, 2021.
Prior Publication US 2024/0068159 A1, Feb. 29, 2024
Int. Cl. D07B 1/06 (2006.01); D07B 1/16 (2006.01)
CPC D07B 1/0633 (2013.01) [D07B 1/0666 (2013.01); D07B 1/162 (2013.01); D07B 2201/1036 (2013.01); D07B 2201/1052 (2013.01); D07B 2201/2006 (2013.01); D07B 2201/2037 (2013.01); D07B 2201/2051 (2013.01); D07B 2501/2046 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A compact steel cord, comprising a core-filament I steel wire with a diameter of d0, and four middle-layer M steel wires with a diameter of d1 and eight outer-layer O steel wires with a diameter of d2 that are twisted around the core-filament I steel wire in a same lay direction and a same lay length, wherein
gaps L are reserved between the outer-layer O steel wires, an average width of the gaps L is not less than 0.02 mm, and a total size of the gaps L is larger than d0 and smaller than d1;
tensile strengths of the core-filament I steel wire, the middle-layer M steel wire and the outer-laver O steel wire are respectively Ts1, Ts2, and Ts3, which satisfy the following relationships:
50 Mpa<(Ts2−Ts1)<400 Mpa; and
0 Mpa≤(Ts3−Ts2)<400 Mpa.