General introduction about Sunshine’s flexible copper stranded wire
The raw material of Sunshine flexible copper stranded wire is high quality and high purity T2 copper rod, the copper content is 99.95‰, and the tin layer is 99.99% of Yuntin, which has better quality guarantee.
Sunshine’s flexible copper stranded wires are developed in different specification and material as per client’s requirement. These flexible copper stranded wires are specially designed for extra strength, flexibility and easy handling.
Flexible copper stranded wire is soft , good bending resistance, continuous strands, no lack of strands after annealing treatment during processing process. Sunshine flexible copper stranded wires meet the national standard requirement.
Sunshine flexible copper stranded wire is deeply trusted and supported by customers in all walks of life such as power transmission and distribution, electrified railway, ground line projects, industrial electric furnaces and so on.
What is flexible copper stranded wires？
The flexible copper stranded wire is often referred as annealed copper strand wire, soft copper stranded wire. Annealed copper stranded wire goes through the same drawing process as hard-drawn copper.
Flexible copper stranded wire is heat-treated soon after as part of the manufacturing process. The heat makes annealed copper easier to work with, bend and shap, thus be made into a “softer” and less brittle wire.
The basic technological process of flexible copper stranded wires
Copper rod → Copper rod inspection (according to gb/t3952-2008 electrical copper wire blank)→ Wire drawing (large drawing machine)→ Medium and small drawing (continuous annealing or tank annealing)→ Stranded (pipe stranding machine or bundling machine)→ Conductor stranding (pipe stranding machine, cage stranding machine, required to untwist)→ Finished product inspection (according to standard gb12970.2-2009)→ Packaging → storage.
The classification of flexible copper stranded wires
1. Classification by appearance:
Bare flexible copper stranded wires (TR3)
Tinned copper wire (TRX3)
2. Classification according to the state of soft and hard of copper:
copper stranded wires
flexible copper stranded wires
Hard drawn copper stranded wires
insulated flexible copper stranded wires
3. Model Specifications and meaning:
Example: TJR3-15/35
TJR3: flexible copper stranded wires
15: A single wire diameter 0.15mm
35: Cross-sectional area 35mm²
The sizes of flexible copper stranded wires
- TJR1-1 flexible copper stranded wires Cross-sectional area 0.10-1000mm²
- TJR2-2 flexible copper stranded wires Cross-sectional area 2.5-63mm²
- TJR3-3 flexible copper stranded wires Cross-sectional area 0.025-500mm²
- TJRX1-1 Tined flexible copper stranded wires Cross-sectional area 0.1-2.5mm²
- TJRX2-2 Tined flexible copper stranded wires，Cross-sectional area 2.5-63mm²
- TJRX3-3 Tined flexible copper stranded wires，Cross-sectional area 0.025-500mm²
Commonly used specification of flexible copper stranded wires
The flexible copper stranded wire adopts the high-speed cage stranding machine to untwist and twist, and adopts the unique patent process in the stranding process.
The finished product is round, straight, tight structure, no split phenomenon, can facilitate a variety of subsequent crimping and extrusion processing, etc.
What are the commonly used flexible copper stranded wire structures?
19 strands, 24 strands, 37strands, etc. The maximum cross-sectional area can be reached Up to 500mm².
| Nominal cross-sectional area | Calculate cross-sectional area | structure | Approximate outer diameter(mm) |
| 1mm2 | 0.99mm2 | 7*18/0.10 | 1.8 |
| 1.5mm2 | 1.48mm2 | 7*27/0.10 | 2.1 |
| 2mm2 | 1.98mm2 | 7*36/0.10 | 2.4 |
| 2.5mm2 | 2.53mm2 | 7*46/0.10 | 2.7 |
| 3mm2 | 2.97mm2 | 7*54/0.10 | 3.0 |
| 4mm2 | 4.03mm2 | 4*57/0.15 | 3.2 |
| 5mm2 | 5.03mm2 | 5*57/0.15 | 3.4 |
| 6mm2 | 6.06mm2 | 7*49/0.15 | 3.7 |
| 7 mm2 | 7.05mm2 | 7*57/0.15 | 3.9 |
| 8mm2 | 8.04mm2 | 7*65/0.15 | 4.1 |
| 10mm2 | 10.01mm2 | 7*81/0.15 | 4.5 |
| 12mm2 | 11.99mm2 | 7*97/0.15 | 5.0 |
| 16mm2 | 15.95mm2 | 7*3*43/0.15 | 6.5 |
| 20mm2 | 20.40mm2 | 7*3*55/0.15 | 8.0 |
| 25mm2 | 24.85mm2 | 7*3*67/0.15 | 8.5 |
| 35mm2 | 34.87mm2 | 7*3*94/0.15 | 10 |
| 50mm2 | 49.81mm2 | 10*3*94/0.15 | 12 |
| 70mm2 | 69.73mm2 | 14*3*94/0.15 | 14 |
What flexible copper stranded wires are used for ?
Flexible copper stranded wires is suitable for electrical equipment, electronic appliances or components wiring or these occasions with soft structure edge wire and cable conductor core.
Flexible copper stranded wire is a soft connection wire for electrical devices (such as transformers, electric furnaces) and electronic and electrical equipment and thyristor components for power transmission and distribution.
The flexible copper strand is made of round copper wire or tinned soft round copper wire. In the process of processing by toughening treatment, so that the finished product is soft, neat , beautiful.
Flexible-copper-stranded-wires are used as flexible jointing wire in electic transmission and distribution appliance(such as volt transformer, electric stove), electronic equipment and thyristor etc, it also could be used as grounding wire in electric working.
Packaging of flexible copper stranded wires
General shaftless packaging, 100m/roll.
According to customer’s demand of wood shaft packaging, it can greatly reduce the damage to the soft copper strand during transportation.