In the production process of copper core wire and cable, many people pay attention to the purity of the conductor and the drawing process, but easily overlook a key detail - the cooling and wire winding control after single wire annealing. In fact, if the copper wire is not handled properly in this stage, it is easy to encounter the problem of “uneven hardness”, which directly affects the subsequent twisting, conductivity, and finished product quality.

For copper core wires and cables, the main function of annealing is to eliminate the stress on the copper wire after stretching, allowing the conductor to restore good flexibility. If the cooling control after annealing is unstable, the surface and internal structure of the copper wire may change, ultimately leading to uneven hardness of the same batch of copper wire.

The truly stable production of copper core cables requires very strict requirements for the cooling process.

Cooling speed control. The temperature of annealed copper wire is relatively high. If the temperature drops too quickly, it is easy to cause the internal stress of the copper wire to be re generated; Slow cooling may also lead to surface oxidation. Therefore, during the production process, it is necessary to accurately control the cooling water temperature and cooling time according to the specifications of the copper wire to ensure consistent softness and hardness of the copper wire.

Cleanliness management of coolant. If the coolant contains impurities or is not replaced for a long time, oxides are prone to adhere to the surface of the copper wire, which affects the quality of the subsequent conductor. High standard cable production enterprises usually regularly filter and maintain the circulating cooling system to ensure a smooth surface of the copper wire.

In addition to cooling, the winding process is also crucial.

If the tension control of the winding is unstable, it may lead to uneven local stress on the copper wire. Some positions are excessively stretched, while others are slightly loose, ultimately forming a situation of “coaxial but different softness and hardness”. During the subsequent twisting process, there may be issues such as wire jumping, wire breakage, and even insufficient roundness of the conductor.

Therefore, high-quality copper core cables usually use a constant tension control system when winding to ensure that each meter of copper wire is evenly stressed. Meanwhile, the neatness of the wiring also directly affects the stability of subsequent processes. If the winding is messy, it is not only easy to crush the copper wire, but also increases subsequent production losses.

In the conductor manufacturing process of the Pearl River Cable in Guangdong, strict standards have been established for key processes such as annealing, cooling and take-up. From copper material selection to production detail control, we always adhere to the quality requirements of stability, safety, and durability, ensuring that the flexibility and conductivity of the copper core remain in good condition.

The the Pearl River Cable can not be separated from the precise control of each process. Only by truly paying attention to the cooling and winding details after annealing can we effectively avoid “uneven hardness” and make the cable more stable and reliable in long-term use.