Core Control Plan for the Pinning & Winding Process of Capacitors

In the overall production process of capacitors, the pinning and winding process serves as the core link for quality control. According to industry statistics, quality issues caused by this process account for 80% of the total quality problems of capacitors. Among them, the refined control of the winding stage is critical to determining product quality. For this reason, major capacitor manufacturers have established dedicated control systems accordingly.

As a company deeply engaged in cutting-edge industry technologies, we have adopted an industry-leading full-process pinning and winding control model. Through multiple measures such as equipment upgrading, process optimization, and intelligent inspection, we control product quality from the source. The core control features are as follows:

The riveting process is fully equipped with a pre-punching device. Compared with the traditional riveting process, this device effectively increases the contact area between aluminum foil and guide pins, optimizes the electronic conduction path, and reduces contact impedance. It fundamentally eliminates defects such as aluminum foil breakage and cracks, ensures the integrity of the core’s basic structure, and lays a stable foundation for subsequent winding and assembly processes.

For the key riveting area, our exclusive composite protection technology of lining foil and lining paper is adopted. The double-layer lining strengthens the insulation and structural strength of the riveting part, greatly improving the voltage resistance of the product at the riveting position. It also enhances the product’s ripple impact resistance, effectively delays heat aging of components, significantly extends the overall service life of capacitors, and adapts to high-load and long-cycle application scenarios.

The wound core adopts a dedicated exposed negative electrode process. Through innovative structural design, the product’s heat dissipation area is expanded, solving the problem of poor heat dissipation in traditional winding processes. It further improves the product’s capacity to withstand ripple current, prevents performance degradation caused by high-temperature loss, and ensures stable and continuous operation of the product under complex working conditions.

CCD intelligent visual inspection systems are installed on all production machines, realizing real-time monitoring and precise control of all product dimensional parameters in strict compliance with various dimensional standards. This intelligent inspection method replaces traditional manual sampling inspection, completely reducing the defect rate caused by human operational errors. At the same time, it ensures dimensional consistency of the same batch and all batches of products, making the product’s electrical performance more stable and quality more controllable.

Centering on the pinning and winding process, our company has established a three-dimensional control system featuring refined equipment maintenance, advanced intelligent inspection, and standardized personnel management. We continue to iterate and optimize the production process, which not only steadily improves the quality stability and overall performance of capacitor products, but also precisely solves the pain points of downstream customers in terms of product durability, ripple resistance, and consistency, creating high-quality benchmark products for the industry.