The production of high-quality FPC requires strict control over multiple environments such as material selection, process flow, equipment accuracy, and quality control. The following are the key steps and technical points:

1. Material selection and optimization, including centralized procurement selection, copper foil selection, covering film, adhesive, etc.

2. Design and process optimization, including circuit design, exposure and development in process control, etching, coating adhesion, surface treatment, etc.

3. Key process control points, including drilling and punching, hot pressing lamination, and strengthening of bending areas.

4. Quality control and testing, including AOI testing, impedance testing, bending testing, environmental reliability testing, etc.

5. Production environment and equipment, including clean workshops, temperature and humidity control, equipment calibration, etc.

6. Common problems include copper foil detachment, bubble coating, and circuit breakage.

The core of high-quality FPC lies in the combination of material matching, process stability, and equipment accuracy. It is recommended to optimize relevant key parameters (such as pressing temperature, etching time) through DOE (experimental design) and establish SPC (statistical process control) system to monitor yield. At the same time, for high-frequency and high-speed applications, additional attention should be paid to the stability of dielectric constant and loss factor.