Metallized film capacitors occupy an important position in the electronics industry due to their excellent performance and wide application. Understanding their manufacturing process and quality control measures is of great significance for optimizing the production process and improving product quality. The manufacturing process of metallized film capacitors mainly includes the following steps:
1. Material preparation: Select high-quality plastic film and metallized film as raw materials. Plastic film usually uses materials such as polypropylene (PP) and polyester (PET), and metallized film deposits a layer of metal on the plastic film through vacuum coating technology.
2. Film treatment: The plastic film is corona treated or chemically treated to increase its surface roughness and improve its dielectric properties. Then a uniform metal layer is formed on the plastic film through vacuum evaporation or sputtering technology.
3. Winding or lamination: According to the design requirements, the metallized film and the plastic film are arranged alternately to form a winding or lamination structure. This step requires precise control to ensure the electrical performance and mechanical stability of the capacitor.
4. Packaging and welding: The wound or laminated capacitor core is placed in the shell for packaging and welding. Packaging materials usually use epoxy resin, plastic, etc. to protect the internal structure of the capacitor from the external environment.

5. Testing and screening: Conduct comprehensive electrical performance tests on the manufactured capacitors, including capacitance, loss factor, withstand voltage test, etc., to ensure that each capacitor meets the specification requirements.

Quality control is crucial in the manufacturing process. The following are several common quality control measures:
1. Raw material inspection: Strictly inspect the purchased raw materials to ensure that they meet the quality standards.
2. Process monitoring: Set monitoring points in each manufacturing link to monitor process parameters in real time to detect and correct quality problems in a timely manner.
3. Finished product inspection: Conduct comprehensive inspections on the final product to screen out unqualified products and ensure the quality of the shipped products.
4. Reliability testing: Conduct long-term reliability tests on some products to evaluate their performance in actual use and provide data support for improving the production process.
Through strict manufacturing processes and quality control measures, metallized film capacitors can meet the requirements of high performance and high reliability and meet the needs of various electronic devices.