Manufacturing a car air filter involves several steps, including:

1. Material selection: The most commonly used material for car air filters is paper. However, some filters are made from synthetic materials, such as foam or fiberglass. The material must be durable, lightweight, and able to filter out small particles.
2. Cutting: The selected material is cut into the desired shape and size using cutting machines or laser cutters.
3. Pleating: The material is then pleated using specialized machines. Pleating increases the surface area of the filter, allowing for more airflow and better filtration.
4. Sealing: The pleated material is sealed together using heat or adhesive to form a tight seal
5. Frame assembly: The pleated material is then placed inside a frame or housing, which is typically made from plastic or metal.
6. Quality control: The finished filters are inspected to ensure that they meet the required standards for efficiency, airflow, and durability.
7. Packaging: The filters are packaged and shipped to distributors or directly to automobile manufacturers.The manufacturing process of car air filters may vary depending on the type of material used and the specific design requirements.