Film capacitor manufacturing process and requirements

We all know that a film capacitor is a capacitor made of a metal foil as an electrode and a plastic film such as polyethylene, polypropylene, polystyrene or polycarbonate, which is folded from both ends and then wound into a cylindrical shape. But do you know what its production process is like? And what are the requirements when making? Let's talk to you below.

1. Cutting film: The metal foil is cut into the required design width by a slitting machine according to the capacity of the product design. It is required to have no burrs when cutting, and the appearance is free from dirt and wrinkles.

2. Winding: According to the requirements of the process, the needle core and the metal film are selected, and the core is wound by a winder. The film capacitor capacity is required to meet the design requirements, and the core end face is flat and the film is clean and the tension is moderate, and the film cannot be scratched.

3. Hot pressing: According to the requirements of the process, select the appropriate hot pressing parameters (pressure, temperature, time) on the hot press to flatten the core. It is required that the core cannot be loosened when a slight external force is applied, and the film cannot be layered.

4. Tape: According to the requirements of the process, select the appropriate adhesive tape and wind the core into a roll. The adhesive tape is required to be good in adhesion, and the adhesive tape cannot cover the end face of the core.

5, spray gold: spray metal layer on both ends of the core. According to the requirements of the process, choose the distance of gold spray, air pressure, and wire speed. The thickness and adhesion of the sprayed gold are required to meet the requirements.