What are the types of FPC cover films?
Flexible Printed Circuit (FPC), as the only type of PCB that can be bent, is widely used in various high-precision and high-tech fields. In the production process of FPC, cover films are commonly used to protect the surface from damage, contamination, and oxidation corrosion. This article will introduce the various types of cover films used for FPC.
1. PI Cover Film:
Polyimide (PI) cover film is the most common type used for FPC. As a plastic material with excellent high-temperature resistance, it possesses outstanding properties such as high-temperature resistance, electrical insulation, and abrasion resistance. It is suitable for surface protection in high-precision electronic products such as chip packaging and flexible circuit boards.
2. PET Cover Film:
Polyethylene terephthalate (PET) is another commonly used material for FPC cover films. PET cover films exhibit good high-temperature resistance and chemical resistance, making them suitable for surface protection in chip packaging and flexible circuit boards.
3. PI+PET Composite Cover Film:
The PI+PET composite cover film is produced by combining PI and PET materials. The two materials are mixed in a certain proportion, melted, extruded, and stretched to form a transparent film. This type of film combines the advantages of PI and PET, offering higher high-temperature resistance, better electrical insulation, mechanical strength, and maintaining high transparency. It is often used for surface protection in high-precision electronic products.
4. Polyester Film (Mylar):
Polyester film is a transparent and flexible film made from polyester material. It provides excellent protection, processing performance, durability, and electrical insulation. It effectively shields the FPC surface from mechanical damage, contamination, and oxidation corrosion.
These are the common types of FPC cover films. It is important to note that different types of FPC cover films have distinct characteristics and applications, so the selection should be based on specific requirements.