Flexible circuit boards (also known as FPCs or soft boards) are characterized by their lightweight and short size, making them prone to discounts, scratches, and other defects during use. Low mechanical strength, easy to tear and crack. The purpose of adhesive reinforcement materials is to enhance the mechanical strength of FPC and facilitate surface mounting of parts. There are various types of reinforcement sheets, which vary depending on the requirements of the product, mainly including PET, PI, adhesive backing, metal or resin reinforcement plates, and so on. Reinforcement steel sheets are attached to a certain area of the FPC flexible circuit board to increase the hardness of that area. Some of them play a conductive and inductive role, such as the reinforcement steel sheets on the back of the camera module sensor, which are used to increase the hardness and thickness of the area for SMT packaging. The thickness of FPC steel sheet reinforcement is generally 0.1mm/0.15mm/0.2mm/0.25mm/0.3mm, and so on. The commonly used materials for FPC reinforcement steel sheets include stainless steel 304/301, and so on. Nowadays, almost all high-end digital intelligence around the world have the presence of FPC. Where there are people, there is the world, and where there is FPC, steel sheet reinforcement may be necessary