What is protective film for flexible circuit board (FPC board) ?

- Apr 10, 2017-

Flexible circuit board FPC board with what protective film to protect? It is necessary to prevent dust and anti-static, but also effectively fit the board, anti-static PET protective film is the most appropriate.

Flexible circuit board, also known as "soft board", that is, FPC board. Printed circuit made of flexible insulating substrate. Flexible circuit provides excellent electrical performance, can meet the needs of smaller and higher density mounting design, but also help to reduce the assembly process and enhance reliability. Flexible circuit board is the only solution to meet the requirements of miniaturization and mobility of electronic products. Free bending, winding and folding, can withstand the dynamic bending of millions of times and without damage to the conductor can be arranged in accordance with the requirements of space layout, and any move in three-dimensional space and any expansion, so as to achieve the integration of components and assembly connecting wire; the flexible circuit board can greatly reduce the volume and weight of electronic products, the need for electronic products to the development of high density, miniaturization, high reliability direction.

Therefore, the FPC board has been widely used in the fields of aerospace, military, mobile communication, portable computers, computer peripherals, PDA, digital cameras and other products.

But in the production process, the FPC board is prone to electrostatic breakdown. To solve this problem mainly rely on anti static pad on the market, but this product by static agent Tim within and migrate to the pad surface, and then the air is absorbed water molecules to form a conductive path, thereby antistatic effect on FPC plate, while the product is easily affected by air humidity and other environmental factors, the effect of electrostatic discharge difference. Especially in the dry climate in the north area, the surface resistance value increased with the passage of time, anti-static index decay more quickly, caused by electrostatic discharge instability, so easy to breakdown FPC board circuit chip, resulting in equipment damage. At the same time, the product can not move along with the FPC board, can not play a protective role at any time. Defects in the application of the link has been very obvious, can not meet the current requirements of the development of FPC board technology.

Now FPC is in a small but rapid development. Polymer thick film method is an efficient and low cost production process. In this process, on the cheap flexible substrate, the selective screen printed conductive polymer ink. Its representative flexible substrate is PET. Polymer thick film conductor including screen printing metal filler or carbon filler. Polymer thick film method itself is very clean, use lead-free SMT adhesive, without etching. Because of the addition process and the low cost of the base material, the polymer thick film circuit is 1/10 of the price of the copper polyimide film circuit; the price of the rigid circuit board is 1/2 ~ 1/3. Polymer thick film method is especially suitable for equipment control panel. In mobile phones and other portable products, the polymer thick film method is suitable for converting components, switches and lighting devices on the printed circuit board into a polymer thick film circuit. It can save cost and reduce energy consumption.

Application of anti electrostatic PET protective film in the "on the market prospects are very broad, flexible circuit board properties: transparent antistatic PET protective film is soft, with hardness of FPC plate and almost transparent to the surface can be observed in the FPC process requirements, and not contacted with outside air, of course will not produce static electricity and dust. Since both sides of the anti-static protective film are provided with an antistatic coating, the static electricity can not be separated from the FPC board, and the chip on the FPC board can not be broken. This not only solves the FPC board in the process of static electricity, but also can be bonded and transparent without air, humidity and other environmental factors. The products can be widely used in the semiconductor industry, LCD industry, electronic equipment and electronic equipment industry, electronic and electrical, communication manufacturing, precision instruments, optical manufacturing, pharmaceutical industry and biological engineering and other industrial fields and high-speed rail cars, hospitals, families, office areas, used in industrial production workshop, laboratory, computer room, and hospital operation room, CT, CCU, ICU, X - ray room ward floor, table and wall panel etc..

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