How to choose protective film for FPC flexible circuit board

Flexible circuit boards are prone to electrostatic breakdown during production. At present, this problem mainly relies on the anti-static mat on the market, and the product is added to the surface of the table pad by the electrostatic agent, and then absorbs the air water molecules to form a conductive path, thereby having an antistatic effect on the FPC flexible circuit board, and at the same time The product is susceptible to environmental factors such as air and humidity, and the electrostatic discharge effect is poor. Especially in the dry climate in the north, the surface resistance value increases. As time goes by, the anti-static index decays more and more quickly, resulting in unstable electrostatic discharge, which easily breaks down the line chip on the FPC flexible circuit board, causing damage to the equipment operation. At the same time, the product can not be carried along with the FPC board, and can not play the role of protection at any time.

   FPC flexible circuit boards are now in a small but fast-growing development. The polymer thick film process is an efficient, low-cost production process. The process selectively screens conductive polymer inks on inexpensive flexible substrates. A representative flexible substrate is PET. Polymer thick film conductors include silk screen metal fillers or carbon powder fillers. The polymer thick film process itself is very clean, using lead-free SMT adhesives, without etching. Due to the use of the addition process and low substrate cost, the polymer thick film method is 1/10 of the price of the copper polyimide film circuit; it is 1/2 to 1/3 of the price of the rigid board. The polymer thick film method is especially suitable for the control panel of the device. In mobile phones and other portable products, the polymer thick film method is suitable for converting components, switches and lighting devices on printed circuit boards into polymer thick film circuits. It saves costs and reduces energy consumption.

   Anti-static PET protective film is widely used in “flexible circuit board”. Performance: transparent anti-static PET protective film is relatively soft, similar to FPC board hardness, and transparent to observe FPC surface process requirements, and not with Outside air contact, of course, will not generate static electricity and dust. Since the antistatic protective film has an antistatic coating on both sides, no static electricity is generated when it is separated from the FPC board, and of course, the chip of the circuit on the FPC flexible circuit board is not broken. This not only solves the static electricity generated during the transportation of the FPC board, but also can be bonded and transparent without being affected by environmental factors such as air and humidity.