PCB Technical - What kind of protective film is used to protect the flexible circuit board FPC board

What kind of protective film is used to protect the flexible circuit board FPC board? Anti-static PET protective film is the most suitable for dust-proof, dirt-proof and anti-static, and effective bonding to the board surface.

Flexible circuit board protective film

Flexible circuit board, also known as "soft board", or FPC board, is a printed circuit made of flexible insulating substrate.

Flexible circuits provide excellent electrical performance, can meet the design needs of smaller and higher-density installations, and also help reduce assembly processes and enhance reliability.

Flexible circuit boards are the only solution to meet the miniaturization and mobile requirements of electronic products. It can be bent, wound, and folded freely, can withstand millions of dynamic bending without damaging the wire, can be arranged arbitrarily according to the space layout requirements, and can move and expand in three-dimensional space, so as to achieve the integration of component assembly and wire connection change.

Flexible circuit boards can greatly reduce the volume and weight of electronic products, and are suitable for the development of electronic products in the direction of high density, miniaturization, and high reliability.

Therefore, FPC boards have been widely used in aerospace, military, mobile communications, laptops, computer peripherals, PDAs, digital cameras and other fields or products.

However, FPC boards are prone to electrostatic breakdown during the production process.

At present, the solution to this problem mainly relies on anti-static table mats on the market, and the product relies on the addition of electrostatic agent and migrates to the surface of the table mat, and then absorbs air and water molecules to form a conductive path, thereby having an anti-static effect on the FPC board. At the same time, the product It is easily affected by environmental factors such as air and humidity, and the electrostatic discharge effect is poor.

It is understood that in the dry climate areas of the north, the surface resistance value increases. As time goes by, the anti-static index decays faster and faster, resulting in unstable electrostatic discharge, which will easily break down the circuit chips on the FPC board and cause equipment operation damage.

At the same time, the product cannot be transported with the FPC board, and it cannot play a protective role at any time. The defects in the application link are already very obvious, and it can no longer meet the requirements of the current FPC board development technology.

The FPC board is now in the process of small but rapid development. The polymer thick film method is an efficient and low-cost production process.

This process selectively screen-prints conductive polymer inks on inexpensive flexible substrates. Its representative flexible substrate is PET.