Flexible PCB printing are like super flexible wires which allow the circuit to twist, bend, and fold just like a sheet of paper and even sustain the twists and turns with ease. The design of this circuit board is like a build blocks, with various materials bonded together in many layers to build a lightweight and flexible circuit system.
The structure of a flexible circuit board
1. The thickness of the base material
Let's talk about the base material first. This is the main part of the circuit board, usually made of PI or polyester. The thickness of the base material is generally between 12μm and 125μm. So, if you want to make a super flexible circuit board, the base material must be thinner; if you want it to be stronger, it must be thicker.
2. Thickness of copper foil
Copper foil is the metal layer used for conducting electricity on circuit boards. The thicker the thickness, the better the conductivity, but it also increases the overall thickness and stiffness of the board. The thickness of the copper foil largely determines the flexibility of the board.
Common copper thicknesses used in FPCB manufacturing include:
- 12μm (0.5 oz): A very thin layer suitable for low-current applications or highly flexible designs.
- 18μm (0.75 oz): A medium thickness that balances flexibility and performance, commonly used in mobile devices and wearable technology.
- 35μm (1 oz): A thicker copper layer, usually used in high-current applications or where additional mechanical strength is required.
In some specific applications, copper foil is sometimes thicker, even up to 70μm
3. Thickness of Coverlay or Protective Layer
Coverlayer are used to protect circuits from the outside environment, such as moisture and physical damage.
- Typical coverlay can range in thickness between 12.5μm and 50μm
Thicker coverlays provide greater protection and are more durable, but increase overall thickness and may reduce flexibility.
In many designs, there is a balance between protection and flexibility. Highly flexible applications such as wearables may choose a thinner coverlay material to maintain the required flexibility, while industrial applications may prioritize thicker coverlays for enhanced durability.
4. Thickness of adhesive layer
The adhesive layer is used to bond the base material to the copper foil, and the cover film to the circuit layer. Common adhesive thicknesses range between 20μm and 50μm. Some special flex PCBs may also use adhesive-free technology, which can reduce thickness.
The thickness of the adhesive layer can affect both the mechanical flexibility of the FPCB and its heat dissipation characteristics. Thin adhesive layers preserve flexibility, while thicker layers may offer greater bonding strength but reduce flexibility.
5. Solder mask
If there is a solder mask on the flex PCB, although its thickness is very thin (usually 10μm to 15μm), it will still have a certain impact on the overall thickness.
6. Number of layers
In addition, the number of layers of FPCB will also affect the thickness. Multi-layer design can make the circuit density higher and the signal isolation better, but the thickness will also increase. So when designing, you have to choose the number of layers according to specific needs.
Practical applications of flexible circuit boards
1. Mobile Devices:
Flex circuit boards are widely used in mobile devices such as smartphones, tablets, and wearables. They can be used to connect various components and modules, such as displays, touch screens, cameras, batteries, and sensors.
2. Automotive Electronics:
Flexible circuit boards play an important role in automotive electronic systems, such as connecting in-vehicle entertainment systems, navigation systems, instrument panels, body control modules, and safety systems.
3. Medical Equipment:
Because flexible circuit boards can be bent and adapt to specific shapes, they have a wide range of applications in medical devices. For example, flexible circuit boards are used in medical sensors, monitoring devices, and medical imaging devices.
4. Industrial Control and Automation:
Flexible circuit boards are used in industrial control and automation to connect sensors, actuators, control modules, and data acquisition devices.
5. Aerospace field:
Due to their thin, light, and flexible nature, Flexible PCB printing are widely used in the aerospace field in avionics, navigation systems, communication equipment, and spacecraft internal connections.
6.LED Lighting:
Flexible circuit boards are used in LED lighting products such as flexible LED strips, flexible displays, and luminaires.
7. Other fields: flexible circuit boards are also used in consumer electronics, audio equipment, home appliances, power electronics, communication equipment, and other fields to provide connection and signal transmission functions.
Flexible circuit boards are used in a wide range of applications to meet the needs of many electronic devices with special shapes and design requirements while also enabling thinner, more flexible, and more reliable designs. With the continuous development of technology, the application field of flexible circuit boards will continue to expand.
Group Profile
Zhuhe is a high-tech industrial group integrating R & D, production, and sales. It is mainly committed to the R & D and manufacturing of various PCBAs (printed circuit board components, including flexible board FPC and soft and hard board components, which are the core components in electronic products).
The company is positioned as a mid-to-high-end FPC and FPCA production and service provider and can provide high-quality services such as FPC and FPCA processing and production, layout board design, component procurement, processing, and manufacturing of complex packaging devices such as BGA, CSP, and POP for customers in the industry. The company has invested 150 million yuan to build a one-stop FPC and FPCA production line and currently has automatic production lines such as an automatic imported exposure machine and an imported vacuum two-fluid DES, combined with Industry 4.0, and is committed to creating high-quality and high-end products for customers.
We provide customers with one-stop service!
We are the source manufacturer with 10 years of focus on manufacturing high-quality circuit boards and providing efficient and satisfactory services.
We have a professional team; we have rich R&D and production experience in FPC, PCBA, IC, new energy, and other fields.
We have considerate service-we provide considerate service from sample design to mass production.
We have sophisticated, intelligent manufacturing; we have highly intelligent equipment; and we have efficient teamwork to provide you with the best cost solution.
Q: What is the difference between flexible circuit board and rigid circuit board?
A: The biggest difference between flexible circuit board and rigid circuit board is its flexibility. The flexible circuit board uses flexible substrate materials, which can realize operations such as folding, bending, and bending, and can be used in occasions where ordinary PCBs are difficult to use, such as bendable screens, bendable LEDs, etc. On the other hand, the base material of rigid circuit boards is rigid glass fiber or polyester, and the board surface is rigid.
Q: What are the fields in which Flexible PCB printing are used?
A: Flexible circuit boards are widely used, mainly including: (1) mobile intelligent terminals, (2) digital cameras, (3) LCD liquid crystals, (4) automotive electronics, (5) medical electronics, (6) civil aerospace.
Q: What are the advantages of flexible circuit boards?
A: (1) It has flexibility, which can achieve special plasticity such as bending, folding, and bending;
(2) The product is light and thin, and the thickness can be extremely thin;
(3) High reliability, high performance, high-density wiring;
(4) Environmentally friendly and energy-saving, more material-saving than traditional PCB boards;
(5) It is suitable for small size, narrow pitch and high density circuit applications.
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