The method of control FPC material shrinkage

The method of control FPC material shrinkage

FPC (Flexible Print Circuit) refers to a soft circuit board, also known as flexible printing circuit board, deflection line board or soft board. This circuit board has the advantages of high wiring density, light weight, and thin thickness. It is widely used in many products such as mobile phones, laptops, PDA, digital camera, and LCM. In recent years, the PCB manufacturing process has developed rapidly, and the industry has put forward higher requirements for FPC. Precision Pitch is the main breakthrough direction of FPC in the future. The stability and exquisite size of the size have also triggered the rise in the cost of FPC. How to control the contradictions of the two, and the contraction control of FPC materials during the production process has become the main breakthrough. Let's make a brief explanation on how to control and control.

Control method of FPC material shrinkage

1. Design

1. In terms of line: Because the FPC will expand due to temperature and pressure during ACF pressure, the expansion rate of the finger must be considered when the initial design line is designed.

2. In terms of typesetting: The design products are as symmetrical as possible in the entire typesetting as possible. The minimum interval between each two PCS products is maintained by more than 2mm. The copper -free part and the excessive interval part are staggered. These two parts are two important aspects of the influence of material contraction in the subsequent manufacturing process.

3. In terms of material selection: The glue covering the film must not be thinner than the thickness of the copper foil, so as to avoid insufficient glue filling during pressure blending, resulting in deformation of the product.

4. In terms of process design: The coverage membrane is covered with all copper foil as possible. It is not recommended to stickers cover the film to avoid uneven pressure during pressing. PI -reinforcement fitting of PI or more should not be too large.

2. Materials storage

I believe that the importance of material storage does not need to say more. I need to store strictly according to the conditions provided by the material supplier.

Third, manufacturing

1. Drilling: It is best to bake before drilling to reduce the increase in the substrate of the substrate during subsequent processing due to the high content of the water in the base material.

2. Electroplating: It should be made by short -sized splints, which can reduce the hydration generated by swinging caused by deformation. When plating, swing can reduce the amplitude of the swing as much as possible. The amount of plywood also has a certain relationship. The number of asymmetric splints can be used to help with other sidelines. When plating, the under -groove can avoid the impact of sudden high current on the plate.

3. Pressure: The traditional pressing machine is reduced compared to the fast compressor. The traditional pressure machine is constant temperature solidification, and the quick -compressor is thermal solidification. Therefore, the changes in the traditional pressure machine control glue must stabilize this. Of course, the layer of the layer of pressure is also a very important part.

4. Baking: For fast -pressed products, baking is a very important part. The conditions for baking must be completely solidified, otherwise it will be infinite after subsequent production or use. The baking temperature curve is generally gradually heating up to the temperature of the glue completely melting, and then this temperature is continuously solidified to the glue, and then gradually cooling and cooling.

5. During the production process, try to maintain the stability of the temperature and humidity in all stations. The transfer between the stations of each station, especially those who need to be produced, must be attached to the conditions of the product.

Fourth, packaging

Of course, the completion of the product is not to say that everything is good. It is necessary to ensure that the customer does not have any problems in the subsequent use. In terms of packaging, it is best to bake first, dry the water absorbed by the product in the manufacturing process, and then use a vacuum packaging to guide the customer how to save it.

Therefore, to ensure that the quality of such products is stable, it is necessary to save from the material → each process control → packaging → customers must be executed in strict accordance with specific requirements before use.

5. End language

In the next few years, smaller, more complicated and assembly cost -effective flexible circuits will require new methods to assemble and increase hybrid flexible circuits. The challenge to the flexible circuit industry is to use its technical advantages to maintain a synchronization with computers, remote communication, consumer demand, and active market. Century Core's PCB production and processing service department has a group of high-level technical backbones and front-line operators, which provides reliable guarantees for ensuring product quality (based on IPC-A-610CCLASS Ⅱ and corporate standards).