How to solder the flexible PCB board?

1. Before soldering, apply flux to the pad and treat it with a soldering iron to avoid poor tin plating or oxidation of the pad, resulting in poor soldering. Generally, the chip does not need to be processed.

2. Use tweezers to carefully place the PQFP chip on the PCB board, taking care not to damage the pins. Make it aligned with the pad and ensure that the chip is placed in the correct direction. Adjust the temperature of the soldering iron to more than 300 degrees Celsius, dip a small amount of solder on the tip of the soldering iron, press down the aligned chip with a tool, and add a small amount of solder to the two diagonal pins. Hold down the chip and solder the pins on the two diagonal positions to make the chip fixed and unable to move. After soldering the opposite corners, recheck the alignment of the chip position. If necessary, adjust or remove and realign the position on the PCB board.

3. When starting to solder all the pins, add solder to the tip of the soldering iron, and apply flux to all the pins to keep the pins moist. Touch the end of each pin of the chip with the tip of a soldering iron until you see the solder flowing into the pin. When soldering, keep the tip of the soldering iron parallel to the soldered pin to prevent overlap due to excessive soldering.

4. After soldering all the pins, wet all the pins with flux to clean the solder. Suck off the excess solder where needed to eliminate any short circuits and overlaps. Finally, use tweezers to check whether there is any false soldering. After the inspection is completed, remove the solder from the circuit board, and soak the hard brush with alcohol and wipe it carefully along the pin direction until the solder disappears.

5. SMD resistance-capacitance components are relatively easy to solder. You can put tin on a solder joint first, then put one end of the component, clamp the component with tweezers, and then see if it is placed correctly after soldering one end; If it has been aligned, then solder the other end.

What is the difference between flexible PCB board, rigid PCB board and rigid-flex PCB board?

Flexible PCB boards play an important role in the lead-free operation, but they are currently costly, but they are slowly reducing costs. Generally speaking, flexible PCB boards are indeed more expensive and costly than rigid PCB boards. When manufacturing flexible PCB boards, in many cases have to face the fact that many parameters are outside the tolerance range. The difficulty in manufacturing flexible PCB board lies in the flexibility of the materials.

The rigid-flex board has the characteristics of FPC board and rigid PCB board at the same time. Therefore, it can be used in some products with special requirements. It has both a certain flexible area and a certain rigid area, which can save the internal space of the product. It is a great help for reducing the volume of the finished product and improving the performance of the product. It is commonly used in mobile phones.

However, there are many production processes for the rigid-flex PCB board, the production is difficult, the yield rate is low, and more materials and manpower are used. Therefore, its price is relatively expensive and the production cycle is relatively long.

The production process of flexible PCB boards

Prodution process of double sided flexible PCB boards:

Cutting → Drilling → PTH → Electroplating → Pre-processing → Dry Film Pasting → Alignment → Exposure → Development → Graphic Plating → Stripping → Pre-processing → Dry Film Application → Alignment Exposure → Development → Etching → Stripping → Surface Treatment → Paste the cover film → Press → Curing → Immersion nickel gold → Printing characters → Cutting → Electrical test → Punching → Final inspection → Packaging → Shipment.

Prodution process of single sided flexible PCB boards:

Cutting → Drilling → Pasting Dry Film → Aligning → Exposure → Developing → Etching → Stripping → Surface Treatment → Covering Film → Pressing → Curing → Surface Treatment → Immersion Nickel Gold → Printing Characters → Cutting → Electrical Measurement → Punching Cutting → final inspection → Packaging → Shipment.

Application of FPC flexible circuit board

FPC flexible circuit boards account for a large proportion of applications in smart phones, which can meet the needs of mobile phone screens, batteries, and camera modules. In the 5G era, the emergence of multifunctional smart phone modules, radio frequency modules, folding screens, and miniaturized models are inseparable from the connection of FPC flexible circuit boards. Therefore, in the development of smart phones, the amount of FPC flexible circuit boards is also constantly improving.

With the development trend of miniaturization of smart terminals, FPC flexible circuit boards are light and flexible, making them more and more important during manufacturing of smart wearable devices. As one of the main materials of smart wearable devices, FPC flexible circuit boards have a broad market development space. It is expected to continue to rise in the future and become a beneficiary of the development of smart wearable devices.

In addition to consumer electronic products, the application of FPC flexible circuit boards also covers many fields such as automobiles, medical treatment, and industrial control, and the application prospects are very broad.

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