The circuit board dispensing machine is used for dispensing the circuit board, which is mainly used for waterproofing, dustproof and anticorrosion. Nowadays, many enterprises have put forward higher requirements for the usability and stability of electronic products, and dispensing processing of circuit boards has become an indispensable process. Long-term and effective protection of some sensitive circuit boards and some electronic components of electronic equipment is undoubtedly a manifestation of the increasingly important role played by today’s sophisticated and demanding electronic equipment applications. The waterproof glue used in the dispensing process of circuit boards has stable dielectric insulation, which is an effective measure to prevent environmental pollution, and at the same time, it can offset the stress caused by impact and vibration in a certain temperature and humidity range. The glue used in circuit board dispensing processing is based on condensation system and addition curing system, which does not need secondary curing, and can meet the special requirements of bonding, heat conduction, flame retardant, high transparency, etc. After curing, it becomes a flexible elastomer. The curing speed is uniform, which has nothing to do with the thickness of the circuit board during dispensing and the tightness of the environment.
Benefits and characteristics of dispensing circuit board;
1. After the circuit board dispensing process is completed, the product is moisture-proof, waterproof and weather-resistant, and can be used for a long time.
2, does not corrode metal, and is suitable for encapsulating circuit board modules.
3. The colloid is flexible, and it has good resistance to shock and deformation.
4. High insulation, and the encapsulated product works stably.
5. Good fluidity, fast self-leveling, and high potting production efficiency
6. It is detachable, and a certain component of the sealed circuit board can be taken out for repair and replacement, and then repaired with waterproof glue without leaving any trace.
Operation process of dispensing circuit board:
1. Clean the PCB: Clean the PCB with absolute alcohol and a stiff brush, especially the rosin residue and solder residue at the solder joints.
2. Drying the circuit board: Dry the circuit board with a dryer or a hot air cylinder. After drying, carefully check it again for obvious virtual soldering, short-circuit solder joints, and residual solder slag.
3. waterproof glue: Brush the circuit board with a brush by waterproof glue, or immerse the circuit board in waterproof glue (first treat and then solder the wires, or treat them after the wires are connected).
4. Wait for the waterproof glue to solidify. It takes more than 12 hours to dry naturally before the next process can be carried out. Of course, manual assisted drying can also be used to speed up the solidification progress.
5. Test the function of the circuit board. If it is abnormal, it will be repaired, and then the circuit board dispensing processing of waterproof glue will be started from step 3. If it is normal, it will go to the next step.
6. Fill the whole circuit board to the shell with epoxy resin/silica gel/glue stick, etc., and fix and seal the wiring. Be careful not to have dead corners, and the glue should be as flat and beautiful as possible.
7. It takes more than 24 hours for waterproof glue to dry. After completion, according to the actual situation, make random inspection or complete inspection of the circuit board to confirm whether the function is normal.
