What are the environmental requirements for SMT chip processing

What are the environmental requirements of SMT chip processing workshop? Let's take a look:

SMT production equipment is a high-precision mechatronics equipment. Equipment and process raw materials have certain requirements for environmental cleanliness, humidity and temperature. In order to ensure the normal operation of equipment, reduce the damage of surrounding environment to components and improve quality, the environment of SMT workshop has the following requirements:

1. Power supply for SMT chip processing

Generally, single-phase AC220 (220 ± 10%, 0 / 60Hz) and three-phase AC380 (380 ± 10%, 50 / 60Hz) are required. The power of the power supply should be more than twice the power consumption.

2. Air source for SMT patch processing

The pressure of the air source shall be configured according to the requirements of the equipment. The air source of the factory can be used, and the oil-free compressed air machine can be configured separately. Generally, the pressure is greater than 7kg / cm2. Clean and dry purified air is required, so it is necessary to remove oil, dust and water from the compressed air. Use stainless steel or pressure resistant plastic pipe as air pipe.

3. Exhaust of SMT patch processing

Reflow and wave soldering equipment shall be equipped with exhaust fan. For full hot blast stoves, the minimum flow value of the exhaust duct is 500 cubic feet per minute (14.15m3 / min)

4. Temperature and humidity of SMT patch processing

The ambient temperature of the production workshop is 23 ± 3 ℃, generally 17 ~ 28 ℃, and the relative humidity is 45% ~ 70% RH. Appropriate thermohygrometers shall be set according to the size of the workshop, regular monitoring shall be done, and facilities for adjusting temperature and humidity shall be configured.

5. Anti static of SMT patch processing

Workers need to wear anti-static clothes, shoes and anti-static bracelets before entering the workshop. The anti-static work area shall be equipped with anti-static floor, anti-static seat cushion, anti-static packaging bag, turnover box, PCB rack, etc.

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