Publish Time: 2021-06-29 Origin: www.smtfactory.com
With the development of science and technology, the electrostatic phenomenon has been widely and effectively applied in the fields of electrostatic spraying, electrostatic spinning, electrostatic sorting, electrostatic imaging and so on. The electrostatic voltage generated in the manufacturing of a Full-auto SMT Production Line far exceeds the breakdown voltage of MOS devices, which will often cause hard or soft breakdown of the device, making it invalid or seriously affecting the reliability of the product. Next, let's talk in detail about how to prevent static electricity during the operation of the Full-auto SMT Production Line?
This is the content list:
What is the principle of electrostatic protection during the Full-auto SMT Production Line process?
What are the electrostatic protection methods during the Full-auto SMT Production Line process?
What is the static protection equipment during the Full-auto SMT Production Line?
What are the anti-static precautions in the manufacturing of the Full-auto SMT Production Line?
In the manufacturing process of Full-auto SMT Production Line, it is impossible not to generate static electricity. Full-auto SMT Production Line generates static electricity is not a hazard. The hazard lies in the accumulation of static electricity and the resulting electrostatic discharge. The core of static electricity protection is "quiet elimination", and the accumulation of static electricity must be prevented where static electricity may occur.
Use anti-static materials: Metal is a conductor, and the leakage current of the conductor is large, which will damage the device. In addition, since insulating materials are prone to frictional electrification, the Full-auto SMT Production Line cannot use metal and insulating materials as anti-static materials.
Leakage and grounding: ground the parts that may or have generated static electricity, and provide static discharge channels.
Elimination of the static electricity of the conductor: the static electricity on the conductor can be grounded to make the static electricity leak to the ground. Therefore, a 1MΩ current-limiting resistor is usually used in the electrostatic protection system of Full-auto SMT Production Line to limit the discharge current to less than 5mA.
Elimination of static electricity with non-conductor: For the static electricity on the insulator, since the charge cannot flow on the insulator, the Full-auto SMT Production Line cannot be grounded to eliminate the static electricity. Use a shielding cover and effectively ground the shielding cover.
Process control method: In order to generate as little static electricity as possible in the manufacture of electronic products, control the accumulation of static charge, quickly eliminate the existing static accumulation, and release it immediately. The PCB design of the plant, equipment installation, and Full-auto SMT Production Effective measures are taken in the operation and management system of Line.
①The human body anti-static system includes anti-static wrist straps, work clothes, hats, gloves, shoes, socks, etc.
②Anti-static floor includes anti-static terrazzo floor, anti-static rubber floor, PVC anti-static plastic floor, anti-static carpet, anti-static raised floor, etc.
③Anti-static operation series: including anti-static: I: table mat, anti-static packaging bag, anti-static logistics trolley, anti-static soldering iron and tools, etc.
Full-auto SMT Production Line equipment must be well grounded, and the placement machine should adopt a three-phase wireless grounding method and be grounded independently. The ground, work surface mats, and chairs of the production site should meet the requirements of anti-static. Maintain a constant temperature and humidity environment in the workshop. It should be equipped with anti-static material boxes, turnover boxes, PCB racks, logistics carts, anti-static packaging belts, anti-static wrist straps, anti-static soldering irons and tools.
①Formulate an anti-static management system, and have a dedicated person responsible.
②Spare anti-static overalls, shoes, bracelets and other personal items for use by outsiders.
③Regularly maintain and check the effectiveness of the anti-static facilities of the Full-auto SMT Production Line.
④The wristband is checked once a week (or every day).
⑤The grounding of table mats and floor mats, and the performance of static eliminators are checked once a month.
⑥Anti-static component racks, printed board racks, turnover boxes; anti-static performance of transport vehicles, table mats, and floor mats are inspected every six months.