In many electronic manufacturing facilities, anti-static products are widely used, yet electrostatic damage still occurs frequently. This article explores common anti-static practices in factories and highlights some key mistakes that can lead to ineffective static control.
One of the most common errors is the lack of anti-static testing equipment. Many companies purchase a lot of anti-static tools but neglect to invest in basic testing instruments. Without these tools, it's impossible to verify whether the products are functioning properly or have degraded over time. This oversight can significantly reduce the effectiveness of the entire anti-static system.
Another major issue is poor grounding. A reliable and independent grounding system is essential for any anti-static setup. The grounding resistance should be less than 10 ohms, and the installation must comply with standards like GBJ97. It's also crucial not to connect the anti-static ground wire to the power supply’s neutral line or lightning protection system, as this can create dangerous electrical loops. In three-phase five-wire systems, the ground wire can serve as an anti-static ground, but the neutral and ground wires must never be mixed.
The thickness of the grounding wires also matters. The main grounding line should be at least 100mm², while branch lines should be no less than 6mm². Equipment and workbench grounding should use multi-strand plastic conductors with a minimum cross-section of 1.25mm², and they should be yellow-green in color for easy identification. All connections must be secure and allow for easy assembly and disassembly, using reliable connectors like clip-on terminals.
Many companies make the mistake of treating anti-static products as regular items. For example, anti-static wristbands may appear intact after months of use, but internal damage could render them ineffective. Regular testing is essential to ensure their continued functionality.
Footwear and socks play a critical role in static control. Even if workers wear anti-static shoes, improper socks or insoles can interfere with grounding. In summer, it's better to wear anti-static slippers instead of regular shoes, and in winter, cotton socks are preferable to nylon ones. To detect unqualified footwear, many facilities use a human body resistance tester at entry points.
Some workers only wear anti-static shoes but neglect to use anti-static clothing. This is a mistake because synthetic fabrics can generate significant static electricity. Wearing anti-static overalls helps reduce this risk.
On the flip side, wearing only anti-static clothing without proper footwear is equally ineffective. Studies show that without good grounding through shoes, even anti-static clothes cannot prevent static buildup.
Another common mistake is using anti-static clothing and shoes without an anti-static floor or wrist strap. These components are essential for safely dissipating static from the body. Ideally, all qualified facilities should have both anti-static flooring and wrist straps. At a minimum, wrist straps are necessary for effective static control.
Finally, incorrect usage of wristbands is another problem. Wristbands can become loose or damaged over time, leading to poor conductivity. Daily checks are important, and using a wristband monitoring system ensures continuous performance. Unfortunately, many companies don’t even have a wristband tester, leaving workers unprotected.
By addressing these issues, factories can significantly improve their anti-static measures and reduce the risk of electrostatic damage.
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