In many factories, we have adopted a lot of anti-static products, why is the electrostatic damage often happen? The following article tells the story of factory anti-static method of common mistakes.
1.No antistatic products testing instrument
The most common mistake is to many companies purchasing a lot of anti-static products, but there is no purchasing some commonly used anti-static product testing instrument. We know that each product has a certain life, quality is good or bad, if not a few commonly used testing instruments, we don't know whether the product is damaged, the quality is good. This is not anti-static effect.
2.Ground connection is bad
a、Esd system must have an independent and reliable grounding device, grounding resistance should be less than 10 Ω commonly, embedding and detection method should be accord with the requirement of GBJ 97.
b、Anti-static ground shall not take on the power of zero line, may not be Shared with lightning protection ground. Because the phenomenon such as lightning will affect the performance of the product through the loop and personal safety.
c、Five wire system using three-phase power supply, the geodesic line can be used as antistatic ground (but zero line and ground shall not be mixed by)。
d、Grounding trunk cross-sectional area should not be less than 100 was; Trunk cross-sectional area should not be less than 6 was; Equipment and the workbench grounding line should adopt cross-sectional area not less than 1.25 was put multi-strand plastic wire, ground wire color with green and yellow line advisable.
e、Grounding the trunk connections should use brazing.
f、Anti-static equipment terminals shall ensure reliable contact, drag, allows the use of various type connector, such as E tong, connector, etc.
g、Docking ground resistance demanding workplace should be installed in the grounding system monitoring and alarming device.
3.The antistatic products used as common products
Many companies use anti-static product as normal product use, think product not deformation, not burst can continue to use, actually this is a misunderstanding. Such as anti-static wrist band generally used only a few months, when using a period of time after the appearance of it may not damage, but the test often found the wrist band have gone bad.
4.Do not take the socks and the insole
Usually people wear anti-static shoes will wear socks or pad insoles, foot easy to sweat, these socks and the insole will therefore conducting electrostatic, but some of the foot is not easy to sweat if don't wear some anti-static 祙 and mat insole, the socks and the insole is not conducting electrostatic, so that the human body electrostatic also cannot on shoes into the earth. Therefore placed at the entrance of the room or building "human comprehensive resistance detector", rapid and accurate human body comprehensive test instrument which can detect those wearing unqualified anti-static shoes, socks and cushion insole. Suggest that workers wear anti-static slippers in the summer don't wear 祙 child at the same time, in the winter can wear cotton socks but don't wear nylon stockings.
5.Only wear anti-static shoes do not wear anti-static clothing
Besides wear anti-static shoes also wear anti-static overalls to better control the human body static electricity. Because clothing can also take high electrostatic, especially now that most of the garments are chemical fiber, can produce thousands of tens of thousands of volts electrostatic.
6、Only wear antistatic clothing don't wear anti-static shoes
Experiments have shown that people are only wear anti-static work clothes if you don't wear anti-static shoes and not a very good anti-static floor, antistatic effect is poor.
7.Anti-static clothing and shoes wear but no anti-static floor and don't wear anti-static wrist band
We know that the human body electrostatic guide will go is generally through the anti-static shoes imported anti-static floor, or through a wrist band into the earth, if the anti-static floor and anti-static wrist band all have no, the man's static electricity it is not easy to walk. Conditional company best anti-static floor and anti-static wrist band should have, no condition of the company at least also should have anti-static wrist band.
8、Is not the correct use of the wrist band
Wrist band due to the relatively easy to damage, so want to test every day, all right wrist band as workers wear too loose and does not conduct electricity, so the best way is to use the wrist with online monitor monitoring at any time. But there are a lot of company doesn't even have a wrist band tester, a wrist band with more than a year to see broken just don't have to, this is not the effect of electrostatic discharge.
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