What measures need to be done to prevent static electricity in the clean room?
In the clean room, the protection and control of static electricity is not only a problem of matching anti-static products, but a systematic work involving the manufacture, assembly, processing, inspection, testing, maintenance and packaging of sensitive electronic products. , transportation, storage, use and other aspects, and is a series mode, any mistakes in the link will lead to the failure of the entire clean room for purification protection work. It needs to establish a complete protection system including design, operation, inspection, internal audit and training under strict standard specifications, and the work may involve relevant departments.
First, define the range of static sensitive areas; the company's static control procedures must be followed and implemented in this area. This includes the possibility of carrying non-essential static electricity generating substances to this area such as general plastic products, polystyrene foam.
A better way to reduce the amount of static electricity generated in a clean room is to minimize the amount of insulating material that is not necessary in the work area. (The insulating material cannot be electrically conductive. It is itself a source of high static electricity and is electrostatically charged and is prone to electrostatic fields.)
In order to prevent the generation of static electricity and electrostatic fields, clean workshops must take appropriate protective measures, such as conductive flooring, conductive wax, etc.; clean room personnel must wear static shoes with static dissipative material soles, wear anti-static clothing. In particular, the plastic material on the metal tool is not allowed in the static protection zone. Soldering irons, soldering tins, test equipment, etc. must be designed with special safety and anti-static design; and equipment that has not been approved can be carried into the protection zone.
The common misconception is that high humidity can solve the static problem, so it is not correct to consider other methods of reducing static electricity. High humidity can reduce the static electricity generated in the clean room to the human body, but it is still enough to damage sensitive components. The correct concept is that high humidity can suppress the amount of static electricity generated, while low humidity is the opposite.
Always pay attention to the electrostatic safety protection area markings in your working environment. If you enter these areas, follow the company's ESD precautions, including isolating all persons or static objects that may generate static electricity from the protective area of the clean room.
Also, check that all sensitive components in the ESD-protected area are properly and clearly marked with an ESD. However, components that are not labeled are not considered to be electrostatically safe.
While it is possible to determine which devices are electrostatically sensitive, it is a good work practice to treat all electronic components and assembly actions as static sensitive. Maintaining the rigorous clean room ESD protection for all the components you handle and treating it as a routine habitual job will be easier to handle differently depending on the nature of the individual components.