EPA equipment and precautions
1. Static safety workbench: It is composed of workbench, anti-static table mat, wrist strap connector and grounding wire.
2. There should be more than two wrist strap joints on the anti-static table mat, one for operators and one for technicians and inspectors.
3. It is not allowed to stack plastic boxes, rubber, cardboard, glass and other debris that are prone to static electricity on the electrostatic safety workbench. The drawings and materials should be placed in an anti-static document bag.
4. Anti-static wrist strap: People who directly touch electrostatic sensitive devices must wear an anti-static wrist strap. The wrist strap should be in good contact with the human skin, and the resistance of the wrist strap system to the ground should be 1MΩ.
5. Anti-static containers: The component holding bags, turnover boxes, PCB loading and unloading racks in the production site should be equipped with electrostatic protection. Metal and ordinary containers are not allowed, and all containers must be grounded.
6. Anti-static work clothes: People who enter the static work area and those who come into contact with SMD components must wear anti-static work clothes, especially in dry environments where the relative humidity is less than 50% (such as winter). Work clothes fabrics should meet the relevant national standards.
7. Personnel entering the work area must wear anti-static work shoes. Persons wearing ordinary shoes should use conductive shoe harnesses, anti-static shoe covers or heel straps.
8. The conveyor belt and drive shaft used in the production line should be equipped with anti-static grounding brushes and poles.
9. Ion wind static eliminator can be used on the surface of the conveyor belt.
10. The assembly jigs, testing jigs, welding tools, various instruments, etc. used in the production site should be equipped with good grounding wires.
11. An anti-static test bench should be installed at the entrance of the production site. Everyone who enters the production site should undergo an anti-static test. Only after passing the test can they enter the site.
For static control, please refer to the following information:
(1) Control the static electricity generation environment:
a. Humidity control. Increase the humidity as much as possible without causing corrosion, rust, or other hazards to equipment or products;
b. Temperature control. Try to reduce the temperature when possible, including ambient temperature and object contact temperature;
c. Dust control. This is an important measure to prevent adhesion (adsorption) charging;
d. Floors, table and chair fabrics and workbench pads should be made of anti-static materials and properly grounded;
e. Electrostatic protection measures should be taken for the transportation, storage, packaging and unpacking of electrostatic sensitive products;
f. The speed of spraying, flowing, conveying, winding and separating should be controlled, and a moderator should be used in the conveying pipeline of liquid, powder and other materials.
(2) Prevent the human body from being charged:
a. Wear an anti-static wrist strap;
b. Wear anti-static clothing, clothes and hats;
c. Wear anti-static footwear and anklet;
d. Wear anti-static gloves and finger cots;
e. Strictly prohibit human activities that are not related to work (such as doing exercises, playing around, combing hair, eating, etc.);
f. Perform ion wind bath.
(3) Process control measures:
a. Develop and implement anti-static operating procedures;
b. Use anti-static turnover, transport trays, boxes, boxes and other containers and trolleys;
c. Use anti-static tools (soldering iron, tin suction device, etc.);
d. Use anti-static packaging;
e. Set the necessary standing time for liquid materials with the possibility of electrostatic combustion and explosion;
f. Minimize the contact pressure, time and area between objects (such as the transportation of cloth, paper, wire, film material, tape, etc., between transfer rollers, reels, spools and products) and limit the running speed not to be too fast.
Anti-static operation specifications at the production site:
1. The operation of all components must be carried out on the electrostatic safety workbench, and all components that enter the anti-static work area must be treated in accordance with the anti-static requirements.
2. SMD devices without anti-static packaging shall not enter the production site.
3. When removing parts from the static protection container, it should be carried out on the static safety workbench. As a worker, the following three points must be observed:
(1), must wear anti-static overalls.
(2) Wear an anti-static wrist strap, which has good contact with the skin and is reliably grounded.
(3) When touching precious SMD components, you must wear an anti-static ring or finger cot.
4. For components without anti-static packaging, they should be eliminated before entering the static work site.
5. A monitor should be equipped on important operating stations to detect whether the wristband is in a normal state at any time.
6. Ordinary clothing, drawings, documents, etc. shall not be in contact with components.
7. When holding sensitive devices in your hand, avoid touching their leads and lugs.
8. When some components need to be cleaned, plastic brushes cannot be used, and anti-static brushes must be used for cleaning.
9. All tools, fixtures, equipment and instruments that do not have anti-static function that must be used at the operation site should be placed on the anti-static table (table) pad.
10. It is forbidden to reuse device packaging tubes to package components.
11. When welding by hand, use an anti-static low-voltage soldering iron.
12. A low-voltage DC electric screwdriver with a grounding wire and other assembly equipment should be used.
13. Outsiders who enter the site without anti-static measures are not allowed to touch the components.
14. Various equipment at the production site must take anti-static measures