In SMT factories, static electricity is a form of electrical energy that remains on the surface of an object and is the result of the loss of balance of positive and negative charges in a local area, through the conversion of electrons or ions.Normally, objects are non-electrical to each other, and when two objects rub against each other, some of the electrons in one object are transferred to another object, and the object loses electrons and becomes "positively charged," while the other object gains electrons with a "negative charge."Electric charge cannot be created, nor can it be lost, it can only be transferred from one object to another.Static electricity is the general term for the electric phenomena produced by the generation and disappearance of electric charge.
As mentioned above, usually objects have equal positive and negative charges, so they are not electrically obvious to others. However, if two objects of different materials come into contact or electrostatic induction causes the transfer of charges, then electrical properties are created.
2. The way in which static electricity is generated
There are many ways to generate static electricity, such as contact and friction between two objects, electrolysis, temperature difference, and so on.There are two main forms
Kind: friction produces static electricity and induction produces static electricity.
In daily production and life, people often feel the phenomenon of friction electrification.Friction electrification is usually divided into two processes: discharge contact with an electron transfer process.When two objects come into contact, a "double electric layer" is formed at the interface.The process of friction and separation of electricity.When two objects come into contact and quickly separate, some of the transferred electrons have no time to return to the object where they came from, which makes one object negatively charged due to excess electrons, and another positively charged due to lack of electrons.
In fact, as long as two different objects come into contact and separate, static electricity is generated, and the heat generated by friction provides energy for electron transfer, which greatly enhances the electrostatic effect.Friction produces static electricity mainly between insulators.
When a conductor is near a charged body, a different charge is induced on the surface of the charged body, while a similar charge is induced on the surface of the charged body.
The above electrostatic knowledge summarized in SMT processing factory, please pay attention to the partner who works in the electronics factory.
Please pay attention to the small details of electrostatic
Do the management work of electrostatic protection, using various control methods, in any area of the electronics factory may generate static voltage, some awareness to do well.
(1) all components are treated as electrostatic sensitive components;
(2) never contact sensitive components or components without good grounding;
(3) if the IC is not on the anti-static work table, keep them in the ground shielded container;
(4) the circuit board with IC must be treated on the anti-static work table;
(5) wrist bands and shoe covers should be tested every day to ensure that they meet the requirements of anti-static;
(6) all instruments and equipment shall be grounded;
(7) the gas and liquid flowing through IC should be kept at low speed;
(8) in the absence of other electrostatic protection measures, do not take the IC installed in the anti-static tube;
(9) use fixed-point ion air sterilizer in the process that may generate static electricity;
(10) the wristband should maintain the potential of human body and ground;
(11)ESD protection table should maintain electronic components and equal potential;
(12) do not place any electrostatic insulation inside the anti-static safety zone.
Jingbang to manage SMT processing materials provided by customers
Jing state SMT processing factory in order to standardize the procedures of customers with the use of materials, to ensure that the material storage security and control of the company's production costs, improve the company's economic benefit, to promote the development of the company's production, jing state has been underway for ERP order management system, strictly treat each progress and material usage, ensure that customer orders, feedback and management system of the company.The following are the principles of material management in SMT processing plant.
(1) first-in, first-out: the materials that are put into storage shall be put out and used first
(2) timely and appropriate: master the timeliness and quantity of each link of the warehouse.
(3) consistency of accounts: it is required that the daily record of bills should be consistent with the actual items.
(4) daily inventory: the warehouse staff shall count the materials they are responsible for every day, so as to keep the same account items every day.
(5) e-management: realize the systematization and paperless management.