Antistatic tape is currently used in the SMT material processing technology. With the rapid development of electronic component manufacturing technology, especially the miniaturization of components and the integration of integrated circuits, CMOS devices using 0.15-0.25mm manufacturing processes are widely used. use. Its breakdown voltage is usually between 50V and 100V, and it has a higher integration of ultra-high-speed, high-frequency IC devices, which is more sensitive to static electricity. Some VMOS devices have a withstand voltage of only 30V, which imposes stricter ESD protection requirements for the manufacturing process of the above-mentioned electrostatic sensitive device products.
In the manufacturing process of electronic products, electrostatic discharge can change the characteristics of semiconductor devices, causing damage or unstable performance, resulting in damage to the final product or improper use. Experts have done statistics, the average product loss due to static electricity is about 8-33%. The danger of anti-static is so great, how to protect electronic products in the production process? Experts believe that the following aspects must be done:
1. Ground anti-static;
2. Anti-static connection of the station;
3. The grounding resistance is less than 4 ohms;
4, temperature and humidity control: 20-30 ° C, relative humidity 30-70%;
5, ionizer, positive and negative ion wind;
6, the body's static protection;
7, the package uses anti-static bags, anti-static boxes, anti-static boxes and so on.
Through years of observation and research on the details of electronic product manufacturing, our company has in-depth understanding that many details of static protection have to be done better in the SMT production process. For example, the cover tape of the SMT tape (CoverTaper) does not reach the ideal antistatic impedance (105~8ohms), the SMT film is not anti-static, the cotton fiber package is not anti-static, and the steel mesh wiper bag is not protected. Static electricity, etc.... These details are not easy to attract attention. In the production process, the phenomenon of contact with components can be seen everywhere. The generation of dynamic voltage is as low as several thousand volts and as high as tens of thousands of volts. A large safety hazard of electrostatic breakdown.
In response to these details, we continued to explore and conduct special research. In the second half of 2007, we finally found that if we put the latest domestically-advanced project, anti-static tape technology, into another traditional advantage project, “SMT film” "The combination of the two is one, which will better meet the requirements for electrostatic protection in the electronic manufacturing process. However, in the implementation process, it encountered considerable difficulties. The difficulty itself is not a permanent anti-static, impedance value, temperature and humidity effects and friction resistance (these listed are all Ke Hongjian's technical advantages), and the biggest difficulty is the use of "SMT film" The adhesive tape is sticky. In order to ensure the reliability of SMT non-stop feeding, the belt is designed to achieve the highest viscosity. If there is anti-static coating on the back of the tape, the adhesive surface of the tape can easily transfer the anti-static coating. That is, the tape is stuck away from the antistatic coating, which affects the stability of antistatic. From the structural characteristics of the anti-static tape (as shown in Figure 1), how to prevent the anti-static coating from being migrated by the rubber surface? The most important thing is to firmly fix the antistatic coating on the substrate of the tape to form a molecular chain. In response to this technical problem, Kehong will not be afraid of difficulties in the R&D team, give full play to its technological advantages, combine foreign advanced technology, and after thousands of matching experiments, finally overcome this technical difficulty! In the first half of 2008, "SMT anti-static film" (shown in Figure 2) has passed the rigorous testing of many well-known domestic and foreign companies such as Huawei and Flextronics, reaching a dynamic electrostatic voltage of <30V (as shown in Figure 3). Up to now, through the comparison test with the products of the same industry in the world, the results show that the products of Haiwei Dahang have the best performance, and the products with the best requirements in the EMS process have become the best products in this market segment. Leader. At present, the products are very mature, stable and supplied in batches, and are widely praised by customers. The breakthrough of this technical problem has finally brought about an increase in the yield of the electronics manufacturing industry!
With the advent of the information society, electronic products will be more exquisite, reliable and miniaturized, and the requirements for electronic manufacturing processes will be more demanding. Haiweida Airlines is willing to work together with the majority of science and technology workers in the electronics industry to give full play to their anti-static core technologies. Advantages, attention to detail, improvement of problems, overcoming technical difficulties in the industry, good service, and meeting the new challenges brought by high quality and demanding products!
