Parallel pair wrapping is a very important process in high-frequency cables. The wrapping machine is to gather two insulated core wires and ground wires together, and at the same time, wrap a layer of aluminum foil and a layer of self-adhesive polyester tape on the outside. It is used for shielding wire pairs and stabilizing the core wire structure. This process has an important impact on the performance of the wire, which will directly affect the characteristic impedance of high frequency, SKEW, attenuation, etc. High-speed wire is different from other wires in structure, so the cable The manufacturing process is also different and needs to be handled carefully. In the end, in order to avoid damage to the core wire structure and cause poor electrical performance of the finished bare wire, the following will tell you why the wrapping process is important.
1.Most of the high-speed wire conductors use a single silver-plated copper structure, which is relatively less bendable than stranded conductors, and is not easy to recover after bending. The conductor is bent, which affects the performance. In the process of wrapping with aluminum foil, it is very important to minimize the extrusion and deformation of the cable. The equipment accounts for more than 80 percent of the high-frequency poor risk control.
2.As mentioned above, the high-speed wire part is a structure of physical foaming, and the highest foaming degree of physical foaming is as high as about 60 percent . So far, the insulation performance is very good, but its mechanical properties are gradually lost. When stretched, it is easy to be deformed and will destroy the structure of the foam layer. Therefore, during the tape processing process, the insulating core wire should be prevented from being squeezed or stretched as much as possible, so as not to affect the performance by electricity. The tape tape equipment occupies more than 60 percent of the high frequency of this process. Poor risk control.
3.Since most of the high-speed wire pairs have a parallel wrapping structure and no twisting pitch, the bending performance is poor, and it is easy to lengthen and short wires. Therefore, during the wrapping process, the wrapping wire pair should be avoided as much as possible to reduce pair winding. For the damage of the package structure, try to fit and protect the insulated core wire as much as possible. The tape equipment occupies more than 40 percent of the high-frequency poor risk control in this process.
