The twenty-first century is the age of electronic information, the field of communication is expanding, with the continuous upgrading of electronic products and the continuous change of the consumer market, electronic equipment is gradually developing to smaller and thinner aspects, "signal transmission" wire requirements wire diameter is getting smaller and smaller, so the wires used in electronic equipment also need to be smaller and thinner. Moreover, a variety of fireproof high-temperature cables are also more and more application scenarios, requiring high-performance transmission cables must also meet the requirements of high-frequency transmission performance and small and flexible on the basis of taking into account fire safety performance, and under the premise of the same impedance, if the wire diameter is reduced, smaller dielectric constant materials are required. The higher the foaming degree of our conventional high-frequency (physical foaming, chemical foaming PE/PP) compound, the smaller the dielectric constant, so fluoroplastics came into being, and the wire insulation between 30~42AWG has been widely used Teflon materials; If Teflon requires smaller or faster signal transmission rates on a small basis, it is necessary to use the Teflon foaming technology introduced today.
Why do we use fluoroplastics?
With the vigorous development of the economy of the world, high-rise buildings continue to create new heights, high-rise buildings must use fluoroplastic FEP insulation based on CMP fireproof cable, in addition to the cable fire protection requirements put forward higher requirements, with the emergence of new energy and new technologies, the transmission performance of high-tech electronic equipment is also put forward more and more requirements. The structure of its corresponding supporting cables gradually develops in a smaller direction. For example, in high-rise buildings or aerospace, nuclear power plants, medical equipment and other special occasions, its monitoring cables and signal transmission cables in addition to fire resistance and high temperature resistance. Higher and higher transmission frequencies are also required. Therefore, more and more of this type of cable in addition to fluoroplastic for insulation, but also use physical foaming technology to reduce the average dielectric constant of the fluoroplastic insulation layer, so that the attenuation of the fluoroplastic insulated core is greatly reduced, and the transmission rate and mechanical characteristics of the cable are greatly improved. Under the condition of achieving the same electrical properties, the size of the wire core is reduced, which can greatly save insulation materials and reduce costs, and the transmission performance of the wire core is also greatly improved. Taking the commonly used 50 ohm coaxial cable as an example, compared with the solid insulation using fluoroplastic, the effect is shown in the figure below under the same electrical parameters and performance conditions.
If the foaming degree is increased from 0% to 50% solid, the material can be saved by about 66%, while the transmission rate ratio (relative to the transmission rate of the signal in a vacuum) can be increased from 66% to 81%. Taking the general typical fluoroplastic FEP (polyperfluoroethylene propylene) as an example, the material per kilometer can save nearly 20,000 yuan (calculated according to the price of DuPont FEP material about 300 yuan / KG), if the foaming degree is further increased from 50% to 70%, the material can save 81%, and the transmission rate ratio can reach about 88%, which shows that the material savings will be considerable.
Fluoroplastic insulated cables use physical foaming technology
As can be seen from Figure 1 above, in order to meet the requirements of fire performance and transmission performance, the use of physical foaming technology for fluoroplastic insulation is necessary, and the higher the degree of foaming, the smaller the cable core can be made, the more economical the material and the better the transmission performance, the earliest fluoroplastic foaming equipment should be Swiss Merafil company, from 1995, it through the United States famous fluoroplastic DuPont cooperation, research and development and successful design of a series of new patented technology and corresponding equipment, As a result, the insulation foaming degree of the previous fluoroplastic wire core has successfully reached about 65% from about 50% in one fell swoop. Production practice has proved that the effect of saving materials is very significant, in order to meet the increasing safety performance requirements, the material range of fluoroplastics is also expanding more and more, more and more materials with superior fire performance have emerged, such as PFA, ETFE and other fluoroplastics, which can meet the requirements of various cable cores and different temperature resistance levels.
With the current development of 5G / medical technology in various countries around the world as a strategic development goal, "artificial intelligence", "virtual reality" and so on under the blessing of 5G, computing and data transmission rate will be greatly improved, fluoroplastic foaming technology and so on are applied to the new production line, providing a full set of solutions including high-end digital communication cables and micro-coaxial medical cables and other products, these solutions are very suitable for some customers who need to develop in the field of high-end communication and development.
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Post time: Jul-20-2023