Communication cable with low dielectric constant insulation structure

Abstract

The invention discloses a communication cable with a low dielectric constant insulation structure, which comprises a cable core, wherein, the cable core is composed of four pairs of wire pairs; each pair of wire pairs is formed by twisting two insulated core wires mutually; A cable core shielding layer is coated on the cable core, and each pair of wire groups is coated with a pair of wire shielding layers; The insulating core wire comprises a core wire conductor, wherein the core wire conductor is sequentially coated with an inner layer of silica gel, a foam layer, an outer layer of silica geland a thin film layer of the core wire from the inside to the outside; The thickness of the silica gel inner layer and the silica gel outer layer is 3 [mu] m-5. [mu]m, and that thickness of the corewire film lay is 4[mu]m-6[mu]m. The silica gel inner layer and the silica gel outer layer are coated with room temperature silicone rubber. The core wire film layer and the cable core film layer are high-temperature polyester film layers. The communication cable not only has excellent electrical performance, but also has chemical resistance, water resistance and high temperature resistance.

Description

technical field [0001] The invention relates to a digital communication cable which is used in many communication occasions such as intelligent buildings and data centers, and has fast data transmission speed and reliable safety. Background technique [0002] With the rapid development of data communication and network information technology and the continuous improvement of computer performance, the application of 10 Gigabit copper Ethernet has become the mainstream of data centers. It mainly refers to the enhanced copper cabling system of Category 6e and above, which can support various applications of 10 Gigabit Ethernet and below. The overall bandwidth of conventional Category 6e cables is 500MHz. With the rapid development of structured integrated wiring system, Gigabit Ethernet can no longer meet the broadband requirements of users, and 10 Gigabit Ethernet will become the mainstream technology. The corresponding digital communication cables need to be from Category 7 t...

AI Technical Summary

Problems solved by technology

Theoretically, the insulating layer on the insulated core wire conductor adopts a foamed structure completely, and its dielectric constant will become lower, which will be more conducive to the improvement of high-frequency digital signal transmission performance, but the fully foamed insulating layer structure always On the one hand, the adhesion between the metal conductor and the insulating layer is weak, and it is easy to shift the physical position of the conductor and move in series; It not only seriously affects the relative position of the conductors of the wire group, but also affects the insulation performance of the core wire. Therefore, most of the insulated core wires in communication cables adopt a skin / foam / skin structure made of polyolefin

Due to the limitation of polyolefin material and extrusion process, it is impossible to extrude the solid inner skin layer and the solid outer skin layer too thin. It must be at least 30 μm, and the solid outer skin layer will reach a thickness of millimeters, which actually occupies the thickness space of the foam layer and limits the further reduction of the dielectric constant of the insulating layer.

[0005] During the use of communication cables, they will inevitably be affected by the chemical components in the external environment and the plasticizers and solvents in the cable sheath. As the use time continues to prolong, harmful chemical components will It will gradually or accidentally transfer to the shielding layer of the insulating core wire, especially when the cable is in an environment polluted by complex chemical substances such as acid and alkali, these harmful chemical components will not only corrode the insulating core wire of the cable, Moreover, it will also erode and change the insulating material properties of the insulating core wire and the dielectric constant of the insulator, thereby changing the impedance performance of the communication cable, which not only directly affects the transmission performance of the digital communication cable, but also makes it difficult to ensure the long-term stable high frequency of the digital signal of the communication cable , high-speed transmission, and even seriously affect the safe and reliable transmission of digital signals

[0006] At the same time, because the metal conductor and the solid inner skin of the insulated core wire are made of different materials, the adhesion of the solid inner skin to the metal conductor is insufficient, and the three-layer insulation structure is easy to move in series on the conductor, so that the two wires in the wire group The relative position of the root metal conductor is displaced or changed, which in turn causes changes in the structural parameters of the wire group, resulting in an unstable cable structure and affecting the improvement of the operating frequency and data transmission speed of high-frequency digital communication cables.

[0007] Communication cables are used more and more widely. Not only may they be laid in high-temperature and flammable environments, but they may also be laid in humid environments. In high-temperature and flammable environments, the sheath layer of communication cables is prone to melting and softening. , lose the function of the sheath to protect the cable; and when the cable is in a humid working environment, moisture will invade the cable protective layer, even the core wire insulation layer, which will not only accelerate the aging speed of the insulation layer, shorten the service life of the cable, but also completely Change the dielectric constant of the insulating layer of the insulating core wire, so that the electrical performance of the communication cable is seriously deteriorated

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