Method for manufacturing coaxial cable insulated layer and foam material and material processing technology

Abstract

The invention discloses a foam manufacturing method of the insulation layer of coaxial cables and the processing process of fluoroplastic foaming materials and materials, involving the field of coaxial cable manufacturing technology;When the opportunity, at a temperature of 200-500 ° C, the foamy FEP granules that can be mixed with nanomaterial fluoride or nitride can be dissolved. At the same time, high-pressure nitrogen or other inert gases are injected.Enter the foam extruder and the melted foaming FEP granules to be combined to expand foaming at the exit of the extrusion machine;The present invention has high foaming, closed, fine, and uniformity of bubbles, good foaming degrees of more than 80%, the cable decreases, the voltage resident wave ratio is low, the mechanical and physical properties of the bubble insulation layer are excellent, and it is easy to keep the hair.The advantages of the stability of the bubble crop process.

Description

technical field [0001] The invention relates to the manufacturing technology of coaxial cables, in particular to a manufacturing method for the insulating layer of the coaxial cable, a foamable fluoroplastic (FEP) insulating material and a technology for manufacturing the insulating material. The coaxial cable is a communication cable, including but not limited to a 50-ohm baseband cable for digital transmission and a 75-ohm cable for digital transmission. Coaxial cables are mainly used in cable television (CATV) networks and local area (bus type Ethernet) network. Background technique [0002] Ordinary communication coaxial cables, from the inside to the outside of the cable core, are followed by internal conductors, surrounding insulation layers, metal shielding nets and sheaths. It has been decades since the invention of coaxial cables by Bell Laboratories in the United States in 1929. . During this period, the insulating material of the insulating layer of the coaxial ...

AI Technical Summary

Problems solved by technology

In order to solve the extreme conditions of coaxial cables, such as high temperature resistance, low temperature resistance, acid and alkali resistance, and harsh environments, the current special coaxial cables use fluoroplastics (FEP) as the insulation layer, which solves the problem of ordinary coaxial cables under specific conditions. Problems that cannot be used normally

[0003] However, the current physical foaming technology of fluoroplastics often leads to poor uniformity of the radial and longitudinal cells of the insulation, and in serious cases, "big cells" will appear inside the insulation; The plastic is affected by the buoyancy, so that the insulating layer close to the conductor will appear "string holes" phenomenon; in addition, due to the uneven foaming process, there will also be uneven size particles; the foamed insulating layer has uneven cells and "big bubbles" "holes", "serial holes" and large and small particles will not only lead to increased cable attenuation and reduced voltage standing wave performance, the voltage standing wave ratio is usually between 1.25-1.30, which is difficult to meet the design requirements below 1.15; Causes poor consistency of the cable, has inhomogeneity, and has reflection points at high frequencies

Thereby causing interference and noise to the signal, and increasing the attenuation

Therefore, due to the technical constraints of physical foaming technology, the above-mentioned shortcomings of physical foaming fluoroplastic insulation layer have not been effectively solved so far, which has become a major technical problem in the industry

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