Production process of amplitude-stabilized and phase-stabilized cable

Abstract

The invention discloses a production process of an amplitude-stabilized and phase-stabilized cable. The production process comprises the following steps: a low-density polytetrafluoroethylene wrappingtape wrapping process is carried out on a central conductor to form an insulating dielectric layer of the cable; a silver strip wrapping process is carried out on the dielectric layer after high-temperature shaping to form an inner-layer shield of the cable; a silver-plated copper wire braiding process is carried out on the inner-layer shield to form an outer shielding layer and a cable protective layer; and high-temperature fluoroplastic extrusion is carried out to form an environment-resistant protection layer of the cable. The dielectric layer needs to be subjected to high-temperature andlow-temperature cold and heat treatment, and for the cable subjected to high-temperature and low-temperature cold-heat treatment, plasma spraying treatment is carried out in advance during silver-plated copper strip wrapping production in the next procedure. On the basis of not changing the structure of the original amplitude-stabilized and phase-stabilized cable, the thermal expansion and cold contraction coefficients of the materials are close to each other when the cable is extruded out of a sheath at a high temperature through the control of a production process, and a gap between a seconddielectric layer and a third inner-layer shield is reduced, so that the phase stabilization performance is improved.

Description

technical field [0001] The invention relates to the technical field of cable production and manufacturing, in particular to a production process for cables with stable amplitude and stable phase. Background technique [0002] At present, the stable amplitude and phase stable cable structure is as follows: including silver-plated copper central conductor, polytetrafluoroethylene wrapped dielectric layer, silver-plated copper tape wrapped inner layer shield, silver-plated copper wire braided outer shield layer and high temperature extruded sheath Floor. [0003] The center conductor is wrapped with low-density polytetrafluoroethylene tape as the insulating medium layer of the cable. The medium layer needs to be heat-set at high temperature to prevent the medium layer from loosening; silver tape is wrapped on the medium layer after high-temperature setting process to form the inner shield of the cable, and the silver-plated copper wire weaving process is carried out on the inn...

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Problems solved by technology

[0004] The amplitude and phase stability produced by this process is often not up to the standard due to the amplitude stabilization performance. The amplitude stabilization performance is ±0.2dB~0.5dB, and the mechanical phase stabilization is ±5°~±7°. If the amplitude stabilization performance is too large, the cable will often be reduced. The service life and signal transmission quality cause quality problems such as signal transmission errors. Such cables are far from meeting the actual needs of customers, resulting in low yield, high price, and delayed delivery.

[0005] The main reason is that the thermal expansion and contraction coefficients of the PTFE wrapping tape and the silver-plated copper used in the cable are different. The thermal expansion and contraction of PTFE is (1.09*〖10 〗^(-4)~2.165*〖10〗^(-4))m / ℃, the heat-air contraction coefficient of copper is 17.7×〖10〗^(-6)m / ℃, which leads to When the sheath comes out (high temperature 400°C) and after extrusion (normal temperature), there will be a tiny gap between the second dielectric layer and the third inner layer shield, so that the electromagnetic wave model of the cable is unstable during bending, shaking, etc. , The insertion loss is too large, that is, the stability performance is poor

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