Processing process of lotus-root-core-shaped polytetrafluoroethylene insulation layer for radio frequency cable

Abstract

The invention relates to a processing process of a lotus-root-core-shaped polytetrafluoroethylene (PTFE) insulation layer for a radio frequency cable. The process comprises the following steps: fixing a push inner mould with a push machine guide rod, fixing a push outer mould to an outer mould seat, and putting a PTFE prefabricated rod into a push machine steel barrel; enabling a silver-jacketed wire conductor to penetrate through the push machine guide rod, an inner conductor pipe and the push outer mould in sequence to be connected with a traction wire; fixing the outer mould seat with the steel barrel, starting a push machine main engine, wrapping the PTFE prefabricated rod around the inner conductor pipe and a plurality of empty pipes through the push inner mould and the outer mould, and enabling the PTFE prefabricated rod to pass through the straight pipe opening of the push outer mould to form the lotus-root-core-shaped PTFE insulation layer with the silver-jacketed wire conductor in the middle and a circle of through holes in the periphery; discharging, shaping, volatilizing an extrusion aid through a volatilizing box, sintering in a sintering furnace at the high temperature, checking through a spark machine, and dragging through a traction machine to obtain a product. The process has the characteristics that as air is in lotus root cores, the equivalent dielectric constant of the insulation layer is greatly reduced and the cable attenuation is reduced by at least 20%.

Description

technical field [0001] The patent of the present invention relates to a processing technology for the core-type polytetrafluoroethylene insulating layer used in radio frequency cables. This insulating layer is widely used as insulating cores in semi-flexible radio frequency cables, semi-steel radio frequency cables and SFF radio frequency cables. The finished product The line can be used in mobile communication, microwave launch, navigation and other systems. Background technique [0002] At present, the radio frequency cables (semi-flexible or semi-steel cables) used in mobile communication, microwave measurement and other systems in China have solid polytetrafluoroethylene insulation layers, which have a large dielectric coefficient and large attenuation when transmitting signals. Contents of the invention [0003] In view of the deficiencies in the prior art, the invention provides a processing technology for the core-type polytetrafluoroethylene insulating layer used i...

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Problems solved by technology

[0002] At present, the radio frequency cables (semi-flexible or semi-steel cables) used in mobile communication, microwave measurement and other systems in our country are all solid-core polytetrafluoroethylene, with a large dielectric coefficient and large attenuation when transmitting signals.

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