Carbon dioxide physically foamed radio frequency coaxial cable insulation cable core manufacturing method

A radio frequency coaxial cable and carbon dioxide technology, which is applied in the manufacture of coaxial cables, insulating conductors/cables, etc., can solve the problem of low foaming degree, affecting attenuation and standing wave performance of radio frequency coaxial cables for 3G, and large transmission loss, etc. problem, to achieve the effect of high foaming degree, improving competitiveness and less production consumables

Active Publication Date: 2011-12-07
ZHONGTIAN RADIO FREQUENCY CABLE CO LTD
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  • Summary
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AI Technical Summary

Problems solved by technology

Usually, the insulation layer of physically foamed insulated cables is made of nitrogen foam, which has low foaming degree and large transmission loss, which seriously affects the attenuation and standing wave performance of 3G RF coaxial cables

Method used

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  • Carbon dioxide physically foamed radio frequency coaxial cable insulation cable core manufacturing method
  • Carbon dioxide physically foamed radio frequency coaxial cable insulation cable core manufacturing method

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Experimental program
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Effect test

Embodiment Construction

[0019] Carbon dioxide physical foaming radio frequency coaxial cable insulation core production method is as follows:

[0020] (1) The inner conductor of the insulated core of the carbon dioxide physical foamed 3G radio frequency coaxial cable is an oxygen-free copper tube. After being straightened by a straightening device, it is sized by a drawing die and cleaned by ultrasonic waves before entering the extruder. The water tank is cleaned, and then preheated to 20-30°C by induction, and the inner skin layer is extruded by an extruder. The inner skin layer material is prepared from polyethylene and resin in a weight ratio of 4:1. The resin is an ion bond polymer such as ethylene-(meth)acrylic acid zinc salt, sodium salt, lithium salt, etc. Resin selects commercially available polymethyl methacrylate or polybutyl methacrylate etc. for use.

[0021] (2) Prepare foaming material, which is mixed and melted by high-density polyethylene, low-density polyethylene and nucleating age...

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Abstract

The invention relates to a method for manufacturing high foaming carbon dioxide physically foamed radio frequency coaxial cable insulating cores, in particular to a production process for radio frequency coaxial cable insulating cores used in the third generation data mobile communication 3G. The production method is as follows: (1) The inner conductor of the insulating cable core is straightened, sized, and ultrasonically cleaned, and after preheating, the inner skin layer is extruded by an extruder; (2) The foaming material is prepared, which is made of high-density polyethylene, Low-density polyethylene and nucleating agent are mixed and melted into a polymer at a high temperature of 180-220°C in the extruder; (3) Liquid carbon dioxide is injected into the melted polymer in the extruder through a small hole gas injection needle under high pressure Carbon dioxide foaming agent; (4) At high temperature, through the rotation of the extruder screw, the molten polymer and carbon dioxide foaming agent are uniformly mixed; (5) The mixture is extruded on the 3G radio frequency coaxial cable through the extruder head The periphery of the inner conductor is foamed to make a foamed insulating cable core; (6) The foamed insulating cable core is made into a carbon dioxide physically foamed radio frequency coaxial cable insulating cable core after three-stage cooling treatment.

Description

technical field [0001] The invention relates to a method for manufacturing high foaming carbon dioxide physically foamed radio frequency coaxial cable insulating cores, in particular to a production process for radio frequency coaxial cable insulating cores used in the third generation data mobile communication 3G. Background technique [0002] With the development of the third-generation data mobile communication 3G and the issuance of 3G licenses, the three major operators have started the establishment of 3G networks nationwide, and 3G has entered the stage of large-scale construction. Widening, the communication rate is getting higher and higher. Therefore, the requirements for 3G radio frequency coaxial cables are getting higher and higher, and they must have low attenuation and standing wave ratio. The insulation of the cable core wire is the main medium for transmitting communication signals, so the insulation processing technology is good. Bad directly affects the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/016H01B13/20
Inventor 薛济萍蓝燕锐王强吴付亮许波华
Owner ZHONGTIAN RADIO FREQUENCY CABLE CO LTD
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