Cable Foaming Technology Upgrade

- Apr 15, 2019-

The integrity of the communication network, in addition to the hardware and software in the computer room and its peripheral equipment, the communication cable plays the role of the main transmission medium for the communication between the two ends of the sending and receiving signals. The quality of the communication cable should not only meet the requirements of the overall service digital network (ISDN) in the future, but also the space occupied cannot be ignored. The two are closely related. In nearly a decade to make communication network transmission more quickly, in addition to the equipment to strengthen, communication cable also made significant changes, foaming polyethylene are used as insulation materials, prompting cable features more in line with the better effect of communication, including electrical characteristics such as electrostatic capacitance, capacitance unbalance, far end crosstalk (nearly) and attenuation with materials such as foam way more immediate.

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The purpose of foaming

The purpose of general material foaming is to make the product light weight, and strengthen the product heat insulation and disturbance, and reduce the cost of materials, and the purpose of cable materials foaming, is to reduce the material medium constant.

Advantages and disadvantages of foaming:

A. Lightening the quality can also reduce the cost of materials.

B. Small dielectric coefficient, low high-frequency attenuation, stable performance, good water and moisture resistance and bending, small outer diameter of resistance, long service life.

Foaming shortcomings: poor adhesion, poor strength

Why does it have such disadvantages?

In the process of the system of PE insulation material, mixing ratio appropriate heating foaming agent, its make the core process, using prompted produce chemical decomposition of foaming agent temperature change in PE material internal form bubbles, the material response is quite sensitive to temperature (+ / - 1 ℃), the temperature control equipment was slightly affected by the outside world, great changes its foaming degree, at present the way foaming degree can reach 40-50%, and the foaming materials shall be placed in the dry environment, otherwise the water into the material after extruding easy to cause the conductor capacitance, outer diameter is not stable.

Foaming method of materials on the market

In order to increase the transmission capacity and rate and reduce the Dielectric Constant of the material, the best way is to use the foaming PE material, which can be generally divided into two ways:

(1) chemical foaming method

(2) physical foaming (nitrogen foaming)

1. Traditional chemical foaming

In the process of the system of PE insulation material, mixing ratio appropriate heating foaming agent, its make the core process, using prompted produce chemical decomposition of foaming agent temperature change in PE material internal form bubbles, the material response is quite sensitive to temperature (+ / - 1 ℃), the temperature control equipment was slightly affected by the outside world, great changes its foaming degree, at present the way foaming degree can reach 40-50%, and the foaming materials shall be placed in the dry environment, otherwise the water into the material after extruding easy to cause the conductor capacitance, outer diameter is not stable, the binomial far (near) in communication cable end will cause bad effect.

In order to reduce the medium constant, the substrate used shall be the material with low medium constant. PE is the most commonly used cable at present. In special occasions, PP, PS and TEFLON are also used as the base material.



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