Introduction to Cable Shielding Materials

An important role of the data cable is to transmit data signals. But when we actually use it, there may be all kinds of messy interference information. Let’s think about if these interfering signals enter the inner conductor of the data cable and are superimposed on the originally transmitted signal, is it possible to interfere or change the originally transmitted signal, thereby causing loss of useful signals or problems?

Cable

The braided layer and aluminum foil layer protect and shield the transmitted information. Of course not all data cables have two shielding layer, some have multiple shielding layer, some have only one, or even none at all. shielding layer is a metallic isolation between two spatial regions to control the induction and radiation of electric, magnetic and electromagnetic waves from one region to another.

Specifically, it is to surround the conductor cores with shields to prevent them from being affected by external electromagnetic fields/interference signals, and at the same time to prevent the interference electromagnetic fields/signals in the wires from spreading outward.

Generally speaking, the cables we are talking about mainly include four kinds of insulated core wires, twisted pairs, shielded cables and coaxial cables. These four kinds of cables use different materials and have different ways of resisting electromagnetic interference.

The twisted pair structure is the most commonly used type of cable structure. Its structure is relatively simple, but it has the ability to evenly offset electromagnetic interference. Generally speaking, the higher the twisting degree of its twisted wires, the better the shielding effect achieved. The inner material of the shielded cable has the function of conducting or magnetically conducting, so as to build a shielding net and achieve the best anti-magnetic interference effect. There is a metal shielding layer in the coaxial cable, which is mainly due to its material-filled inner form, which not only has It is beneficial to the transmission of signals and greatly improves the shielding effect. Today we will talk about the types and applications of cable shielding materials.

Aluminum foil Mylar tape: Aluminum foil Mylar tape is made of aluminum foil as the base material, polyester film as the reinforcing material, bonded with polyurethane glue, cured at high temperature, and then cut. Aluminum foil Mylar tape is mainly used in the shielding screen of communication cables. Aluminum foil Mylar tape includes single-sided aluminum foil, double-sided aluminum foil, finned aluminum foil, hot-melt aluminum foil, aluminum foil tape, and aluminum-plastic composite tape; the aluminum layer provides excellent electrical conductivity, shielding and anti-corrosion, can adapt to a variety of requirements.

Aluminum foil Mylar tape

Aluminum foil Mylar tape is mainly used to shield high-frequency electromagnetic waves to prevent high-frequency electromagnetic waves from contacting the conductors of the cable to generate induced current and increase crosstalk. When the high-frequency electromagnetic wave touches the aluminum foil, according to Faraday’s law of electromagnetic induction, the electromagnetic wave will adhere to the surface of the aluminum foil and generate an induced current. At this time, a conductor is needed to guide the induced current into the ground to avoid the induced current from interfering with the transmission signal.

Braided layer(metal shielding) such as copper/ aluminum-magnesium alloy wires. Metal shielding layer is made by metal wires with a certain braiding structure through braiding equipment. The materials of metal shielding are generally copper wires(tinned copper wires), aluminum alloy wires, copper-clad aluminum wires, copper tape(plastic coated steel tape), aluminum tape(plastic coated aluminum tape), steel tape and other materials.

Copper Strip

Corresponding to metal braiding, different structural parameters have different shielding performance, the shielding effectiveness of the braided layer is not only related to the electrical conductivity, magnetic permeability and other structural parameters of the metal material itself. And the more layers, the greater the coverage, the smaller the braiding angle, and the better the shielding performance of the braided layer. The braiding angle should be controlled between 30-45°.

For single-layer braiding, the coverage rate is preferably above 80%, so that it can be converted into other forms of energy such as heat energy, potential energy and other forms of energy through hysteresis loss, dielectric loss, resistance loss, etc., and consume unnecessary energy to achieve the effect of shielding and absorbing electromagnetic waves.

en_USEN

FREE SAMPLE TERMS

ONE WORLD Is Committed To Providing Customers With Industleading High-Quality Wire And Cable Matenals And First-Classtechnical Services

You Can Request A Free Sample Of The Product You Are Interested Inwhich Means You Are Willing To Use Our Product For Production
We Only Use The Experimental Data You Are Willing To Feedback Andshare As The Verification Of Product Characteristics And Quality , Andthen Help Us To Establish A More Complete Quality Control System Toimprove Customers’ Trust And Purchase Intention , So Please Restassured
You Can Fill Out The Form On The Right To Request A Free Sample

Application Instructions
1 . The Customer Has An International Express Delivery Account Orvoluntarily Pays The Freight ( The Freight Can Be Returned In The Order )
2 . The Same Institution Can Only Apply For One Free Sample Of Thesame Product , And The Same Institution Can Apply For Up To Fivesamples Of Different Products For Free Within One Year
3 . The Sample Is Only For Wire And Cable Factory Customers , And Onlyfor Laboratory Personnel For Production Testing Or Research

SAMPLE PACKAGING

Aluminum-Foil-for-Food-Packaging
Aluminum-Foil-for-Food-Packaging

FREE SAMPLE REQUEST FORM

Please Enter The Required Sample Specifications , Or Briefly Describe Theproject Requirements , We Will Recommend Samples For You

After submitting the form , the information you fill in may be  transmitted to the ONE WORLD background for further processed to determine product specification and address information with you. And may also contact you by telephone. Please read our Privacy Policy  For more details.

Thank you for your inquiry