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Types of conductive shielding materials

What is conductive shielding?

Types of conductive shielding materials

Electrical shielding is used to prevent interference with components due to high voltage field strengths. The design principle of electrical shielding is to minimize the distributed capacitance between the interference source and the receptor by using the shield to minimize the effect of the interference source on the receptor.

Electrical shielding materials are various materials used between heat sources and heat sinks to accelerate heat dissipation efficiency by excluding the air between heat sources and heat sinks, thus making the heat of electronic devices more evenly dispersed. Generally, various thermally conductive interface materials need to have good thermal conductivity and surface wettability.

Conductive shielding materials mainly include the following aspects.

Conductive adhesive: a class of adhesives with conductive properties, conductive adhesive is a cured or dried with certain conductive properties of the adhesive, it is usually based on the base resin and conductive filler that is conductive particles as the main component, through the adhesive effect of the base resin to the conductive particles are combined to form a conductive pathway to achieve a conductive connection of the bonded material.
As the basic resin of the conductive adhesive is an adhesive, you can choose the appropriate curing temperature for bonding, and at the same time, due to the miniaturization of electronic components, miniaturization, and printed circuit boards, high density and highly integrated rapid development, and the conductive adhesive can be made into a paste, to achieve a very high line resolution. And conductive adhesive process is simple, easy to operate, and can improve production efficiency, so the conductive adhesive is an alternative to lead and tin soldering, to achieve the ideal choice of conductive connection.

Conductive shielding materials

Conductive shielding materials are mainly conductive foam, conductive cloth, conductive double-sided tape, copper foil, aluminum foil, and wave-absorbing materials. The following is to understand the use of these series:

conductive tape Foam

Conductive foam

  • Conductive foam is mainly divided into ordinary conductive foam and a full range of conductive foam. The use of textile fiber cloth containing metal plating covered with elastic PU foam made of good elasticity and conductivity is widely used in a variety of electronic products for EMI prevention and control.
  • Usage: suitable for occasions that can not provide greater pressure, play a good role in electromagnetic sealing. Such as electronic shielding chassis, notebook computers, mobile communication equipment, plasma displays, etc..

Omni-directional conductive foam

  • mainly by the foam and wrapped in the foam around the conductive cloth composition, in which the foam body is equipped with a vacuum plating on the metal substance, its low cost, three-dimensional shielding effect is good, and can play a metal-like excellent protective properties.
    Characteristics: good shielding effect, good electrical conductivity, high friction resistance, flame retardant, and thermal conductivity.
    Use: Adapt to the shielding of various computers, TVs, notebooks, card readers, and other products.

Conductive Fabric

Conductive cloth is mainly divided into plaid-type conductive cloth and knitted conductive cloth. Lattice cloth has good conductivity, good shielding effect, and good processability, suitable for wrapping into various types of rules and irregular common conductive foam preferred material, mainly for ultra-thin shielding, conductive cloth foam, conductive cloth tape, conductive cloth liner, etc., with good friction resistance. Knitted conductive cloth has good anti-friction properties, is easy to stamp and process molding after wrapping, low-cost easy to wrap the molding nature of the I / O liner preferred material.

Conductive cloth: As the conductive cloth is highly metalized nylon or polyester material substrate, with excellent conductive properties equivalent to metal, at the same time there is good toughness and can be wound performance, back conductive adhesive is a variety of electronic and electrical appliances and communications equipment shielding the ideal material, at the same time on the circuit board or a variety of surfaces of the shielding and grounding is also very suitable.

  • The main categories of plaid-type conductive fabrics:
  • Fabric type: plaid;
  • Metal plating: nickel/copper;
  • Conductivity: < 0.05 ohm/square;
  • Advantages: easy to mold, strong shear resistance, friction resistance ;

Characteristics of lattice-type conductive cloth:

  1. good electrical conductivity, surface resistance below < 0.07 ohm/square.
  2. good shielding effect, shielding effectiveness up to 60dB or more.
  3. good processability, soft texture, slitting without burrs, easy-to-wrap molding.
  4. suitable for wrapping into various types of regular and irregular common conductive foam preferred materials.
  5. mainly used in ultra-thin shielding, conductive cloth foam, conductive cloth tape, and conductive cloth liner.
  6. good anti-friction performance, anti-friction times up to 500,000 times ( ASTM-D4966 );
  • The main categories of knitted conductive fabric:
  • Fabric type: knitted conductive fabric;
  • Metal plating: nickel/copper;
  • Conductivity: < 0.07 ohm/square;
  • Advantages: low cost, suitable for I/O foam wrapping;

Knitted conductive fabric features:

  1. good anti-friction performance, anti-friction times up to 400,000 times ( ASTM-D4966).
  2. low cost and easy-to-wrap molding properties make it the preferred material for I / O pads.
  3. Easy to press and mold after wrapping.
Copper Foil, Aluminum Foil

Copper Foil, Aluminum Foil

  • A kind of metal copper and aluminum directly calendered into a thin sheet of material, applied to electronic products generally the content of 99% or more, the material is soft, ductility is good, with a silver-white or golden-yellow luster. However, it is easy to oxidize and darken the color, friction, touch, etc. will change color, so the processing must have good protection measures.
    Copper foil, and aluminum foil in the electronics industry are mainly used in copper tape conductive, thermal conductivity, heat dissipation, magnetic shielding, anti-static, and other purposes. The material hardness is not high, usually below 0.2mm, and very easy to process, while easy to deform.
  • Copper foil, aluminum foil applications:
    Mainly used to eliminate electromagnetic interference EMI, and isolate the harm of electromagnetic waves to the human body, mainly used in computer peripheral wires, computer monitors, and transformer manufacturers.
    Application of copper foil, and aluminum foil: suitable for all kinds of transformers, cell phones, computers, PDA, PDP, LCD monitors, laptops, copiers, and other various electronic products within the need for electromagnetic shielding.

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