What is aluminum foil for cables?
The outer surface of the cable needs to be wrapped with a layer of aluminum foil for protection and shielding. This aluminum foil is usually made from 1145 grade industrial pure aluminum. After continuous casting and rolling, cold rolling, slitting and complete annealing, it is divided into small rolls according to the length required by the user and supplied to the cable foil composite factory. The surface of the aluminum foil is covered with plastic. The film is cut into several small strips and supplied to the cable factory in roll form.
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Cable foil is made by pasting special plastic film (0.058mm thick) on the upper and lower surfaces of 0.15mm-0.20mm thick aluminum foil. There are two attachment methods: dry attachment and wet attachment. The dry method uses high temperature (200℃) rolling method to apply the film; the wet method uses glue. At present, dry methods are mostly used. After attaching the plastic film, use a special instrument to tear the film off the aluminum foil to determine the degree of adhesion of the plastic film. This measurement is very important and is called peel strength. According to the communication cable industry standard (code name YD/T723.2-94), the strength should not be less than 6.13N/cm; in addition, the heat sealing strength should not be less than 17.5N/cm. The surface quality of aluminum foil is the main factor affecting the peel strength. The main surface quality problems are oil spots, corrosion, and excessive oxidation.
Cable foil utilizes the air tightness and shielding properties of aluminum foil, and is coated with plastic film on one or both sides to form an aluminum-plastic composite foil, which is used as a cable shielding layer. Cable foil needs to have a small amount of oil on the outside, no holes, and high mechanical properties. Generally speaking, the length requirements of cable aluminum foil are extremely strict.
Why cables use aluminum foil
Aluminum foil is commonly used as a cable shielding material for a number of reasons, including its effectiveness against electromagnetic interference (EMI) and radio frequency interference (RFI), flexibility and cost-effectiveness. Here are some key reasons to use aluminum foil in electrical cables:
EMI and RFI Shielding: Aluminum foil provides excellent electromagnetic interference (EMI) and radio frequency interference (RFI) shielding properties. It acts as a barrier that reflects and absorbs electromagnetic waves, preventing them from penetrating the cable and interfering with the signals carried by the inner conductor.
Flexibility: Aluminum foil is highly flexible and can conform to the shape of the cable, making it suitable for a variety of cable designs and configurations.
Light weight: Aluminum foil is a lightweight material, and using aluminum foil as a shield will not significantly increase the weight of the cable.
Corrosion resistance: Aluminum foil has natural corrosion resistance due to the thin oxide layer formed on its surface.
