Cable manufacturing process

The shielding layer mainly acts as an anti-electromagnetic interference to the outside, and prevents the electromagnetic field generated by itself from being used to interfere with the surrounding environment and the fault current.

According to the requirements of the use of shielding performance requirements, the materials used are also different, such as copper wire braided shield, copper tape around the shield, copper wire around the shielding, aluminum alloy wire braided shield, copper clad aluminum wire braided shield, aluminum plastic composite tape Wrapped around the shield and so on. In order to ensure the continuity of the shielding layer and reduce the transfer resistance of the shielding layer, the wrapping of the copper tape requires that one or more annealed copper wires be placed longitudinally in the shielding layer as a drainage line. The shielding properties are often measured by measuring the suppression coefficient (R) of the shielding layer. Copper wire braided shield R=0.07 > Copper tape wrap shield R=0.02> Copper wire twisted (reverse tie wire) R=0.01

The main direction of copper shield current is the same as the copper ribbon spiral! The path through which the copper shield current flows is short! Less calories! With two layers of copper shield, the shield cross-sectional area increases! Reduced current flow! The amount of heat emitted is also reduced! The same can serve as a shield signal. However, for the 500mm2 large current carrying capacity, the electromagnetic field generated by itself is also larger. When the short-circuit current exceeds a certain value, the effective cross-section value of the 0.12mm copper strip of the second layer cannot achieve the relatively large and effective effect of the copper wire winding. Section value, from the above comprehensive consideration, copper wire sparse winding (plus reverse tie) its sparse winding effect is much better than other shielding methods, and more reliable continuity, so use copper wire around the shielding.