Damage and prevention of shielded cable

Feb 28, 2020

In the manufacturing process of shielding layer, there are many correct or incorrect processes. One of the most important parameters is the braiding angle of the shielding layer.
In the cable used for drag chain, the load borne by the shielding layer of cable outer diameter must be taken into account. Unreasonable braiding angle of the shielding layer will further increase the tension load, resulting in the damage of the shielding layer. As a result, the shielding effect will be weakened, and when the sharp cable tail is punctured by wool fabric or foil gold material to contact the core wire, it will even cause short circuit. Here, we recommend a useful tip: if you peel off the insulation layer, you can easily push the shielding layer back into the sheath, but such a shielding layer can not be applied to the high flexible cable moving in the energy supply system. Of course, eagles can provide direct solutions to these problems:
The braiding angle determined by long-term experiments can effectively offset the tension, so it is very suitable for drag chain.
Due to the stable inner sheath, the shielding layer will not relax and fail.
In the strand structure, the shielding layer itself has the anti torsion performance.
Worn or damaged sheath
The defects of any internal structure are difficult to detect from the outside, but the problems of the sheath can be directly observed by the naked eye. The sheath is the first layer of protection for the precise internal structure of the cable. This is why the cracked, worn and distended sheath is a very serious quality problem. In order to avoid this problem, igus provides seven different materials of cable sheath for users to choose according to the corresponding working environment of their machinery.
Armor type extruded sheath
Manufacturing process and materials are also important factors to determine product quality. In some so-called cables suitable for drag chain, the sheath is usually tubular, so it is unable to provide necessary support for the strand structure in the long-term bending process, so that the strand structure is easy to split.
As the first manufacturer of drag chain system, igus developed a kind of armor type extrusion molding sheath.
This sheath ensures that the core of the cable does not loosen when it is in motion. The reason is that the sheath is extruded by a very large pressure. It is like a guide groove, which plays a guiding role in the movement of the core wire and also plays a supporting role. So it is very suitable for drag chain.
This paper summarizes the quality assurance of high flexible cable suitable for drag chain: central stress relief design; multi bundle cable forming structure; armour type extruded inner sheath used in shielded cable; full screen insulated woven mesh; optimized shielding weaving angle; armour type extruded sheath.

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