There are many correct or incorrect processes in the manufacturing process of the shielding layer. 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 the cable outer diameter must be taken into account. Unreasonable braiding angle of the shielding layer will further increase the tension load and lead to damage of the shielding layer. This will weaken the shielding effect, and even cause short circuit when the sharp cable tail pierces the wool fabric or foil gold material to contact the core wire. If the insulating layer is peeled off, the shielding layer can be easily pushed back into the sheath. However, such a shielding layer cannot be applied to the moving high flexible cable in the energy supply system.

　　The braiding angle of the shielding layer determined by the wire and cable manufacturers through long-term experiments can effectively offset the tension, so it is very suitable for drag chains. Due to the stable inner sheath, the shielding layer will not relax and fail. In the twisted wire structure, the shielding layer itself has anti torsion performance.

　　The sheath is worn or damaged

　　The defects of any internal structure of wire and cable manufacturers are difficult to detect from the outside, but the sheath can be directly observed with the naked eye. The sheath is the first layer of protection for the precise internal structure of the cable. This is why cracked, worn and expanded sheaths are very serious quality problems. In order to avoid such problems, Henan Guodian cable provides seven kinds of cable sheaths of different materials 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 chains, the sheath is usually tubular, so it is unable to provide necessary support for the stranded structure during long-term bending, so that the stranded structure is easy to split. As the first manufacturer of drag chain system, eagles has developed an armor type extruded sheath.