What is the production process of wire and cable?

1. Copper and aluminum monofilament drawing: cable commonly used copper, aluminum rods, at room temperature conditions, with one or more wire drawing machine to pull the die hole, so that its cross-section is reduced, the length increased, the strength increased. In various wire and cable companies, wire drawing is a process, the main process parameters of wire drawing is to match the mold technology. 2. monofilament annealing: copper wire, aluminum wire heated to a certain temperature after recrystallization, so that the monofilament toughness increases, monofilament strength decreases, so that it meets the requirements of the conductive core of wires and cables. In the annealing process to prevent oxidation of copper wire is the key. 3. wire stranding: conductive core using multiple monofilament stranded way to improve the softness of the wire and cable to facilitate laying. According to the form of conductive core stranding, can be divided into regular stranding and non-regular stranding. Unconventional stranding is divided into bundle stranding, concentric compound stranding, special stranding, etc.. In order to reduce the area occupied by the conductor, reduce the geometric size of the cable, in the stranded conductor at the same time using the form of tight pressure, so that the ordinary circle mutated into a semicircle, fan-shaped, tile-shaped, tightly rounded. This conductor is mainly used for power cables.4. Insulation extrusion: plastic wire cable is mainly used extruded solid type insulation, its main technical requirements are: extrusion insulation.4 (1) Eccentricity: the deviation of the thickness of the insulation is to reflect the level of the extrusion process is an important symbol of the structural dimensions of the majority of the products and their deviation values are clearly specified in the standard.4 (2). Smoothness: the surface of the insulation after extrusion is required to be smooth, and there shall be no surface roughness, burning, impurities and other undesirable quality problems.4 (3) Density: the cross-section of the extruded insulation layer shall be dense and firm, and no pinholes visible to the naked eye shall be allowed, and the emergence of bubbles shall be eliminated.5. Rope: for multi-core cables, in order to ensure the degree of molding, and to reduce the shape of the cables, the cables are usually required to be rolled up into a round shape. The mechanism of the winch is similar to the conductor stranding, due to the stranding of the larger section diameter, more than one way to use the non-return twist. Technical requirements for cable formation: first, to avoid shaped insulation core flip caused by cable bending; second, to prevent the insulation layer is scratched. Most of the cable in the cable at the same time accompanied by the completion of two processes: one is filled to ensure that the cable into the cable round and stable; one is tied to ensure that the core is not loose. 6. Internal protection: to protect the insulated wire core from armor injury, the need for proper protection of the insulation layer, the inner layer is divided into: extrusion of the inner sheath (isolation sleeve) and winding the inner sheath (cushion layer). Winding pad layer and cable process can be synchronized instead of taping. 7. armor: laid on the underground cable, can withstand a certain positive pressure, can be selected within the band steel armor structure. In the case of positive pressure and tensile two roles, cable laying should be selected with internal steel wire armor structure type, such as water, shafts, fall difference of the soil. 8. Shell: the outer sheath is to prevent environmental factors on the wire and cable insulation layer erosion. The main role of the outer sheath is to improve the mechanical strength of wire and cable, chemical corrosion resistance, moisture, water immersion, preventing cable combustion. According to the different requirements of the cable, the use of extrusion machine directly extruded plastic sheath.

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