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Electrical cable manufacturing process

Release time:2016-05-09 15:49 hit:


electrical cable manufacturing process
Electrical cable is by drawing, stranding, covered of three kinds of process to complete, specifications are more complex, higher repeatability.
 
1. Copper, aluminum wire drawing
 
Wire and cable used copper, aluminum rod, at room temperature, using wire drawing machine through one or several drawing die of die hole, the cross section of the decreased and increased in length and to increase its strength. Drawing is the first process of the wire and cable companies manufacturing process, the main process parameters are drawing die technology.
 
2. Monofilament annealed
 
Copper, aluminum wire in the heating to certain temperature, recrystallization to improve monofilament toughness, reduce monofilament intensity. In order to meet the requirements of wire and cable for the guide wire core requirements. The key of annealing process is to prevent the copper wire oxidation.
 
3. The conductor stranding
 
In order to improve the flexibility of wire and cable, to facilitate laying and installation, conductive wire core adopt a plurality of filaments twisted. From the guide wire core stranded form, can be divided into regular and irregular twisted strands. Irregular twist is divided into strands, concentric stranding compound, special twisted etc.
 
In order to reduce the occupied area of the wire, the geometric size of the cable is reduced, the stranded conductor at the same time adopts the compression form, so that ordinary circular variaty into semicircle, sector, tile and pressed round. This conductor is mainly used in power cable.
 
4. insulation extruded
 
Plastic wire and cable is mainly used extruded solid insulation layer, plastic insulation extrusion main technical requirements:
 
4.1. eccentricity: the deviation of the insulation thickness is an important sign of the extrusion process level, and most  product structure size and its deviation value are clearly defined in the standard.
 
4.2. smooth degree: the surface of the extruded insulation layer is smooth, and the surface roughness, coke burning, and the bad quality of impurities are not allowed to appear.
 
4.3. density: Extrusion insulation layer of the cross section should be dense and strong, not visible to the naked eye pinhole, to prevent the existence of bubbles.
electrical cable manufacturing process
 
5. cabling 
 
For multi-core cable in order to ensure the forming degree, reduce the cable shape, generally need to be twisted round. Stranded conductor system and mechanism is similar, because the hinged section of larger diameter, used mostly without backtwist way. Into the cable technical requirements: one is to eliminate the special-shaped insulating core wire stand up while leading the cable bending; the second is to prevent insulation layer from being scratched.
Most of the cable in cabling at the same time, along with completion of the other two processes: one is filled, to ensure the cable roundness and stability; another is binding, to ensure the cable core no loose.
 
6. Protective layer
 
To protect the insulation wire core not hurted by armoured, adequate protection of the insulating layer, inner protective layer is divided into: squeeze bag sheath (distance sleeve) and wrapping inner protecting layer (cushion layer). Wrapping layer instead of lashing and cabling process synchronization.
 
7. armouring
 
Laying underground cables, may bear a certain positive pressure during operation, can choose armour steel belt structure. Cable laying in both positive pressure and pulling force of occasions (such as water, vertical shaft or larger drop soil), should  select inner steel wire armored structure type.
 
8. outer sheath
 
outer sheath is the structure that protects the insulation layer of the wire and cable to prevent the erosion of environmental factors. The main function of the outer sheath is to improve the mechanical strength of the electric wire and cable, prevent chemical corrosion, moisture proof, water proof and the ability to prevent the burning of the cable. According to the different cable requirements, use extruder direct extruded plastic sheath.

Electrical cable manufacturing process:


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