Wire and Cable 8 major production processes
Wire and cable
are based on the length of the basic unit of measurement. All wire and cable from the beginning of conductor processing, the conductor's outer layer with insulation, shielding, cable, sheath, etc. made of wire and cable products. The more complex the product structure, the more the level of the overlay.
1. Copper, aluminum single-wire drawing
Wire and cable commonly used copper, aluminum rod, at room temperature, the use of wire drawing machine through one or several channels die hole so that its cross-section to reduce the length increases, the intensity increased. Brushed wire is the first process of wire and cable companies, drawing the main process parameters is with die technology.
2. Monofilament annealing
Copper, aluminum monofilament heating to a certain temperature, in order to recrystallize the way to improve the toughness of monofilament, monofilament to reduce the strength to meet the wire and cable requirements of the conductive core. The Annealing process is to eliminate the oxidation of copper wire.
3. Stranded conductor
In order to improve the softness of the wire and cable, in order to facilitate laying installation, the conductive core to take a plurality of monofilament twisted together. From the conductive core of the twisted form, can be divided into a regular twist and irregular twist. The Non-regular twist is divided into the beam, twisted concentric, special stranded and so on.
In order to reduce the occupied area of ?the wire and reduce the geometric dimension of the cable, the stranded conductor is used at the same time as the straightened form so as to make the ordinary circular variation into a semicircle, a sector, a tile and a pressed circle. This conductor is mainly used in power cables.
4. Insulation extrusion
Plastic wire and cable are mainly extruded solid type insulation, plastic insulation extrusion of the main technical requirements:
1). Eccentricity: The deviation of the thickness of the extruded insulation is an important symbol of the level of extrusion technology, most of the product structure size and deviation in the standards are clearly defined.
2). Smoothness: Extruded insulation surface requires smooth, no rough surface, scorch, poor quality of impurities.
3). Density: Extruded insulation cross-section to be dense and firm, are not allowed to have pinhole visible to eliminate the existence of bubbles.
For multi-core cable in order to ensure the molding degree, reducing the cable shape, generally, need to be twisted into a circle. Stranding mechanism and conductor stranded similar, due to the larger diameter of the stranded section, most of the non-use anti-twist way. Cable into the technical requirements: First, to eliminate shaped insulated wire core turns caused by the cable twist; the second is to prevent the insulation is scratched. Most of the cable in the cable at the same time with the completion of the other two processes: one is filled, to ensure cable integrity and stability after cable; one is bound to ensure that the cable core is not loose.
6. Inner sheath
In order to protect the insulated core from being damaged by the armor, the insulation layer needs to be properly protected. The inner protective layer is divided into an inner protective layer (isolation sleeve) and an inner protective layer (cushion layer). Wrap around the mat instead of a binding band and cable process simultaneously.
Laying underground cables, work may be subject to a certain positive pressure, the choice of steel armor structure. Cable laying in both the role of positive pressure and pull the role of the occasion (such as water, vertical shaft or larger drop in the soil), should use the structure with steel wire armor.
8. Outer sheath
The Outer sheath is to protect the insulation of wire and cable to prevent the erosion of environmental elements of the structure. The main role of the outer sheath is to improve the mechanical strength of wire and cable, chemical corrosion, moisture, water immersion, to prevent cable burning and other capabilities. According to the different requirements of the cable using the extruder directly extruded plastic sheath.
Information about the wire and cable production process for everyone introduced here, I hope this article is helpful to everyone.