-Basic process flow of Electrical wire and cable manufacturing

Due to the different requirements of service characteristics, laying occasions, and working conditions, the structural composition of its products is also in many forms.

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(1) Wire Drawing

Copper or aluminum rods commonly used for wires and cables are drawn through one or more die holes of the drawing die by a wire drawing machine at room temperature,

Increase in length and strength. Wire drawing is the first process of wire and cable companies and the main process of wire drawing

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(2) Monofilament annealing

When copper and aluminum monofilament are heated to a certain temperature, recrystallization is used to improve the toughness and reduce the strength of the monofilament

The key to annealing quality is to eliminate the oxidation of the copper wire

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(3) Stranding of conductors

In order to improve the flexibility of wires and cables and facilitate laying and installation, the conductive wire core is twisted by multiple single wires. Slave Guide

The key to quality is to use the wrong monofilament specification, missing number, jumper, and burr.

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(4) Insulation extrusion

The extruded solid insulation layer is mainly used for plastic wires and cables. The main quality key of plastic insulation extrusion:

A. Eccentricity: the deviation value of the extruded insulation thickness is an important sign of the extrusion process level. Most products are bonded

B. Smoothness: the surface of the extruded insulating layer shall be smooth without surface roughness, charring, and poor quality of impurities

C. Density: the cross-section of the extruded insulating layer shall be dense and solid, and there shall be no needle holes visible to the naked eye, so as to eliminate the existence of bubbles

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(5) Cabling

For multi-core cables, it is generally necessary to twist them into a circle in order to ensure formability and reduce the shape of the cable. Stranding

Quality key: first, roundness; The second is to prevent the insulating layer from being scratched.

Most cables are completed with the completion of two other processes: one is filling to ensure the roundness of the cable after cable completion

; One is binding to ensure that the cable core is not loose.

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(6) Shielding layer

Block the interference of external electromagnetic wave (RF line) or prevent the interference of high-frequency signal in cable (signal line) to the outside world

(computer cable).

The key to quality is unqualified or uneven density and burr at the joint.

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(7) Outer sheath

The outer sheath is a structural part to protect the insulating layer of wires and cables from environmental factors. The main function of the outer sheath is to lift