Wires and cables are made through three processes: drawing, stranding, and covering. The more complex the model and specification of the high-temperature cable, the higher the repeatability.

    1. Draw

    In metal pressure processing. Under the action of external force, the metal is forced to pass through the mold (press wheel), the cross-sectional area of the metal is compressed, and the technical processing method to obtain the required cross-sectional area shape and size is called metal drawing.

    The drawing process is divided into: monofilament drawing and twisting drawing.

    2. Stranded

    In order to improve the flexibility and integrity of the wire and cable, two or more single wires are intertwined in a prescribed direction, which is called twisting.

    The stranding process is divided into: conductor stranding, cable formation, braiding, steel wire armoring and winding.

    3. Cladding

    According to the different performance requirements of high-temperature wires and cables, special equipment is used to coat different materials on the outside of the conductor. The coating process is divided into: extrusion package: rubber, plastic, lead, aluminum and other materials. Longitudinal package: rubber, wrinkle baotang materials. Winding: ribbon-shaped paper tape, mica tape, alkali-free glass fiber tape, non-woven fabric, plastic tape, etc., linear cotton yarn, silk and other fiber materials. Dip coating: insulating paint, asphalt, etc.

Then, the following is the basic process flow of plastic wire and cable manufacturing.

1. Copper and aluminum monofilament drawing

Commonly used copper and aluminum rods for wires and cables, at room temperature, use a wire drawing machine to pass through one or several stretch die holes to reduce the cross-section, increase the length, and increase the strength. Wire drawing is the first process of various wire and cable companies, and the main process parameter of wire drawing is die matching technology.

2. Monofilament annealing

Copper and aluminum monofilaments are heated to a certain temperature to increase the tenacity of the monofilament and reduce the strength of the monofilament by recrystallization, so as to meet the requirements of the wire and cable for the conductive core. The key to the annealing process is to prevent the oxidation of the copper wire.

3. Stranding of conductors

In order to improve the flexibility of the wire and cable and facilitate the laying and installation, the conductive core is made of multiple monofilaments twisted. From the stranding form of the conductive core, it can be divided into regular stranding and irregular stranding. Irregular stranding is divided into bundle stranding, concentric twisting, special stranding and so on.

In order to reduce the occupied area of the Teflon wire and reduce the geometric size of the cable, the compacted form is adopted while the conductor is twisted, so that the ordinary circle is transformed into a semicircle, a sector, a tile shape and a compacted circle. This kind of conductor is mainly used in power cables.