The basic process of plastic wire and cable manufacturing

Update:07 Aug 2017

    Due to the use of features, laying the occasion, th […]

    Due to the use of features, laying the occasion, the working conditions of the different requirements of its product structure is also a variety of forms. The basic structure of the wire and cable is generally composed of: conductive wire core, insulation layer, protective layer composed of three parts.
   (1) copper, aluminum monofilament drawing wire and cable commonly used copper, aluminum rods, at room temperature, the use of wire drawing machine through a road or a few mold die die hole, so that the cross-section decreases, the length increases, The Drawing is the first wire and cable company's process, drawing the main process parameters is with the mold technology. Quality key points: size unqualified, surface failure
   (2) monofilament annealing copper, aluminum monofilament in a heated to a certain temperature, to recrystallize the way to improve the toughness of monofilament, reducing the strength of monofilament to meet the wire and cable to the requirements of conductive wire core. The key to annealing quality is to eliminate the oxidation of copper wire.
   (3) conductor twisting in order to improve the softness of the wire and cable in order to facilitate the laying
Installation, conductive wire core to take a number of single wire twisted together. From the twisted form of the conductive core, it can be divided into regular stranding and irregular twisting. Irregular twist is divided into beam twist, concentric twist, special twist and so on. Quality is the key to the wrong monofilament specifications, lack of root number, jumper, burr.

   (4) insulation extrusion plastic wire and cable mainly used squeeze solid insulation layer, plastic insulation extrusion of the main quality key: A. eccentricity: the thickness of the insulation thickness of extrusion is an important indicator of the level of extrusion process, Most of the product structure size and its deviation in the standard are clearly defined. B. Smoothness: the surface of the extruded insulation requires smooth, no surface roughness, scorching, impurities, the quality of the problem C. Density: Extrusion of the cross-section of the insulation to be dense and solid, not allowed to see the naked eye Hole, put an end to the existence of bubbles.
   (5) into the cable for multi-core cable In order to ensure the degree of molding, reduce the cable shape, generally need to be twisted into a circular. The mechanism of twisting is similar to that of the conductor, and the twist is larger. Quality key: First, roundness; the second is to prevent the insulation layer was scratched. Most of the cable in the cable at the same time with the completion of two other processes: one is filled to ensure that the cable after the round and stability of the cable; one is tied to ensure that the cable core is not loose.
   (6) shield to block the interference of external electromagnetic waves (radio frequency lines) or to prevent high-frequency signals in the cable to the outside of the interference (signal line) and the interference between the line (computer cable). The quality of the key is the density of substandard or uneven, there are burrs at the joint.
   (7) outer jacket outer sheath is to protect the insulation of the wire and cable to prevent environmental factors erosion of the structural part. The main role of outer sheath is to improve the mechanical strength of wire and cable, anti-chemical corrosion, moisture, water immersion, to prevent the ability of cable burning. According to the different requirements of the cable using extruder directly squeeze plastic.