Rubber insulated wire and cable:

Rubber insulated wire and cable has experienced more than one hundred years of development history, he is the oldest of all wire and cable products in the history of the species, many of its types, widely used in all types of wire and cable. Rubber insulated wire and cable has excellent electrical insulation properties, chemical stability, especially in the other wire and cable can not be compared to the flexibility and better physical properties

Rubber insulated wire and cable has excellent electrical insulation properties, chemical stability, especially the other wire and cable can not be compared to the flexibility and good physical properties and widely used. Rubber insulated wires and cables are mostly used for mobile or working conditions, such as ships, mines, underground, rolling stock, etc.. With the development of rubber industry, all kinds of artificial synthetic rubber and constantly develop developed, such as silicone rubber, chloroprene rubber, ethylene propylene rubber, styrene butadiene rubber, chlorosulfonated polyethylene and so on. With synthetic rubber in the cable industry generally applied in the rubber insulated wire and cable properties are improved, not only has the inherent advantages of natural rubber, and increase the oil resistance, flame resistance, cold resistance, heat resistance and other excellent valuable performance, so that rubber insulated wire and cable varieties are even more abundant and a wider range of applications, involving all areas of the national economy. The wide range of its application is not comparable to other types of wire and cable.

Rubber insulated wire and cable is also the same as other wire and cable, usually by the three basic structure of vision, that is, conductive wire core, insulation layer and sheath layer. Wire and cable conductor core is used to conduct electricity, in order to reduce the loss of wire in the conductive wire, generally used with a high conductivity of metal materials, the most commonly used copper and aluminum. And the size of the cross-sectional area of the conductor, it depends on the size of the transmission current, so that the conductor has less heat and less damage to the insulation layer. In addition, the conductor should also have good physical and mechanical properties, such as high tensile strength, certain elongation. For rubber insulated wire and cable, to has good flexibility and its manufacturing process and different occasions to meet the installation requirements, usually in order to make the guide wire has the better flexibility. In general, the more fine single stranded and. The finer the single wire is composed of the conductive wire core. The more the number of roots, the more soft the line core.

The insulation layer is to prevent the leakage of the current along the radial direction, so that the current can only flow along the conductive core. Therefore, the insulating layer of the material must have a good electrical insulation performance, can withstand considerable voltage, with a high resistance to the theater and the lower ring loss. In addition, the insulating layer must have a certain physical mechanical properties and good processing performance. Thickness of insulation, mainly according to the high and low voltage cables, insulation material itself the withstand voltage strength and in use may receive bending, torsion, stretching and other external mechanical force and the role of comprehensive factors, also want to consider the feasibility of processing, in some special occasions. Such as flammable, high temperature, chemical and other occasions, it is necessary to use some special properties of the insulation material.

Sheath layer is an insulating layer outside the protected part of. It protects the insulation layer from outside of the media and the role of mechanical damage, because the wire and cable in the laying of the use process, inevitably by various external complicated and unfavorable factors of influence. The most common mechanical action, such as tension, compression, bending, torsion, friction, vibration, etc.; chemical corrosion, such as acid, alkali, salt erosion, as well as physical factors, such as light, heat, wet effect, these negative factors or alone or in combination will have long-term effects on the wire and cable, so cable protective layer according to the types of wire and cable, use and environment using different has a variety of forms and structures, such as the need to bear the external force of need by steel or steel wire armour; laying in corrosive environment of the need to adopt anticorrosive sheath and so on. The thickness of the sheath is generally determined by simple calculations based on the size of the cable, the applicable occasions and the long run experience.

Commonly used wire and cable protective layer has the following structural forms

Woven fiber layer: the protecting layer structure is characterized by simple, soft, thin, can only pray Baohua effect, simple, generally used for wire, if necessary, in the outer layer of woven reapply a layer of preservatives.

Rubber or plastic sheath: rubber sheath with good flexibility, softness, wear resistance and cold resistance. The plastic sheath is resistant to oil, acid, alkali and chemical resistance. These two kinds of protective devices are widely used in the electric wire and cable, and the two kinds of protective devices are used for the electric wire and cable of the electric equipment.

Armor: cable used for the channel or buried, often encounter considerable external mechanical force, general rubber or plastic sleeve unbearable, in this case requires take a metal armouring layer, strengthen the cable with steel wire or steel, in order to be able to withstand considerable external mechanical force.

Outer protective layer to prevent the armoring was chanting corrosion, some cable need in armored layer plus protection layer, such as Lek velvetleaf was layer or a polyvinyl chloride sheath layer.