Environment-friendly digital symmetrical cable

Abstract

The invention provides an environment-friendly digital symmetrical cable which comprises pair-stranded wire groups, pair-stranded shielding layers, an inner sheath layer, a main shielding layer and an outer sheath layer sequentially from center to outside. Each pair-stranded wire group comprises a core and an insulating layer and is formed by stranding two wires, and each core which is tin-coated copper core is wrapped by the corresponding insulating layer which is a crosslinked polyethylene insulating layer. The pair-stranded shielding layers are formed by braiding tin-coated copper wires, the inner sheath layer is made of polyethylene, the main shielding layer is longitudinally wrapped by an aluminum foil, and the outer sheath layer is a low-smoke, zero-halogen and flame-retardant polyolefin outer sheath layer. The environment-friendly digital symmetrical cable contains no heavy metal such as lead, cadmium and hexavalent chromium and bromine series flame retardants and generates no harmful halogen gas and corrosive gas, the toxicity index of the cable is smaller than or equal to 1, fuming quantity in combustion is low, the light transmittance in combustion is larger than or equal to 75%, and soil contamination is avoided.

Description

technical field [0001] The invention relates to a digital symmetrical cable, in particular to a green and environment-friendly digital symmetrical cable. Background technique [0002] Ordinary cables are generally insulated and sheathed with chlorine-containing polymers such as polyvinyl chloride. In the event of a fire accident, polyvinyl chloride cables will produce a large amount of smoke and precipitate toxic gases such as hydrogen chloride. In addition to posing a direct threat to human life, they will also dissolve and form dilute hydrochloric acid to adhere to various electrical equipment and steel structures of buildings. Seriously reduce the safety of equipment and the service life of buildings, especially when smoke enters communication technology equipment and data technology equipment, it will cause them to lose their normal functions, and even cause "secondary disasters". The ordinary environmental protection cable means that the PVC sheath material it uses ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a green and environmentally friendly digital symmetrical cable to solve the problem that the environmental protection performance of the cable is still not ideal, and its smoke generation and toxicity index are still high when it is burned, and it cannot meet the environmental protection requirements day by day.

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