Flame-retardant digital signal cable for rail transit and production process

Abstract

One or more embodiments of the present specification provide a flame-retardant digital signal cable for rail transit and a production process, the flame-retardant digital signal cable for rail transit comprises an inner layer and an outer layer, the inner layer comprises a plurality of conductors, a skin-foam-skin polyethylene insulating layer is extruded outside each conductor, an inner shielding group is coated outside each conductor, the outer layer comprises a first flame-retardant layer, an aluminum sheath, a steel tape armoring, a second flame-retardant layer and a sheath from inside to outside. A B1-level special high-flame-retardant halogen-free low-smoke ceramic oxygen barrier layer material is adopted as a heat insulation layer, flame and heat are prevented from being transmitted into the cable core, polyethylene insulation combustion is avoided, meanwhile, a ceramic shell formed by combustion prevents oxygen from entering the cable core, combustion of the cable is reduced, the B1-level halogen-free low-smoke flame-retardant sheath material is adopted, the smoke amount and combustion heat of the cable are reduced, meanwhile, the cable has the advantages of being free of halogen, low in smoke, flame-retardant, low in toxicity and the like, when the cable is combusted, the total heat dissipation amount of the cable is low, and the safety of the rail transit cable in a sealed environment is greatly improved.

Description

Technical field [0001] One or more embodiments of the present specification relate to the field of cable production, particularly refers to a flame retardant digital signal cable and production process for rail transit. Background technique [0002] With the increased operation of rail transit, the rapid increase in new operations and the continuous expansion of the wire network, and the pressure and challenge of rail traffic safety operation is also increasing. Rail transit should have high specifications for power cables for power supply systems, in particular, involving fire safety, and currently do not specifically specifically for urban rail transit power cable B1 combustion performance level requirements. [0003] In particular, urban rail transit, which involves a variety of technical fields, composed of a variety of equipment, a variety of hardware and software, and a variety of facilities, has a major social impact, and its security has always been the focus of people. T...

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