Low-smoke halogen-free low-toxicity public safety fireproof cable manufacturing method

Abstract

The invention relates to the field of cable manufacturing, in particular to a low-smoke halogen-free low-toxicity public safety fireproof cable manufacturing method. The method comprises the specificmanufacturing steps of material selection, drawing, twisting of a power line core and a conductor, fire-resistant layer lapping, insulating layer extrusion, warm water crosslinking of an insulation wire core, insulation wire core cabling, filling and lapping, fire-resistant layer extrusion, armoring, outer sheath extrusion, finished product inspection and finished product. Compared with an existing cable manufacturing method, the method has the performance requirements for combustion indexes and is matched with the actual engineering application, the fireproof safety requirement is higher, therequirements such as flaming droplet / particle grade, smoke toxicity, corrosion grade and the like are provided, and the escape probability of people in the fire disaster is greatly increased; the conductor is twisted by adopting special-shaped monofilaments., compared with the prior art, the compression filling coefficient is greatly increased, the smooth roundness of the surface of the conductoris increased, and the cable manufacturing cost is saved on the premise of ensuring the product quality.

Description

technical field [0001] The invention relates to the field of cable manufacturing, in particular to a method for manufacturing a low-smoke, halogen-free, low-toxic fireproof cable for public safety. Background technique [0002] At present, the regulations on the use of flame-retardant cables in some necessary places in my country's engineering construction fire protection codes are very general. For places that require special protection, the cables used should have a higher combustion rating. The flame-retardant cables produced according to the existing GB / T19666 "General Rules for Flame-retardant and Fire-resistant Wires and Cables" can no longer meet the needs of these special occasions. , in order to match the actual engineering applications and minimize the possible fire hazards, it is necessary to develop new flame-retardant cables. [0003] For example, the Chinese Patent Publication No. CN201410592788.X discloses a method for preparing an irradiated cross-linked polye...

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Problems solved by technology

[0002] At present, the regulations on the use of flame-retardant cables in some necessary places in my country's engineering construction fire protection codes are very general. For places that require special protection, the cables used should have a higher combustion rating. The flame-retardant cables produced according to the existing GB / T19666 "General Rules for Flame-retardant and Fire-resistant Wires and Cables" can no longer meet the needs of these special occasions. , in order to match the actual engineering application and minimize the possible fire hazards, it is necessary to develop new flame-retardant cables

[0003] For example, the Chinese Patent Publication No. CN201410592788.X discloses a method for preparing an irradiated cross-linked polyethylene insulated low-voltage power cable, which belongs to the field of cable manufacturing technology. The insulated wire core composed of the insulated wire core, the cable core composed of the insulated wire core, the filling material in the gap between the cable core, the cable wrapping layer wrapped around the cable core, the inner sheath layer extruded outside the cable wrapping tape, and the wrapped metal The armor layer and the extruded outer sheath are prepared by the following steps in turn: material selection→wire drawing→annealing→conductor stranding→extrusion and irradiation of the insulating layer→cable stranding and cable wrapping Wrapping→extruding the inner sheath→wrapping the metal armor layer→extruding the outer sheath layer, but the specific experimental parameters, extrusion methods, and finished product inspection methods are not specifically disclosed, so that users still have corresponding difficulty

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