CN107993770A - A kind of low manufacture method for discharging environmentally protective shielded cable of high fire-retardance - Google Patents

A kind of low manufacture method for discharging environmentally protective shielded cable of high fire-retardance Download PDF

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Publication number
CN107993770A
CN107993770A CN201711232920.6A CN201711232920A CN107993770A CN 107993770 A CN107993770 A CN 107993770A CN 201711232920 A CN201711232920 A CN 201711232920A CN 107993770 A CN107993770 A CN 107993770A
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CN
China
Prior art keywords
cable
insulation
retardance
wrapped
layer
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Pending
Application number
CN201711232920.6A
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Chinese (zh)
Inventor
黄静
盛业武
陈光高
沈智飞
刘小兵
毛开裕
靳荐宇
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Sichuan Star Cable Co Ltd
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Sichuan Star Cable Co Ltd
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Application filed by Sichuan Star Cable Co Ltd filed Critical Sichuan Star Cable Co Ltd
Priority to CN201711232920.6A priority Critical patent/CN107993770A/en
Publication of CN107993770A publication Critical patent/CN107993770A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/02—Stranding-up
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/003—Apparatus or processes specially adapted for manufacturing conductors or cables using irradiation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/10—Insulating conductors or cables by longitudinal lapping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping

Abstract

The invention discloses a kind of manufacture method of the low environmentally protective shielded cable of release of high fire-retardance, this method comprises the following steps：Sorting, wire drawing, conductor or conductor strand, wrapped refractory insulating layer, extruded insulation, cross-linking radiation, stranding, metallic shield, extrude oxygen barrier layer, dress armour, it is wrapped, extrude oversheath, properties of product detection and finished product packing storage.The cable that the present invention manufactures overcomes the high smoke of halogen fire-retardant electric wire, highly toxic drawback, and new edition cannot be reached by also solving Halogen fire-retardant electric wire《Design of civil buildings specification》Regulation, there is the ability for resisting extraneous electromagnetic interference and the ability of system outside Radiative EMI in itself, may be such that the anti-flammability of cable reaches A grades, combustibility reaches B1Level, flue gas toxity reach t0Level, density flaming droplet/particulate class reach d0Level, corrosive nature grade also can reach a1Level, can be used in civil buildings extensively.

Description

A kind of low manufacture method for discharging environmentally protective shielded cable of high fire-retardance
Technical field
The present invention relates to field of cable technology, is specifically a kind of low system for discharging environmentally protective shielded cable of high fire-retardance Make method.
Background technology
Electric wire refers to for electric power, electric and associated transport purposes material.Electric wire is to transmit electricity (magnetic) energy, information and the wire product for realizing electromagnetic energy conversion.Main carriers of the electric wire as power transmission, are widely used in Electrical equipment, illuminating line, household electrical appliance etc., the quality of its quality directly influence construction quality and the life of consumer Property safety is ordered, it is main to include the aerial bare wire for electric system, power cable etc., the local telephone network for the information transmission system Cable, camera cable, electronic cables, fiber optic cables etc., and data cable, instrument and meter cable for machinery instrument system Deng.
Flame retardant cable refers to that under regulation experimental condition sample is burned, and after experiment burning things which may cause a fire disaster is removed, the sprawling of flame is use up In the range of restriction, residual flame or it is residual burn in limiting time can self-extinguish cable.Burning can be limited in office by the cable In the range of portion, flame is not spread, other equipment can be protected, avoid resulting in greater loss.With scientific and technological level not It is disconnected to improve, fire-retardant problem by past halogen flame retardant, further develop into low halogen, Halogen it is flame-retarded.Nowadays in car Stand, subway, airport, hospital, large-scale library, gymnasium, villa, home dwelling, hotel, hospital, office block, school, business Crowded place, the Halogens, low cigarette, flame-retardancy requirements and safety and environmental protection all to cable such as field are more demanding.
In existing market using more flame retardant cables be divided into it is halogen series and Halogen system, and fire-retardant grade according to The volume of sample nonmetallic materials is broadly divided into tetra- class of A, B, C, D.Wherein, halogen fire-retardant electric wire relies primarily on halogen The HCL that fire retardant is decomposed thermally to form reaches fire-retardant purpose, therefore to improve flame retardant rating, to increase in cable insulation, sheath Halogen dosage so that the exhaust gas volumn and toxicity discharged during cable fire sharply increases, therefore all there are occurred frequently for such flame retardant cable Cigarette, highly toxic drawback.When fire occurs, dense black smoke and hydrogen chloride (HCL) gas can be discharged, trapped person is because seeing Less than evacuation path, suck toxic gas and suffocate, form secondary disaster；In addition, to can only achieve C classes fire-retardant for such flame retardant cable Rank, combustibility can only achieve B3Level, has been difficult to base oneself upon in flame retardant cable now.It is big in civil buildings now Most civil electric appliances all can radiated electromagnetic wave, and cable is frequently subjected to the interference of radiated electromagnetic wave, and then can influence cable itself Working performance and service life, and cable itself can also irradiate electromagnetic signal, can cause shadow to the environment of people's daily life Ring.
The fire retardant of the flame-retardant electric wire and cable of Halogen series is free of halogen, and current halogen-free flame retardants is mainly hydrogen-oxygen Change magnesium or aluminium hydroxide.This kind of material is mainly using polyethylene as matrix, by EVA----- by ethene (E) and vinylacetate (VA) a large amount of magnesium hydroxides or aluminium hydroxide activated are mediated in base polyethylene, and fire retardant mechanism is as follows：First, hydroxide Thing is decomposed reaction when burned, which is the endothermic reaction, absorbs the amount of heat in surrounding air, and it is electric to reduce burning The temperature of line cable surface；Second, the hydrone of generation, also absorbs the amount of heat on electric wire surface；Third, the gold produced Belong to oxide crust, prevent contacting again for oxygen and organic matter.So low smoke halogen-free flame-retardant polyolefin is using heat absorption Come with the method for metal oxide oxygen barrier fire-retardant.Although such flame retardant cable can reach A class fire-retardant ranks, due to cable Combustible is more and burning can not receive suppression, is that cable heat release rate and heat release are total in the case of smoke-producing amount is less Value is high.So the combustibility of the flame retardant cable of Halogen series cannot reach new edition《Design of civil buildings specification》In Regulation：High-rise building answers selective combustion performance B1Level and the above, production smoke toxicity are t0Level, density flaming droplet/particulate class are d0 The electric wire and cable of level；Answer selective combustion performance B in the public place of first class high storey building and densely populated place1Level, production smoke toxicity are t1 Level, density flaming droplet/particulate class are d1Level wants electric wire.
The content of the invention
In view of the deficiencies of the prior art, it is an object of the invention to propose a kind of environmentally protective shielding electricity of the low release of high fire-retardance The manufacture method of cable so that the cable manufactured overcomes the high smoke of halogen fire-retardant electric wire, highly toxic disadvantage End, new edition cannot be reached by also solving Halogen fire-retardant electric wire《Design of civil buildings specification》Regulation, have The ability of extraneous electromagnetic interference and the ability of system outside Radiative EMI in itself are resisted, may be such that the anti-flammability of cable reaches To A grades, combustibility reaches B1Level, flue gas toxity reach t0Level, density flaming droplet/particulate class reach d0Level, corrosive nature etc. Level also can reach a1Level.
To achieve the above object, the technical solution adopted in the present invention is：
A kind of low manufacture method for discharging environmentally protective shielded cable of high fire-retardance, this method comprise the following steps：(1) conductor Or conductor strand；(2) wrapped refractory insulating layer；(3) extruded insulation；(4) cross-linking radiation；(5) stranding；(6) metallic shield；(7) Extrude oxygen barrier layer；(8) armour is filled；(9) it is wrapped；(10) oversheath is extruded；
The wrapped refractory insulating layer refers to conductor or the core of conductor strand step formation in concentric type multiple layer high speed It is wrapped 2~3 layers overlapping using mica tape on winding machine, and wrapped cap rate >=20%；The refractory insulating layer is through excess temperature 950 DEG C -1000 DEG C of flame temperature detection；
The extruded insulation refers to double hyer insulation expressing technique, including primary insulation and outer layer insulation, primary insulation and outer Primary insulation and outer layer insulation are extruded in conductor thread core by layer insulation at the same time using double-deck extrusion unit using half tubular molding tool On, the outer surface rounding of the outer layer insulation, smooth and section pore-free；The primary insulation uses Radiation Crosslinked Polyethylene material Material, the outer layer insulation use cross-linking radiation polyolefine material；
The stranding refers to be twisted the insulated wire cores after more cross-linking radiations according to the direction that pre-establishes, pitch Close, and be subject to inflaming retarding high-temperature gasket for packing between core gap, oxygen index (OI) OI >=35% of the inflaming retarding high-temperature gasket for packing, fusing point >=260 DEG C, overlapping wrapped netted high fire-retardance glass fibre band makes a plurality of insulated core become a rounding tight outside core Close core is overall；
The metallic shield refer to after stranding the wrapped metal tape of outer layer of cable core or it is wrapped by metal wire knitted and Into metal mesh；
The oxygen barrier layer that extrudes refers to that the low-smoke halide-free fireproof composite polyolefine material of the extrusion high fire-retardance on extruding machine is extruded in On metal screen layer, oxygen index (OI) OI >=40% of the low-smoke halide-free fireproof composite polyolefine material of the high fire-retardance；
The dress armour, which refers to be spirally wound on outside oxygen barrier layer using the double-deck wrapped or wire individual layer of metal tape, forms dress armour Layer；
It is described it is wrapped refer to dress sheath outside wrapped 1-2 floor heights combustion-proof glass fiber band；
The oversheath refers to the low-smoke halide-free fireproof composite polyolefine material that high fire-retardance is extruded on extruding machine, and the high fire-retardance Low-smoke halide-free fireproof composite polyolefine material oxygen index (OI) OI >=36%.
It is further to further include sorting and wire drawing before conductor or the conductor strand step；The wire drawing is using electricity Work round copper rod is drawn into the circular copper monofilament of various specifications by multiple wire-drawing dies of special wire-drawing equipment；Pass through dedicated drawing Multiple wire-drawing dies in silk equipment to the circular copper monofilament of more clock specifications, it can be achieved that carry out wire drawing, the low release of the high fire-retardance is green The manufacture method that colour circle protects shielded cable does not limit the specification of circular copper monofilament.
It is further that the conductor refers to the conductor directly as product by the circular copper monofilament that drawing step is formed, The conductor strand refer to by more circular copper monofilament according to pre-establish radical, rule, strand to pitch in conductor process Carried out in equipment twisted formation press into it is circular or it is non-press circular or shaping conductor, the conductor wringing equipment can be that fork twists Machine, frame winch, wire stranding machine, outermost direction of lay are left-hand；As the case may be, according to the knot for the cable core being pre-designed Structure, can be directly made of circular copper monofilament, can be also twisted more circular copper monofilament.
It is further that the thickness of the extruded insulation layer is 0.6-1.0mm, and the thickness of the inner insulation layer is 0.2- 0.3mm, the thickness of the outer insulation is 0.4-0.7mm；The inner insulation layer uses radiant crosslinked polyethylene material, protects The electrical property of cable is demonstrate,proved, outer insulation uses irradiated crosslinked polyalkene material, not only can guarantee that cable insulation core passes through Single fire retardancy test, also can guarantee that the combustibility of cable meets that dropping/particulate class reaches d0Level, i.e. 1200s are interior without combustion Performance and resistance to elevated temperatures are burnt, double layer of insulation is coated using co-extrusion, the weakness between different materials can be made up so that be made Cable can have very high electrical property, shielding, insulating properties and anti-flammability at the same time；The extrusion unit processing of the primary insulation Temperature is 140 DEG C~190 DEG C, and the extrusion unit processing temperature of outer layer insulation is 90 DEG C~170 DEG C；Using different processing temperature Degree so that primary insulation and outer layer insulation can reach desired high quality, so that it is good to help to reach cable product Performance requirement.
It is further that the insulated wire cores that the cross-linking radiation refers to be formed after extruded insulation pass through high energy electron beam Line irradiation makes the molecular structure of insulating materials become network molecular structure by linearity molecular structure and reach crosslinked purpose, described Crosslinking with radiation refers on high frequency high voltage electron accelerator crosslinking with radiation production line, and spoke is carried out using the total radiation dose of 13Mrad According to crosslinking；When molecular structure becomes network molecular structure by crosslinking with radiation, the high temperature strength of cable can be not only improved, The rigid nature of cable is improved, also improves stress crack resistance performance.
Be further, the stranding refer to by more by cross-linking radiations formed cores be twisted integrally, it is described into Cable pitch is 16-20 times, a diameter of φ 2-12mm of the inflaming retarding high-temperature gasket for packing, the width of the high fire-retardance glass fibre band Spend for 15-80mm；When carrying out stranding, the inflaming retarding high-temperature in high fire-retardance glass fibre band and core gap outside core is filled out Electrical property, shielding properties, fire-retardant intensity and heat-resisting ability that rope improves cable are filled, while also so that three through overshoot The core being cross-linked to form more stabilization is tightly secured together, and ensure that the stability and intensity of cable.
It is further that the thickness of the insulated metal band is more than or equal to 0.05mm, by stranding winding machine using insulation Metal tape carries out overlapping wrapped formation metal screen layer；The insulated metallic filaments be a diameter of 0.15-0.30 soft circular copper wire or Tin plating soft circular copper wire, weaves into insulated metal net by special doubling winder and high-speed knitter and carries out wrapped formation metal screen layer, 40 ° -45 ° of angle of weave, count are not less than 80%, and in braiding, it is one that 7-9 roots insulated metallic filaments, which are compiled,；The metal is exhausted Edge layer can realize interference to extraneous electromagnetic and reduce the interference of system outside electromagnetic radiation in itself, ensure that the normal of cable Work, extends the service life of cable；
It is further that the oxygen barrier layer that extrudes refers to squeeze pipe mold using half on extrusion unit, is with compression ratio 1.2:1 screw rod is by the low-smoke halide-free fireproof composite polyolefine material of oxygen index (OI) OI >=40%；Using the low cigarette of oxygen index (OI) OI >=40% Halogen-free anti-flaming polyolefin material is extruded on core, has greatly reinforced the effect of oxygen barrier, is improved cable and is suppressed propagation of flame energy Power so that product can reach the fire-retardant A classes level of bunched cables, while use compression ratio as 1.2:1 screw rod is on extrusion unit Carry out extruding oxygen barrier layer, substantially reduce the shearing force in extrusion so that extrusion is more safe and efficient, while also makes Cable structure it is even closer, outside diameter more rounding, further improves the performance of the oxygen barrier layer, ensure that each position of cable The oxygen barrier effect put.
Be further, the metal tape use thickness be 0.2~0.8mm steel band bilayer around packaging armour, the metal Silk fills armour using the steel wire or aluminium wire individual layer spiral winding of a diameter of 0.8-4mm；Complete to fill using metal tape or wire Armour step, not only can be used for protect cable, to prevent pound, press, rack cable sheath after damage core, enhance tensile strength, Compression strength, extends the service life of cable, also can protect cable interference free performance by shielding action, have preferable magnetic Shield effectiveness.
It is further that the oversheath that extrudes refers to use extruding or half tubular molding tool on extrusion unit, with compression Than for 1.2:The low-smoke halide-free fireproof composite polyolefine material of the high fire-retardance of oxygen index (OI) OI >=36% is extruded in outside lapping layer by 1 screw rod Oversheath is formed, the processing temperature for extruding oversheath is 90 DEG C~170 DEG C；The oversheath that extrudes uses oxygen index (OI) OI >=36% High fire-retardance low-smoke halide-free fireproof composite polyolefine material, and control the operating temperature of extrusion, further increase cable every Oxygen effect, substantially increases the ability that cable suppresses propagation of flame, ensure that the anti-flammability of its cable.
It is further that the oversheath step that extrudes further includes properties of product detection and finished product packing storage afterwards.
The beneficial effects of the invention are as follows：
(1) cable manufactured by the present invention has good metallic shield performance, and cable is using Radiation Crosslinked Polyethylene Primary insulation, the outer layer insulation of cross-linking radiation polyolefin, high fire-retardance glass fibre band, using low smoke halogen-free flame-retardant polyolefin material The oxygen barrier layer of material, using the oversheath of low-smoke halide-free fireproof composite polyolefine material, plus the dress sheath with shield effectiveness and use Insulated metal band carries out the insulated metal net that the braiding of wrapped or insulated metallic filaments forms, and the oversheath for having cable in arms when being laid with connects Ground, can make cable reach effective multilayer screen, it can be achieved that resisting the interference and reduction of external high and low frequency electromagnetic wave The interference of cable outside electromagnetic radiation in itself, plays its own signal transmission the function of signal dispersion, is not only ensureing cable just Normal working performance, ensures the work efficiency of cable, improves the working life of cable, decreases the radiation from cable in environment Interference, has achieveed the purpose that environmentally protective；
(2) cable produced by the present invention has stronger fire resistance, has reached A grades of levels of fire resistance, has passed through bilayer Insulating layer plus the inflaming retarding high-temperature gasket for packing of oxygen index (OI) OI >=35%, oxygen index (OI) OI >=40% low smoke halogen-free flame-retardant polyolefin every The low smoke halogen-free flame-retardant polyolefin jacket material of oxygen layer material and oxygen index (OI) OI >=36% so that be fabricated by the invention Cable realize multi-layer fire-retarded function from the inside to the outside, the transmission of temperature when reducing burning, the propagation of blocking oxygen, have compared with Strong fire resistance, while can also overcome traditional flame retardant cable and locally be not up to caused cable conflagration after flame retardant effect The problem of damage, even if partial combustion damage substantially increases cable as multi-layer fire-retarded reach stronger fire resistance Suppress the ability of propagation of flame；
(3) cable produced by the present invention has stronger heat resisting performance, using the outer layer of irradiated crosslinked polyalkene Insulation, the cross-linking radiation of insulating layer, high fire-retardance glass fibre band, inflaming retarding high-temperature gasket for packing, using low-smoke non-halogen flame-retardant polyene The oxygen barrier layer of hydrocarbon material and the oversheath using low-smoke halide-free fireproof composite polyolefine material, ensure that the high temperature resistant of cable is heat-resisting significantly Performance, plays preferable heat insulation temp effect for core, reduces the influence to core performance, extend the use of cable Service life；
(4) cable manufactured by the present invention has stronger fire resistance, using the refractory insulating layer and high resistant of mica tape Glass fibre band is fired, realizes multi-layer efficient fire resisting, may be such that cable is warm for fire for 950 DEG C -1000 DEG C in flame temperature Degree, for fiery time 90min, cooling time 15min under conditions of, still can keep the integrality of cable, ensure cable in height Remain able to work normally at fiery temperature, the burning of thermal-flame can be less than the long period；The cable is added with oxygen index (OI) at the same time The inflaming retarding high-temperature gasket for packing of OI >=35%, the low-smoke halogen-free flame-resistant polyolefin oxygen barrier material of oxygen index (OI) OI >=40% and oxygen index (OI) The low smoke halogen-free flame-retardant polyolefin jacket material of OI >=36%, also slow down the propagation of the intensity of a fire, further enhancing cable Fire resistance；
(5) material in cable produced by the present invention is environmentally protective material, is low cigarette, high fire-retardance, without stone The deleterious material such as cotton and halogen, meets the standard of ROHS, meets the requirement of environment-friendly flame retardant electric wire, manufactured cable Using the primary insulation of Radiation Crosslinked Polyethylene, using the outer layer insulation of cross-linking radiation polyolefin, high fire-retardance glass fibre band, Inflaming retarding high-temperature gasket for packing, using the oxygen barrier layer of low-smoke halide-free fireproof composite polyolefine material and using low-smoke halide-free fireproof composite polyolefine material External sheath layer all cause the cable after combustion there is no high smoke, highly toxic drawback, avoid discharging black smoke or HCL etc. Gas, reduces the discharge capacity of flue gas poison gas, reduces the release of calory burning, not only reduce the pollution to environment, also ensure that The combustibility of the cable so that the combustibility of cable reaches B1 grades of levels；
(6) construction of cable produced by the present invention is stablized, and has preferable mechanics, mechanical strength；The insulating layer of cable passes through After cross-linking radiation, the rigid nature and stress crack resistance performance of cable are improved；In stranding, it is subject between each core Inflaming retarding high-temperature gasket for packing, and the overlapping wrapped netted high fire-retardance glass fibre band outside core, improve each core it Between stability, allow each core to fit closely one entirety of formation together, improve the stretching-resisting bending-resisting intensity of cable；Every Using metal tape or wire into luggage armour outside oxygen layer, the mechanical strengths such as tension, the compression strength of cable are enhanced, while Dress sheath outside carry out again it is wrapped, not to dress sheath play the role of protection, extend dress sheath mechanical protection performance； Outer jointing jacket also further enhancing the mechanical strength of cable；
(7) for the present invention when manufacturing cable, the disposable expressing technique of extruded insulation step use, is closely extruded in conductor Surface, primary insulation use radiant crosslinked polyethylene material, ensure the electrical property of cable so that cable can guarantee that insulation at 20 DEG C 3670M Ω km as defined in resistance standard, while outer layer insulation uses irradiated crosslinked polyalkene material, not only can guarantee that cable is exhausted Edge core also can guarantee that the combustibility of cable meets that density flaming droplet/particulate class reaches d0 grades by single fire retardancy test, That is without density flaming droplet/particulate in 1200s；Ensure the outer surface rounding, smooth and ensure its section without gas of outer layer insulation at the same time Hole, not only further increases the insulation performance of extruded insulation layer so that insulating layer insulating, is fire-retardant everywhere, fire resistance ten Divide the quality and its electrical property that uniformly, ensure that cable, also so that contact, cable core and inflaming retarding high-temperature between each core are filled The contact of rope is even closer, improves the close stability of whole cable；
(8) cable manufactured by the present invention disclosure satisfy that《Design of civil buildings specification》In regulation：Super High is built Build and answer selective combustion performance B1Level and the above, production smoke toxicity are t0Level, density flaming droplet/particulate class are d0The electric wire and electricity of level Cable；Answer selective combustion performance B in the public place of first class high storey building and densely populated place1Level, production smoke toxicity are t1Level, burning drippage Thing/particulate class is d1The requirement for wanting electric wire of level.
Brief description of the drawings
Fig. 1 is the process flow chart that cable is manufactured in embodiment 1 and embodiment 3；
Fig. 2 is the process flow chart that cable is manufactured in embodiment 2.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearer, the present invention is made below in conjunction with the accompanying drawings into one Step illustrates.
Embodiment 1
A kind of low manufacture method for discharging environmentally protective shielded cable of high fire-retardance, method following steps：(1) sorting；(2) draw Silk；(3) conductor strand；(4) wrapped refractory insulating layer；(5) extruded insulation；(6) cross-linking radiation；(7) stranding；(8) metallic shield； (9) oxygen barrier layer is extruded；(10) armour is filled；(11) it is wrapped；(12) oversheath is extruded；(13) properties of product detect；(14) finished product packing Storage.
The wire drawing is to be drawn into various specifications by multiple wire-drawing dies of special wire-drawing equipment using electrician's round copper rod Circular copper monofilament, wire-drawing die can be made choice according to the specification of core.
The conductor strand refers to according to the radical that pre-establishes, rule, strand exist more circular copper monofilament to pitch Carried out on conductor wringing equipment twisted formation press into it is circular or it is non-press circular or shaping conductor, the conductor wringing equipment can Fork winch, frame winch or wire stranding machine are thought, when into column conductor process, according to specifically needing to select wringing equipment and process Specification, outermost direction of lay are left-hand.
The wrapped refractory insulating layer refers to conductor or the core of conductor strand step formation in concentric type multiple layer high speed It is wrapped 2~3 layers overlapping using mica tape on winding machine, and wrapped cap rate >=20%；The refractory insulating layer is through excess temperature 950 DEG C -1000 DEG C of flame temperature detection；It is preferred that the mica tape is two-sided synthetic mica tape, two-sided synthetic mica tape is to close It is base material into mica paper, makees two-sided supporting material with glass fabric, bonded with silicon resin adhesive have stronger resistance to Fiery performance；
The extruded insulation refers to double hyer insulation expressing technique, including primary insulation and outer layer insulation, primary insulation and outer Primary insulation and outer layer insulation are extruded in conductor thread core by layer insulation at the same time using double-deck extrusion unit using half tubular molding tool On, the outer surface rounding of the outer layer insulation, smooth and section pore-free；The primary insulation uses Radiation Crosslinked Polyethylene material Material, the outer layer insulation use cross-linking radiation polyolefine material, and the thickness of the extruded insulation layer is 0.6mm, and the internal layer is exhausted The thickness of edge layer is 0.2mm, and the thickness of the outer insulation is 0.4mm；The extrusion unit processing temperature of the primary insulation For 140 DEG C~190 DEG C, the extrusion unit processing temperature of outer layer insulation is 90 DEG C~170 DEG C；Extrusion linear speed is 10-20m/ Min, can meet that cable insulation resistance at 20 DEG C meets 3670M Ω as defined in standard by cable made from this production technology Km, combustibility meet that density flaming droplet/particulate class reaches d0Level, i.e. 1200s are interior without density flaming droplet/particulate.
The insulated wire cores that the cross-linking radiation refers to be formed after extruded insulation are made absolutely by high-power electron beam radiation exposure The molecular structure of edge material becomes network molecular structure by linearity molecular structure and reaches crosslinked purpose, and the crosslinking with radiation is Refer on high frequency high voltage electron accelerator crosslinking with radiation production line, cross-linking radiation is carried out using the total radiation dose of 13Mrad.
The stranding refers to be twisted the insulated wire cores after three cross-linking radiations according to the direction that pre-establishes, pitch Close, the pitch of the stranding is 16-20 times, and is subject to the inflaming retarding high-temperature filling of a diameter of φ 8-10mm between core gap Rope, oxygen index (OI) OI >=35% of the inflaming retarding high-temperature gasket for packing, fusing point >=260 DEG C, the overlapping wrapped netted high resistant outside core Combustion glass fibre band makes a plurality of insulated core become the close core entirety of a rounding, the high fire-retardance glass fibre band Width be 15-20mm.
When carrying out wrapped with insulated metal band, the thickness of the insulated metal band is more than or equal to 0.05mm, passes through stranding Winding machine carries out overlapping wrapped shielding using insulated metal band；When being woven with insulated metallic filaments, the insulated metallic filaments Soft circular copper wire or tin plating soft circular copper wire for a diameter of 0.15-0.30, are woven into absolutely by special doubling winder and high-speed knitter Edge metal mesh forms insulating metal layer, 40 ° -45 ° of angle of weave, and count is not less than 80%, and in braiding, 7-9 thoroughly does away with edge It is one that wire, which is compiled,；The metal dielectric layer has the ability that can resist extraneous electromagnetic interference and system outside radiation electric in itself The ability of magnetic disturbance, ensure that the normal work of cable, extend the service life of cable；
The oxygen barrier layer that extrudes refers to squeeze pipe mold using half on extrusion unit, is 1.2 with compression ratio:1 screw rod will The low-smoke halide-free fireproof composite polyolefine material of oxygen index (OI) OI >=40% is extruded on metal screen layer.Can play in this way every Oxygen acts on, and greatly improves cable and suppresses propagation of flame ability, and it is horizontal to reach the fire-retardant A classes of bunched cables.
The dress armour, which refers to be spirally wound on outside oxygen barrier layer using the double-deck wrapped or wire individual layer of metal tape, forms dress armour Layer, to improve the mechanical protection ability of cable；The metal tape use thickness for 0.2~0.8mm steel band bilayer around packaging armour, The wire fills armour using the steel wire or aluminium wire individual layer spiral winding of a diameter of 0.8-4mm.
It is described it is wrapped refer to filling wrapped 1~2 layer outside triumphant layer of combustion-proof glass fiber band, not only can guarantee that the resistance of cable Performance, smoke density experimental performance are fired, while can also buffer dress sheath mechanical stress caused by oversheath, avoids oversheath from occurring The phenomenon of stress cracking.
The oversheath that extrudes refers to extruding or half tubular molding tool on extrusion unit, is 1.2 with compression ratio:1 The low-smoke halide-free fireproof composite polyolefine material of the high fire-retardance of oxygen index (OI) OI >=36% is extruded in outside lapping layer and forms oversheath by screw rod, The processing temperature for extruding oversheath is 90 DEG C~170 DEG C.
Properties of product detection is mainly combustibility in addition to conventional electric property, mechanical and physical performance, fire resistance Examination.
By the cable manufactured by embodiment 1, meet《Design of civil buildings specification》In regulation：High-rise building Answer selective combustion performance B1Level and the above, production smoke toxicity are t0Level, density flaming droplet/particulate class are d0The electric wire and cable of level； Answer selective combustion performance B in the public place of first class high storey building and densely populated place1Level, production smoke toxicity are t1Level, density flaming droplet/ Particulate class is d1The requirement for wanting electric wire of level.
When the cable is carried out shielding properties test experience, the cable in embodiment 1 is placed on the stronger ring of electromagnetic signal Tested in border, allow external sheath layer to be grounded, can be detected, even the cable in the stronger environment of electromagnetic signal, Can normally it be worked, and the ability of cable transmission signal will not weaken, when measuring cable and entering the electromagnetic signal environment It is relatively low with signal errors value when going out electromagnetic signal environment, draw the cable almost no signal in the stronger environment of electromagnetic signal Loss.Therefore, which has stronger metallic shield performance.
Cable in embodiment 1 is supplied into fire 90min at a temperature of flame temperature is 950 DEG C -1000 DEG C, is then cooled down again After 15min, which remains to keep the normal operation of certain time, and has no effect on its use quality, therefore in embodiment 1 Cable there is preferable fire resistance.
After the cable in embodiment 1 carries out combustion test, each burning data in the cable is detected, is surveyed Obtain the cable its propagation of flame FS ≈ 0.86m in burning；Heat release rate peak value HRR peak value ≈ 21.5kW；By in fiery 1200s Hot total volume THR1200≈10.7MJ；Fire growth rate index FIGRA ≈ 124W/s；Produce cigarette speed peak value SPR peak values About 0.18m2/s；By the production cigarette total amount TSP in fiery 1200s1200≈38.4m2, therefore the combustibility of the cable in embodiment 1 B is reached1Level.
When nonmetallic materials in the cable are 7L/m, for 40 minutes fiery in combustion test, after cable fire stops, wiping Dry sample, it is about 1.9m to measure maximum charing scope, is less than blowtorch bottom 2.5m, therefore the fire resistance of the cable reaches A grades horizontal.
In the combustion test of cable in embodiment 1, caused smoke density >=18.2mg/L during burning is detected, i.e., The production smoke toxicity classification of risks of the cable can reach quasi- safe level (ZA2), therefore the flue gas toxity of the cable reaches t0Level.
Cable in embodiment 1 detects observation when metal burning is tested and show that the cable is just fired in 1480s Burn dropping/particulate to fall, meet the condition that cable falls in burning 1200s without density flaming droplet/particulate, therefore the cable Density flaming droplet/particulate class reach d0Level.
When the cable in embodiment 1 carries out corrosive grade detection, it is about 1.9 μ s/mm to measure its electrical conductivity, pH value ≈ 5.6, so the corrosive grade of the cable in embodiment 1 has reached a1Level is horizontal.
Embodiment 2
In example 2, the method and step for manufacturing cable is as follows：(1) sorting；(2) wire drawing；(3) conductor；(4) it is wrapped resistance to Fiery insulating layer；(5) extruded insulation；(6) cross-linking radiation；(7) stranding；(8) metallic shield；(9) oxygen barrier layer is extruded；(10) armour is filled； (11) it is wrapped；(12) oversheath is extruded；(13) properties of product detect；(14) finished product packing is put in storage, and the conductor in embodiment 1 is twisted Close step and be changed to conductor step, the conductor step refers to circular copper monofilament the leading directly as product for forming drawing step Body, changes into 0.7mm by extruded insulation layer gross thickness, the thickness of primary insulation is changed to 0.2mm, the thickness of outer layer insulation is changed For 0.5mm, the extrusion linear speed of insulating layer is changed to 80-100m/min, the diameter of inflaming retarding high-temperature gasket for packing is changed to φ 2- 4mm, 16-20 times is changed to by the twisting pitch of stranding step, and the thickness of combustion-proof glass fiber band is changed to 15-40mm, fills armour During metal tape thickness be changed to 0.2mm or metal tape diameter is changed to 0.8-1.25mm.
Using the cable manufactured by the method in embodiment 2, meet《Design of civil buildings specification》In regulation：It is super Skyscraper answers selective combustion performance B1Level and the above, production smoke toxicity are t0Level, density flaming droplet/particulate class are d0The electricity of level Line and cable；Answer selective combustion performance B in the public place of first class high storey building and densely populated place1Level, production smoke toxicity are t1Level, combustion Burning dropping/particulate class is d1The requirement for wanting electric wire of level.
When the cable is carried out shielding properties test experience, the cable in embodiment 2 is placed into the stronger ring of electromagnetic signal Tested in border, allow external sheath layer to be grounded, can be detected, even the cable in the stronger environment of electromagnetic signal, Can normally it be worked, and the ability of cable transmission signal will not weaken, when measuring cable and entering the electromagnetic signal environment Relatively low with signal errors value when going out electromagnetic signal environment, which is not in signal in the stronger environment of electromagnetic signal The situation of loss.Therefore, which has stronger metallic shield performance.
Cable in embodiment 2 is supplied into fire 90min at a temperature of flame temperature is 950 DEG C -1000 DEG C, is then cooled down again After 15min, which remains to keep the normal operation of certain time, and has no effect on its use quality, therefore in embodiment 2 Cable there is preferable fire resistance.
After the cable in embodiment 2 carries out combustion test, each burning data in the cable is detected, is surveyed Obtain the cable its propagation of flame FS ≈ 1.05m in burning；Heat release rate peak value HRR peak values are approximately equal to 23kW；By fiery 1200s Interior hot total volume THR1200About 11MJ；Fire growth rate index FIGRA ≈ 131W/s；Produce cigarette speed peak value SPR peaks Value ≈ 0.19m2/s；By the production cigarette total amount TSP in fiery 1200s1200≤41m2, therefore the combustibility of the cable in embodiment 2 reaches B is arrived1Level.
When nonmetallic materials in the cable are 7L/m, for 40 minutes fiery in combustion test, after cable fire stops, wiping Dry sample, it is about 1.98m to measure maximum charing scope, and less than blowtorch bottom 2.5m, therefore the fire resistance of the cable reaches A Level.
In the combustion test of cable in example 2, detect that caused smoke density is about 16.4mg/L during burning, That is the production smoke toxicity classification of risks of the cable can reach quasi- safe level (ZA2), therefore the flue gas toxity of the cable reaches t0Level.
Cable in embodiment 2 detects observation when metal burning is tested and draws, which starts when burning 1350s There is density flaming droplet/particulate to fall, meet the regulation that the cable falls in burning 1200s without density flaming droplet/particulate, because Density flaming droplet/particulate class of this cable reaches d0Level.
When the cable in embodiment 2 carries out corrosive grade detection, 2.15 μ s/mm of its electrical conductivity ≈, and PH are measured Value about 5.4, so the corrosive grade of the cable in embodiment 2 reaches a1Level.
Embodiment 3
In embodiment 3, the method for manufacturing cable is consistent with the method and step that cable is manufactured in embodiment 1, by embodiment 1 In extruded insulation layer gross thickness change into 1.0mm, the thickness of primary insulation is changed to 0.3mm, the thickness of outer layer insulation is changed For 0.7mm, the extrusion linear speed of insulating layer is changed to 5-7m/min, the thickness of combustion-proof glass fiber band is changed to 60-80mm, The twisting pitch of stranding step is changed to 20 times, fills that the metal tape thickness during armour is changed to 0.2mm or metal tape diameter changes For 1.25mm.
By the cable manufactured by embodiment 3, also meet《Design of civil buildings specification》In regulation：Super High is built Build and answer selective combustion performance B1Level and the above, production smoke toxicity are t0Level, density flaming droplet/particulate class are d0The electric wire and electricity of level Cable；Answer selective combustion performance B in the public place of first class high storey building and densely populated place1Level, production smoke toxicity are t1Level, burning drippage Thing/particulate class is d1The requirement for wanting electric wire of level.
When the cable is carried out shielding properties test experience, the cable in embodiment 3 is placed into the stronger ring of electromagnetic signal Tested in border, allow external sheath layer to be grounded, can be detected, even the cable in the stronger environment of electromagnetic signal, Can normally it be worked, and the ability of cable transmission signal will not weaken, when measuring cable and entering the electromagnetic signal environment It is relatively low with signal errors value when going out electromagnetic signal environment.Therefore, which has stronger metallic shield performance.
Cable in embodiment 3 is supplied into fire 90min at a temperature of flame temperature is 950 DEG C -1000 DEG C, is then cooled down again After 15min, which remains to keep the normal operation of certain time, and has no effect on its use quality, therefore in embodiment 3 Cable there is preferable fire resistance.
After the cable in embodiment 3 carries out combustion test, each burning data in the cable is detected, is surveyed Obtain the cable its propagation of flame FS ≈ 0.8m in burning；Heat release rate peak value HRR peak values are about 20kW；By in fiery 1200s Hot total volume THR1200≈9MJ；Fire growth rate index FIGRA ≈ 118W/s；Producing cigarette speed peak value SPR peak values is about 0.16m2/s；By the production cigarette total amount TSP in fiery 1200s1200≈36.5m2, therefore the combustibility of the cable in embodiment 3 reaches B1Level.
When nonmetallic materials in the cable are 7L/m, for 40 minutes fiery in combustion test, after cable fire stops, wiping Dry sample, it is about 1.82m to measure maximum charing scope, meets the condition less than blowtorch bottom 2.5m, therefore the cable is fire-retardant Performance reaches A grades.
In the combustion test of cable in embodiment 3, caused smoke density >=19.5mg/L during burning is detected, i.e., The production smoke toxicity classification of risks of the cable can reach quasi- safe level (ZA2), therefore the flue gas toxity of the cable reaches t0Level.
Cable in embodiment 3 detects observation when metal burning is tested and draws, which starts when burning is to 1510s There is density flaming droplet/particulate and fall phenomenon, meet the condition that cable falls in burning 1200s without density flaming droplet/particulate, Therefore density flaming droplet/particulate class of the cable reaches d0Level.
When the cable in embodiment 3 carries out corrosive grade detection, 1.76 μ s/mm of its electrical conductivity ≈, and PH are measured Value ≈ 6.2, so the corrosive grade of the cable in embodiment 3 reaches a1Level.
The basic principles, main features and the advantages of the invention have been shown and described above.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its Equivalent thereof.

Claims (10)

  1. A kind of 1. low manufacture method for discharging environmentally protective shielded cable of high fire-retardance, it is characterised in that：This method includes following step Suddenly：(1) conductor or conductor strand；(2) wrapped refractory insulating layer；(3) extruded insulation；(4) cross-linking radiation；(5) stranding；(6) it is golden Belong to shielding；(7) oxygen barrier layer is extruded；(8) armour is filled；(9) it is wrapped；(10) oversheath is extruded；
    The wrapped refractory insulating layer refers to the core of conductor or the formation of conductor strand step is wrapped in concentric type multiple layer high speed It is wrapped 2~3 layers overlapping using mica tape on machine, and wrapped cap rate >=20%；The refractory insulating layer is 950 through excess temperature DEG C -1000 DEG C of flame temperature detection；
    The extruded insulation refers to double hyer insulation expressing technique, including primary insulation and outer layer insulation, and primary insulation and outer layer are exhausted Primary insulation and outer layer insulation are extruded on conductor thread core by edge at the same time using double-deck extrusion unit using half tubular molding tool, institute State the outer surface rounding of outer layer insulation, smooth and section pore-free；The primary insulation uses Radiation Crosslinked Polyethylene material, institute State outer layer insulation and use cross-linking radiation polyolefine material；
    The stranding refers to the insulated wire cores after more cross-linking radiations being twisted, and is subject to fire-retardant height between core gap Warm gasket for packing, oxygen index (OI) OI >=35% of the inflaming retarding high-temperature gasket for packing, fusing point >=260 DEG C are overlapping wrapped netted outside core High fire-retardance glass fibre band a plurality of insulated core is become the close core of a rounding overall；
    The metallic shield refers to after stranding in outer layer of cable core lapped insulation metal tape or wrapped is compiled by insulated metallic filaments The insulated metal net knitted；
    The oxygen barrier layer that extrudes refers to that the low-smoke halide-free fireproof composite polyolefine material of the extrusion high fire-retardance on extruding machine is extruded in metal On shielded layer, oxygen index (OI) OI >=40% of the low-smoke halide-free fireproof composite polyolefine material of the high fire-retardance；
    The dress armour, which refers to be spirally wound on outside oxygen barrier layer using the double-deck wrapped or wire individual layer of metal tape, forms dress sheath；
    It is described it is wrapped refer to dress sheath outside wrapped 1-2 floor heights combustion-proof glass fiber band；
    The oversheath refers to the low-smoke halide-free fireproof composite polyolefine material that high fire-retardance is extruded on extruding machine, and the high fire-retardance is low Oxygen index (OI) OI >=36% of cigarette halogen-free anti-flaming polyolefin material.
  2. 2. the low manufacture method for discharging environmentally protective shielded cable of high fire-retardance according to claim 1, it is characterised in that：Institute Sorting and wire drawing are further included before stating conductor or conductor strand step；The wire drawing is to be set using electrician's round copper rod by special wire drawing Standby multiple wire-drawing dies are drawn into the circular copper monofilament of various specifications.
  3. 3. the low manufacture method for discharging environmentally protective shielded cable of high fire-retardance according to claim 1, it is characterised in that：Institute State conductor refer to by drawing step formed circular copper monofilament directly as product conductor；The conductor strand refers to more Circular copper monofilament presses according to the radical that pre-establishes, rule, strand to twisted formation is carried out on conductor wringing equipment with pitch Into it is circular or it is non-press circular or shaping conductor, outermost direction of lay is left-hand.
  4. 4. the low manufacture method for discharging environmentally protective shielded cable of high fire-retardance according to claim 1, it is characterised in that：Institute The thickness for stating extruded insulation layer is 0.6-1.0mm, and the thickness of the inner insulation layer is 0.2-0.3mm, the outer insulation Thickness be 0.4-0.7mm；The extrusion unit processing temperature of the primary insulation is 140 DEG C~190 DEG C, the extrusion of outer layer insulation Unit processing temperature is 90 DEG C~170 DEG C.
  5. 5. the low manufacture method for discharging environmentally protective shielded cable of high fire-retardance according to claim 1, it is characterised in that：Institute Stating the insulated wire cores that cross-linking radiation refers to be formed after extruded insulation makes point of insulating materials by high-power electron beam radiation exposure Minor structure becomes network molecular structure by linearity molecular structure and reaches crosslinked purpose, and the crosslinking with radiation refers in high frequency height On the sub- radiation from machine cross-linking production line of piezoelectricity, cross-linking radiation is carried out using the total radiation dose of 8-13Mrad.
  6. 6. the low manufacture method for discharging environmentally protective shielded cable of high fire-retardance according to claim 1, it is characterised in that：Institute State stranding to refer to the more cores formed by cross-linking radiation being twisted integrally, the pitch of the stranding is 16-20 times, described A diameter of φ 2-12mm of inflaming retarding high-temperature gasket for packing, the width of the high fire-retardance glass fibre band is 15-80mm.
  7. 7. the low manufacture method for discharging environmentally protective shielded cable of high fire-retardance according to claim 1, it is characterised in that：Institute The thickness for stating insulated metal band is more than or equal to 0.05mm, and overlapping wrapped formation is carried out using insulated metal band by stranding winding machine Metal screen layer；The insulated metallic filaments be a diameter of 0.15-0.30 soft circular copper wire or tin plating soft circular copper wire, by it is special simultaneously Silk machine and high-speed knitter weave into insulated metal net and carry out wrapped formation metal screen layer, 40 ° -45 ° of angle of weave, count Not less than 80%, in braiding, it is one that 7-9 roots insulated metallic filaments, which are compiled,.
  8. 8. the low manufacture method for discharging environmentally protective shielded cable of high fire-retardance according to claim 1：It is characterized in that：Institute State and extrude oxygen barrier layer and refer to squeeze pipe mold using half on extrusion unit, be 1.2 with compression ratio:1 screw rod by oxygen index (OI) OI >= 40% low-smoke halide-free fireproof composite polyolefine material.
  9. 9. the low manufacture method for discharging environmentally protective shielded cable of high fire-retardance according to claim 1, it is characterised in that：Institute Stating metal tape uses thickness double-deck wrapped into luggage armour for the steel band of 0.2~0.8mm；The wire uses a diameter of 0.8- The steel wire or aluminium wire individual layer spiral winding of 4mm is into luggage armour.
  10. 10. the low manufacture method for discharging environmentally protective shielded cable of high fire-retardance according to claim 1, it is characterised in that： The oversheath that extrudes refers to extruding or half tubular molding tool on extrusion unit, is 1.2 with compression ratio:1 screw rod is by oxygen The low-smoke halide-free fireproof composite polyolefine material of the high fire-retardance of index OI >=36% is extruded in outside lapping layer and forms oversheath, extrudes outer shield The processing temperature of set is 90 DEG C~170 DEG C.
CN201711232920.6A 2017-11-30 2017-11-30 A kind of low manufacture method for discharging environmentally protective shielded cable of high fire-retardance Pending CN107993770A (en)

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CN109448921A (en) * 2018-11-19 2019-03-08 尚纬股份有限公司 A kind of manufacturing method of inorganic fire medium and high voltage cable
CN109461542A (en) * 2018-11-06 2019-03-12 安徽华宇电缆集团有限公司 A kind of low-smoke zero-halogen low-toxicity public safety fireproof cable manufacturing method
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CN111724940A (en) * 2020-06-23 2020-09-29 浦大电缆集团有限公司 Manufacturing process of mica tape mineral insulation flexible cable
CN111724949A (en) * 2020-06-23 2020-09-29 浦大电缆集团有限公司 Manufacturing process of extruded insulation fire-resistant power cable
CN111724945A (en) * 2020-06-23 2020-09-29 浦大电缆集团有限公司 Manufacturing method of environment-friendly insulated cable
CN114005610A (en) * 2021-10-25 2022-02-01 江苏上上电缆集团有限公司 Manufacturing method of control cable applicable to subway flame-retardant grade

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CN111724945A (en) * 2020-06-23 2020-09-29 浦大电缆集团有限公司 Manufacturing method of environment-friendly insulated cable
CN114005610A (en) * 2021-10-25 2022-02-01 江苏上上电缆集团有限公司 Manufacturing method of control cable applicable to subway flame-retardant grade
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Application publication date: 20180504