CN204516405U - A kind of light flexible low-smoke zero-halogen fire-resistant low-voltage ship cable - Google Patents

A kind of light flexible low-smoke zero-halogen fire-resistant low-voltage ship cable Download PDF

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CN204516405U
CN204516405U CN201520154098.6U CN201520154098U CN204516405U CN 204516405 U CN204516405 U CN 204516405U CN 201520154098 U CN201520154098 U CN 201520154098U CN 204516405 U CN204516405 U CN 204516405U
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low
fire
cable
halogen
smoke
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王志荣
解向前
倪伟
李嵘
卢军军
沈阳阳
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ZHONGTIAN TECHNOLOGY EQUIPMENT CABLE Co Ltd
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ZHONGTIAN TECHNOLOGY EQUIPMENT CABLE Co Ltd
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Abstract

The utility model discloses a kind of light flexible low-smoke zero-halogen fire-resistant low-voltage ship cable, comprise zinc-plated flexible conductor, Ceramic silicon rubber insulating barrier, low-smoke non-halogen flame-retardant packing material, low smoke and zero halogen belting layer, low-smoke non-halogen flame-retardant separation sleeve, metal base transistor screen and low-smoke non-halogen flame-retardant protective sleeve.Cable in the utility model possesses heat insulation, little, the low cigarette of fire insulation, water proof, antidetonation, thermal weight loss, Halogen, the advantage such as fire-retardant.The stiff shell that insulating barrier becomes in case of fire can play the effect of well fire-retardant, fire-resistant, fire prevention, fire insulation, effective guarantee circuit unimpeded.Product has softness, volume is little, lightweight, mechanical performance, excellent electrical property, to meet in boats and ships complicated to lay environment, effectively can save hull space and reduce the light weight of boats and ships, improve the cargo dead-weight of boats and ships.

Description

A kind of light flexible low-smoke zero-halogen fire-resistant low-voltage ship cable
Technical field
The utility model is specifically related to a kind of light flexible low-smoke zero-halogen fire-resistant shipboard cable, for boats and ships and ocean engineering provide, there is softness, volume is little, lightweight, the fire-resisting cable of mechanical performance, excellent electrical property grade of rated voltage 0.6/1kV and the occasion such as following delivery of electrical energy, circuit illumination.
Background technology
Boats and ships are in extremely important status in five big traffic means of transportation, because water-borne transport ability is maximum, in Changjiang River Trunk Line, the carrying capacity of a barge or pusher barge team is more than ten thousand tons, the carrying capacity of pusher barge team maximum abroad reaches 3 ~ 40,000 tons, and oil carrier maximum is in the world more than 500,000 tons; Transport by sea accounts for unique critical role in China's foreign trade, China has the foreign trade cargo more than 90% to adopt transport by sea, be the powerful pillar developed international trade, wartime can strengthen national defence ability again, and this is that other any means of transportation all cannot replace.
On boats and ships, cable is the same with nerve as the blood vessel of people, spread all over the whole body of boats and ships, be responsible for power supply, the effect of signal controlling and liaison, but be also the arch-criminal of " second time disaster " simultaneously, when boats and ships breaking out of fire, a large amount of toxic gases and dense smog can be discharged by the general shipboard cable ignited, not only corrode instrumentation devices, equipment is caused to paralyse, more can make personnel on boats and ships and cause poisoning even dead because suck flue gas, if narrow and small, in the space closed, cable is ignited, then can oxygen rapidly in drain space, produce poison gas to make personnel anoxia asphyxia is poisoning and die at once.According to interrelated data introduction, in the fire incident that boats and ships cause due to electric fault, the smog produced due to cable fire and poison gas cause very most of casualties and the paralysis of boats and ships instrumentation devices, thus cause boats and ships out of hand, and then cause Ship's Sinking.China's ship universal regulation and stipulation must be fire-resisting cable at boats and ships at the service cable of the systems such as fire detecting and alarm, fire-fighting system, steering control system, emergency lighting, wired broadcasting, to ensure that ship fire improves existence and self-saving ability after occurring within the effective time.
Due to the release of fire-resisting cable new standard peculiar to vessel, higher requirement has been had for fire resistance, according in newest standards IEC60331-1:2009 or IEC60331-2:2009, fire-resisting cable is required that 830 DEG C are carried out flameproofed impact-resistance requirement, fire resistance for cable has had higher requirement, in order to meet the fire resistant requirements of cable, the current domestic fire resistance adopting the thickness increasing magnesium oxide mineral insulation and mica tape to meet cable, therefore the external diameter that result in cable becomes large, weight increases, cable bend poor performance, cost increase.
At present, what adopt both at home and abroad is magnesium oxide mineral fire-proof insulation cable and Mica tape fire-resisting cable mostly.Magnesium oxide mineral fireproof cable needs special manufacturing and processing equipment due to the cable of this structure, and the equipment in addition producing magnesium oxide mineral fire-proof insulation cable not only needs import, and very expensive, and fund input is too large; In addition, the outer jacket of magnesium oxide mineral fire-proof insulation cable is all-metal construction, higher in cost, in border application aspect by restriction to a certain extent; Add the particular/special requirement of metallic sheath magnesium oxide mineral fire-proof insulation cable in the process such as laying installation and use of production and processing, transport, circuit, production and processing as magnesium oxide mineral fire-proof insulation cable can not be convenient image height molecular material, be difficult to lay in the cabin of narrow and small complexity, cost of raw material cost is high, be difficult to universal on a large scale use, be difficult to especially promote on ship for civil use.And the fire-resisting cable that mica tape is wound around, need multi-lay winding in process of production, due to the restriction of process conditions, overlapping the slot place is often easily caused to occur defect, mica tape embrittlement after burning, easily come off, also cause fire-resistant weak effect, thus be difficult to ensure communication, electric power in case of fire safe and smooth.
Utility model content
Utility model object: in order to solve the deficiencies in the prior art, the utility model provides a kind of light flexible low-smoke zero-halogen fire-resistant low-voltage ship cable and technological process thereof.
Technical scheme: a kind of light flexible low-smoke zero-halogen fire-resistant low-voltage ship cable, comprise the low smoke and zero halogen belting layer arranged from inside to outside, low-smoke non-halogen flame-retardant separation sleeve, metal base transistor screen and low-smoke non-halogen flame-retardant protective sleeve, some Ceramic silicon rubber insulated wire cores and low-smoke non-halogen flame-retardant packing material is provided with in described low smoke and zero halogen belting layer, described Ceramic silicon rubber insulated wire cores comprises zinc-plated flexible conductor and is wrapped in the outer field Ceramic silicon rubber insulating barrier of zinc-plated flexible conductor, described zinc-plated flexible conductor carries out current delivery, described zinc-plated flexible conductor is produced by tin plating technique, improve conductors against oxidation, decay resistance, conductor adopts the 5th kind of flexible conductor simultaneously, reduces the bending radius of cable, meets cabin narrow space and lay, described Ceramic silicon rubber insulating barrier, and its 20 DEG C insulation specific insulations are 2 × 10 15Ω .cm.Fire resistance rating meets the CWZ level Water spray of IEC60331-1:2009 and above and BS 6387, vibrations, fire resistance test.There is fire-resistant, low cigarette, halogen-free flameproof, eliminate fire-resisting cable flame retardant coating part, effectively reduce the external diameter of cable, reduce the weight of cable, described metal base transistor screen is tinned copper wire shielding, tinned copper wire count >=90%, monofilament external diameter is not less than 0.2mm.For the transmission preventing the induced current in core from affecting electric energy, cause power supply shakiness or electric power system paralysis, also can play good mechanical protection effect, and ensure that the excellent bending performance of cable.
As optimization: band uses low-smoke non-halogen flame-retardant band, fill and use low-smoke non-halogen flame-retardant gasket for packing, ensure that the low cigarette of cable, Halogen and fire resistance, improve the roundness of cable.
As optimization: separator cover is for extruding type low-smoke halogen-free flame-retardant thermoplastic polyolefine material, and this material ensure that cable has low cigarette, Halogen, the performance such as fire-retardant, anticorrosive and aging, provides safety guarantee by the operation for boats and ships.
As optimization: described protective sleeve is for for extruding type low-smoke halogen-free flame-retardant thermoplastic polyolefine material, and cable has low cigarette, Halogen, fire-retardant, anti-external corrosion and the performance such as aging concurrently, provides safety guarantee by the operation for boats and ships.
Beneficial effect: the cable in the utility model can meet the scope of application of rated voltage 0.6/1kV and following fire-resistant low-voltage cable peculiar to vessel.Mainly:
1. be converted into inorganic ceramic material when running into high temperature, this ceramic material has possessed the advantages such as ceramic insulation, heat insulation, fire insulation, water proof, antidetonation, thermal weight loss are little.650 DEG C ~ 3000 DEG C have flame or nonflame condition under can form the housing of ceramic-like, the effect of well fire-retardant, fire-resistant, fire prevention, fire insulation can be played, effective guarantee circuit unimpeded.The fireproof electric wire cable produced, fire resistance rating meets IEC60331-1:2009 and above (burning 90 minutes in 1200 DEG C of flames, 3A fuse does not fuse) flameproofed impact-resistance requirement, also test by the CWZ highest level of Britain BS6387 that (C---burns 3 hours in 950 DEG C of flame; W---Water spray; Z---shakes), improve fire resistance rating.Flue gas after burning---low cigarette, Halogen, without phosphorus nitrogen, heavy metal free, low toxicity, without asbestos, flue gas toxity level of security reach macromolecular material the highest level of security ZA1 level (animal used as test within 30 minutes contamination phases and after in 3 days not dead and average weight recover), secondary injury can not be caused to people, environmental protection standard meets RoHS standard, without asbestos require meet International Maritime Organization MSC.282(86) resolution.
2. under normal temperature, Ceramic silicon rubber keeps all characteristics, softness, the Cable Bending Radius little (minimum bending radius can reach 4D) of silicon rubber, external diameter is little, lightweight, mechanical performance, excellent electrical property, to meet in boats and ships and complicated lay environment, weight minimizing 20% compared with routine fire-resisting cable peculiar to vessel, reduction 14% compared with routine fire-resisting cable external diameter peculiar to vessel, effectively can save the light weight of hull space and reduction boats and ships, improve the cargo dead-weight of boats and ships.
3. Ceramic silicon rubber cable is without the need to wrapped flame retardant coating, and an extrusion molding, simplifies production process, improve production efficiency, reduce production cost.According to Mica tape maximum speed, every day maximum wrapped 4km flame retardant coating, and then extrude insulating barrier, and adopt Ceramic silicon rubber can reduce wrapped flame retardant coating operation as insulating barrier, according to production every day insulated wire cores 30km, fire-resisting cable peculiar to vessel adopts Ceramic silicon rubber insulation can shift to an earlier date 7.5 days and has produced.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is process flow diagram of the present utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is described in further detail.
Embodiment
As shown in Figure 1; a kind of light flexible low-smoke zero-halogen fire-resistant low-voltage ship cable; comprise the low smoke and zero halogen belting layer 4, low-smoke non-halogen flame-retardant separation sleeve 5, metal base transistor screen 6 and the low-smoke non-halogen flame-retardant protective sleeve 7 that arrange from inside to outside; some Ceramic silicon rubber insulated wire cores and low-smoke non-halogen flame-retardant packing material 3 is provided with in low smoke and zero halogen belting layer 4; Ceramic silicon rubber insulated wire cores comprises zinc-plated flexible conductor 1 and is wrapped in the outer field Ceramic silicon rubber insulating barrier 2 of zinc-plated flexible conductor 1, and zinc-plated flexible conductor 1 carries out current delivery.
Zinc-plated flexible conductor 1 is produced by tin plating technique, improves conductors against oxidation, decay resistance.Conductor meets GB/T 3956-2008 the 5th kind of zinc-plated flexible conductor simultaneously, effectively reduces the bending radius of cable.
Ceramic silicon rubber insulating barrier 2, under super-clean environment, Ceramic silicon rubber is produced connecting on sulphur extrusion equipment, and use screw diameter is ψ 65mm ~ ψ 90mm, avoid the intrusion because of impurity and aqueous vapor and cause electric branch, water tree phenomenon generation; In production process, body temperature controls to control between 5 DEG C ~ 25 DEG C in temperature, and prevent temperature too high, Ceramic silicon rubber shifts to an earlier date sulfuration; Curingprocess rate and pressure should according to T 90cure time determines concrete curingprocess rate and pressure, and after guaranteeing sulfuration, material property meets shipboard cable insulation property index request; According to the judgement of aging procedure and result of the test in GB/T 11026.1-2003 " cable insulation material thermal endurance " standard, after the life end point of 180 DEG C, 165 DEG C, 150 DEG C and 135 DEG C, adopt Allan Ni Wuzi curvilinear equation to calculate by collecting cable, deriving the thermal life of this insulating material when cable long-time running serviceability temperature 90 DEG C is greater than 30 years.
Low-smoke non-halogen flame-retardant packing material 3 and low smoke and zero halogen belting layer 4: low-smoke non-halogen flame-retardant gasket for packing selected by packing material, ensure that the core stranding rounding of cable, core is closely knit; Stranding band uses low smoke and zero halogen band to tighten, and ensure that the low smoke and zero halogen performance of cable; Keep in process of production every root core by torsion and even tension controlled, prevent core tension force uneven, core is beaten and is turned round, conductor drawing-down.
Separation sleeve and oversheath are extruded: separation sleeve and oversheath operation use that screw diameter is ψ 70mm ~ ψ 150mm, temperature accuracy control ± 3 DEG C, draw ratio is 20 ~ 25, compression ratio is 1.2 ~ 1.5 plastic extruding machine produces, cable separation sleeve effectively prevents braiding armour burr insulation-piercing core, ensure the electric property of cable, material homogeneity, compactness are extruded in outside cable core or armour, and cable separation sleeve and oversheath stand the Spark plug optical fiber sensor that GB/T 3048.10-2007 specifies;
Metal base transistor screen 6 uses braiding machine to carry out braiding armouring outside cable separation sleeve, adopts braid shielded armouring mode, makes tinned copper wire be interweaved with certain rule and cover on the cable core of cable, and becomes that one deck is protected closely, screen.This braid shielded armour can play shielding aspect for cable and prevent electromagnetic interference, eliminates the induced potential of cable surface; good ground protection; play the effect of protection facility and personal security; also good mechanical protection effect can be played; can resist in the process of laying and pull; and ensure that the excellent bending performance of cable, thus ensure that product does not rupture under alternating bending or long-term minimum bending radius service condition.
As shown in Figure 2, a kind of light flexible low-smoke zero-halogen fire-resistant shipboard cable and technological process thereof, comprise wire drawing, annealing, synnema, multiple strand and insulating exruded, continuous vulcanization, stranding, separation sleeve extrude, weave armouring and oversheath extrudes totally 10 operations, wherein, insulation operation is critical process, and annealing, insulating exruded and continuous vulcanization are special procedure.
The copper bar of Ф 1.2mm is adopted to produce the monofilament to Ф 0.1mm by the most I of the wire-drawing die of gradual-change bore diameter in small wire drawing machine.
In the annealed stove of monofilament after the high temperature of 580 DEG C ~ 600 DEG C, cause broken lattice to be reassembled arrangement by wire drawing in monofilament, improve the pliability of copper monofilament.Annealing monofilament is online by the tin stove of 380 DEG C ~ 400 DEG C, and after the eye mould sizing of tin stove end, the tin layers of fusing evenly can be coated in conductive surface, plays the effect of oxidation-resistant corrosion-resistant.The index request that the zinc-plated rear elongation at break of annealing is not less than 30% is proposed to conductor monofilament, improves the processing characteristics of conductor.
It is 0.5mm that cable conductor is twisted by many zinc-plated filament tows 2~ 16mm 2conductor element after reestablish diplomatic relations as 50mm 2~ 630mm 2conductor.Lay configuration ensure that the flexibility of cable conductor.Conductive surface can the semi-conductive tape of wrapped one deck flat smooth, ensures the characteristic that conductor and conductor screen are combined closely.
Insulating exruded is critical process, is the difficult point controlled in production process.This procedure calls is under super-clean environment, use Ceramic silicon rubber connecting sulphur device fabrication, temperature controls, between 5 DEG C ~ 25 DEG C, to prevent temperature too high, Ceramic silicon rubber shifts to an earlier date sulfuration, avoids because of impurity and the intrusion of aqueous vapor and the generation of the electric branch caused, water tree phenomenon.Curingprocess rate and pressure should according to T 90cure time determines concrete curingprocess rate and pressure, and after guaranteeing sulfuration, material property meets shipboard cable insulation property index request, adopts the long curing tube of 60m, sulfuration air pressure≤0.1MPa, linear velocity per minute is 45 ± 5m, guarantee the insulating material of cable 250 DEG C × 15min, 20N/cm 2condition under, during load heat extend be not more than 70%, unloading cooling after, permanent deformation is no more than 10%.Improve the physical and mechanical properties of cable.
Cabling process uses can back twist cabling device, keep in process of production every root core by torsion and even tension controlled, core uses low-smoke non-halogen flame-retardant gasket for packing to fill, and stranding band uses low smoke and zero halogen band, and after ensureing core stranding, rounding is closely knit.
Separation sleeve and oversheath operation use the plastic extruding machine that screw diameter is ψ 70mm ~ ψ 150mm, draw ratio is 16 ~ 25, compression ratio is 1.2 ~ 1.5 to produce, cable separation sleeve and oversheath are after standing the sparking test that GB/T 3048.10-2007 specifies, material homogeneity, compactness are more reliable.
Braiding armour: use braiding machine to carry out braiding armouring outside cable separation sleeve, employing braid shielded armouring mode, makes tinned copper wire be interweaved with certain rule and cover on the cable core of cable, and becomes that one deck is protected closely, screen.This braid shielded armour can play shielding aspect for cable and prevent electromagnetic interference, eliminates the induced potential of cable surface; good ground protection; play the effect of protection facility and personal security; also good mechanical protection effect can be played; can resist in the process of laying and pull; and ensure that the excellent bending performance of cable, thus ensure that product does not rupture under alternating bending or long-term minimum bending radius service condition.
A kind of light flexible low-smoke zero-halogen fire-resistant shipboard cable that the utility model proposes and technological process thereof, its conductor adopts filament diameter to meet GB/T 3956-2008 the 5th kind of zinc-plated flexible conductor, be the mode of rope-lay strand due to what adopt, cable has good bending property.The very big amplitude of pliability of cable conductor improves the reliability of cable under Long-term bend, vibration condition.
Fire-resisting cable peculiar to vessel generally adopts Mica tape to reach fire resistance at present, the fire-resisting cable that mica tape is wound around, need multi-lay winding in process of production, due to the restriction of process conditions, often easily cause overlapping the slot place to occur defect, mica tape embrittlement after burning, easily comes off, also cause fire-resistant weak effect, thus be difficult to ensure communication, electric power in case of fire safe and smooth.After adopting Mica tape, cable conductor external diameter increases, and adds the weight of cable.Due to boats and ships limited space, the external diameter increase of cable decreases nothing but boats and ships space, adds the weight of boats and ships self.Adopt Ceramic silicon rubber namely can meet fire resistance, the electric property of cable as insulating material, the external diameter of cable can be reduced again, reduce the weight of cable, reduce and manufacture production cost.
On boats and ships, cable is the same with nerve as the blood vessel of people, spread all over the whole body on naval vessel, be responsible for power supply, the effect of signal controlling and liaison, but be also the arch-criminal of " second time disaster " simultaneously, when boats and ships breaking out of fire, a large amount of toxic gases and dense smog can be discharged by the boats and ships cable ignited, not only corrode instrumentation devices, equipment is caused to paralyse, more can make personnel on warship and cause poisoning even dead because suck flue gas, if narrow and small, in the space closed, cable is ignited, then can oxygen rapidly in drain space, produce poison gas to make personnel anoxia asphyxia is poisoning and die at once.According to interrelated data introduction, in World War II sea warfare naval vessel be hit by a bullet on fire after, the smog produced due to cable fire and poison gas cause very most of casualties and the paralysis of naval vessel instrumentation devices, thus cause naval vessel out of hand, and then cause naval vessel to sink, naval vessel catch fire produce poison gas be naval vessel sinking principal element., the trend that shipboard cable should meet low cigarette, Halogen, fire-retardant, fire-resistant, low toxicity, the performance such as weather-proof, corrosion-resistant have become the development of boats and ships cable.
Therefore this novel cable adopt low smoke and zero halogen, Halogen, fire-retardant, low toxicity, fire-resistant softness Ceramic silicon rubber as insulating material, fire resistance rating can be burnt 90 minutes in 1200 DEG C of flame combustion tests, 3A fuse does not fuse, and the CWZ highest level also by Britain BS6387 is tested.Packing material, band, separation sleeve and protective sleeve are all halogen-free low-smoke flame retardant material, effectively ensure that the low cigarette of whole cable, Halogen, fire-retardant, fire-resistance property.Cable performance meets whole cable light transmittance in IEC61034-1/2 burning and is not less than 60%, and the chloric acid air release amount of cable is no more than 0.3%, and Oil repellent is no more than 0.1%, PH minimum 4.3, and conductivity is less than 10 μ S/mm, and poison exponent is less than 3.
Tinned copper wire weaving manner is adopted to carry out armouring outward at the separation sleeve of cable.Adopt braid shielded armouring mode, make tinned copper wire be interweaved with certain rule and cover on the cable core of cable, and become that one deck is protected closely, screen.This braid shielded armour can play shielding aspect for cable and prevent electromagnetic interference, eliminates the induced potential of cable surface; good ground protection; play the effect of protection facility and personal security; also good mechanical protection effect can be played; can resist in the process of laying and pull; and ensure that the minimum bending radius of cable can reach the outside diameter of cable of 4 times, thus ensure that product does not rupture under alternating bending or long-term minimum bending radius service condition.
Eliminate in the use of shipboard cable when the low cigarette, the Halogen that need, the characteristic such as fire-retardant, fire-resistant, low toxicity, softness, volume are little, effective guarantee circuit unimpeded, to meet in boats and ships and complicated lay environment, effectively can save the light weight of hull space and reduction boats and ships, improve the cargo dead-weight of boats and ships.

Claims (1)

1. a light flexible low-smoke zero-halogen fire-resistant low-voltage ship cable, it is characterized in that: comprise the low smoke and zero halogen belting layer arranged from inside to outside, low-smoke non-halogen flame-retardant separation sleeve, metal base transistor screen and low-smoke non-halogen flame-retardant protective sleeve, some Ceramic silicon rubber insulated wire cores and low-smoke non-halogen flame-retardant packing material is provided with in described low smoke and zero halogen belting layer, described Ceramic silicon rubber insulated wire cores comprises zinc-plated flexible conductor and is wrapped in the outer field Ceramic silicon rubber insulating barrier of zinc-plated flexible conductor, described zinc-plated flexible conductor carries out current delivery, described zinc-plated flexible conductor is produced by tin plating technique, conductor adopts the 5th kind of flexible conductor, described Ceramic silicon rubber insulating barrier simultaneously, and its 20 DEG C insulation specific insulations are 2 × 10 15Ω .cm, fire resistance rating meets the CWZ level Water spray of IEC60331-1:2009 and above and BS 6387, vibrations, fire resistance test, described metal base transistor screen is tinned copper wire shielding, and tinned copper wire count>=90%, monofilament external diameter is not less than 0.2mm.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104681159A (en) * 2015-03-18 2015-06-03 中天科技装备电缆有限公司 Lightweight flexible LSOH (Low Smoke Zero Halogen) fire-resistant low-voltage marine cable and process flow thereof
CN105761839A (en) * 2016-04-29 2016-07-13 东莞市民兴电缆有限公司 High-flexibility fireproof cable and preparation method thereof
CN106229046A (en) * 2016-08-31 2016-12-14 扬州光明电缆有限公司 A kind of marine fire-resistant silicon rubber insulation low-smoke zero-halogen low-toxicity cable

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104681159A (en) * 2015-03-18 2015-06-03 中天科技装备电缆有限公司 Lightweight flexible LSOH (Low Smoke Zero Halogen) fire-resistant low-voltage marine cable and process flow thereof
CN105761839A (en) * 2016-04-29 2016-07-13 东莞市民兴电缆有限公司 High-flexibility fireproof cable and preparation method thereof
CN105761839B (en) * 2016-04-29 2017-12-08 东莞市民兴电缆有限公司 A kind of high flexibility fireproof cable and preparation method thereof
CN106229046A (en) * 2016-08-31 2016-12-14 扬州光明电缆有限公司 A kind of marine fire-resistant silicon rubber insulation low-smoke zero-halogen low-toxicity cable

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