CN105741966A - Metal sheath bureau communication cable for rail transit - Google Patents
Metal sheath bureau communication cable for rail transit Download PDFInfo
- Publication number
- CN105741966A CN105741966A CN201610286281.0A CN201610286281A CN105741966A CN 105741966 A CN105741966 A CN 105741966A CN 201610286281 A CN201610286281 A CN 201610286281A CN 105741966 A CN105741966 A CN 105741966A
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- China
- Prior art keywords
- antimony oxide
- coated
- sheath
- communication cable
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/22—Metal wires or tapes, e.g. made of steel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/24—Devices affording localised protection against mechanical force or pressure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
Abstract
The invention discloses a metal sheath bureau communication cable for rail transit. The metal sheath bureau communication cable comprises a plurality of intertwisted insulated cores which are packed by a wrapping polyester tape. Factice is filled between the intertwisted insulated cores and the wrapping polyester tape. A water blocking layer clads the wrapping polyester tape. A PE heat insulating layer clads the water blocking layer. An aluminum sheath clads the PE heat insulating layer. A low-smoke halogen-free inner sheath clads the aluminum sheath. A high-magnet-conductivity steel tape armoring layer clads the low-smoke halogen-free inner sheath. A low-smoke halogen-free outer sheath clads the high-magnet-conductivity steel tape armoring layer. The metal sheath bureau communication cable greatly improves water blocking performance, shielding performance (information transmission safety), mechanical performance and flame retardance of the cable. The shielding coefficient of a pure aluminum metal sheath and the high-magnet-conductivity steel tape armoring layer to the cable is smaller than or equal with 0.2, thereby greatly improving shielding coefficient of the cable and improving information transmission safety of the cable.
Description
Technical field
The present invention relates to field of telecommunications cables, be specifically related to track traffic protective metal shell office communication cable.
Background technology
Along with urban rail transit in China cause quickly develops, the demand of track traffic office communication cable is also being continuously increased.According to trade information, within following several years, China will have more than 20 city plan will build urban track traffic (subway and light rail), and the line length rate of increase of city rail traffic in 2011 to 2015 is 21%.Constantly sending out of track traffic is opened, and its supporting electric wire performance, structure are proposed new problem, and particularly the cable of modern city track traffic is particularly important.
Track traffic has personnel and concentrates the features such as intensive, flow of the people big, entrance and exit of the passage restriction, therefore, by the impact of track traffic environment particularity, the security requirement of urban rail transit construction is the highest.Track traffic is once breaking out of fire, and power communication system is interrupted immediately, and illumination and communication are all interrupted, and not only allows the people in fire be difficult to flee from dangerous situation, also makes troubles to fire-fighting and rescue, and in order to prevent fire, track traffic cable needs fire-resistant communication cable.Communication cable is needed to have good fire-resistance property, it is effectively improved the overload capacity of circuit, particularly ensure that the integrity in circuit certain time during breaking out of fire, meet the emergency processing of fire-fighting, except the fire resistance of communication cable has higher requirements, also need to that there is good shielding properties, it is ensured that the safety in message transmitting procedure.
Summary of the invention
It is an object of the invention to the problem above overcoming prior art to exist, a kind of track traffic protective metal shell office communication cable is provided, the shielding properties of the communication cable of the present invention is obviously improved, through pilot production, screening factor≤0.2 of this communication cable, this communication cable has reached significantly high degree of safety in message transmitting procedure, and the communication point in the present invention is seen also by the compositional refinements to CABLE MATERIALS, substantially increases the fire resistance of communication cable.
For realizing above-mentioned technical purpose, reaching above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of track traffic protective metal shell office communication cable, it includes from inside to outside successively:
Some strands of strand insulation high heart yearns, described strand insulation high heart yearn is coated with by wrapped polyester belt, factice for filling between described strand insulation high heart yearn and described wrapped polyester belt, it is coated with water blocking layer outside described wrapped polyester belt, PE thermal insulation layer it is coated with outside described water blocking layer, it is coated with aluminium sheath outside described PE thermal insulation layer, low smoke and zero halogen inner sheath it is coated with outside described aluminium sheath, it is coated with high magnetic conduction steel-tape armouring layer outside described low smoke and zero halogen inner sheath, outside described high magnetic conduction steel-tape armouring layer, is coated with low smoke and zero halogen oversheath；
Described low smoke and zero halogen inner sheath and described low smoke and zero halogen oversheath are flame-retardant organosilane cross-linked poly-ethylene, described flame-proof silicone hydride polythene material formula, according to mass percent, including:
TDE 45-67.5%
Antimony oxide 15-22.5%
Low Density Polyethylene 8-32%
Polypropylene grafted maleic anhydride 2-8%
Wherein, the mass ratio of described TDE and described antimony oxide is 3:1, and the mass ratio of described Low Density Polyethylene and described polypropylene grafted maleic anhydride is 4:1；
Described TDE is fire retardant with modified antimony oxide, and described Low Density Polyethylene is masterbatch, and described polypropylene grafted maleic anhydride is compatilizer.
In a preferred embodiment of the present invention, farther including, described antimony oxide titanate coupling agent NDZ-311 carries out surface modification, time modified consumption is described antimony oxide consumption the 2% of described titanate coupling agent NDZ-311.
In a preferred embodiment of the present invention, farther including, the method preparing described flame-proof silicone hydride polythene material, step is:
(1) antimony oxide surface modification, by unmodified antimony oxide dry 5h at 80 DEG C of temperature, weigh titanate coupling agent NDZ-311, the consumption of described titanate coupling agent NDZ-311 is the 2% of described antimony oxide consumption, the dehydrated alcohol dilution of described titanate coupling agent NDZ-311 equal in quality, titanate coupling agent NDZ-311 after dilution is sprayed antimony oxide surface after the drying, then mix homogeneously under room temperature, then at 80 DEG C of temperature, dries 5h；
(2) according to the ratio of component each in material prescription, weigh TDE, modified antimony oxide, Low Density Polyethylene, polypropylene grafted maleic anhydride, then TDE, modified antimony oxide, Low Density Polyethylene, polypropylene grafted maleic anhydride are put in pulverizer, it is uniformly mixed, add in double screw extruder, the extrusion temperature of described double screw extruder 140 DEG C-170 DEG C, screw speed is 300r/min, obtains flame-retardant organosilane cross-linked poly-ethylene material after extrusion.
In a preferred embodiment of the present invention, farther include, the thickness of the wrapped polyester belt of wrapped described strand insulation high heart yearn is 0.5mm, the thickness of described PE thermal insulation layer is 1.5mm, described PE thermal insulation layer is outside is coated with described aluminium sheath, described aluminium sheath is outside is coated with described low smoke and zero halogen inner sheath, and described low smoke and zero halogen inner sheath outer gap is around high magnetic conduction steel band of double-baging.
In a preferred embodiment of the present invention, farther include, outside described strand insulation high heart yearn, be coated with insulating barrier.
The invention has the beneficial effects as follows:
One, track traffic of the present invention protective metal shell office communication cable, its structure have employed the interior oversheath of waterstop, pure aluminum metal sheath, high magnetic conduction steel-tape armouring and low smoke and zero halogen, thus substantially increasing the block-water performance of cable, shielding properties (information transmission security degree), mechanical performance and fire resistance；Described pure aluminum metal sheath and high magnetic conduction steel-tape armouring the screening factor of cable can reach≤0.2, substantially improve the screening factor of cable, improve the safety of cable information transmission.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention, and can be practiced according to the content of description, below with presently preferred embodiments of the present invention and coordinate accompanying drawing describe in detail as after.The specific embodiment of the present invention is shown in detail in by following example and accompanying drawing thereof.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in embodiment of the present invention technology, the accompanying drawing used required in the description of embodiment technology will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of communication cable of the present invention；
Wherein, 1-strand insulation high heart yearn, 2-ointment, the wrapped polyester belt of 3-, 4-water blocking layer, 5-PE thermal insulation layer, 6-aluminium sheath, 7-low smoke and zero halogen sheath, 8-height magnetic conduction steel-tape armouring layer, 9-low smoke and zero halogen oversheath.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment 1
With reference to shown in Fig. 1, a kind of track traffic protective metal shell office communication cable disclosed in embodiment 1, cable includes from inside to outside successively:
Ground floor, strand insulation high heart yearn 1；
The second layer, ointment 2 are filled；
The water blocking layer 4 of third layer, wrapped polyester belt 3 and waterstop composition；
4th layer, PE thermal insulation layer 5；
Layer 5, aluminium sheath 6；
Layer 6, low smoke and zero halogen inner sheath 7；
Layer 7, high magnetic conduction steel-tape armouring 8；
8th layer, low smoke and zero halogen oversheath 9.
Above-mentioned strand insulation high heart yearn is made up of strands insulation core wire, and is coated with insulating barrier in the outside of strands insulation core wire, and aluminium sheath 6 is to be wrapped by one layer of fine aluminium with through vertical and weld the one layer of pure aluminum metal restrictive coating formed.
The thickness of the wrapped polyester belt 3 of wrapped above-mentioned strand insulation high heart yearn 1 is 0.5mm, the thickness of above-mentioned PE thermal insulation layer 5 is 1.5mm, above-mentioned PE thermal insulation layer 5 is outside is coated with above-mentioned aluminium sheath 6, above-mentioned aluminium sheath 6 is outside is coated with above-mentioned low smoke and zero halogen inner sheath 7, and above-mentioned low smoke and zero halogen inner sheath 7 outer gap is around high magnetic conduction steel band 8 of double-baging.
In embodiment 1, the thickness of communication cable oversheath performs GB/T2952 standard.By testing, the organization plan of the communication cable in embodiment 1 makes whole communication cable have good screening factor test value, and screening factor test value is 0.082-0.124.
Embodiment 2
Disclosed in embodiment 2, the structure of communication cable is, ground floor, strand insulation high heart yearn 1；
The second layer, ointment 2 are filled；
The water blocking layer 4 of third layer, wrapped polyester belt 3 and waterstop composition；
4th layer, PE thermal insulation layer 5；
Layer 5, aluminium sheath 6；
Layer 6, low smoke and zero halogen inner sheath 7；
Layer 7, high magnetic conduction steel-tape armouring 8；
8th layer, low smoke and zero halogen oversheath 9.
Above-mentioned strand insulation high heart yearn is made up of strands insulation core wire 1, and is coated with insulating barrier in the outside of strands insulation core wire 1, and aluminium sheath 6 is to be wrapped by one layer of fine aluminium with through vertical and weld the one layer of pure aluminum metal restrictive coating formed.
The thickness of the wrapped polyester belt 3 of wrapped above-mentioned strand insulation high heart yearn 1 is 0.5mm, the thickness of above-mentioned PE thermal insulation layer 5 is 1.5mm, above-mentioned PE thermal insulation layer 5 is outside is coated with above-mentioned aluminium sheath 6, above-mentioned aluminium sheath 6 is outside is coated with above-mentioned low smoke and zero halogen inner sheath 7, and above-mentioned low smoke and zero halogen inner sheath 7 outer gap wrapped monolayer height magnetic conduction steel strip rolling stricture of vagina indulges bag armouring.
In embodiment 1-2, low smoke and zero halogen inner sheath and above-mentioned low smoke and zero halogen oversheath are flame-retardant organosilane cross-linked poly-ethylene, above-mentioned flame-proof silicone hydride polythene material formula, according to mass percent, including:
TDE 45-67.5%
Antimony oxide 15-22.5%
Low Density Polyethylene 8-32%
Polypropylene grafted maleic anhydride 2-8%
Wherein, the mass ratio of above-mentioned TDE and above-mentioned antimony oxide is 3:1, and the mass ratio of above-mentioned Low Density Polyethylene and above-mentioned polypropylene grafted maleic anhydride is 4:1；
Above-mentioned TDE is fire retardant with modified antimony oxide, and above-mentioned Low Density Polyethylene is masterbatch, and above-mentioned polypropylene grafted maleic anhydride is compatilizer.
Wherein, above-mentioned antimony oxide titanate coupling agent NDZ-311 carries out surface modification, time modified consumption is above-mentioned antimony oxide consumption the 2% of above-mentioned titanate coupling agent NDZ-311.
The method preparing above-mentioned flame-proof silicone hydride polythene material, step is:
(1) antimony oxide surface modification, by unmodified antimony oxide dry 5h at 80 DEG C of temperature, weigh titanate coupling agent NDZ-311, the consumption of above-mentioned titanate coupling agent NDZ-311 is the 2% of above-mentioned antimony oxide consumption, the dehydrated alcohol dilution of above-mentioned titanate coupling agent NDZ-311 equal in quality, titanate coupling agent NDZ-311 after dilution is sprayed antimony oxide surface after the drying, then mix homogeneously under room temperature, then at 80 DEG C of temperature, dries 5h.
(2) according to the ratio of component each in material prescription, weigh TDE, modified antimony oxide, Low Density Polyethylene, polypropylene grafted maleic anhydride, then TDE, modified antimony oxide, Low Density Polyethylene, polypropylene grafted maleic anhydride are put in pulverizer, it is uniformly mixed, add in double screw extruder, the extrusion temperature of above-mentioned double screw extruder 140 DEG C-170 DEG C, screw speed is 300r/min, obtains flame-retardant organosilane cross-linked poly-ethylene material after extrusion.
The CABLE MATERIALS of embodiment 1～2 adopts bromide fire retardant, and bromide fire retardant addition is few, and the compatibility is good; and flame retarding efficiency is high; it is a kind of protection type flame-retardant organosilane cross-linked poly-ethylene, and formula is reasonable, make cable material have good fire resistance, mechanical property, warm blood performance.
The cable performance indexes of embodiment 1～2, as shown in table 1:
Table 1
| Index | Embodiment 1 | Embodiment 2 |
| Screening factor | ≤0.2 | ≤0.2 |
| Fire-retardant | Fire-retardant B level | Fire-retardant B level |
Adopt above-mentioned track traffic protective metal shell office communication cable, its structure have employed the interior oversheath of waterstop, pure aluminum metal sheath, high magnetic conduction steel-tape armouring and low smoke and zero halogen, thus substantially increasing the block-water performance of cable, shielding properties (information transmission security degree), mechanical performance and fire resistance；Above-mentioned pure aluminum metal sheath and high magnetic conduction steel-tape armouring the screening factor of cable can reach≤0.2, substantially improve the screening factor of cable, improve the safety of cable information transmission.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (5)
1. a track traffic protective metal shell office communication cable, it includes from inside to outside successively:
Some strands of strand insulation high heart yearns, described strand insulation high heart yearn is coated with by wrapped polyester belt, factice for filling between described strand insulation high heart yearn and described wrapped polyester belt, it is coated with water blocking layer outside described wrapped polyester belt, PE thermal insulation layer it is coated with outside described water blocking layer, it is coated with aluminium sheath outside described PE thermal insulation layer, low smoke and zero halogen inner sheath it is coated with outside described aluminium sheath, it is coated with high magnetic conduction steel-tape armouring layer outside described low smoke and zero halogen inner sheath, outside described high magnetic conduction steel-tape armouring layer, is coated with low smoke and zero halogen oversheath；It is characterized in that,
Described low smoke and zero halogen inner sheath and described low smoke and zero halogen oversheath are flame-retardant organosilane cross-linked poly-ethylene, described flame-proof silicone hydride polythene material formula, according to mass percent, including:
TDE 45-67.5%
Antimony oxide 15-22.5%
Low Density Polyethylene 8-32%
Polypropylene grafted maleic anhydride 2-8%
Wherein, the mass ratio of described TDE and described antimony oxide is 3:1, and the mass ratio of described Low Density Polyethylene and described polypropylene grafted maleic anhydride is 4:1；
Described TDE is fire retardant with modified antimony oxide, and described Low Density Polyethylene is masterbatch, and described polypropylene grafted maleic anhydride is compatilizer.
2. track traffic according to claim 1 protective metal shell office communication cable, it is characterized in that, described antimony oxide titanate coupling agent NDZ-311 carries out surface modification, time modified consumption is described antimony oxide consumption the 2% of described titanate coupling agent NDZ-311.
3. track traffic according to claim 2 protective metal shell office communication cable, it is characterised in that the method preparing described flame-proof silicone hydride polythene material, step is:
(1) antimony oxide surface modification, by unmodified antimony oxide dry 5h at 80 DEG C of temperature, weigh titanate coupling agent NDZ-311, the consumption of described titanate coupling agent NDZ-311 is the 2% of described antimony oxide consumption, the dehydrated alcohol dilution of described titanate coupling agent NDZ-311 equal in quality, titanate coupling agent NDZ-311 after dilution is sprayed antimony oxide surface after the drying, then mix homogeneously under room temperature, then at 80 DEG C of temperature, dries 5h；
(2) according to the ratio of component each in material prescription, weigh TDE, modified antimony oxide, Low Density Polyethylene, polypropylene grafted maleic anhydride, then TDE, modified antimony oxide, Low Density Polyethylene, polypropylene grafted maleic anhydride are put in pulverizer, it is uniformly mixed, add in double screw extruder, the extrusion temperature of described double screw extruder 140 DEG C-170 DEG C, screw speed is 300r/min, obtains flame-retardant organosilane cross-linked poly-ethylene material after extrusion.
4. track traffic according to claim 1 protective metal shell office communication cable, it is characterized in that, the thickness of the wrapped polyester belt of wrapped described strand insulation high heart yearn is 0.5mm, the thickness of described PE thermal insulation layer is 1.5mm, described PE thermal insulation layer is outside is coated with described aluminium sheath, described aluminium sheath is outside is coated with described low smoke and zero halogen inner sheath, and described low smoke and zero halogen inner sheath outer gap is around high magnetic conduction steel band of double-baging.
5. track traffic according to claim 1 protective metal shell office communication cable, it is characterised in that be coated with insulating barrier outside described strand insulation high heart yearn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610286281.0A CN105741966A (en) | 2016-05-04 | 2016-05-04 | Metal sheath bureau communication cable for rail transit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610286281.0A CN105741966A (en) | 2016-05-04 | 2016-05-04 | Metal sheath bureau communication cable for rail transit |
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| CN105741966A true CN105741966A (en) | 2016-07-06 |
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| CN201610286281.0A Pending CN105741966A (en) | 2016-05-04 | 2016-05-04 | Metal sheath bureau communication cable for rail transit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106084427A (en) * | 2016-08-12 | 2016-11-09 | 江苏亨通线缆科技有限公司 | A kind of fire resistant flame retardant track traffic communication cable |
| CN106298001A (en) * | 2016-08-12 | 2017-01-04 | 江苏亨通线缆科技有限公司 | Electromagnetic wave shielding communication cable for track traffic |
| CN106328298A (en) * | 2016-08-29 | 2017-01-11 | 苏州意华电工有限公司 | High and low temperature resistant communication cable |
| CN106810721A (en) * | 2016-12-20 | 2017-06-09 | 广西华锑科技有限公司 | A kind of surface modifying method of the special antimony oxide of nylon plastic(s) |
| CN110767371A (en) * | 2019-11-04 | 2020-02-07 | 安徽恒晶电缆集团有限公司 | High-temperature computer cable and processing technology thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106084427A (en) * | 2016-08-12 | 2016-11-09 | 江苏亨通线缆科技有限公司 | A kind of fire resistant flame retardant track traffic communication cable |
| CN106298001A (en) * | 2016-08-12 | 2017-01-04 | 江苏亨通线缆科技有限公司 | Electromagnetic wave shielding communication cable for track traffic |
| CN106328298A (en) * | 2016-08-29 | 2017-01-11 | 苏州意华电工有限公司 | High and low temperature resistant communication cable |
| CN106810721A (en) * | 2016-12-20 | 2017-06-09 | 广西华锑科技有限公司 | A kind of surface modifying method of the special antimony oxide of nylon plastic(s) |
| CN110767371A (en) * | 2019-11-04 | 2020-02-07 | 安徽恒晶电缆集团有限公司 | High-temperature computer cable and processing technology thereof |
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Application publication date: 20160706 |
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