CN106448838A - Long-life and high-insulation cable and manufacturing method thereof - Google Patents

Long-life and high-insulation cable and manufacturing method thereof Download PDF

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Publication number
CN106448838A
CN106448838A CN201610737029.7A CN201610737029A CN106448838A CN 106448838 A CN106448838 A CN 106448838A CN 201610737029 A CN201610737029 A CN 201610737029A CN 106448838 A CN106448838 A CN 106448838A
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CN
China
Prior art keywords
insulating layer
inner insulating
long
external insulation
insulation layer
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Pending
Application number
CN201610737029.7A
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Chinese (zh)
Inventor
罗文长
徐兴伟
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Kunming Dianli Electric Cable Co Ltd
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Kunming Dianli Electric Cable Co Ltd
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Publication date
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Priority to CN201610737029.7A priority Critical patent/CN106448838A/en
Publication of CN106448838A publication Critical patent/CN106448838A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/02Disposition of insulation
    • H01B7/0208Cables with several layers of insulating material
    • H01B7/0216Two layers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/02Stranding-up
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06Insulating conductors or cables
    • H01B13/14Insulating conductors or cables by extrusion
    • H01B13/141Insulating conductors or cables by extrusion of two or more insulating layers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06Insulating conductors or cables
    • H01B13/14Insulating conductors or cables by extrusion
    • H01B13/148Selection of the insulating material therefor
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/02Disposition of insulation
    • H01B7/0291Disposition of insulation comprising two or more layers of insulation having different electrical properties
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28Protection against damage caused by moisture, corrosion, chemical attack or weather
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29Protection against damage caused by extremes of temperature or by flame
    • H01B7/295Protection against damage caused by extremes of temperature or by flame using material resistant to flame

Abstract

The invention discloses a long-life and high-insulation cable and a manufacturing method thereof. The cable comprises conductors formed by copper or aluminum stranding, and an insulating layer coating the conductors. The insulating layer consists of an inner insulating layer and an outer insulating layer. The inner insulating layer is made of cross-linked polyethylene, and the outer insulating layer is made of cross-linked polyolefin. The inner insulating layer and the outer insulating layer are connected by melting. The manufacturing method comprises manufacture of the conductors, extrusion molding of the inner insulating layer and the outer insulating layer, and cross-linked molding of the inner insulating layer and the outer insulating layer. The cable of the invention has strong anti-aging ability, long service life and good insulation, is non-toxic and harmless and highly safe, and has a wide range of use. The manufacturing method of the invention is high in production efficiency, energy-saving and environment-friendly.

Description

Long-life high insulated cable and its manufacture method
Technical field
The present invention relates to technical field of electric wires and cables, particularly to the long-life high insulation of long service life, good insulating Cable and its manufacture method.
Background technology
Traditional architecture uses individual layer polyvinyl chloride insulation with electric wire, suffers from the drawback that:Operating temperature (70 DEG C) and short circuit Temperature (160 DEG C) is low, easily aging, under regular service conditions only have 20-30 service life, such as exist in use excess load or Then service life is also shorter for extreme climate situation.In recent years, increase year by year because the fire incident of the aging initiation of electrical wiring has Trend, traditional architecture with electric wire be badly in need of upgrading.
Additionally due to polyvinyl chloride insulation is polar material, insulaion resistance is not high and easy moisture absorption, and electric wire once makes moist, easily Produce electric leakage, or even lead to a disaster;Also a large amount of toxic and harmfuls, smog can be produced during polychloroethylene insulation material burning, give Personal safety and property cause very big threat.Therefore exploitation is synchronous with Building life cycle, and the long-life electricity of green, environmental protection Line, is effectively reduced the Probability of the fire incident because of the aging initiation of electric wire, significant.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of long service life, good insulating, safe, nontoxic Long-life high insulated cable and its manufacture method.
In order to solve above-mentioned technical problem, the technical scheme is that:
Long-life high insulated cable, including the conductor of copper or aluminium process, and is coated on the insulating barrier outside conductor, described Insulating barrier include inner insulating layer, external insulation layer, described inner insulating layer adopts crosslinked polyethylene, and external insulation layer adopts low smoke and zero halogen Flame-proof cross-linking polyolefin;Described inner insulating layer is connected with external insulation layer melting.
Further, described inner insulating layer and external insulation layer gross thickness are not less than 0.6mm, and the thickness of wherein inner insulating layer is The 25%~50% of gross thickness.
Further, described inner insulating layer electrical conductivity≤10 μ S/mm, external insulation layer content of halogen≤0.1%.
The manufacture method of long-life high insulated cable, including following sequential steps:
A, the manufacture of conductor:By wire twisting machine by copper core or thread core of aluminum make layering, multiple, reverse bundle strand close lead Body;
B, inner insulating layer, the extrusion moulding of external insulation layer:Inner insulating layer and external insulation layer pass through using double-layer coextrusion processing System is passed through unwrapping wire, tensioning, preheating, extrusion molding gluing, cooling, is received winding displacement operation machine-shaping;
C, inner insulating layer, the cross moulding of external insulation layer:The molding cable that step b is obtained is molded by chemical crosslinking.
Further, the temperature of described extrusion molding gluing is 120 DEG C~220 DEG C.
Further, the temperature of described extrusion molding gluing is 180 DEG C.
Further, described chemical crosslinking is crosslinked with silicane.
Further, described crosslinked with silicane is by molding cable natural storage 72h~120h at room temperature;Or 80 DEG C~ 90 DEG C of hot water deposit 1h~4h;Or deposit 1h~4h in≤0.1MPa water vapour.
Using technique scheme, due to inner insulating layer and the low-smoke non-halogen flame-retardant of the polythene material using crosslinking Crosslinking polyolefin external insulation layer, using melting by the way of so that inner insulating layer is connected with external insulation layer so that the present invention is effective The operating temperature of polyvinyl chloride insulation layer presence and the short-circuit temperature that improve individual layer in prior art are low and easily aging, The technical problems such as service life is short, insulating properties is bad, the harmful substance such as halogen.Insulation system of the present invention is double layer of insulation, work Double-layer coextrusion is adopted, inside and outside insulating barrier is once extruded simultaneously, it is to avoid individual layer extrusion insulation composition surface mixes dust, moisture in skill Or the impurity such as gas and affect properties of product, composition surface is tightly combined gapless, makes product electric property more stable, ageing resistance Relatively reliable it is ensured that the advantage perfect adaptation of bi-material.Inner insulating layer is the non-hygroscopic crosslinked polyethylene of high-performance it is ensured that product Electrical property.External insulation layer is low-smoke non-halogen flame-retardant cross-linked polyolefin it is ensured that product has combustion characteristics and the mechanicalness of brilliance Energy.External insulation passes through crosslinking process, makes the molecular structure of polyethylene straight-chain be transformed into tridimensional network, greatly improves The ageing-resistant performance of material, creep-resistant property, environment resistant cracking performance, thermal deformation resistant performance and mechanical performance, are effectively ensured With the service life extending electric wire.The cable of the present invention is applied to home dwelling finishing, a class fire proof construction, important public field And personnel concentrate the power supply in place and control circuit.
Brief description
Fig. 1 is construction of cable schematic diagram of the present invention;
Fig. 2 is double-layer coextrusion system of processing schematic diagram of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described further.Here it should be noted that for The explanation of these embodiments is used to help understand the present invention, but does not constitute limitation of the invention.Additionally, it is disclosed below As long as each embodiment of the present invention in involved technical characteristic do not constitute conflict each other and just can be mutually combined.
As shown in Figure 1, long-life high insulated cable includes the conductor 1 of copper or aluminium process, and is coated on conductor 1 Outer inner insulating layer 2 and external insulation layer 3, are embodied as middle inner insulating layer 2 and adopt crosslinked polyethylene, and external insulation layer 3 adopts low cigarette The cross-linked polyolefin of halogen-free flameproof;Inner insulating layer 2 is connected using melting with external insulation layer 3.
Technique scheme, due to the inner insulating layer 2 of polythene material of crosslinking that adopts and low-smoke non-halogen flame-retardant Crosslinked polyolefinic external insulation layer 3, inner insulating layer 2, the polyolefin of external insulation layer 3 define dimensional network structure, effectively carry The high heat resistance of inner insulating layer 2 and external insulation layer 3, reduces relative thermal elongation percentage, improves product aging-resistant ability.With When reduce hygroscopicity, improve insulating properties;Content of halogen in material low it is achieved that nontoxic.
In order to improve cable ageing resistance, heat resistance, insulating properties and security further, inner insulating layer 2 and outer absolutely Edge layer 3 gross thickness is not less than 0.6mm, and the wherein thickness of inner insulating layer 2 is the 25%~50% of gross thickness.This case is embodied as In, the thickness of inner insulating layer 2 is the 40% of gross thickness.Electrical conductivity≤10 μ the S/mm of inner insulating layer 2, external insulation layer 3 content of halogen ≤ 0.1%;It is embodied as the electrical conductivity 6 μ S/mm of middle inner insulating layer 2, external insulation layer 3 content of halogen is 0.08%.
The manufacture method of long-life high insulated cable, including following sequential steps:
A, the manufacture of conductor:By wire twisting machine by copper core or thread core of aluminum make layering, multiple, reverse bundle strand close lead Body;
B, inner insulating layer, the extrusion moulding of external insulation layer:Inner insulating layer and external insulation layer pass through using double-layer coextrusion processing System is passed through unwrapping wire, tensioning, preheating, extrusion molding gluing, cooling, is received winding displacement operation machine-shaping;
C, inner insulating layer, the cross moulding of external insulation layer:The molding cable that step b is obtained is molded by chemical crosslinking.
As shown in Figure 2, this case be embodied as middle employing double-layer coextrusion system of processing include actinobacillus device 4, tensioning dress Put 5, preheating device 6, plastic extruder 7, automatic feeding device 8, mould 9, cooling device 10, meter counter 11, traction wheel Plastic extruder 7, in implementation process, is now preheated by the 12nd, winding and arranging device 13, and by automatic feeding device 8 to plastic extrusion Add polyethylene, low smoke halogen-free flame-retardant polyolefin in machine 7.In being embodied as, the temperature of plastic extruder 7 reaches 120 DEG C~220 DEG C, this case is embodied as middle plastic extruder 7 temperature and is 180 DEG C.And pass through pull rope by copper core or aluminium using traction wheel 12 The conductor 1 that core makes layering, multiple, reverse bundle strand is closed passes through tensioning apparatus 5 and preheating device 6 to reach mould 9.Conductor 1 internal stress being effectively eliminated conductor when by preheating device 6, is increased percentage elongation and improves flexibility, improves gluing cladding Molding effect.
In extrusion, polyethylene in automatic feeding device 8, low smoke halogen-free flame-retardant polyolefin are by gravity or charging It is threaded in the machine barrel of plastic extruder 7, under the thrust of plastic extruder 7 rotary screw, constantly push ahead, from Preheating section starts gradually to move to homogenizing zone.Meanwhile, polyethylene, low smoke halogen-free flame-retardant polyolefin are subject to plastic extruder 7 It is changed in the presence of shearing friction between the stirring of screw rod and squeezing action, and the outer heat in machine barrel and plastics and equipment Melting fluidised form, forms the stream of continuous uniform in the screw channel of plastic extruder 7.Under the temperature action setting, polyethylene, low Cigarette halogen-free anti-flaming polyolefin is changed into the plastic object of molten condition from solid state, then pushing away via plastic extruder 7 screw rod Move or stir, the polyethylene plastifying completely, low smoke halogen-free flame-retardant polyolefin are pushed head.Again through the mould of mould 9 Annular gap between core and die sleeve, from die sleeve mouth extrusion, makes the polyethylene of molten condition, low smoke halogen-free flame-retardant polyolefin in high pressure Under be coated on conductor 1 around, form continuously closely knit inner insulating layer 2 or external insulation layer 3, then through apparatus for supercooling 10 cooling and Solidification, forms cable.Meter counter 11 is set between cooling device 10 and traction wheel 12, effectively calculates cable length, and will lead to Cross winding and arranging device 13 and realize the winding displacement of extrusion moulding cable, winding folding and unfolding on take-up reel.
And by the good cable of folding and unfolding natural storage 72h~120h at room temperature;Or deposit 1h in 80 DEG C~90 DEG C hot water ~4h;Or deposit 1h~4h in≤0.1MPa water vapour.This case is embodied as middle depositing using in 80 DEG C~90 DEG C hot water 2.5h.
The crosslinked with silicane principle that the present invention adopts:
Crosslinked with silicane is one kind of chemical crosslinking, and usual crosslinkable silane is associated with multiple side such as two-step method, one-step method and copolymerization method Method.But chemical reaction is essentially identical, its chemical reaction process approximately as:
A) initiator DCP resolves into free radical
B) under the triggering of DCP, attract the hydrogen on ethylene chain, make polyethylene molecular chain generate free radical (also referred to as dehydrogenation Reaction)
C) generate grafted polyethylene
Free radical grafting agent is taking A151 (vinyl front three cyanoalkysilane) as a example:
Generate grafted polyethylene and connect the branch chain containing siloxy group
D) hydrolytic condensation generates silanol, eventually forms whole silane molecules and is connected to polyethylene alkene chain up.There are two kinds of reactions Mechanism:
Can be seen that crosslinked with silicane reaction from reaction equation above as general chemical crosslinking, DCP decomposes, in polyethylene Upper formation contact.Due to silane with polycthylene grafted, further conventional chemical crosslinking is prevented from, and contact is from Polyethylene Chain simultaneously On move on on silane molecule.When silane molecule draws a H atom on other polyethylene, thus playing the biography being grafted further Broadcast effect.This process constantly repeats, until big silane molecule is grafted to Polyethylene Chain up.The method only needs on a small quantity DCP is to cause first contact, thus causing grafting chain reaction (as with 1.5 parts of silane, about DCP0.1 part). The maximum temperature of grafting is 200 DEG C about.
The polyethylene being grafted is still thermoplastic it is easy to be extruded by common extruding machine.When in grafted silane plus When entering hydrone, chemical change starts, and the oxygen inhaled in water forms hydrolysis.
Catalyst the most general is dibutyl tin laurate ester (DBDTL), at dibutyl tin laurate ester (DBDTL) Under the catalyst of (Dibutyl tin dilaurate), it is condensed into crosslinked polyethylene.The time of hydrolysis and condensation is because of the insulation of cable Thickness is different and different.When cable is immersed in 80 DEG C of water, after 1~6kV cable needs 4~5 hours, 10~20kV cable then needs After wanting 10~20 hours, up to more than 70% degree of cross linking.
The outstanding advantages of silane crosslinking technology are not limited by crosslinking time in extrusion line, can make full use of extruder Extrusion capacity and reach highest linear velocity, medium O. cable line up to 50m/min about speed. crosslinked needed for crosslinked with silicane Agent DCP is very few, to preventing from producing space in insulation, improves its electric property and is beneficial to.
In specific implementation process of the present invention, Silane Grafted and the one step completed side of extrusion molding (are referred to using one-step method Method.).In one-step technology, a, b, c three-step reaction completes during insulating exruded, four-step reaction then depositing after the extrusion Complete during putting.
Above in association with accompanying drawing, embodiments of the present invention are explained in detail, but the invention is not restricted to described enforcement Mode.For a person skilled in the art, in the case of without departing from the principle of the invention and spirit, to these embodiments Carry out multiple changes, modification, replacement and modification, still fall within protection scope of the present invention.

Claims (8)

1. long-life high insulated cable, including the conductor of copper or aluminium process, and is coated on the insulating barrier outside conductor, its feature It is, described insulating barrier includes inner insulating layer, external insulation layer, described inner insulating layer adopts crosslinked polyethylene, and external insulation layer is adopted Use low-smoke non-halogen flame-retardant cross-linked polyolefin;Described inner insulating layer is connected with external insulation layer melting.
2. long-life according to claim 1 high insulated cable is it is characterised in that described inner insulating layer and external insulation layer are total Thickness is not less than 0.6mm, and the wherein thickness of inner insulating layer is the 25%~50% of gross thickness.
3. long-life high insulated cable according to claim 2 is it is characterised in that described inner insulating layer electrical conductivity≤10 μ S/mm, external insulation layer content of halogen≤0.1%.
4. long-life high insulated cable manufacture method it is characterised in that:Including following sequential steps:
A, the manufacture of conductor:By wire twisting machine, copper core or thread core of aluminum are made the conductor of layering, the conjunction of multiple, reverse bundle strand;
B, inner insulating layer, the extrusion moulding of external insulation layer:Inner insulating layer and external insulation layer pass through using double-layer coextrusion system of processing By unwrapping wire, tensioning, preheating, extrusion molding gluing, cooling, receive winding displacement operation machine-shaping;
C, inner insulating layer, the cross moulding of external insulation layer:The molding cable that step b is obtained is molded by chemical crosslinking.
5. long-life according to claim 4 high insulated cable manufacture method it is characterised in that:Described extrusion molding gluing Temperature is 120 DEG C~220 DEG C.
6. long-life according to claim 5 high insulated cable manufacture method it is characterised in that:Described extrusion molding gluing Temperature is 180 DEG C.
7. long-life according to claim 6 high insulated cable manufacture method it is characterised in that:Described chemical crosslinking is Crosslinked with silicane.
8. long-life according to claim 7 high insulated cable manufacture method it is characterised in that:Described crosslinked with silicane is By molding cable natural storage 72h~120h at room temperature;Or deposit 1h~4h in 80 DEG C~90 DEG C hot water;Or in≤0.1MPa 1h~4h is deposited in water vapour.
CN201610737029.7A 2016-08-27 2016-08-27 Long-life and high-insulation cable and manufacturing method thereof Pending CN106448838A (en)

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Application Number Priority Date Filing Date Title
CN201610737029.7A CN106448838A (en) 2016-08-27 2016-08-27 Long-life and high-insulation cable and manufacturing method thereof

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109616262A (en) * 2018-12-28 2019-04-12 杭州电缆股份有限公司 The high speed production process of 64/110kV power-frequency electromagnetic fields
CN110509519A (en) * 2019-08-20 2019-11-29 国网山东省电力公司滨州供电公司 A kind of bilayer heterogeneous material electric wire and preparation method thereof
CN114267476A (en) * 2021-11-29 2022-04-01 乐庭电线工业(惠州)有限公司 Signal wire unit, preparation method thereof and VGA cable

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101148522A (en) * 2007-10-29 2008-03-26 浙江万马高分子材料股份有限公司 Technique for manufacturing natural crosslinking polyethylene-insulated cable material
JP2008181754A (en) * 2007-01-24 2008-08-07 Hitachi Cable Ltd Electric wire cable using silane cross-linked polyolefin, and its manufacturing method
CN103578660A (en) * 2013-11-05 2014-02-12 四川明星电缆股份有限公司 Method for manufacturing low-voltage power cable used in third-generation nuclear power station containment vessel
CN104217825A (en) * 2014-08-28 2014-12-17 昆山勃盛电子有限公司 Production method about once-extrusion forming of cable insulation layer and sheath layer
CN105304167A (en) * 2015-11-03 2016-02-03 昆明电立电缆有限公司 Long-life double-layer wire and manufacturing method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008181754A (en) * 2007-01-24 2008-08-07 Hitachi Cable Ltd Electric wire cable using silane cross-linked polyolefin, and its manufacturing method
CN101148522A (en) * 2007-10-29 2008-03-26 浙江万马高分子材料股份有限公司 Technique for manufacturing natural crosslinking polyethylene-insulated cable material
CN103578660A (en) * 2013-11-05 2014-02-12 四川明星电缆股份有限公司 Method for manufacturing low-voltage power cable used in third-generation nuclear power station containment vessel
CN104217825A (en) * 2014-08-28 2014-12-17 昆山勃盛电子有限公司 Production method about once-extrusion forming of cable insulation layer and sheath layer
CN105304167A (en) * 2015-11-03 2016-02-03 昆明电立电缆有限公司 Long-life double-layer wire and manufacturing method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109616262A (en) * 2018-12-28 2019-04-12 杭州电缆股份有限公司 The high speed production process of 64/110kV power-frequency electromagnetic fields
CN110509519A (en) * 2019-08-20 2019-11-29 国网山东省电力公司滨州供电公司 A kind of bilayer heterogeneous material electric wire and preparation method thereof
CN114267476A (en) * 2021-11-29 2022-04-01 乐庭电线工业(惠州)有限公司 Signal wire unit, preparation method thereof and VGA cable
CN114267476B (en) * 2021-11-29 2024-03-22 乐庭电线工业(惠州)有限公司 Signal line unit, preparation method thereof and VGA cable

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