CN109686490A - A kind of unmasked cable - Google Patents
A kind of unmasked cable Download PDFInfo
- Publication number
- CN109686490A CN109686490A CN201910136425.8A CN201910136425A CN109686490A CN 109686490 A CN109686490 A CN 109686490A CN 201910136425 A CN201910136425 A CN 201910136425A CN 109686490 A CN109686490 A CN 109686490A
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- China
- Prior art keywords
- layer
- cable
- insulating layer
- unmasked
- cable core
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Classifications
-
- 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
- H01B11/08—Screens specially adapted for reducing cross-talk
-
- 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
- H01B11/005—Quad constructions
-
- 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
- H01B11/10—Screens specially adapted for reducing interference from external sources
- H01B11/1016—Screens specially adapted for reducing interference from external sources composed of a longitudinal lapped tape-conductor
-
- 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
- H01B11/10—Screens specially adapted for reducing interference from external sources
- H01B11/1025—Screens specially adapted for reducing interference from external sources composed of a helicoidally wound tape-conductor
-
- 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
- H01B13/06—Insulating conductors or cables
-
- 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
- H01B13/08—Insulating conductors or cables by winding
-
- 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
-
- 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
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0225—Three or more layers
-
- 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
- H01B7/02—Disposition of insulation
- H01B7/0241—Disposition of insulation comprising one or more helical wrapped layers of insulation
-
- 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
- H01B7/02—Disposition of insulation
- H01B7/0258—Disposition of insulation comprising one or more longitudinal lapped layers of insulation
Abstract
This application discloses a kind of unmasked cables, are related to unmasked cable structure technical field.The application includes: cable core, which includes conductor；Insulating layer, the insulating layer are arranged on the outside of the cable core；Shielded layer, the shielded layer are arranged on the outside of insulating layer, and shielded layer includes conductive layer and external insulation layer；Restrictive coating, the restrictive coating are arranged on the outside of shielded layer.The application between shielded layer and cable core by being arranged a layer insulating, conductive layer on the inside of shielded layer is come with cable core isolation, conductive layer is reduced to interfere the charge of cable core, compared with existing FTP, it does not need that drain wire is additionally arranged and carries out ground connection installation, there is preferable shield effectiveness again compared with existing UTP.
Description
Technical field
This application involves unmasked cable fields, are related specifically to a kind of unmasked cable.
Background technique
Existing CAT.6A unmasked cable (Unshielded Twisted Paired, hereinafter referred to as UTP) does not have generally
Standby function of shielding is prevented so needing to be improved its anti-interference ability using some well known technological means in common peace
The mutual crosstalk of cable adjacent to each other in assembling structure.For example, by cable install bunchy when using different laying up pitch cable,
Or the line of cable inner is come and increases the gap between line pair and oversheath to being mutually isolated using crossing skeleton, may be used also
To be reduced as far as the contact area of adjacent cables, the phase between cable and cable, between line pair and line pair is reduced with this
Mutual cross-talk.
Despite the use of above-mentioned interference protection measure, but existing UTP CAT.6A class cable cannot prevent alien crosstalk completely
Interference, it is also necessary to take additional salvo to prevent crosstalk, increase anti-interference ability.
It can also be carried out data transmission using shielded cable (Foiled Twisted Pair, hereinafter referred to as FTP), but FTP
Be by the outside of cable core using by metal foil shield the shielded layer that forms of band and the drain wire being arranged on the inside of the shielded layer into
Row shielding electromagnetic interference, therefore its use cost is naturally larger than the cost of UTP.In FTP, shielding band is generally using band, volume
It the outside that the form that one or more modes combine is coated on cable core such as knits, wind, there is double-layer structure, by wide insulating layer
(such as mylar PET) and wide metal foil layer (such as aluminium foil) are pasted by glue, baking is combined.Wherein, absolutely
Outwardly, metal foil layer inwardly, is provided with the drain wire on a piece-root grafting ground, metal foil layer to edge layer between metal foil layer and cable cable core
It will accumulate in the discharge of the electrostatic on metal foil layer to shield electromagnetic interference, and by drain wire, prevent electrostatic interference, realize screen
The function of covering.In addition, drain wire must be made to be grounded in cable and damper ends installs connector using when FTP, installation steps ratio UTP is multiple
It is miscellaneous, while increasing installation cost.
It also proposed a kind of discontinuous shielding band at present, non-conductive gap is arranged in the program on the shielding layer, which can
The other end is transmitted to generate interference from one end of cable to avoid the signal carried out in shielded layer, can be avoided in cable
It is middle to use drain wire, reduce the production cost and installation cost of cable.But the gap can also generate electromagnetic leakage, lead to gold
The shield effectiveness for belonging to shielded layer is had a greatly reduced quality.
Summary of the invention
The purpose of the application is to provide a kind of shielding band of double-sided insulation, not only shield effectiveness with higher, but also can keep away
Exempt to improve the anti-interference ability of UTP CAT.6A class cable using drain wire in cable.
To achieve the above object, the embodiment of the present application uses a kind of following technical scheme: unmasked cable, comprising: cable core,
The cable core includes conductor；Insulating layer, the insulating layer are arranged on the outside of the cable core；Shielded layer, the shielded layer are arranged in insulating layer
Outside, shielded layer include conductive layer and external insulation layer；Restrictive coating, the restrictive coating are arranged on the outside of shielded layer.
In the above-mentioned technical solutions, the application between shielded layer and cable core by being arranged a layer insulating, by shielded layer
The conductive layer of inside comes with cable core isolation, reduces conductive layer and interferes the charge of cable core, compared with existing FTP, does not need
Additional setting drain wire simultaneously carries out ground connection installation, has preferable shield effectiveness again compared with existing UTP.
Further, in the present embodiment, cable core further includes crossing skeleton, which is arranged in insulating layer.
Further, in the present embodiment, conductor spiral is twisted forms at least one set of twisted pair.
Further, in the present embodiment, inner insulating layer is enclosed on the outside of conductor.
Further, in the present embodiment, insulating layer is made of polyester material.
Further, in the present embodiment, insulating layer is film type.
Further, in the present embodiment, insulating layer is wrapped on the outside of cable core by the way of cladding or winding.
Further, in the present embodiment, conductive layer is made of metal foil.
Further, in the present embodiment, external insulation layer is made of plastic film.
In addition, the embodiment of the present application also uses following technical scheme: a kind of manufacturing method of unmasked cable, including it is following
Step:
Make twisted pair: by two conductor pair twists at twisted pair；
Production cable core: root twisted pair is mounted in the accommodating chamber of crossing skeleton by cable-former, cable core is made；
Addition insulating layer: PET film band is superscribed by way of spiral winding on the outside of cable core；
Addition shielded layer: band-like aluminium foil is superscribed by way of cladding on the outside of insulating layer；
Add restrictive coating.
Detailed description of the invention
The application is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is a kind of section structure diagram of unmasked cable provided by the embodiments of the present application.
Fig. 2 is the cutting plane schematic diagram of shielded layer in Fig. 1.
Fig. 3 is the result schematic diagram of the PSANEXT test of unmasked cable described in Fig. 1.
Fig. 4 is the result schematic diagram of the PSAACRF test of unmasked cable described in Fig. 1.
In attached drawing
10, cable core 101, crossing skeleton 102, accommodating chamber
103, twisted pair 104, conductor 105, inner insulating layer
20, shielded layer 201, conductive layer 202, external insulation layer
30, restrictive coating
40, insulating layer
Specific embodiment
The purpose of the present invention, technical solution are clearly and completely described and advantage is more clearly understood in order to make, with
The embodiment of the present invention is further elaborated in lower combination attached drawing.It should be appreciated that specific embodiment described herein is
A part of the embodiment of the present invention is only used to explain the embodiment of the present invention instead of all the embodiments, is not used to limit this
Inventive embodiments, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", " in " "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "inner", "outside", "top", "bottom", " side ", "vertical", "horizontal" is based on the figure
Orientation or positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device of indication or suggestion meaning or
Element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.This
Outside, term " one ", " first ", " second ", " third ", " the 4th ", " the 5th ", " the 6th " are used for description purposes only, and cannot manage
Solution is indication or suggestion relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
For concise and explanation purpose, the principle of embodiment is described by referring mainly to example.In the following description,
Many details are suggested to provide a thorough understanding of embodiments.It will however be evident that.For ordinary skill
Personnel, these embodiments can be not limited to these details in practice.In some instances, it does not describe in detail known
Method and structure, to avoid unnecessarily making these embodiments become difficult to understand.In addition, all embodiments can be combined with each other
It uses.
Fig. 1 is a kind of section structure diagram of unmasked cable provided by the embodiments of the present application；Fig. 2 is to shield in Fig. 1
The cutting plane schematic diagram of layer.With reference to Fig. 1 and Fig. 2, a kind of unmasked cable is present embodiments provided, from inside to outside successively includes cable
Core 10, shielded layer 20 and restrictive coating 30.Wherein, insulating layer 40 is provided between cable core 10 and shielded layer 20, insulating layer 40 is most
It is good to be made of nonconducting polyester material, such as polyethylene terephtalate, polyethylene naphthalate PEN, poly- third
The materials such as alkene PP, are embodied as PET material in the present embodiment.Insulating layer 40 is preferably film type, and thickness can be
0.02mm is specifically as follows PET film.
Insulating layer 40 is wrapped in 10 outside of cable core, specifically can be by the way of winding or cladding.In the present embodiment,
When insulating layer 40 using by PET film with spiral winding by the way of 10 outside of cable core is set when, PET film band the place of putting up weight
Folded, the part of overlapping is the first overlapping portion, and the first overlapping portion is screw type at this time；When insulating layer 40 is coated using PET film band
Mode when 10 outside of cable core is set, the place's of putting up overlapping of PET film band, the part of overlapping is the first overlapping portion, at this time the
One overlapping portion is linear type.Specifically in the present embodiment, the first overlapping portion accounts for 25% or more of the area of PET film band.
In addition, cable core 10 includes a crossing skeleton 101, insulating layer 40 is closely affixed with crossing skeleton 101, makes crossing skeleton
101 with accommodating chamber 102 that four relative closures are formed on the inside of insulating layer 40, twisted pair 103 is installed in the accommodating chamber 102, it is double
Twisted wire 103 is twisted by two 104 spirals of conductor, and inner insulating layer 105 is enclosed on the outside of conductor 104.Wherein, crossing skeleton
101 and inner insulating layer 105 be specifically made in the present embodiment of highdensity PE material, PE material has lower dielectric normal
Number, can prevent from interfering with each other between conductor 104, between twisted pair 103；Conductor 104 use 99.95% oxygen-free copper, have compared with
High conductivity.
The setting of insulating layer 40 so that the relative position of the component inside cable core 10 is more determining, different twisted pairs 103 it
Between contact condition it is also more stable, to reduce the generation of nonlinear contact, the possibility of the PIM of generation is reduced from source.It is excellent
Selection of land, insulating layer 40 are preferably wound around setting in 10 outside of cable core, and canoe more can tightly hold onto cable than cladding mode
Core 10, plays the role of limit.
Shielded layer 20 is double-layer structure, including conductive layer 201 and external insulation layer 202, conductive layer 201 inwardly, external insulation layer
202 outwardly, and conductive layer 201 is connected with external insulation layer 202 by viscose glue.Specifically, conductive layer 201 is metal foil layer, is preferably adopted
With aluminium foil or copper foil, the metal material of this low-resistance rate can generate electromagnetic eddy, form the counteracting to external electromagnetic wave and make
With to achieve the effect that shielding.External insulation layer 202 is all made of the plastic film with insulation performance, such as poly- terephthaldehyde
The films bands such as sour glycol ester PET, polyethylene naphthalate PEN, polypropylene PP specifically use PET in the present embodiment
Film band.Shielded layer 20 is preferably band-like, is specifically as follows band-like aluminium foil.
In addition to this, shielded layer 20 is also possible to three-decker, including conductive layer 201, external insulation layer 202, and in conduction
One layer of insulating materials is added in 201 inside of layer, to increase the shield effectiveness of shielded layer 20.The insulating materials can be using the side of covering
Formula setting can also be arranged by the way of smearing.
In the present embodiment, shielded layer 20 can be arranged in outside insulating layer 20 by the way of by band-like aluminium foil spiral winding
Side, and conductive layer 201 is contacted with insulating layer 20, the place's of putting up overlapping of band-like aluminium foil, the part of overlapping is the second overlapping portion, at this time
Second overlapping portion is screw type；20 outside of insulating layer can also be arranged in shielded layer 20 by the way of band-like aluminium foil cladding, and
Conductive layer 201 is contacted with insulating layer 20, and the place of putting up of band-like aluminium foil overlapping, the part of overlapping is the second overlapping portion, and at this time second
Overlapping portion is linear type.Specifically in the present embodiment, the second overlapping portion accounts for 25% or more of the area of band-like aluminium foil.
Restrictive coating 30 is made of the plastic material of insulation, preferably cylinder-shaped, internal to form hollow cavity, makes cable
Core 10, insulating layer 40 and shielded layer 20 can be founded and in restrictive coating 30, have the function of protecting cable cable core.
The present embodiment between shielded layer 20 and cable core 10 by being arranged a layer insulating 40, by leading for 20 inside of shielded layer
Electric layer 201 comes with the isolation of cable core 10, reduces conductive layer 201 and interferes the charge of cable core 10, compared with existing FTP, is not required to
Drain wire is additionally set and carries out ground connection installation, there is preferable shield effectiveness again compared with existing UTP.
The shield effectiveness test result of above-mentioned unmasked cable is as shown in Figure 3-4, is all satisfied cable key test parameter
The requirement of PSANEXT (comprehensive Alien Next power and) and PSAACRF (comprehensive outer distal end noise specific power and).
Secondly, the first overlapping portion and the second overlapping portion are not overlapped preferably for better shield effectiveness, prevent in the first weight
Electrostatic interference is generated at folded portion and the second overlapping portion.For the ease of production and processing, insulating layer 40 and shielded layer 20 can be using not
Same package mode keeps the first overlapping portion different with the shape of the second overlapping portion.For example, when the first overlapping portion is screw type,
Second overlapping portion can be linear type, ensure that the first overlapping portion and the second overlapping portion can never be overlapped in this way.
Due to being provided with shielded layer in unmasked cable, the anti-interference ability of unmasked cable is greatly promoted, is made
Make and use process in can not use interference protection measure in the prior art.For example, in the prior art, through frequently with by cable
Outer diameter does big mode to reduce the contact area between adjacent cables, and outer diameter all reaches 8-9mm substantially, but in the present embodiment
The outer diameter of cable can be done it is small, control in 7-7.5mm, save the installation space of cable.
Cable described in the present embodiment and existing UTP CAT.6A parameter comparison are as shown in table 2.
2 the present embodiment of table and UTP CAT.6A Contrast on effect table
Finally, in the present embodiment, also disclosing a kind of manufacturing method for manufacturing above-mentioned unmasked cable, including following step
It is rapid:
It makes twisted pair 103: preparing the raw material copper bar of conductor 104, wire drawing is carried out to copper bar, then in copper wire outer cladding
Insulating materials PE makes the outside of copper wire conductor 104 be enclosed with insulating layer 105；Then, by two conductors with insulating layer 105
104 pair twists are at twisted pair 103；
4 twisted pairs 103: being mounted in the accommodating chamber 102 of crossing skeleton 101 by production cable core 10 by cable-former, is made
At cable core 10；
Addition insulating layer 40: PET film band is superscribed by way of spiral winding in 10 outside of cable core, wherein spiral
The place's of putting up overlapping of winding, Duplication are more than or equal to 25%；
Addition shielded layer 20 and restrictive coating 30: superscribing band-like aluminium foil in 40 outside of insulating layer by way of cladding,
In, the Duplication of cladding is more than or equal to 25%, forms shielded layer 20；Finally, restrictive coating 3 is arranged in the outside of shielded layer 20.
Although the illustrative specific embodiment of the application is described above, in order to the technology of the art
Personnel are it will be appreciated that the application, but the application is not limited only to the range of specific embodiment, to the common skill of the art
For art personnel, as long as long as various change the attached claims limit and determine the application spirit and scope in, one
It cuts and is created using the application of the application design in the column of protection.
Claims (10)
1. a kind of unmasked cable, wherein the cable includes:
Cable core, the cable core include conductor；
Insulating layer, the insulating layer are arranged on the outside of the cable core；
Shielded layer, the shielded layer are arranged on the outside of the insulating layer, and the shielded layer includes conductive layer and external insulation layer；
Restrictive coating, the restrictive coating are arranged on the outside of the shielded layer.
2. a kind of unmasked cable according to claim 1, wherein the cable core further include:
Crossing skeleton, the crossing skeleton are arranged in the insulating layer.
3. a kind of unmasked cable according to claim 1, wherein the conductor spiral is twisted to form at least one set of multiple twin
Line.
4. a kind of unmasked cable according to claim 1, wherein be enclosed with inner insulating layer on the outside of the conductor.
5. a kind of unmasked cable according to claim 1, wherein the insulating layer is made of polyester material.
6. a kind of unmasked cable according to claim 1, wherein the insulating layer is film type.
7. a kind of unmasked cable according to claim 1, wherein the conductive layer is made of metal foil.
8. a kind of unmasked cable according to claim 1, wherein the external insulation layer is made of plastic film.
9. a kind of unmasked cable according to claim 1, wherein be provided with insulating materials on the inside of the conductive layer.
10. a kind of manufacturing method of unmasked cable, wherein the described method comprises the following steps:
Make twisted pair: by two conductor pair twists at twisted pair；
Production cable core: root twisted pair is mounted in the accommodating chamber of crossing skeleton by cable-former, cable core is made；
Addition insulating layer: PET film band is superscribed by way of spiral winding on the outside of cable core；
Addition shielded layer: band-like aluminium foil is superscribed by way of cladding on the outside of insulating layer；
Add restrictive coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910136425.8A CN109686490A (en) | 2019-02-25 | 2019-02-25 | A kind of unmasked cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910136425.8A CN109686490A (en) | 2019-02-25 | 2019-02-25 | A kind of unmasked cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109686490A true CN109686490A (en) | 2019-04-26 |
Family
ID=66196882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910136425.8A Pending CN109686490A (en) | 2019-02-25 | 2019-02-25 | A kind of unmasked cable |
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| Country | Link |
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| CN (1) | CN109686490A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111477410A (en) * | 2020-04-01 | 2020-07-31 | 嘉兴奥亿普数据电缆有限公司 | Manufacturing process of novel high-transmission-rate anti-aging data line |
| CN114743734A (en) * | 2022-05-10 | 2022-07-12 | 刘涛 | Twisted-pair cable and processing technology thereof |
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Cited By (3)
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| CN111477410A (en) * | 2020-04-01 | 2020-07-31 | 嘉兴奥亿普数据电缆有限公司 | Manufacturing process of novel high-transmission-rate anti-aging data line |
| CN114743734A (en) * | 2022-05-10 | 2022-07-12 | 刘涛 | Twisted-pair cable and processing technology thereof |
| CN114743734B (en) * | 2022-05-10 | 2023-09-22 | 四川莉丰电缆有限公司 | Twisted pair cable and processing technology thereof |
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