CN105551677A - Ultrahigh frequency digital communication cable and preparation method thereof - Google Patents
Ultrahigh frequency digital communication cable and preparation method thereof Download PDFInfo
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- CN105551677A CN105551677A CN201610088938.2A CN201610088938A CN105551677A CN 105551677 A CN105551677 A CN 105551677A CN 201610088938 A CN201610088938 A CN 201610088938A CN 105551677 A CN105551677 A CN 105551677A
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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
- H01B7/02—Disposition of insulation
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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
- H01B11/00—Communication cables or conductors
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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
- H01B11/005—Quad constructions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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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
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0225—Three or more layers
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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
- H01B7/02—Disposition of insulation
- H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
Abstract
The invention discloses an ultrahigh frequency digital communication cable. The cable comprises a cable core, a main shielding layer, an external protection layer and branch shielding layers on twisted pair wire groups; the overlapping sides of the branch shielding layers are clamped between two adjacent insulated single wires to form branch shielding overlapping wires; the branch shielding overlapping wires corresponding to two adjacent twisted pair wire groups are arranged in a staggered mode; the outwards stretching lengths of the overlapping outwards stretching sides of the branch shielding layers from the branch shielding overlapping wires are L1; and the outwards stretching lengths is 10 % -15 % of the widths of covering foil belts of the branch shielding layers. The preparation method of the invention comprises following steps: (1), drawing a copper conductor; (2), extruding an insulation layer; (3), twisting the twisted pair wire groups; (4), covering the branch shielding layers; (5), twisting into the cable; (6), weaving the main shielding layer; and (7), extruding the external protection layer to form the cable finished product. According to the cable and the method of the invention, the shielding effect is good; intrusion and leakage of electromagnetic waves are effectively prevented; the cable is firm in structure and stable in transmission performance and is especially applicable for transmitting ultrahigh frequency band digital signals.
Description
Technical field
The present invention relates to cable for digital communication, particularly relate to the telecommunication cable of the transmission superfrequency digital signals such as a kind of seven classes for the Internet, eight classes.
Background technology
Along with digital communications network is constantly to Large Copacity, high-frequency, two-forty depth future development, multiservice transport platform technology is also progressively ripe, and is promoted in metropolitan area network; The construction of " unification of three nets " communication network of China is just like a raging fire.The fast development of structured cabling system, make gigabit Ethernet can not meet consumer wideband requirement, ten thousand mbit ethernets will become mainstream technology.Corresponding cable for digital communication need from six classes, seven classes to the telecommunication cable production development of eight classes and more high-transmission frequency.
The raising of cable for digital communication operating frequency, mean and more easily produce electromagnetic radiation and electromagnetic coupled, also can constantly there is new electromagnetic interference source to produce in environment simultaneously, network operating frequencies higher generation electromagnetic radiation is also more serious, therefore there is the intrusion that the wide band cable for digital communication of high-frequency not only wants effectively to prevent outside electromagnetic interference signal, and do not allow the electromagnetic radiation from cable inside leak again, make it that there is extraordinary electromagnetic compatibility characteristic and confidentiality.
Existing seven classes or eight class cable for digital communication, by the twist balance of twisted-pair feeder and the shielding action of metal screen layer, prevent the intrusion of outside electromagnetic interference signal and the leaking of electromagnetic radiation from cable inside effectively.Four pairs of twisted pair wire unit of its shielded type cable are all used alone metallic shield, due to the kelvin effect of metal screen layer and reflection and absorption, separate the electromagnetic field of surrounding preferably and reduce individually shielded to the cross-talk between line.The insulated single wire of composition twisted pair wire have employed again the three-layer co-extruded insulating barrier of coated skin foam skin on copper conductor, and this structure makes mutual capacitance between line decline to a great extent, and transmission attenuation constant reduces, and has the technical performance of good carry high frequency digital signal.
Because layers of foil shielding has good flexibility, mechanical strength and insulation property, the twisted pair wire unit shielding of existing seven classes and eight class cable for digital communication mostly adopts shielding foil to indulge and is wrapped on twisted pair wire to form layers of foil shielding.But be in free overlap joint state because looping foil two overlaps side, be easy to form fold and dehisce, laminating contact that can not be reliable and tight, the lap gap of foil overlap edge also can be formed in the manufacture process of twisted pair wire unit, when digital cable more inevitably can strengthen lap gap laying in use, and at high frequencies, electromagnetic wave has again extremely strong penetration and radioactive force.The existence of this lap gap not only can make electromagnetic interference signal invade twisted pair wire unit from gap, and the electromagnetic signal of twisted pair wire unit inside also can leak in radiation.This is fatal often to having high operate frequency, the electrical property of wide band digital signal cable and Signal transmissions safety.Therefore the electromagnetic wave how solved under twisted pair wire unit radioshielding condition invades and radiation leaks, and becomes the striving direction of those skilled in the art.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of superfrequency cable for digital communication, and this cable for digital communication can ensure that the shielding foil overlap joint side of its vertical bag is fitted solid and reliablely, thus effectively prevents electromagnetic intrusion and leak.The technical problem that another will solve of the present invention is to provide a kind of method manufacturing this superfrequency cable for digital communication.
In order to solve the problems of the technologies described above, superfrequency cable for digital communication of the present invention, comprise cable core and be coated on the total screen on cable core, total screen is coated with outer jacket, described cable core forms by the four pairs of twisted pair wire groups are stranded, each twisted pair wire group forms by two insulated single wires are stranded, and insulated single wire includes copper conductor and from inner outwards coated successively solid endodermis, intermediate foam layers and solid exodermis; All be coated with sub-shield outward in each twisted pair wire group, this sub-shield overlap joint side is held between adjacent two insulated single wires and forms the superimposed line of separated-shielding, and the superimposed line of this separated-shielding is identical with twisting pitch with the direction of lay of cable core; The superimposed line of separated-shielding corresponding to adjacent two pairs of twisted pair wire groups staggers setting mutually; The overhanging side of overlap joint of sub-shield is L1 from the protruding length of the superimposed line of separated-shielding, this L1 is 10% ~ 15% of the coated foil width of sub-shield, stretching side in the overlap joint of sub-shield from development length in the superimposed alignment of separated-shielding is L2, and this L2 is 20% ~ 25% of the coated foil width of sub-shield.
As a kind of preferred implementation of the present invention, the angle that the superimposed line of separated-shielding corresponding to described adjacent two twisted pair wire groups mutually staggers in cable cross-section is 80 ° ~ 100 °.
As another preferred implementation of the present invention, the direction of lay of four pairs of twisted pair wire groups of described cable core is identical, and the twisting pitch of these four pairs of twisted pair wire groups is unequal.
As another preferred implementation of the present invention, described total screen is netted woven shield.Gasket for packing is had at four pairs of twisted pair wire group central filler.
The preparation method of superfrequency cable for digital communication of the present invention, this preparation method comprises the steps:
(1), copper conductor is drawn: solid annealed copper wire is drawn into the circular copper conductors that diameter is 0.580mm ± 0.001mm, and the percentage elongation of this copper conductor is 24.5% ± 1.5%;
(2), extruded insulation layer: in circular copper conductors simultaneously co-extrusion three-decker insulating barrier and form insulated single wire, insulating barrier is outwards followed successively by solid endodermis, intermediate foam layers and solid exodermis from inner, insulating barrier gross thickness is 0.41mm ± 0.03mm, and wherein intermediate foam layers thickness is 0.31mm ± 0.03mm; The concentricity of insulated single wire is greater than 99%, and the ovality of insulated single wire is less than 0.005mm;
(3), stranded twisted pair wire group: insulated single wire is twisted into four pairs of twisted pair wire groups between two mutually, and the direction of lay of these four pairs of twisted pair wire groups is identical, and the twisting pitch of four pairs of pair twist zygonema groups is respectively 18.5mm, 21mm, 22.8mm and 24mm;
(4), coated sub-shield: adopt coating mould to be coated in twisted pair wire group copper foil tape or aluminium foil strip and form sub-shield, the overlapped overlap joint of sub-shield foil dual-side;
(5), twisted synthesizing cable: be twisted into cable core by four to the twisted pair wire group being coated with sub-shield, the twisting pitch of cable core is 80mm ± 5mm; After cable core is stranded, the sub-shield overlap joint side of each twisted pair wire group is held between adjacent two insulated single wires and forms the superimposed line of separated-shielding, and the superimposed line of this separated-shielding is identical with twisting pitch with the direction of lay of cable core; The superimposed line of separated-shielding corresponding to adjacent two pairs of twisted pair wire groups staggers setting mutually; The overhanging side of overlap joint of sub-shield is L1 from the protruding length of the superimposed line of separated-shielding, this L1 controls for the coated foil width of sub-shield 10% ~ 15%, stretching side in the overlap joint of sub-shield from development length in the superimposed alignment of separated-shielding is L2, and this L2 controls for the coated foil width of sub-shield 20% ~ 25%; Gasket for packing is had at the central filler of four pairs of twisted pair wire groups;
(6), braided overall-shielding layer: outer with the total screen of metal wire knitted at cable core;
(7) on total screen, extrude outer jacket form cable finished product.
The further execution mode of preparation method of the present invention, the foam degrees of described middle level froth bed is 44% ~ 50%, and the percentage elongation of insulating barrier is 400%, and the tensile strength of insulating barrier is 12MPa, and the adhesion of solid endodermis and copper conductor is 6N/ ㎜ 2 ~ 12N/ ㎜ 2.
The further again execution mode of preparation method of the present invention, the superimposed line of separated-shielding corresponding to described adjacent two twisted pair wire groups mutually staggers 90 ° in cable cross-section.
The further again execution mode of preparation method of the present invention, described total screen is woven by tinned copper wire and forms.Described outer jacket is that low smoke and zero halogen protective cover material extrudes layer, and this thickness extruding layer is 0.55mm ± 0.1mm.
In the present invention, be held between adjacent two insulated single wires because sub-shield two overlaps side and define the superimposed line of separated-shielding, the superimposed line of this separated-shielding is identical with twisting pitch with the direction of lay of cable core just at the right time again, the locking phase strand of such foil and cable core makes the overlap joint side of separated-shielding foil be held between two adjacent insulated single wires all the time, make on the one hand the longitudinal side of two of foil overlap joints all the time reliably and overlapped laminating closely, avoid foil overlap joint side fold to dehisce and the existence contacting gap, electromagnetic interference signal is not only effectively stoped to invade twisted pair wire unit from lap gap, also the radiation of twisted pair wire unit internal electrical magnetic signal is avoided to leak, there is more tight shield effectiveness reliably, on the other hand insulated single wire is crimped on overlapping foil overlap joint side, also significantly reduces the contact stress between insulated single wire, decreases the crimp at insulated single wire contact wire place, ensure better cable core structure and cable resistance uniform and stable.The superimposed line of separated-shielding again corresponding to adjacent two pairs of twisted pair wire groups staggers setting mutually, this structure makes adjacent two insulated single wires only tightly clamp the lap-joint of a separated-shielding foil, chucking power is reliable and stable, guarantee that foil lap-joint can not form lap gap, this structure is also convenient to the design shielding foil looping technology controlling and process and mould, foil side is avoided to occur fold, to ensure shield effectiveness and transmission performance.Also because the overhanging side of overlap joint of sub-shield is L1 from the protruding length of the superimposed line of separated-shielding, this L1 is 10% ~ 15% of the coated foil width of sub-shield, stretching side in the overlap joint of sub-shield from development length in the superimposed alignment of separated-shielding is L2, and this L2 is 20% ~ 25% of the coated foil width of sub-shield; This not only ensures that foil looping is tight, avoids bottom pour ladle, and enough foil lap widths can ensure that adjacent two insulated single wires are clamped on foil overlap joint side all the time, make overlap joint side secure fit all the time.Insulating barrier in the present invention outside copper conductor adopts solid endodermis, the three-layer insulated structure of intermediate foam layers and solid exodermis, mutual capacitance between insulated single wire is declined to a great extent, thus transmission attenuation constant is reduced, have employed again the dual shield structure of separated-shielding and total shielding on this basis, make cable have the comprehensive shielded effect of anti-inside and outside portion electromagnetic interference preferably.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the cross-sectional structure schematic diagram of a kind of embodiment of superfrequency cable for digital communication of the present invention;
Fig. 2 is the structure for amplifying schematic diagram of twisted pair wire group in structure shown in Fig. 1.
In figure, 1-copper conductor, 2-single line insulating barrier, 3-twisted pair wire group, 4-sub-shield, 5-gasket for packing, 6-always screen, 7-outer jacket, the superimposed line of 8-separated-shielding, 21-solid endodermis, 22-middle level froth bed, 23-solid exodermis.
Embodiment
Superfrequency cable for digital communication as shown in Figure 1, the cable core of this cable is coated with total screen 6, and total screen 6 adopts 96 diameters to be that the tinned copper wire of 0.1mm carries out interlacing and forms, and its percentage of braiding coverage reaches 60%, and lay of braiding is 28mm.Total screen 6 is extruded with the outer jacket 7 that low-smoke halogen-free cable protective cover material is formed, and the wall thickness control of this outer jacket 7 is at 0.55 ± 0.1mm, and the outside diameter of cable after coated outer jacket is not more than 8.20mm.The cable core of cable forms by the four pairs of twisted pair wire groups 3 are stranded, every a pair twisted pair wire group 3 forms by two insulated single wires are stranded again, sub-shield 4 is had in the outer all loopings of every a pair twisted pair wire group 3, the aluminium foil strip looping that this sub-shield 4 merges aluminium lamination by polyester film and forms forms, and this sub-shield 4 also can be formed by copper aluminium foil strip.Be filled with gasket for packing 5 in the centre position of four pairs of twisted pair wire groups 3, gasket for packing 5 adopts the gasket for packing of the conventional nonmetallic materials such as propylene rope, the rope made of hemp.
The aluminium foil strip dual-side forming sub-shield 4 overlaps mutually, overlap is held between two adjacent insulated single wires, this two eradications edge single line clamps foil overlap and defines the superimposed line 8 of separated-shielding, and stranding is stranded and the superimposed line of separated-shielding 8 that is that formed has identical direction of lay and twisting pitch with cable core.
In order to avoid sub-shield 4 overlap of each pair of twisted pair wire group 3 correspondence and the coincidence of separated-shielding superimposed line 8 position, and cause the deficiency of chucking power, and be easy to form overlap fold, the superimposed line 8 of separated-shielding corresponding to adjacent two pairs of twisted pair wire groups 3 staggers setting mutually, the angle that it staggers in cable cross-section is 90 °, and offset angular is preferably between 80 °-100 °; This offset angular is by the angle between the radius of the superimposed line 8 of separated-shielding on the cross section of two neighboring twisted pairs component screen place circles.
As shown in Figure 2, the looping aluminium foil strip thickness of sub-shield 4 is 0.07mmm, spreading width B=15mm, the overhanging side of sub-shield 4 overlap is L1 from the protruding length of the superimposed line of separated-shielding 8, the length of L1 should control into sub-shield 4 looping foil spreading width 10%-15%, the side that extends internally of sub-shield 4 is L2 from the superimposed line 8 of the separated-shielding length that extends internally, the length of this L2 is that 20%-25%, extension L1 and interior elongatedness L2 of sub-shield 4 looping foil spreading width ensure that aluminium foil strip has suitable coated Duplication.
Insulated single wire includes copper conductor 1, and from inner outwards coated successively solid endodermis 21, intermediate foam layers 22 and solid exodermis 23, copper conductor 1 adopts solid annealed copper wire to draw and forms.The direction of lay forming four pairs of twisted pair wire groups 3 of cable core is identical, in the present embodiment the direction of lay of twisted pair wire group be S to, its twisting pitch is different, but difference all controls within the specific limits, and the pitch of each twisted pair wire group is followed successively by 18.5mm, 21mm, 22.8mm and 24mm.The twisting pitch of cable core is 80 ± 5mm, stranding direction of lay be also S to.
The present invention prepares the method for superfrequency cable for digital communication, comprises the steps:
(1) draw copper conductor, solid annealed copper wire is pulled into any surface finish, the diameter of rounding is the round conductor of 0.580mm ± 0.001mm, the percentage elongation of this copper conductor is 24.5% ± 1.5%.
(2) the insulation extrusion machine with three layers of simultaneously co-extrusion function is sent at the copper conductor of above-mentioned drawing, this extruder is to the equal heating and melting of three-layer insulated material and form the three-layer insulated layer of solid endodermis, intermediate foam layers and solid exodermis from the inside to surface outward at conductor, the gross thickness of insulating barrier is 0.41mm ± 0.03mm, and wherein intermediate foam layers thickness is 0.31mm ± 0.03mm.Solid endodermis adopts low density polyethylene (LDPE) Insulation Material, to strengthen the adhesion between conductor and insulating barrier, the foamed material that intermediate foam layers adopts low density polyethylene (LDPE), high density polyethylene (HDPE) and nucleator to combine, by small-sized gas injection pin high pressure nitrogen sent in the middle part of screw rod again and do mutually to carry out physical blowing with foam insulating material, the online foam degrees of intermediate foam layers controls between 44%-50%, to ensure that abscess is fine and closely woven, even.Solid exodermis adopts high-density polyethylene material to improve the intensity of insulated single wire, makes insulating barrier tensile strength reach more than 12MPa.Insulating barrier percentage elongation is more than 300%, and the adhesion between insulating barrier and copper conductor controls at 6-12N/mm
2, the concentricity of insulated single wire controls more than 99%, and the ovality of insulated single wire is less than 0.005mm.
(3) stranded twisted pair wire group, eight insulated single wires are mutually stranded between two and be twisted into four pairs of twisted pair wire groups, the direction of lay of these four pairs of twisted pair wires is identical be S to, adopt rational pitch pair twist, and pitch difference is less, can distortion of the cable be reduced, ensure cable crosstalk and echo stable performance.In this example, the twisting pitch of four pairs of twisted pair wire groups is respectively 18.5mm, 21mm, 22.8mm and 24mm.For reducing the crimp at the stranded contact point place of insulated single wire, except by except the overlap joint side gripper of separated-shielding foil is between two insulated single wires, also need to keep pair twist uniform tension in order, to reduce resistance, capacity unmbalance value as far as possible; Twist and can improve to back twist the impedance fluctuations etc. caused because single line is eccentric or wire diameter is uneven, make transmission performance more stable.According to twisting pitch size, control between 30%-35% by back twist rate, strict laying tension and the takeup tension controlling single line, laying tension controls between 800CN ± 20CN, takeup tension controls as between 16N ± 1N, and twisting pitch deviation is no more than ± 0.03mm.
(4) coated sub-shield, by specification be 0.07 × 15mm single-face polyester film aluminium foil strip adopt particular manufacturing craft respectively longitudinal looping is carried out to four pairs of twisted pair wire groups, time coated, aluminium foil surface outwardly, and aluminium foil strip is wrapped in twisted pair wire group and forms sub-shield, sub-shield foil dual-side overlap overlap joint.After stranding, the twisting pitch of aluminium foil strip in twisted pair wire group is identical with cable core with direction.
(5) twisted synthesizing cable, is twisted into cable core by four to the twisted pair wire group being coated with sub-shield, has gasket for packing at the central filler of four pairs of twisted pair wire groups, and this gasket for packing adopts diameter to be the polypropylene rope of 1.3mm.The stranding twisting pitch of cable core is 80mm ± 5mm, stranding direction of lay be also S to, takeup tension controls as 90N ± 5N.The sub-shield overlap joint side of the stranded rear every a pair twisted pair wire group of cable core is held between adjacent two insulated single wires and forms the superimposed line of separated-shielding, insulated single wire clamping contact is on the overlap joint side of sub-shield, not only avoid the fold of overlap joint side and open gap, and the mutual extruding force decreased between adjacent insulated single wire, the electric capacity avoiding insulated single wire crimp to bring, resistance are unbalanced; The superimposed line of separated-shielding corresponding to adjacent two pairs of twisted pair wire groups staggers setting mutually.Be respectively the overhanging side of separated-shielding overlap joint foil in the both sides of the superimposed line of separated-shielding and interiorly stretch side, the length of inside stretching side is greater than the length of outer side edges, the overhanging side of overlap joint of sub-shield is L1 from the protruding length of the superimposed line of separated-shielding, this L1 controls for the coated foil width of sub-shield 10% ~ 15%, stretching side in the overlap joint of sub-shield from development length in the superimposed alignment of separated-shielding is L2, this L2 controls for the coated foil width of sub-shield 20% ~ 25%, and the superimposed line of separated-shielding is all identical with twisting pitch with the direction of lay of cable core.
(6) braided overall-shielding layer, shielding braid machine adopts the tinned copper wire of 96 diameter 0.1mm in the outer braided overall-shielding layer of cable core, its woven shield coverage rate reaches 60%, and lay of braiding is 28mm.
(7) adopt low-smoke halogen-free cable protective cover material to extrude outer jacket in total screen periphery, the wall thickness of outer jacket is 0.55mm ± 0.1mm, and the outside diameter of cable after coated outer jacket is 8.2mm.
Claims (10)
1. a superfrequency cable for digital communication, comprise cable core and be coated on the total screen (6) on cable core, total screen (6) is coated with outer jacket (7), described cable core forms by the four pairs of twisted pair wire groups (3) are stranded, each twisted pair wire group (3) forms by two insulated single wires are stranded, and insulated single wire includes copper conductor (1) and from inner outwards coated successively solid endodermis (21), intermediate foam layers (22) and solid exodermis (23); Sub-shield (4) is all coated with outward in each twisted pair wire group (3), it is characterized in that: this sub-shield (4) overlap joint side is held between adjacent two insulated single wires and forms the superimposed line of separated-shielding (8), and the superimposed line of this separated-shielding (8) is identical with twisting pitch with the direction of lay of cable core; The superimposed line of separated-shielding (8) corresponding to adjacent two pairs of twisted pair wire groups (3) staggers setting mutually; The overhanging side of overlap joint of sub-shield (4) is L1 from the superimposed line of separated-shielding (8) protruding length, this L1 is 10% ~ 15% of the coated foil width of sub-shield (4), stretching side in the overlap joint of sub-shield (4) from the superimposed line of separated-shielding (8) length that extends internally is L2, and this L2 is 20% ~ 25% of the coated foil width of sub-shield (4).
2. superfrequency cable for digital communication according to claim 1, is characterized in that: the angle that the superimposed line of separated-shielding (8) corresponding to described adjacent two twisted pair wire groups (3) mutually staggers in cable cross-section is 80 ° ~ 100 °.
3. superfrequency cable for digital communication according to claim 1, is characterized in that: described total screen (6) is netted woven shield.
4. superfrequency cable for digital communication according to claim 1, is characterized in that: the direction of lay of four pairs of twisted pair wire groups (3) of described cable core is identical, and the twisting pitch of these four pairs of twisted pair wire groups (3) is unequal.
5. superfrequency cable for digital communication according to claim 1, is characterized in that: have gasket for packing (5) at four pairs of twisted pair wire group (3) central filler.
6. prepare a method for superfrequency cable for digital communication described in claim 1, it is characterized in that: this preparation method comprises the steps:
(1), copper conductor is drawn: solid annealed copper wire is drawn into the circular copper conductors that diameter is 0.580mm ± 0.001mm, and the percentage elongation of this copper conductor is 24.5% ± 1.5%;
(2), extruded insulation layer: in circular copper conductors simultaneously co-extrusion three-decker insulating barrier and form insulated single wire, insulating barrier is outwards followed successively by solid endodermis, intermediate foam layers and solid exodermis from inner, insulating barrier gross thickness is 0.41mm ± 0.03mm, and wherein intermediate foam layers thickness is 0.31mm ± 0.03mm; The concentricity of insulated single wire is greater than 99%, and the ovality of insulated single wire is less than 0.005mm;
(3), stranded twisted pair wire group: insulated single wire is twisted into four pairs of twisted pair wire groups between two mutually, and the direction of lay of these four pairs of twisted pair wire groups is identical, and the twisting pitch of four pairs of twisted pair wire groups is respectively 18.5mm, 21mm, 22.8mm and 24mm;
(4), coated sub-shield: adopt coating mould to be coated in twisted pair wire group copper foil tape or aluminium foil strip and form sub-shield, the overlapped overlap joint of sub-shield foil dual-side;
(5), twisted synthesizing cable: be twisted into cable core by four to the twisted pair wire group being coated with sub-shield, the twisting pitch of cable core is 80mm ± 5mm; After cable core is stranded, the sub-shield overlap joint side of each twisted pair wire group is held between adjacent two insulated single wires and forms the superimposed line of separated-shielding, and the superimposed line of this separated-shielding is identical with twisting pitch with the direction of lay of cable core; The superimposed line of separated-shielding corresponding to adjacent two pairs of twisted pair wire groups staggers setting mutually; The overhanging side of overlap joint of sub-shield is L1 from the protruding length of the superimposed line of separated-shielding, this L1 controls for the coated foil width of sub-shield 10% ~ 15%, stretching side in the overlap joint of sub-shield from development length in the superimposed alignment of separated-shielding is L2, and this L2 controls for the coated foil width of sub-shield 20% ~ 25%; Gasket for packing is had at the central filler of four pairs of twisted pair wire groups;
(6), braided overall-shielding layer: outer with the total screen of metal wire knitted at cable core;
(7) on total screen, extrude outer jacket form cable finished product.
7. preparation method according to claim 6, is characterized in that: the foam degrees of described middle level froth bed is 44% ~ 50%, and the percentage elongation of insulating barrier is 400%, and the tensile strength of insulating barrier is 12MPa, and the adhesion of solid endodermis and copper conductor is 6N/ ㎜
2~ 12N/ ㎜
2.
8. preparation method according to claim 6, is characterized in that: the superimposed line of separated-shielding corresponding to described adjacent two twisted pair wire groups mutually staggers 90 ° in cable cross-section.
9. preparation method according to claim 6, is characterized in that: described total screen is woven by tinned copper wire and forms.
10. preparation method according to claim 6, is characterized in that: described outer jacket is that low smoke and zero halogen protective cover material extrudes layer, and this thickness extruding layer is 0.55mm ± 0.1mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610088938.2A CN105551677B (en) | 2016-02-18 | 2016-02-18 | Superfrequency cable for digital communication and preparation method thereof |
| PCT/CN2016/104804 WO2017140129A1 (en) | 2016-02-18 | 2016-11-06 | Ultra-high frequency digital communication cable and preparation method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610088938.2A CN105551677B (en) | 2016-02-18 | 2016-02-18 | Superfrequency cable for digital communication and preparation method thereof |
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| CN105551677A true CN105551677A (en) | 2016-05-04 |
| CN105551677B CN105551677B (en) | 2016-11-30 |
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| CN106098211A (en) * | 2016-08-24 | 2016-11-09 | 成都大唐线缆有限公司 | A kind of star quad stranding balanced cable |
| WO2017140129A1 (en) * | 2016-02-18 | 2017-08-24 | 江苏东强股份有限公司 | Ultra-high frequency digital communication cable and preparation method therefor |
| CN107230525A (en) * | 2017-07-22 | 2017-10-03 | 江苏东强股份有限公司 | Hyperfrequency cable for digital communication and preparation method thereof |
| CN109243686A (en) * | 2018-11-25 | 2019-01-18 | 江苏东强股份有限公司 | Communication cable with low dielectric constant insulation structure |
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| WO2017140129A1 (en) * | 2016-02-18 | 2017-08-24 | 江苏东强股份有限公司 | Ultra-high frequency digital communication cable and preparation method therefor |
| CN106098211A (en) * | 2016-08-24 | 2016-11-09 | 成都大唐线缆有限公司 | A kind of star quad stranding balanced cable |
| CN107230525A (en) * | 2017-07-22 | 2017-10-03 | 江苏东强股份有限公司 | Hyperfrequency cable for digital communication and preparation method thereof |
| CN107230525B (en) * | 2017-07-22 | 2022-10-28 | 江苏东强股份有限公司 | Ultrahigh frequency digital communication cable and preparation method thereof |
| CN110136885A (en) * | 2018-02-08 | 2019-08-16 | 深圳市秋叶原实业有限公司 | A kind of production technology of cable |
| CN109243686A (en) * | 2018-11-25 | 2019-01-18 | 江苏东强股份有限公司 | Communication cable with low dielectric constant insulation structure |
| CN109411126A (en) * | 2018-11-29 | 2019-03-01 | 广州宇洪科技股份有限公司 | 5G intelligent wiring system high-frequency digital communication cable and its manufacturing method |
| CN110033898A (en) * | 2019-02-18 | 2019-07-19 | 济宁市海富电子科技有限公司 | A kind of HDMI cable |
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| CN115023772A (en) * | 2020-01-24 | 2022-09-06 | 昭和电线电缆系统株式会社 | Communication cable and method for manufacturing the same |
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| WO2017140129A1 (en) | 2017-08-24 |
| CN105551677B (en) | 2016-11-30 |
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