CN217521773U - Special bus cable - Google Patents
Special bus cable Download PDFInfo
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- CN217521773U CN217521773U CN202221294345.9U CN202221294345U CN217521773U CN 217521773 U CN217521773 U CN 217521773U CN 202221294345 U CN202221294345 U CN 202221294345U CN 217521773 U CN217521773 U CN 217521773U
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Abstract
The utility model discloses a special bus cable, include: the cable core has a shielding function; a metal plastic composite moisture barrier layer; the outer protective sleeve is arranged around the metal plastic composite moisture barrier layer; the cable core with shielding effect includes: a conductor; a first insulating layer covering the conductor; a second insulating layer coated on the first insulating layer; and a first shielding layer for shielding electromagnetic signals, the first shielding layer being disposed on the second insulating layer. The metal plastic composite moisture barrier layer is covered on the first shielding layer. The utility model discloses guaranteeing to possess the humidity resistance, having strengthened the transmission performance of signal simultaneously.
Description
Technical Field
The utility model relates to the technical field of cables, concretely relates to special bus cable.
Background
When the cable is buried underground, the moisture-proof and waterproof performance of the cable needs to be considered preferentially, and particularly in tropical and subtropical regions at low latitudes, the cable has high precipitation and high underground water level. It is particularly important that the cable is moisture and water resistant. Once the cable enters water, the normal operation of the cable is greatly influenced. After the water enters the cable, metal corrosion in the cable can be caused, the insulating electrical performance is seriously reduced, the performance is reduced if the performance is light, and the cable is scrapped if the performance is heavy.
CN111370176A discloses a dampproofing cable, this kind of dampproofing cable utilize the inflation material that absorbs water to extrude dampproofing pipeline with water, utilize first annular iron core, second annular iron core, separate permanent magnetism ring, shielding ring's effect in addition to make first annular iron core, second annular iron core reciprocating motion in dampproofing pipeline down, further extrude the moisture in the dampproofing pipeline, avoid inside steam gets into the cable, cause the condition of damage.
Obviously, the moisture-proof cable with the structure has the defects of complex structure, heavy weight, poor bending performance, difficult manufacture, high cost and low practicability.
According to the knowledge of the applicant, the existing underground moisture-proof and waterproof cable appearing on the market adopts a metal inner sheath such as an aluminum sheath or a lead sheath structure as a moisture-proof layer, however, as the metal inner sheath is positioned between the outer sheath and the cable core wrapping tape, once the outer sheath is damaged, the metal inner sheath is corroded and oxidized in the environment and easily pollutes soil and underground water.
In addition, most bus cables in the prior art are often provided with only one layer of shielding, which has poor electromagnetic interference shielding performance, and the characteristic impedance of the cable core cannot be controlled in a proper range, which causes the reduction of signal transmission performance of the bus cable.
SUMMERY OF THE UTILITY MODEL
The utility model provides a special bus cable, the utility model discloses guaranteeing to possess the humidity resistance, strengthened the transmission performance of signal simultaneously.
The technical scheme for solving the technical problems is as follows:
a specialty bus cable comprising:
the cable core has a shielding function;
a metal plastic composite moisture barrier layer;
the outer protective sleeve is arranged around the metal plastic composite moisture barrier layer;
the cable core with shielding effect includes:
a conductor;
a first insulating layer overlying the conductor;
a second insulating layer for controlling the characteristic impedance of the cable core, the second insulating layer being coated on the first insulating layer;
and a first shielding layer for shielding electromagnetic signals, the first shielding layer being disposed on the second insulating layer.
The metal plastic composite moisture barrier layer is covered on the first shielding layer.
The utility model discloses a metal plastic composite moisture barrier that sets up, this kind of material has played damp-proofing effect effectively owing to be the composite construction of metal and plastics. In addition, the aluminum-plastic composite belt in the metal-plastic composite moisture barrier layer has a shielding effect on high-frequency electromagnetic interference signals, and the first shielding layer formed by the tinned copper wire has a shielding effect on low-frequency electromagnetic interference signals, so that the high-frequency electromagnetic interference signals and the low-frequency electromagnetic interference signals are respectively shielded by the aluminum-plastic composite belt and the first shielding layer. In addition, the first insulating layer and the second insulating layer are coated outside the conductor, and the second insulating layer is made of foamed polyolefin, so that the characteristic impedance of the cable core can be controlled within a required range by controlling the foaming degree of the second insulating layer during extrusion molding. Therefore, the utility model discloses based on shielding and control characteristic impedance to the electromagnetic interference signal, make bus cable's signal transmission ability obtain the assurance.
Drawings
Fig. 1 is a schematic view of an embodiment of a moisture resistant cable of the present invention;
FIG. 2 is a structural view of a metal plastic composite moisture barrier;
FIG. 3 is a schematic view of a first extrusion die in cooperation with a cooling device;
FIG. 4 is a schematic view of a second screw within a second extrusion die;
reference numbers in the drawings:
the cable comprises a conductor 101, a first insulating layer 102, a second insulating layer 103, a first shielding layer 104, an aluminum-plastic composite tape wrapping layer 105, a high-density polyethylene extrusion layer 106, a nylon extrusion layer 107 and an outer sheath 108;
the device comprises a hopper 1, a first extrusion die 2, a vacuum pump 3, a first water tank 4, a water circulation mechanism 5, an active agent filling device 6 and a second water tank 7;
a feeding section 11, a plasticizing section 12 and a homogenizing section 13.
Detailed Description
As shown in fig. 1, the special bus cable of the present invention includes a cable core with shielding effect, a metal plastic composite moisture barrier layer, and an outer protective sheath, wherein the outer protective sheath is disposed around the metal plastic composite moisture barrier layer; the cable core with the shielding effect comprises a conductor 101, a first insulating layer 102, a second insulating layer 103 and a first shielding layer 104, wherein:
the first insulating layer 102 is coated on the conductor 101, the material of the first insulating layer 102 is crosslinked polyethylene, the first insulating layer 102 is coated on the conductor 101 by extrusion molding, the second insulating layer 103 is coated on the first insulating layer 102, the material of the second insulating layer 103 is foamed polyolefin, the second insulating layer 103 is coated on the first insulating layer 102 by extrusion molding, and the characteristic impedance of the cable core can be controlled within a required range by controlling the foaming degree of the second insulating layer 103 during extrusion molding, for example, the characteristic impedance of the cable core is controlled at 130-.
The first shielding layer 104 shields electromagnetic signals, and the first shielding layer 104 is wrapped on the second insulating layer 103. The first shielding layer 104 is made of a tinned copper wire, and the tinned copper wire is wrapped on the second insulating layer 103 in a weaving manner. The metal plastic composite moisture barrier is wrapped over the first shield layer 104.
The metal plastic composite moisture-proof layer comprises an aluminum plastic composite tape wrapping layer 105, a high-density polyethylene extrusion wrapping layer 106 and a nylon extrusion wrapping layer 107, the aluminum plastic composite tape wrapping layer 105 is wrapped on the cable core, the aluminum plastic composite tape wrapping layer 105 is composed of a plastic film and an aluminum foil, and when the aluminum plastic composite tape wrapping layer 105 is wrapped, the plastic film faces inwards and the aluminum foil faces outwards; the high-density polyethylene extrusion layer 106 is integrated with the aluminum foil in an extrusion and extrusion way; nylon extrusion layer 107 is extrusion-integrated with high density polyethylene extrusion layer 106.
The utility model discloses a special bus cable's preparation process does:
s1, preparing a cable core;
s2, arranging the metal plastic composite moisture barrier layer on the cable core;
and S3, arranging an outer protective sleeve around the metal plastic composite moisture barrier.
Each step is explained below:
as shown in fig. 1, the preparation of the cable core in step S1 includes the following processes:
s11, wrapping the first insulating layer 102 on the conductor 101 to form a wire core; the first insulating layer 102 is extrusion coated on the conductor 101 through an extrusion die.
And S12, coating the second insulating layer 103 on the wire core, and coating the second insulating layer 103 on the second insulating layer 103 in an extrusion mode through an extrusion die.
S13, wrapping the first shielding layer 104 on the second insulating layer 103.
As shown in fig. 1 to 3, the metal plastic composite moisture barrier in step S2 is prepared by the following steps:
s21, wrapping the aluminum-plastic composite tape wrapping layer 105 on the cable core, namely wrapping the aluminum-plastic composite tape wrapping layer 105 on the shielding layer 104 in the cable core, wherein the aluminum-plastic composite tape wrapping layer 105 is composed of a plastic film and an aluminum foil, when the aluminum-plastic composite tape wrapping layer 105 is wrapped, the plastic film faces inwards and the aluminum foil faces outwards, the thickness of the aluminum foil is 0.04-0.06mm, and the thickness of the aluminum foil is preferably 0.05 mm.
The single-sided aluminum-plastic composite belt is used as a metal plastic composite moisture-proof layer and needs to be longitudinally wrapped or wrapped, and then is directly and thermally melted together at high temperature and high pressure through a first extrusion die in an extrusion type extrusion method, so that the requirement on the bonding strength of the metal plastic composite moisture-proof layer can be met.
S22, adding the high density polyethylene into the first extrusion die 2 through the hopper 1, and melting the high density polyethylene and the aluminum foil into a whole through the first extrusion die 2 in an extrusion manner, so as to form the high density polyethylene extrusion coating 106 on the outer circumferential surface of the aluminum-plastic composite tape wrapping layer 105. In this example, the density is 0.96-0.98g/cm 3 As high density polyethylene (density less than 0.94 g/cm) 3 Has a low density of 0.94-0.96g/cm 3 Medium density), the high density polyethylene extrusion coating 106 protects the aluminum foil from corrosion or damage, so that the hot-melted structure can replace the traditional metal sheath lining layer structure, and underground water and soil can be effectively protected from pollution.
To the crowded covering 106 of high density polyethylene in this embodiment adopts the extrusion mode of extrusion formula, the extrusion formula can provide high density polyethylene and aluminium-plastic composite tape on the one hand around covering 105 sufficient pressure and temperature of hot melt bonding, on the other hand can guarantee that the cable core is round, extrude for subsequent crowded covering 107 of nylon and provide convenience.
As shown in fig. 1 to 3, in step S22, the first extrusion die 2 is evacuated, for example, the first extrusion die 2 is evacuated by the evacuation pump 3, and the evacuation of the first extrusion die 2 has the following effects:
air between the aluminum-plastic composite tape wrapping layer 105 and the high-density polyethylene extrusion coating layer 106 is eliminated, bubbles are prevented from being formed between the aluminum-plastic composite tape wrapping layer 105 and the high-density polyethylene extrusion coating layer 106, and the attaching degree of the aluminum-plastic composite tape wrapping layer 105 and the high-density polyethylene extrusion coating layer 106 is improved.
As shown in fig. 1 to fig. 3, in step S22, the head temperature of the first extrusion die 2 is 185-. Preferably, the head temperature of the first extrusion die is 220 ℃, the pushing pressure of the first screw is 20MPa, and the extrusion speed is 8 m/min.
As shown in fig. 1, in step S23, the nylon and the high density polyethylene are integrated by extrusion through a second extrusion die, the nylon extrusion layer 107 is formed outside the high density polyethylene extrusion layer 106, and in step S23, the second extrusion die is evacuated.
As shown in fig. 1, since the nylon clad layer 107 is easily broken if extrusion tube extrusion is used in step S23, extrusion of the nylon clad layer 107 is preferably performed in this embodiment by extrusion.
As shown in fig. 1, in step S23, the thickness of the nylon extrusion layer 107 needs to be controlled to be 0.4-0.8mm, in this embodiment, the nylon extrusion layer 107 is preferably made of nylon 12, because the density of the nylon 12 is 1.15g/cm3, which is slightly greater than water, but the rockwell Hardness (HK)95-105 is higher, which makes the quality requirement higher when extruding the nylon extrusion layer 107 with a thinner thickness (0.4-0.8mm), so the nylon extrusion layer 107 (extruded nylon 12) is formed outside the high-density polyethylene extrusion layer 106, and a vacuum pumping manner needs to be adopted to ensure that the nylon 12 layer and the high-density polyethylene extrusion layer 106 are tightly attached, so as to prevent air bubbles from being present between the extruded nylon extrusion layer 107 and the high-density polyethylene extrusion layer 106, which may cause product bulging or sheath hole breaking.
As shown in fig. 1, in step S23, nylon 12 is used as the third protective layer in the metal plastic composite moisture barrier, and nylon 12 has high chemical stability, good oil resistance and wear resistance, low water absorption, and good dimensional stability. And because of its fine intensity and hardness and wearability smooth surface can reach the effective termite-proof effect, the formic acid that the termite gnaws and secretes when biting the nylon material reacts with chemical composition that nylon 12 produces and is disliked by the termite, can repel the termite effectively, protect the cable from termite's destruction.
In step S23, the head temperature of the second extrusion die is 160-215 ℃, the pushing pressure of the second screw in the second extrusion die is 18-25MPa, and the extrusion speed is 5-20 m/min. Preferably, the head temperature of the second extrusion die is 210 ℃, the pushing pressure of the second screw is 22MPa, and the extrusion speed is 8 m/min.
In this embodiment, the nylon extrusion layer 107 with uniform coating can be obtained only by requiring a large extrusion pressure during nylon extrusion, and the discharge is stable, so the second screw in the second extrusion die needs to be a dedicated nylon material extrusion screw. As shown in fig. 3, the second screw in the second extrusion die includes a second screw body, a screw barrel and a plurality of heating members, at least a portion of the second screw body is located in the screw barrel, and the plurality of heating members are located around the second screw body and are arranged along the axial direction of the screw barrel, as shown in fig. 4, wherein the second screw body includes a feeding section 11, a plasticizing section 12 and a homogenizing section 13, in this embodiment, the number of the heating members is 3, and the feeding section 11, the plasticizing section 12 and the homogenizing section 13 are all provided with a corresponding heating member.
As shown in fig. 4, the feeding section 11 is used for preheating nylon, the plasticizing section 12 is used for compressing and melting the plasticized nylon, the homogenizing section 13 is used for stirring and pushing the molten nylon to flow to the head of the second extrusion die, and the molten nylon flows to the head of the second extrusion die at constant pressure, temperature and flow rate under the action of the homogenizing section 13.
As shown in FIG. 4, the length of the feeding section 11 is 60-65% of the total length of the second screw body, the length of the plasticizing section 12 is 10-15% of the total length of the second screw body, and the length of the homogenizing section 13 is 20-25% of the total length of the second screw body. For example, the length of the feeding section 11 is 65% of the total length of the second screw body, the length of the plasticizing section 12 is 15% of the total length of the second screw body, and the length of the homogenizing section 13 is 20% of the total length of the second screw body.
As shown in FIG. 4, the compression ratio of the feeding section 11 to the homogenizing section 13 is 2.5-3.5, and the ratio of the total length of the second screw body to the outer diameter of the feeding section 11 is 24-26. Preferably, the compression ratio of the feeding section 11 to the homogenizing section 13 is 3, and the ratio of the total length of the second screw body to the outer diameter of the feeding section 11 is 25.
As shown in FIG. 4, the second screw rod with the above structure can generate larger and more stable pressure under the condition of equal feeding, and the output generates a spraying effect, thereby achieving the purpose of uniform coating.
In the step S22 and the step S23, extrusion is adopted, and the extrusion layer 106 of the high-density polyethylene and the extrusion layer 107 of the nylon are extruded in the extrusion mode, so that the cable can achieve the rounding effect, and the rounding degree needs to be kept above 90%.
As shown in fig. 3, after the step S22, after the high density polyethylene extrusion layer 106 is formed, a step of cooling the extruded high density polyethylene extrusion layer 106 in a sectional manner by using a cooling device is further included, wherein the cooling device includes a first water tank 4 and a second water tank 7 located downstream of the first water tank 4, wherein the temperature of water in the first water tank 4 is 50-60 ℃, in this embodiment, the temperature of water in the first water tank 4 is preferably 55 ℃, and the temperature of water in the second water tank 7 is preferably normal temperature water, and the temperature of the normal temperature water is between 20-25 ℃.
As shown in fig. 3, the advantage of using the sectional cooling is that the internal stress of the high density polyethylene extrusion layer 106 can be reduced, thereby improving the mechanical strength, elongation at break and cracking resistance of the finished product. Tests prove that the water temperature in the first water tank 4 is unsafe if the temperature is higher than 60 ℃, for example, potential safety hazards are caused to operators, and the internal stress is not reduced when the temperature is lower than 50 ℃.
As shown in fig. 3, the surface temperature of the high-density polyethylene extrusion layer 106 just extruded is high (usually 150 ℃ or higher), so that it needs to be cooled by water cooling, when water is added to the cooling water tank through a tap or a water pipe, a large amount of air is taken in the water, and bubbles are formed, and when the bubbles adhere to the surface of the high-density polyethylene extrusion layer 106 at a high temperature and are cooled by the first water tank 4 and/or the second water tank 7, the adhered bubbles cause a concave-convex structure on the surface of the high-density polyethylene extrusion layer 106.
As shown in fig. 3, in this embodiment, in order to avoid the generation of pits on the surface of the high-density polyethylene extrusion layer 106 during the cooling process, a step of adding a surfactant to the first water tank 4 and/or the second water tank 7 is further provided, the surfactant is used for preventing the generation of concave-convex structures (recesses or protrusions) on the surface of the high-density polyethylene extrusion layer 106 caused by bubbles in water, the mass percentage of the surfactant in each water tank is 1-1.2%, and the mass percentage of the surfactant in each water tank is preferably 1.05%.
The main components of the surfactant in this example include: linear alkyl benzene sulfonic acid: 11-12 parts; AES (Chinese meaning: sodium fatty alcohol polyoxyethylene ether sulfate): 7-9 parts; alkyl alcohol amide: 1-3 parts; preservative Kathon: 0.06-0.1 part; sodium hydroxide: 1-1.5 parts; AEO9 (Chinese meaning: fatty alcohol-polyoxyethylene ether): 6-8 parts; EDTA-2 Na (Chinese meaning: disodium ethylenediaminetetraacetate): 0.08-0.12 parts of thickening agent (NaCl): 0.8-1.2 parts; deionized water: 95-105 parts.
Preferred surfactant components are: 10.5 parts of alkanyl benzenesulfonic acid; 8 parts of AES; 65012 parts of alkylolamide; 0.08 part of preservative Kathon; 1.3 parts of sodium hydroxide; AEO 98 parts; 0.1 part of EDTA-2 Na and 1 part of thickening agent; 100 parts of deionized water.
After the surfactant is added, the surfactant acts to reduce the surface tension of the liquid, and because the surfactant is more easily adsorbed on the solid surface, a layer of membrane is formed between the bubbles and the surface of the high-density polyethylene extrusion coating layer 106, so that the bubbles are not attached to the surface of the high-density polyethylene extrusion coating layer 106.
In the trial production site, two kinds of trial products with and without the surfactant added were compared, and for the trial product with the surfactant added to the water, the surface of the high-density polyethylene extruded layer 106 was observed with a magnifying glass without a textured structure, and for the trial product without the surfactant added to the water, a large number of textured structures were clearly seen on the surface of the high-density polyethylene extruded layer 106.
The water in the first and/or second water tanks 4, 7 and the surfactant are replaced after 7-8 hours of use, in this embodiment once at 8 hours, since the surfactant is lost during use. The surfactant is filled by adopting an active agent filling device 6, the active agent filling device 6 comprises a feeding pump, a material box, a controller and a feeding electromagnetic valve, the feeding pump is connected with the material box through the feeding electromagnetic valve, the feeding pump and the feeding electromagnetic valve are respectively electrically connected with the controller, and the operation of the feeding pump is controlled by the controller.
The controller sets the charging time, and when the charging time is up, the controller controls the charging solenoid valve to be opened and controls the charging pump to work, and the charging pump sends the surfactant stored in the material box to the first water tank 4 and/or the second water tank 7. The advantage of automatic surfactant addition can be achieved by the control of the controller.
The first water tank 4 is provided with a water circulation mechanism 5 for reducing the loss of the surfactant. The water circulation mechanism 5 comprises at least two first support legs and a water circulation pump, the first support legs are used for supporting the first water tank 4, at least one part of the interior of each first support leg is hollow, the first support legs are communicated with the first water tank 4, the input end of the water circulation pump is connected with one first support leg, and the output end of the water circulation pump is connected with the other first support leg. When the circulating water pump is operated, the mixed liquid in the first water tank 4 is circulated.
The water circulation mechanism 5 with the structure utilizes the first supporting leg for supporting the first water tank 4, the first water tank 4 needs to be supported by the first supporting leg, and the first supporting leg is used as a pipeline for circulating mixed liquid, so that the cost is saved, and the area occupied by the water circulation mechanism 5 is reduced.
The outer protective sleeve in the step S3 includes an outer sheath 108, and the outer sheath 108 is wrapped on the outer circumferential surface of the nylon extrusion layer 107 by extrusion. The outer jacket 108 is preferably made of cross-linked flame retardant polyolefin. The cross-linked flame-retardant polyolefin includes vulcanized cross-linked flame-retardant polyolefin and irradiation cross-linked flame-retardant polyolefin, and the irradiation cross-linking is a common type, so in this embodiment, the irradiation cross-linked flame-retardant polyolefin is preferably selected.
In addition, in order to increase the mechanical performance of the cable and protect the cable core and the metal plastic composite moisture barrier from being damaged by external force, a steel wire armor layer (not shown in the figure) can be arranged between the outer sheath 108 and the nylon extrusion layer 107, the steel wire armor layer is combined with the nylon extrusion layer 107 in an armor mode, and then the outer sheath 108 is wrapped on the steel wire armor layer in an extrusion molding mode.
The utility model provides a cable has formed the compound moisture layer of metal plastic through above-mentioned technology between cable core and outer protective sheath, adopts single face aluminum-plastic composite tape aluminium face outward around the package or indulge the package cable core promptly, and single face aluminum-plastic composite tape is around the package or indulges the package back, adopts the extrusion formula mould direct extrusion molding one deck high density polyethylene extrusion layer, lets high density polyethylene extrude under high temperature directly with aluminum-plastic composite tape hot melt integrative. By adopting the hot melting mode, the requirement on the bonding strength of the metal plastic composite moisture barrier layer can be met. And then extruding a nylon extrusion coating outside the high-density polyethylene extrusion coating, wherein the nylon extrusion coating adopts nylon 12. The three-layer composite structure of this kind of aluminum-plastic composite belt and high density polyethylene and nylon sets up the mechanical physical properties and the intensity that have improved the cable, still can play excellent protection effect under the destroyed condition of outer protective sheath, compares with traditional aluminium sheath and lead sheath environmental protection more can effectively protect environment such as groundwater and soil. By means of the excellent termite-proof performance of the nylon material, compared with the common method of adding the termite-proof additive into the cable sheath material, the structure has no harm or irritation, and can effectively protect the body health of production, use and engineering construction staffs. Can be used in areas with high water level and termite distribution in tropical and subtropical zone.
The moisture-proof cable obtained by trial production by the above method was tested, and the results of determination of specific test items are shown in table 1 below.
TABLE 1
According to table 1 can know, through the utility model discloses a trial product that the scheme obtained all passes through corresponding test item, has proved the utility model discloses the excellence of scheme.
Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solution of the present invention, not to limit it, and not to limit the protection scope of the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (5)
1. A specialty bus cable, comprising:
the cable core has a shielding effect;
a metal plastic composite moisture barrier layer;
the outer protective sleeve is arranged around the metal plastic composite moisture barrier layer;
the cable core with shielding effect includes:
a conductor (101);
a first insulating layer (102) coated on the conductor (101);
a second insulating layer (103) enabling the characteristic impedance of the cable core to be controlled, wherein the second insulating layer (103) is wrapped on the first insulating layer (102);
a first shielding layer (104) for shielding electromagnetic signals, the first shielding layer (104) being wrapped on the second insulating layer (103);
the metal plastic composite moisture barrier is wrapped over the first shielding layer (104).
2. A specialty bus cable as claimed in claim 1, wherein the first insulating layer (102) is cross-linked polyethylene and the second insulating layer (103) is foamed polyolefin.
3. A special bus cable according to claim 1, wherein the first shielding layer (104) is made of tinned copper wire, and the tinned copper wire is wrapped on the second insulating layer (103) in a weaving manner.
4. A specialty bus cable according to claim 1, wherein said metal plastic composite moisture barrier comprises:
the aluminum-plastic composite tape wrapping layer (105) wrapped on the cable core is composed of a plastic film and an aluminum foil, and when the aluminum-plastic composite tape wrapping layer (105) is wrapped, the plastic film faces inwards and the aluminum foil faces outwards;
a high-density polyethylene extrusion layer (106) which is integrated with the aluminum foil in a hot melting way in an extrusion and extrusion way;
a nylon extrusion layer (107) which is integrated with the high-density polyethylene extrusion layer (106) in an extrusion way.
5. A specialty bus cable as claimed in claim 3 wherein said extruded nylon layer (107) is nylon 12.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221294345.9U CN217521773U (en) | 2022-05-26 | 2022-05-26 | Special bus cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221294345.9U CN217521773U (en) | 2022-05-26 | 2022-05-26 | Special bus cable |
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| CN217521773U true CN217521773U (en) | 2022-09-30 |
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| CN202221294345.9U Active CN217521773U (en) | 2022-05-26 | 2022-05-26 | Special bus cable |
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