Special aging-resistant cable for oil platform and preparation method of special aging-resistant cable

Abstract

The invention provides an anti-aging cable special for an oil platform and a preparation method thereof, and relates to the field of circuit cables, in particular to the anti-aging cable special for the oil platform and the preparation method thereof.The anti-aging cable special for the oil platform comprises a conductor, and the outer wall of the conductor is fixedly connected with an insulating layer; the outer wall of the insulating layer is fixedly connected with a shielding layer, and the outer wall of the shielding layer is fixedly connected with a sheath layer. The sheath layer comprises a special rubber material, an anti-aging agent, a flame retardant and an inorganic nano filler, the conductor is made of copper, and the insulating layer comprises a special polyolefin insulating material, an antioxidant, an ultraviolet light absorber, a flame retardant and other auxiliaries. The special rubber material is combined with the anti-aging agent, the flame retardant and the inorganic nano filler, so that the cable has excellent aging resistance and corrosion resistance to adapt to the severe environment of an oil platform, aging is effectively delayed, the flame retardant property is enhanced, the strength and wear resistance of the sheath are improved, and the internal structure of the cable is better protected.

Description

Technical Field

[0001] The invention relates to the technical field of circuit cables, in particular to an aging-resistant cable special for oil platforms and a preparation method thereof. Background Art

[0002] With the continuous development of the oil industry, the construction and operation of oil platforms occupy a vital position in the global energy supply. As key facilities for offshore oil and gas exploitation, the normal operation of oil platforms plays an irreplaceable role in ensuring a stable supply of energy.

[0003] In the complex working environment of oil platforms, cables undoubtedly play a vital role. Cables are responsible for transmitting electricity and signals to ensure that various equipment on oil platforms can operate normally. First of all, oil platforms are in a high-temperature environment for a long time. Various equipment on the platform will generate a lot of heat during operation, which will increase the temperature of the surrounding environment. Under such high temperature conditions, existing cable materials are prone to thermal aging, resulting in a decrease in insulation performance and may even cause safety accidents such as short circuits. Secondly, high humidity and high salt fog are also significant characteristics of the oil platform environment. Long-term exposure to high humidity and high salt fog will gradually reduce the insulation performance of the cable and increase the conductivity, thereby affecting the transmission quality of electricity and signals. Furthermore, there may be a risk of mechanical damage on the oil platform. During the construction and daily maintenance of the platform, the cable may be subjected to mechanical forces such as collision, extrusion, and pulling. Existing cable materials often have deficiencies in mechanical strength and are prone to damage and breakage, affecting the normal operation of the oil platform.

[0004] At present, existing cables usually use polyethylene, polyvinyl chloride and other materials as insulation layers and outer sheaths. These materials have good performance under general conditions, but they show obvious defects in the harsh environment of oil platforms. For example, polyethylene materials are easy to soften and deform at high temperatures, and their anti-aging performance is poor; although polyvinyl chloride materials have certain flame retardant properties, they are easy to corrode in high salt spray environments. In summary, the development of an aging-resistant cable specifically suitable for oil platforms has become an urgent need in the current oil industry. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an aging-resistant cable specially used for oil platforms and a preparation method thereof, which solves the problems that the existing cables are prone to aging, corrosion, and insufficient flame retardancy in such harsh environments.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an aging-resistant cable specially used for oil platforms, comprising a conductor, the outer wall of the conductor is fixedly connected with an insulating layer, the outer wall of the insulating layer is fixedly connected with a shielding layer, and the outer wall of the shielding layer is fixedly connected with a sheath layer; the sheath layer comprises: 80%-88% of special rubber material, 1%-4% of anti-aging agent, 1%-4% of flame retardant, and 1%-4% of inorganic nanofiller.

[0007] Preferably, the conductor is made of copper.

[0008] Preferably, the insulating layer includes 80%-85% of special polyolefin insulating material, 1%-3% of antioxidant, 1%-2% of ultraviolet absorber, 2%-5% of flame retardant, and 2%-5% of other additives.

[0009] Preferably, the antioxidant is a hindered phenol antioxidant, the UV absorber is benzophenone, the flame retardant is aluminum hydroxide, and the other additives include: a lubricant and an antistatic agent.

[0010] Preferably, the shielding layer is woven from tinned copper wires.

[0011] A method for preparing an aging-resistant cable specially used for an oil platform comprises the following steps: S1. Conductor manufacturing: High-purity copper is used to make conductors through wire drawing, annealing and stranding processes; S2. Insulation layer extrusion: Mix the insulating materials and stir them, extrude them onto the conductor through an extruder and cool and solidify; S3. Shielding layer processing: Use tinned copper wire to weave outside the insulation layer to form a shielding layer; S4. Sheath layer extrusion: Mix the sheath materials and knead them, extrude them outside the shielding layer through an extruder and cool and solidify.

[0012] Preferably, in step S1, the process is specifically as follows: High-purity copper materials are selected and drawn into the required conductor diameter through wire drawing process. The wire drawing speed is controlled at 5 meters / minute; The drawn conductor is annealed at a temperature of 400°C-500°C for 2-3 hours to eliminate the stress inside the conductor and improve the flexibility and conductivity of the conductor; A stranding process is used to strand multiple monofilament conductors into bundles to form the conductor part of the cable. The stranding pitch is 100-120 mm and the stranding speed is 30-40 rpm.

[0013] Preferably, in step S2, the specific process is: Special polyolefin insulation material, hindered phenol antioxidant, benzophenone ultraviolet absorber, aluminum hydroxide flame retardant and other additives are mixed in proportion and stirred evenly in a high-speed mixer. The stirring speed of the high-speed mixer is 100-200 rpm, and the stirring time is 5-6 hours; Add the mixed insulating material into the extruder, set the temperature of the first zone of the extruder to 180℃-200℃, the temperature of the second zone to 190℃-210℃, the temperature of the third zone to 200℃-220℃, and the temperature of the die head to 210℃-230℃. The extrusion speed is 3-5 meters / minute; The conductor is passed through the extruder head so that the insulating material is evenly extruded on the outer wall of the conductor to form an insulating layer; The extruded insulation layer is cooled and solidified by water cooling for 1 hour.

[0014] Preferably, in step S3, the specific process is: Select tinned copper wire of appropriate specifications and weave it on the outer wall of the insulation layer using a weaving machine to form a shielding layer.

[0015] Preferably, in step S4, the specific process is: The special rubber material, anti-aging agent, flame retardant and inorganic nano filler are mixed in proportion and fully kneaded in an internal mixer. The temperature of the internal mixer is 150℃-200℃, and the mixing time is 3-5 hours; Add the mixed sheath material into the extruder, set the temperature of the first zone of the extruder to 170℃-190℃, the temperature of the second zone to 180℃-200℃, the temperature of the third zone to 190℃-210℃, and the temperature of the die head to 200℃-220℃. The extrusion speed is 2.5-6m / min; The cable with the shielding layer is passed through the extruder head, so that the sheath material is evenly extruded on the outer wall of the shielding layer to form a sheath layer; The extruded sheath layer is cooled and solidified by air cooling for 1.5-3 hours.

[0016] The present invention provides an aging-resistant cable specially used for oil platforms and a preparation method thereof. It has the following beneficial effects: 1. The present invention adopts special rubber materials combined with anti-aging agents, flame retardants and inorganic nano-fillers to make the cable have excellent aging resistance and corrosion resistance to adapt to the harsh environment of oil platforms, effectively delay aging, enhance flame retardancy, improve sheath strength and wear resistance, and better protect the internal structure of the cable.

[0017] 2. The present invention designs multiple embodiments according to different needs. For example, the PEEK material in Embodiment 2 combined with antioxidants and the like has excellent corrosion resistance, and the glass fiber reinforced material further improves the strength and rigidity of the sheath; the TPU material in Embodiment 3 has good flexibility, wear resistance and corrosion resistance, and the carbon nanotube reinforcer improves the strength and conductivity of the sheath; the fluoroplastic material in Embodiment 4 is excellent in aging resistance, corrosion resistance and high temperature resistance, and the ceramic microbead filler improves the hardness and heat resistance of the sheath.

[0018] 3. The present invention clarifies the advantages of various embodiments in terms of aging resistance, corrosion resistance, flame retardancy and mechanical strength through four comparative experiments, providing a scientific basis for oil platforms to select suitable cables under different environments and usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereogram of the present invention.

[0020] Figure 2 It is a flow chart of the preparation method of the present invention.

[0021] Among them, 1. Conductor; 2. Insulation layer; 3. Shielding layer; 4. Sheath layer. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1: Please see attached Figure 1 -Attached Figure 2 An embodiment of the present invention provides an aging-resistant cable for oil platforms, including a conductor 1, an insulating layer 2 is fixedly connected to the outer wall of the conductor 1, a shielding layer 3 is fixedly connected to the outer wall of the insulating layer 2, and a sheath layer 4 is fixedly connected to the outer wall of the shielding layer 3.

[0024] Conductor 1 is made of 100% copper.

[0025] Insulation layer 2, including 85% of special polyolefin insulation material, 3% of antioxidant, 2% of ultraviolet absorber, 5% of flame retardant, and 5% of other additives; Among them, the antioxidant is specifically a hindered phenol antioxidant, the UV absorber is specifically a benzophenone, the flame retardant is specifically aluminum hydroxide, and other additives include: lubricants, antistatic agents; The shielding layer 3 is woven from 100% tinned copper wire; The sheath layer 4 includes: special rubber material 88%, anti-aging agent 4%, flame retardant 4%, and inorganic nano filler 4%; A method for preparing an aging-resistant cable specially used for an oil platform comprises the following steps: S1. Conductor manufacturing: High-purity copper materials are selected and drawn into the required conductor 1 diameter through wire drawing process. The wire drawing speed is controlled at 5 m / min; The drawn conductor 1 is annealed at a temperature of 400° C. for 2 hours to eliminate stress inside the conductor 1 and improve the flexibility and conductivity of the conductor 1. A plurality of monofilament conductors 1 are twisted into a bundle by a twisting process to form a conductor 1 part of the cable. The twisting pitch is 100 mm and the twisting speed is 30 turns / min; S2. Insulation layer extrusion: Special polyolefin insulation material, hindered phenol antioxidant, benzophenone ultraviolet absorber, aluminum hydroxide flame retardant and other auxiliary lubricants, antistatic agent, etc. are mixed according to the proportion and fully stirred in a high-speed mixer. The stirring speed of the high-speed mixer is 100 rpm and the stirring time is 5 hours; Add the mixed insulating material into the extruder, set the temperature of the first zone of the extruder to 180℃, the temperature of the second zone to 190℃, the temperature of the third zone to 200℃, and the temperature of the die head to 210℃. The extrusion speed is 3 m / min; The conductor 1 is passed through the extruder head, so that the insulating material is evenly extruded on the outer wall of the conductor 1 to form an insulating layer 2; The extruded insulating layer 2 is cooled and solidified by water cooling for 1 hour; S3. Shielding layer processing: Tinned copper wire of appropriate specifications is selected and braided on the outer wall of the insulating layer 2 by a braiding machine to form a shielding layer 3. The braiding density is 85%, the braiding angle is 45 degrees, and the braiding speed is 2 meters / minute. S4. Sheath layer extrusion: The special rubber material, anti-aging agent, flame retardant and inorganic nano filler are mixed in proportion and fully kneaded in an internal mixer. The temperature of the internal mixer is 150°C and the mixing time is 3 hours; Add the mixed sheath material into the extruder, set the temperature of the first zone of the extruder to 170°C, the temperature of the second zone to 180°C, the temperature of the third zone to 190°C, and the head temperature to 200°C. The extrusion speed is 2.5 m / min; Pass the cable with the shielding layer 3 through the extruder head, so that the sheath material is evenly extruded on the outer wall of the shielding layer 3 to form a sheath layer 4; The extruded sheath layer 4 is cooled and solidified by air cooling for 1.5 hours.

[0026] Embodiment 1 Beneficial effects: The special rubber material has excellent aging resistance and corrosion resistance, and can adapt to the harsh environment of the oil platform. The anti-aging agent can effectively delay the aging process of the rubber material and increase the service life of the sheath. The flame retardant can enhance the flame retardant properties of the cable and reduce the risk of fire. The inorganic nanofiller can improve the strength and wear resistance of the sheath, and can better protect the internal structure when the cable may be subjected to friction or collision.

[0027] Embodiment 2: On the basis of the first embodiment, the sheath layer 4 is improved, and the sheath layer 4 comprises: 85% of polyetheretherketone PEEK material, 5% of antioxidant, 5% of flame retardant, and 5% of glass fiber reinforced material; Embodiment 2 Beneficial effects: PEEK material has extremely high aging resistance, corrosion resistance and mechanical strength, and is very suitable for the special environment of oil platforms. Antioxidants can prevent PEEK from being oxidized during long-term use. Flame retardants ensure that the cable has a certain flame retardant ability in the event of a fire. Glass fiber reinforced materials can further improve the strength and rigidity of the sheath and enhance the protection of the internal structure of the cable, especially in situations where it needs to withstand greater mechanical stress.

[0028] Embodiment 3: Based on Embodiment 1, the sheath layer 4 is improved, and the sheath layer 4 comprises: thermoplastic polyurethane elastomer TPU 86%, anti-aging agent 3.5%, flame retardant 4%, and carbon nanotube reinforcing agent 6.5%; Example 3 Beneficial effects: TPU has good flexibility, wear resistance and corrosion resistance. Anti-aging agent can effectively resist the aging effect of environmental factors on the sheath. Flame retardant improves the flame retardant performance of the cable. Carbon nanotube reinforcing agent can significantly improve the strength and conductivity of the sheath. In some oil platform areas that are sensitive to electromagnetic interference, this conductivity can play a certain role in static discharge and reduce safety hazards. At the same time, good flexibility makes the cable easier to bend and lay during installation and use.

[0029] Embodiment 4: Based on Embodiment 1, the sheath layer 4 is improved, and the sheath layer 4 comprises: 84% fluoroplastic material, 4% anti-aging compound, 4% flame retardant synergist, and 8% ceramic microbead filler; Embodiment 4 Beneficial effects: Fluoroplastic has excellent aging resistance, corrosion resistance and high temperature resistance, and is particularly suitable for use in extreme environments. The anti-aging compound is composed of a variety of anti-aging components and can protect the sheath in all directions. The flame retardant synergist works synergistically with the fluoroplastic to enhance the flame retardant effect. The ceramic microbead filler can improve the hardness and heat resistance of the sheath and reduce the risk of deformation in a high temperature environment. In the specific area of ​​the oil platform with high temperature and strong corrosion, the sheath of this embodiment shows stronger stability and reliability.

[0030] Comparative experiment 1: aging resistance test Experimental steps: The cable samples made in four embodiments were prepared, and at least three identical samples were prepared for each embodiment.

[0031] The samples were placed in an aging test chamber simulating the oil platform environment. The chamber temperature was set at 60°C, the humidity was set at 90%, and the UV radiation intensity was set at 50 W / m2.

[0032] Take out samples every 10 hours for appearance inspection and performance testing.

[0033] The appearance inspection mainly observes whether there are any changes such as discoloration and cracks on the cable surface. Performance tests include electrical performance tests such as conductor resistance and insulation resistance, as well as mechanical performance tests such as tensile strength. Experimental conclusion: Example 1: After a period of time, the cable surface is almost unchanged, the conductor resistance, insulation resistance and other properties are stable, and the performance decrease is within 5%. The special rubber material combined with the anti-aging agent has outstanding performance in aging resistance; Example 2: The cable surface has slight discoloration and the performance is reduced by about 10%; Example 3: The cable surface discoloration is more obvious, and the performance decreases by about 15%; Example 4: There is obvious discoloration and the performance decreases by about 20%. Example Description of appearance changes Performance degradation Embodiment 1 Almost no change Performance degradation within 5% Embodiment 2 Slight discoloration Performance drops by about 10% Embodiment 3 There is some discoloration, but it is not obvious Performance drops by about 15% Embodiment 4 There is a more obvious discoloration Performance drops by about 20%

[0034] Comparative experiment 2: Corrosion resistance test Experimental steps: The cable samples made in four embodiments were prepared, and at least three identical samples were prepared for each embodiment.

[0035] The samples were immersed in seawater with a salinity of 3.5%.

[0036] Take out samples every 10 hours for appearance inspection and performance testing.

[0037] The appearance inspection mainly observes whether there are signs of corrosion on the cable surface. Performance tests include electrical performance tests such as conductor resistance and insulation resistance, as well as mechanical performance tests such as tensile strength.

[0038] Experimental conclusion: Example 2: During the test, the cable appearance was almost unchanged, and the conductor resistance, insulation resistance and other properties were stable. PEEK material combined with antioxidants and the like has excellent corrosion resistance.

[0039] Example 1: There are slight signs of corrosion on the cable surface, and the performance is affected to a certain extent.

[0040] Embodiment 3: The corrosion on the cable surface is more obvious, and the degree of performance degradation is greater than that in Embodiment 1.

[0041] Embodiment 4: There is a certain degree of corrosion on the cable surface, and the degree of performance degradation is between Embodiment 1 and Embodiment 3. Example Description of appearance changes Performance degradation Embodiment 2 Almost no change Performance degradation within 3% Embodiment 1 Slight signs of corrosion Performance decreased by about 8% Embodiment 3 There are a few corrosion spots Performance decreased by about 12% Embodiment 4 There is a certain degree of corrosion Performance drops by about 15%

[0042] Comparative experiment three: flame retardant performance test Experimental steps: The cable samples made in four embodiments were prepared, and at least three identical samples were prepared for each embodiment.

[0043] Using a standard combustion test device, place the sample horizontally and ignite one end of the sample with a flame source of a certain intensity.

[0044] The burning time and self-extinguishing time are recorded, and the flame retardant grade is determined according to the standard.

[0045] Experimental conclusion: Example 3: Short burning time, extremely fast self-extinguishing time, and high flame retardant grade. Thermoplastic polyurethane elastomer TPU has excellent flame retardant properties under the synergistic effect of anti-aging agent, flame retardant and carbon nanotube reinforcing agent.

[0046] Embodiment 1: The burning time and the self-extinguishing time are relatively long, and the flame retardant grade is lower than that of Embodiment 3.

[0047] Embodiment 2: The burning time and the self-extinguishing time are moderate, and the flame retardancy level is between that of Embodiment 1 and Embodiment 3.

[0048] Embodiment 4: The burning time and the self-extinguishing time are longer, and the flame retardant grade is lower than that of Embodiment 2. Example Burning time seconds Self-extinguishing time in seconds Embodiment 3 5 10 Embodiment 2 7 15 Embodiment 4 8 18 Embodiment 1 10 20

[0049] Comparative experiment 4: Mechanical strength test Experimental steps: The cable samples made in four embodiments were prepared, and at least three identical samples were prepared for each embodiment.

[0050] The tensile strength test was carried out using a tensile testing machine, the tensile speed was set to 10 mm / min, and the maximum tensile force when the sample broke was recorded.

[0051] The bending strength test was carried out using a bending tester, the bending radius was set to 150 mm, and the maximum stress of the sample during the bending process was recorded.

[0052] Use an impact tester to test the impact strength, set the impact height to 500 mm, and record the energy absorption of the sample after impact Experimental conclusion: Example 4: High tensile strength, high bending strength and strong impact strength. Fluoroplastic materials have excellent mechanical strength under the combined effect of anti-aging compound, flame retardant synergist and ceramic micro-bead filler.

[0053] Embodiment 1: The tensile strength, bending strength and impact strength are relatively low.

[0054] Embodiment 2: The tensile strength, bending strength and impact strength are between those of Embodiment 1 and Embodiment 4.

[0055] Example 3: The tensile strength, bending strength and impact strength are lower than those of Example 2. Example Tensile strength MPa Bending strength MPa Embodiment 4 28 38 Embodiment 2 25 35 Embodiment 3 22 32 Embodiment 1 20 30

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aging-resistant cable specially used for oil platforms, comprising a conductor (1), characterized in that: The outer wall of the conductor (1) is fixedly connected to an insulating layer (2), the outer wall of the insulating layer (2) is fixedly connected to a shielding layer (3), and the outer wall of the shielding layer (3) is fixedly connected to a sheath layer (4); the sheath layer (4) comprises: 80%-88% of a special rubber material, 1%-4% of an anti-aging agent, 1%-4% of a flame retardant, and 1%-4% of an inorganic nano filler.

2. The aging-resistant cable for oil platforms according to claim 1 is characterized in that: The conductor (1) is made of copper.

3. The aging-resistant cable for oil platforms according to claim 1 is characterized in that: The insulating layer (2) comprises 80%-85% of a special polyolefin insulating material, 1%-3% of an antioxidant, 1%-2% of an ultraviolet absorber, 2%-5% of a flame retardant, and 2%-5% of other additives.

4. The aging-resistant cable for oil platforms according to claim 3 is characterized in that: The antioxidant is specifically a hindered phenol antioxidant, the ultraviolet absorber is specifically a benzophenone, the flame retardant is specifically aluminum hydroxide, and the other additives include: a lubricant and an antistatic agent.

5. The aging-resistant cable for oil platforms according to claim 1 is characterized in that: The shielding layer (3) is woven from tinned copper wires.

6. A method for preparing an aging-resistant cable for oil platforms according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Conductor manufacturing: High-purity copper is selected and the conductor is made through wire drawing, annealing and stranding processes (1); S2. Insulation layer extrusion: mixing the insulating material and stirring it, extruding it onto the conductor (1) through an extruder and cooling and solidifying it; S3. Shielding layer processing: tinned copper wire is woven outside the insulating layer (2) to form a shielding layer (3); S4. Extrusion of the sheath layer (4): The sheath materials are mixed and kneaded, extruded outside the shielding layer (3) through an extruder and cooled to solidify.

7. The method for preparing a special aging-resistant cable for oil platforms according to claim 6, characterized in that: In step S1, the process is specifically as follows: Select high-purity copper material and draw the copper material into a desired conductor (1) diameter through a wire drawing process; The wire drawing speed is controlled at 5 m / min; Annealing the drawn conductor (1) at a temperature of 400°C to 500°C for 2 to 3 hours to eliminate stress inside the conductor (1) and improve the flexibility and conductivity of the conductor (1); A plurality of monofilament conductors (1) are twisted into a bundle by a twisting process to form a conductor (1) portion of a cable, wherein the twisting pitch is 100-120 mm and the twisting speed is 30-40 turns / minute.

8. The method for preparing an aging-resistant cable for oil platforms according to claim 6, characterized in that: In step S2, the specific process is: Special polyolefin insulating material, hindered phenol antioxidant, benzophenone ultraviolet absorber, aluminum hydroxide flame retardant and other additives are mixed according to proportion and fully stirred in a high-speed mixer; The stirring speed of the high-speed mixer is 100-200 rpm, and the stirring time is 5-6 hours; Add the mixed insulating material into the extruder, set the temperature of the first zone of the extruder to 180℃-200℃, the temperature of the second zone to 190℃-210℃, the temperature of the third zone to 200℃-220℃, and the temperature of the die head to 210℃-230℃; The extrusion speed is 3-5 m / min; Passing the conductor (1) through an extruder head, so that the insulating material is evenly extruded on the outer wall of the conductor (1) to form an insulating layer (2); The extruded insulating layer (2) is cooled and solidified, and the cooling method is water cooling, and the cooling time is 1 hour.

9. The method for preparing a special aging-resistant cable for oil platforms according to claim 6, characterized in that: In step S3, the specific process is: Tinned copper wires of suitable specifications are selected and braided onto the outer wall of the insulating layer (2) using a braiding machine to form a shielding layer (3).

10. The method for preparing an aging-resistant cable for oil platforms according to claim 6, characterized in that: In step S4, the specific process is: The special rubber material, anti-aging agent, flame retardant and inorganic nano filler are mixed according to proportion and fully mixed in an internal mixer; The temperature of the internal mixer is 150℃-200℃, and the mixing time is 3-5 hours; Add the mixed sheath material into the extruder, set the temperature of the first zone of the extruder to 170℃-190℃, the temperature of the second zone to 180℃-200℃, the temperature of the third zone to 190℃-210℃, and the temperature of the die head to 200℃-220℃; Extrusion speed is 2.5-6 m / min; Passing the cable with the shielding layer (3) through an extruder head, so that the sheath material is evenly extruded on the outer wall of the shielding layer (3) to form a sheath layer (4); The extruded jacket layer (4) is cooled and solidified, and the cooling method is air cooling, and the cooling time is 1.5-3 hours.

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