Non-metallic central tube stranded anti-icing optical cable and manufacturing process thereof

Abstract

The application discloses a non-metal center pipe stranded anti-freezing optical cable and a manufacturing process thereof, and belongs to the technical field of optical cables. The non-metal center pipe stranded anti-freezing optical cable comprises an optical cable main body, wherein the optical cable main body comprises an optical fiber, a fiber paste, an optical unit TPEE coating layer, a TPEE optical unit, a secondary coating PBT alloy material, a water-blocking belt, an outer sheath and a parallel embedded FRP, the outer sheath is located on the outer surface of the water-blocking belt, the parallel embedded FRP is located on the outer sheath, the water-blocking belt is located on the outer surface of the secondary coating PBT alloy material, and the secondary coating PBT alloy material is located on the outer surface of the TPEE optical unit. The non-metal center pipe stranded anti-freezing optical cable and the manufacturing process thereof have the advantages that a non-center reinforcing member stranded mode is adopted when the optical unit is designed to be stranded, a high-hardness PBT alloy material is coated on the cable core after the cable core is filled with the fiber paste, a new type of plastic material TPEE material is adopted for the stranded unit, different colors are adopted to distinguish the optical units, and the use performance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication optical cable for power, in particular to a non-metallic center tube stranded anti-freezing optical cable and its manufacturing process. BACKGROUND

[0002] The non-metallic center tube stranded anti-freezing optical cable is a communication optical cable for power. The conventional power lead-in optical cable adopts a conventional layer-stranded structure, that is, the sleeve and the possible filling rope are directly stranded around the central strength member, and a layer of extruded sheath material is directly extruded outside the layer-stranded cable core. In the application scenario where power and communication coexist in a substation, a metal composite tape cannot be used as a reinforcing unit. The optical cable enters the intelligent substation from the underground through a guide steel pipe. If water enters the steel pipe, icing will occur in the steel pipe under severe cold conditions, causing the optical cable to be squeezed by the ice. Therefore, the conventional non-metallic lead-in optical cable only has one layer of flame-retardant sheath, and its lateral pressure resistance is poor. With the continuous development of science and technology, people's requirements for the manufacturing process of non-metallic flame-retardant optical cables are also getting higher and higher.

[0003] The existing non-metallic flame-retardant optical cable has certain drawbacks when in use. At present, the optical cable for power communication is mostly suspended on the tower by ADSS optical cable between towers, and flame-retardant lead-in optical cable is required for guiding from the tower to the machine room. The optical cable enters the intelligent substation from the underground through a guide steel pipe. In the northern cold region, if rainwater or underground water enters the steel pipe, icing in the steel pipe will easily occur, causing the optical cable to be squeezed by the ice. When the optical cable is squeezed by the ice, the attenuation will be large, and even the communication will be interrupted. In the winter frozen soil environment, it is time-consuming and laborious to dig out the optical cable for maintenance, and the cost is very high. Only temporary ground optical cable can be laid to solve the communication problem in an emergency, and the communication will be interrupted again after the weather warms up. Therefore, we propose a non-metallic center tube stranded anti-freezing optical cable and its manufacturing process. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the deficiencies of the prior art, the present application provides a non-metallic center tube stranded anti-freezing optical cable and its manufacturing process. In the design of the optical unit stranding, a centerless stranding method is adopted. After stranding, the cable core is filled with fiber paste, and then a layer of high-hardness PBT alloy material is coated. The stranding unit adopts a new type of plasticized material TPEE material. The optical units are distinguished by different colors, which improves the use performance and effectively solves the problems in the background art.

[0006] (II) Technical solutions

[0007] In order to achieve the above object, the technical scheme adopted by the present application is as follows: a non-metal center pipe stranded anti-freezing optical cable, comprising an optical cable main body, the optical cable main body comprising an optical fiber, a fiber paste, an optical unit TPEE coating layer, a TPEE optical unit, a secondary coating PBT alloy material, a water blocking belt, an outer sheath and a parallel embedded FRP, the outer sheath being located on the outer surface of the water blocking belt, the parallel embedded FRP being located on the outer sheath, the water blocking belt being located on the outer surface of the secondary coating PBT alloy material, the secondary coating PBT alloy material being located on the outer surface of the TPEE optical unit, the TPEE optical unit being located on the outer surface of the optical unit TPEE coating layer, the optical unit TPEE coating layer being located on the outer side of the optical fiber and the fiber paste, a multifunctional composite sleeve being located between the TPEE optical unit and the secondary coating PBT alloy material, and a sealing reinforcing framework ring being located between the secondary coating PBT alloy material and the water blocking belt.

[0008] As a preferred technical scheme of the present application, the multifunctional composite sleeve comprises an eva material, a tpu material, a heat-insulating fire-resistant material, a waterproof material and a strong and tough ceramic material, the strong and tough ceramic material being located on the surface of the waterproof material, the waterproof material being located on the surface of the heat-insulating fire-resistant material, the heat-insulating fire-resistant material being located on the surface of the tpu material, and the tpu material being located on the surface of the eva material.

[0009] As a preferred technical scheme of the present application, the sealing reinforcing framework ring comprises an outer framework, an epoxy resin sleeve, a silicone rubber sheath, a middle framework, a filling sleeve and an inner framework, the outer framework being located on the surface of the epoxy resin sleeve, the epoxy resin sleeve being located on the surface of the silicone rubber sheath, the silicone rubber sheath being located on the surface of the filling sleeve, the filling sleeve being located on the surface of the inner framework, and the middle framework being located between the filling sleeve and the silicone rubber sheath.

[0010] As a preferred technical scheme of the present application, the optical fiber, the fiber paste and the optical unit TPEE coating layer are sealingly and fixedly connected, the optical unit TPEE coating layer and the TPEE optical unit are sealingly positioned, the secondary coating PBT alloy material, the water blocking belt and the outer sheath are sealingly positioned, the secondary coating PBT alloy material, the water blocking belt and the sealing reinforcing framework ring are sealingly positioned, and the TPEE optical unit, the secondary coating PBT alloy material and the multifunctional composite sleeve are sealingly positioned.

[0011] As a preferred technical scheme of the present application, the eva material, the tpu material, the heat-insulating fire-resistant material, the waterproof material and the strong and tough ceramic material are integrally formed by injection molding.

[0012] As a preferred technical scheme of the present application, the outer framework, the epoxy resin sleeve, the silicone rubber sheath, the filling sleeve and the inner framework are integrally formed by injection molding, and the filling sleeve, the silicone rubber sheath and the middle framework are sealingly fixed.

[0013] A manufacturing process of a non-metal central tube stranded anti-freezing optical cable, comprising the following operation steps:

[0014] S1: The optical cable structure features include TPEE sheathed optical unit, PBT alloy material secondary coating layer, water blocking tape, embedded FRP reinforcement, and high flame-retardant outer sheath.

[0015] S2: The TPEE sheathed optical unit is formed by optimizing the existing extrusion mold and optimizing the tension setting, and the optical unit adopts a 1-tube 2-48-core structure, and the optical fiber can adopt 180um, 200um and 245um optical fiber to design TPEE sheathed optical units with different structure sizes.

[0016] S3: The TPEE optical units of different colors are stranded or unidirectionally stranded to form cable core units, and then the secondary coating layer is extruded after filling the fiber paste through the oil filling mold, and the extruded material adopts a new PBT alloy material.

[0017] S4: The loose tube containing the stranded optical unit is longitudinally wrapped with a water blocking tape, and then an outer sheath is applied, the outer sheath adopts a high flame-retardant sheath material, and the outer sheath is embedded with four parallel FRPs, which can improve the lateral pressure resistance, tensile resistance and rat-proof performance of the optical cable.

[0018] As a preferred technical solution of the present application, the manufacturing process flow of the optical cable in the S1-S4 steps is optical fiber warehousing, optical fiber coloring, TPEE sheathing, sheathed optical unit stranding, PBT secondary coating, and embedded FRP outer sheath.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the application provides a non-metal center pipe stranded anti-freezing optical cable and a manufacturing process thereof, which has the following beneficial effects: the non-metal center pipe stranded anti-freezing optical cable and the manufacturing process thereof adopt a center-strengthening-free stranded mode when designing optical unit stranding, the cable core is filled with fiber paste after stranding, and then a high-hardness PBT alloy material is coated thereon, the stranding unit adopts a new type of plastic covering material TPEE material, and different colors are used to distinguish between optical units, and if more than 12 optical units are used, color strips or color rings are used to distinguish between the optical units, so that the problem of easy identification of the optical units with a large core number is solved, the plastic covering material for the secondary coating is a PBT alloy material mixed with a plasticizer and other auxiliary materials in a certain proportion, the bending, lateral pressure resistance and flattening resistance of the optical cable are improved, a high-foaming TPU modified material is developed for the material to realize extrusion technology development, there is sufficient buffer deformation space when the optical cable is subjected to freezing deformation, the loose sleeve pipe containing the stranded optical unit is longitudinally wrapped with a water-blocking belt and then is provided with an outer sheath, the outer sheath is made of a high-flame-retardant sheath material, and four parallel FRP are embedded in the outer sheath, which improves the lateral pressure resistance of the optical cable and the tensile and rat resistance of the optical cable, meets the requirements of anti-freezing and flame-retardant optical cables required by power construction in severe cold regions, realizes steel pipe freezing, and the entire non-metal center pipe stranded anti-freezing optical cable has simple structure, convenient operation and better use effect than the traditional mode. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole structure schematic diagram of the application of a non-metal center pipe stranded anti-freezing optical cable and a manufacturing process thereof.

[0022] Figure 2 It is a structure schematic diagram of a multifunctional composite sleeve in the application of a non-metal center pipe stranded anti-freezing optical cable and a manufacturing process thereof.

[0023] Figure 3 It is a structure schematic diagram of a sealing strengthening skeleton ring in the application of a non-metal center pipe stranded anti-freezing optical cable and a manufacturing process thereof.

[0024] Figure 4 It is a process flow schematic diagram in the application of a non-metal center pipe stranded anti-freezing optical cable and a manufacturing process thereof.

[0025] In the figure: 1, optical cable main body; 2, optical fiber; 3, fiber paste; 4, optical unit TPEE coating layer; 5, TPEE optical unit; 6, secondary coated PBT alloy material; 7, water-blocking belt; 8, outer sheath; 9, parallel embedded FRP; 10, sealing strengthening skeleton ring; 11, multifunctional composite sleeve; 12, eva material; 13, tpu material; 14, heat-insulating refractory material; 15, strong and tough ceramic material; 16, waterproof material; 17, outer skeleton; 18, epoxy resin sleeve; 19, silicone rubber sheath; 20, middle skeleton; 21, filling sleeve; 22, inner skeleton. DETAILED DESCRIPTION

[0026] The technical solutions of the present application will be described clearly and completely in combination with the drawings and specific embodiments, but those skilled in the art will understand that the following described embodiments are part of the embodiments of the present application, not all the embodiments, and are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application. The specific conditions are not specified in the embodiments, and are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not specified by the manufacturer, and are conventional products that can be obtained by market purchase.

[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] As Figures 1-4As shown, a non-metallic central tube stranded anti-icing optical cable includes an optical cable body 1. The optical cable body 1 includes optical fiber 2, fiber grease 3, a TPEE (Total Partial Coating) optical unit coating layer 4, a TPEE optical unit 5, a secondary coating PBT alloy material 6, a water-blocking tape 7, an outer sheath 8, and parallel embedded FRP 9. The outer sheath 8 is located on the outer surface of the water-blocking tape 7, the parallel embedded FRP 9 is located on the outer sheath 8, the water-blocking tape 7 is located on the outer surface of the secondary coating PBT alloy material 6, the secondary coating PBT alloy material 6 is located on the outer surface of the TPEE optical unit 5, the TPEE optical unit 5 is located on the outer surface of the TPEE optical unit coating layer 4, and the TPEE optical unit coating layer 4 is located outside the optical fiber 2 and fiber grease 3. A multifunctional composite sleeve 11 is positioned between the E-optical unit 5 and the secondary coated PBT alloy material 6. A sealing and reinforcing skeleton ring 10 is positioned between the secondary coated PBT alloy material 6 and the water-blocking tape 7. The optical units are stranded using a centerless reinforcing member stranding method. After the stranded cable core is filled with fiber grease, it is coated with a high-hardness PBT alloy material. The optical cable has better bending performance and lateral pressure resistance. When the secondary coated layer is squeezed and deformed, it will not directly affect the optical fiber unit. The stranded unit uses a new type of plastic coating material TPEE. The optical units are distinguished by different colors. If there are more than 12 optical units, a color bar or color ring scheme is used to distinguish them, which solves the problem of easy identification of ultra-large core number optical units.

[0030] Furthermore, the multifunctional composite sleeve 11 includes EVA material 12, TPU material 13, heat-insulating and fire-resistant material 14, waterproof material 16, and tough ceramic material 15. The tough ceramic material 15 is located on the surface of the waterproof material 16, the waterproof material 16 is located on the surface of the heat-insulating and fire-resistant material 14, the heat-insulating and fire-resistant material 14 is located on the surface of the TPU material 13, and the TPU material 13 is located on the surface of the EVA material 12.

[0031] Furthermore, the sealing reinforcement skeleton ring 10 includes an outer skeleton 17, an epoxy resin sleeve 18, a silicone rubber sheath 19, a middle skeleton 20, a filler sleeve 21, and an inner skeleton 22. The outer skeleton 17 is located on the surface of the epoxy resin sleeve 18, the epoxy resin sleeve 18 is located on the surface of the silicone rubber sheath 19, the silicone rubber sheath 19 is located on the surface of the filler sleeve 21, the filler sleeve 21 is located on the surface of the inner skeleton 22, and the middle skeleton 20 is positioned between the filler sleeve 21 and the silicone rubber sheath 19.

[0032] Furthermore, the optical fiber 2, fiber paste 3, and optical unit TPEE coating layer 4 are sealed and positioned together; the optical unit TPEE coating layer 4 and TPEE optical unit 5 are sealed and positioned together; the secondary coating PBT alloy material 6, water-blocking tape 7, and outer sheath 8 are sealed and positioned together; the secondary coating PBT alloy material 6, water-blocking tape 7, and sealing reinforcement skeleton ring 10 are sealed and positioned together; and the TPEE optical unit 5, secondary coating PBT alloy material 6, and multifunctional composite sleeve 11 are sealed and positioned together.

[0033] Furthermore, the EVA material 12, TPU material 13, heat-insulating and fire-resistant material 14, waterproof material 16, and tough ceramic material 15 are integrally molded by injection molding.

[0034] Furthermore, the outer skeleton 17, epoxy resin sleeve 18, silicone rubber sheath 19, filler sleeve 21, and inner skeleton 22 are integrally molded by injection molding, and the filler sleeve 21, silicone rubber sheath 19 and middle skeleton 20 are sealed and fixed together.

[0035] Furthermore, a manufacturing process for a non-metallic central tube stranded anti-icing optical cable includes the following steps:

[0036] S1: The structural features of the optical cable include TPEE plastic-coated optical units, PBT alloy secondary coating, water-blocking tape, embedded FRP reinforcement, and high flame-retardant outer sheath.

[0037] S2: The TPEE-coated optical unit optimizes the existing extrusion mold and tension settings. The optical unit adopts a 1-tube 2-48 core structure. The optical fiber can be 180um, 200um, or 245um fiber to design TPEE-coated optical units of different structural sizes.

[0038] S3: TPEE optical units of different colors are twisted together or unidirectionally twisted to form a cable core unit. After being filled with fiber paste through an oil-filled mold, a secondary coating layer is extruded. The extruded material is a new type of PBT alloy material.

[0039] S4: The loose tube containing the stranded optical unit is longitudinally wrapped with water-blocking tape and then sheathed. The outer sheath is made of high flame-retardant sheath material. The outer sheath is embedded with 4 parallel FRPs to improve the optical cable's resistance to lateral pressure and its tensile strength and rodent resistance.

[0040] Furthermore, the manufacturing process of the optical cable in steps S1-S4 is as follows: optical fiber storage, optical fiber coloring, TPEE coating, coating of optical units stranding, PBT secondary coating, and embedded FRP outer sheath.

[0041] Working Principle: This invention includes an optical cable body 1, optical fiber 2, fiber grease 3, TPEE optical unit coating layer 4, TPEE optical unit 5, secondary coating PBT alloy material 6, water-blocking tape 7, outer sheath 8, parallel embedded FRP 9, sealing and reinforcing skeleton ring 10, multi-functional composite sleeve 11, EVA material 12, TPU material 13, heat-insulating and fire-resistant material 14, high-toughness ceramic material 15, waterproof material 16, outer skeleton 17, epoxy resin sleeve 18, silicone rubber sheath 19, middle skeleton 20, filling sleeve 21, and inner skeleton 22. The optical units are stranded using a centerless reinforcing member stranding method. After stranding, the cable core is filled with fiber grease and then secondary coated with a high-hardness PBT alloy material. The optical cable has better bending performance and lateral pressure resistance. When the secondary coating layer is squeezed and deformed, it will not directly affect the optical fiber unit. The stranded unit uses a new type of TPEE coating material. Different colors are used to distinguish the optical units. If there are more than 12 optical units, a color bar or color ring scheme is used for differentiation. To solve the problem of easy identification of ultra-large core count optical units, PBT alloy material is used: the secondary coating material is a PBT alloy material made of PC, PBT, and PET mixed in a certain proportion with the addition of plasticizers and other auxiliary materials. This enhances the PBT tube's resistance to lateral pressure and flattening, and improves the cable's breaking strength. In terms of materials, high-foaming TPU modified material has been developed and its extrusion technology has been developed. Because TPU material is soft, after being modified into foamed TPU, the buffer layer it is in has good deformation resilience when deformed, and the foaming degree can reach 80%. When the optical cable is subjected to freezing deformation, there is enough buffer deformation space. When the TPEE optical units are stranded, a centerless reinforcing member stranding method is used. After the stranded cable core is filled with fiber paste, it is coated with a high-hardness PBT alloy material. The loose tube containing the stranded optical units is longitudinally wrapped with water-blocking tape and then the outer sheath is formed. The outer sheath is made of high flame-retardant sheath material. The outer sheath is embedded with 4 parallel FRPs to improve the optical cable's resistance to lateral pressure and its tensile strength and rodent-proof performance.

[0042] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A non-metallic central tube stranded anti-freezing optical cable, comprising an optical cable body (1), characterized in that: The optical cable body (1) includes optical fiber (2), fiber optic paste (3), TPEE optical unit coating layer (4), TPEE optical unit (5), secondary coated PBT alloy material (6), water-blocking tape (7), outer sheath (8), and parallel embedded FRP (9). The outer sheath (8) is located on the outer surface of the water-blocking tape (7), the parallel embedded FRP (9) is located on the outer sheath (8), and the water-blocking tape (7) is located on the outer surface of the secondary coated PBT alloy material (6). Located on the outer surface of the TPEE optical unit (5), the TPEE optical unit (5) is located on the outer surface of the TPEE coating layer (4) of the optical unit, the TPEE coating layer (4) of the optical unit is located on the outside of the optical fiber (2) and the fiber paste (3), a multifunctional composite sleeve (11) is positioned between the TPEE optical unit (5) and the secondary coated PBT alloy material (6), and a sealing reinforcing skeleton ring (10) is positioned between the secondary coated PBT alloy material (6) and the water-blocking tape (7), the multifunctional composite sleeve (11) covers The material comprises EVA material (12), TPU material (13), heat-insulating and refractory material (14), waterproof material (16), and tough ceramic material (15). The tough ceramic material (15) is located on the surface of the waterproof material (16), the waterproof material (16) is located on the surface of the heat-insulating and refractory material (14), the heat-insulating and refractory material (14) is located on the surface of the TPU material (13), and the TPU material (13) is located on the surface of the EVA material (12). The sealing and reinforcing skeleton ring (10) includes an outer skeleton. (17) Epoxy resin sleeve (18), silicone rubber sheath (19), middle skeleton (20), filler sleeve (21) and inner skeleton (22), wherein the outer skeleton (17) is located on the surface of the epoxy resin sleeve (18), the epoxy resin sleeve (18) is located on the surface of the silicone rubber sheath (19), the silicone rubber sheath (19) is located on the surface of the filler sleeve (21), the filler sleeve (21) is located on the surface of the inner skeleton (22), and the middle skeleton (20) is positioned between the filler sleeve (21) and the silicone rubber sheath (19).

2. The non-metallic central tube stranded anti-freezing optical cable according to claim 1, characterized in that: The optical fiber (2), fiber paste (3), and optical unit TPEE coating layer (4) are sealed and positioned together. The optical unit TPEE coating layer (4) and TPEE optical unit (5) are sealed and positioned together. The secondary coating PBT alloy material (6), water-blocking tape (7), and outer sheath (8) are sealed and positioned together. The secondary coating PBT alloy material (6), water-blocking tape (7), and sealing reinforcement skeleton ring (10) are sealed and positioned together. The TPEE optical unit (5), secondary coating PBT alloy material (6), and multifunctional composite sleeve (11) are sealed and positioned together.

3. The non-metallic central tube stranded anti-icing optical cable according to claim 1, characterized in that: The EVA material (12), TPU material (13), heat-insulating and fire-resistant material (14), waterproof material (16), and tough ceramic material (15) are integrally formed by injection molding.

4. The non-metallic central tube stranded anti-icing optical cable according to claim 1, characterized in that: The outer skeleton (17), epoxy resin sleeve (18), silicone rubber sleeve (19), filler sleeve (21), and inner skeleton (22) are integrally formed by injection molding, and the filler sleeve (21), silicone rubber sleeve (19) and middle skeleton (20) are sealed and fixed together.

5. A manufacturing process for a non-metallic central tube stranded anti-freezing optical cable, characterized in that: The following steps are included: S1: The structural features of the optical cable include TPEE plastic-coated optical units, PBT alloy secondary coating, water-blocking tape, embedded FRP reinforcement, high flame-retardant outer sheath, multi-functional composite sheath and sealing reinforcement skeleton ring. S2: The TPEE-coated optical unit optimizes the existing extrusion mold and tension settings. The optical unit adopts a 1-tube 2-48 core structure. The optical fiber can be 180um, 200um, or 245um fiber to design TPEE-coated optical units of different structural sizes. S3: TPEE optical units of different colors are twisted together or unidirectionally twisted to form a cable core unit. After being filled with fiber paste through an oil-filled mold, a secondary coating layer is extruded. The extruded material is a new type of PBT alloy material. S4: The loose tube containing the stranded optical unit is longitudinally wrapped with water-blocking tape and then sheathed. The outer sheath is made of high flame-retardant sheath material. The outer sheath is embedded with 4 parallel FRPs to improve the optical cable's resistance to lateral pressure and its tensile strength and rodent resistance. S5: The outer sheath is a multi-functional composite sheath, which is integrally molded from EVA material, TPU material, heat insulation and fire-resistant material, waterproof material and tough ceramic material through injection molding.

6. The manufacturing process of a non-metallic central tube stranded anti-freezing optical cable according to claim 5, characterized in that: The manufacturing process of the optical cable in steps S1-S5 is as follows: optical fiber storage, optical fiber coloring, TPEE coating, twisting of coated optical units, PBT secondary coating, and embedding of FRP outer sheath.

Images