Transparent optical cable

Abstract

Relates to a transparent optical cable in the technical field of optical communication, the transparent optical cable comprises an outer sheath (1), an optical fiber (2), a reinforcing member (3) and a hot melt adhesive layer (4), and the optical fiber (2) is embedded in the outer sheath (1). And the reinforcers (3) are embedded in the outer sheath (1) and are positioned around the optical fibers (2). And the hot melt adhesive layer (4) is coated outside the outer sheath (1). The outer sheath (1) and the hot melt adhesive layer (4) are respectively and independently made of transparent and anti-yellowing materials. The reinforcing member (3) is used as a supporting structure to support the outer sheath (1), even if the optical cable is rolled by a heavy object, the optical fiber can be prevented from being damaged, and in addition, the reinforcing member (3) can improve the tensile strength and the bending strength of the whole optical cable. And the hot melt adhesive layer (4) is coated outside the outer sheath (1), and a constructor can complete laying by controlling a traction heating tool in the construction process, so that the operation difficulty of construction is greatly reduced. The outer sheath (1) and the hot melt adhesive layer (4) are respectively and independently made of transparent and anti-yellowing materials, the problem that a current transparent optical cable is prone to yellowing in the long-term use process can be effectively solved, and the long-term use reliability of the transparent optical cable is improved.

Description

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on February 24, 2022, with application number 202210172454.1 and application name “A Transparent Optical Cable”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optical communication technology, and in particular to a transparent optical cable. Background Art

[0003] With the advent of the 5G era of the Internet of Everything, people have put forward higher requirements for home network configuration, and the demand for all-optical home networks is becoming increasingly strong. FTTR (Fiber to the Room) has become a new market opportunity.

[0004] The main problems with transparent optical cables used in existing FTTR scenarios are:

[0005] (1) The strength of the optical cable is low, and it is easy to have problems such as fiber breakage or excessive bending loss during indoor laying and pulling.

[0006] (2) Most optical cables with a certain strength are non-transparent structures, and the outer non-transparent layer needs to be removed before laying.

[0007] (3) The protective layer or outer sheath of the transparent optical cable has extremely poor anti-yellowing performance and is prone to discoloration after being placed for a period of time, seriously affecting the appearance. If anti-yellowing materials are added to the protective layer or outer sheath, the optical cable will be expensive and the transparency will be greatly reduced.

[0008] (4) Transparent optical cables require multi-line operation during use.

[0009] (5) The activation temperature of the heat-activated adhesive layer or hot-melt adhesive layer commonly used in transparent optical cables is relatively low. During transportation or use in places with higher temperatures such as the south, the optical cables are easily stuck together and difficult to separate, causing construction difficulties. Summary of the invention

[0010] The present application provides a transparent optical cable to solve the problems of low strength, non-full transparency, poor anti-yellowing performance, cumbersome laying operation, and easy adhesion between optical cables when the temperature is high, etc. of the transparent optical cable used in the existing FTTR scene.

[0011] The present application provides a transparent optical cable, comprising:

[0012] Outer sheath;

[0013] An optical fiber, embedded in the outer sheath;

[0014] A reinforcement member, embedded in the outer sheath and located around the optical fiber;

[0015] A hot melt adhesive layer, coated on the outer sheath;

[0016] The outer sheath and the hot melt adhesive layer are independently made of transparent and yellowing-resistant materials.

[0017] In this solution, the optical fiber and the reinforcement are embedded in the outer sheath. The outer sheath is used to wrap the optical fiber and the reinforcement, which can prevent the internal optical fiber from being damaged and isolate the contact between the optical fiber and the reinforcement. The reinforcement is located around the optical fiber. As a supporting structure, it supports the outer sheath. Even if it is crushed by heavy objects, it can prevent the optical fiber from being damaged. In addition, the reinforcement can improve the tensile and bending strength of the entire optical cable. During the laying and construction process, the reinforcement can withstand greater construction pressure to avoid excessive construction pressure on the optical fiber and cause damage to the optical fiber. During the indoor laying and traction process, especially when passing through right angles such as wall corners, it can ensure that the optical cable has sufficient support angles to avoid excessive bending losses. The hot melt adhesive layer is coated on the outside of the outer sheath. During the construction process, the construction personnel can complete the laying by controlling the traction heating tool, which is upgraded from multi-line operation to single-line operation, greatly reducing the difficulty of construction operation. The outer sheath and the hot melt adhesive layer are independently made of transparent and anti-yellowing materials, which can effectively solve the problem of yellowing easily occurring during the long-term use of the current transparent optical cable and improve the reliability of the long-term use of the transparent optical cable.

[0018] In a possible design, the transparent and yellowing-resistant material used for the outer sheath is selected from one or more of nylon, nylon elastomer, thermoplastic polyurethane elastomer or thermoplastic polyester elastomer.

[0019] In this solution, the transparent and anti-yellowing material used in the outer sheath has a certain elasticity, which can meet the traction and bending performance of the optical cable during indoor laying, which is conducive to the laying of the optical cable. These materials can also ensure that the outer sheath has high transparency and can ensure the transparency of the optical cable. These materials have stable chemical properties and excellent anti-yellowing properties, which can improve the reliability of transparent optical cables in long-term use.

[0020] In one possible design, the main base material of the nylon elastomer is an aliphatic polyamide containing carbon 6 or carbon 12.

[0021] The nylon elastomer in this solution has excellent anti-yellowing properties, which can effectively solve the problem that the current transparent optical cable is prone to yellowing during long-term use, and improve the reliability of the transparent optical cable in long-term use.

[0022] In a possible design, the hardness of the nylon elastomer is greater than or equal to Shore D30.

[0023] In this solution, the nylon elastomer of such hardness can enhance the outer sheath's ability to resist deformation, thereby effectively preventing the internal optical fiber from being damaged.

[0024] In a possible design, the transparency of the nylon elastomer is greater than or equal to 75%.

[0025] The nylon elastomer of this solution can ensure the transparency of the optical cable.

[0026] In a possible design, the transparent and yellowing-resistant material used in the hot-melt adhesive layer is selected from one or more of polyolefin elastomers, modified thermoplastic polyurethane elastomers or thermoplastic polyesters.

[0027] In this solution, the transparent and anti-yellowing materials used in the hot melt adhesive layer have high transparency and can ensure the transparency of the optical cable. These materials have excellent anti-yellowing performance and can effectively solve the problem that the current transparent optical cable is prone to yellowing during long-term use, and improve the reliability of long-term use of transparent optical cables. These materials have high viscosity and can firmly lay the transparent optical cable on the construction surface during construction.

[0028] In a possible design, the modified thermoplastic polyurethane elastomer is modified from a thermoplastic polyurethane elastomer having a melting temperature of 90° C.-130° C. and a melt index range of 5 g / 10 min-50 g / 10 min.

[0029] In this solution, the activation temperature of such modified thermoplastic polyurethane elastomer is higher than 50°C, and it has good high temperature resistance, which can effectively prevent the transparent optical cable from sticking together and being difficult to separate when used in a high temperature environment, thus ensuring the smooth progress of the construction. At the same time, such modified thermoplastic polyurethane elastomer has stable chemical properties, can effectively resist yellowing, and improve the reliability of the transparent optical cable in long-term use.

[0030] In a possible design, the hot melt adhesive layer and the outer sheath are formed by secondary extrusion.

[0031] In this solution, the secondary extrusion molding technology is used to make the hot melt adhesive layer evenly coated on the outer sheath, which can effectively avoid the unsightly situation caused by uneven hot melt adhesive laying due to unstable operation of construction workers.

[0032] In a possible design, the reinforcement is a metal reinforcement or a transparent non-metal reinforcement.

[0033] In a possible design, the Young's modulus of the reinforcement is greater than or equal to 10 GPa.

[0034] In this solution, by limiting the Young's modulus of the reinforcement, the deformation resistance of the transparent optical cable can be improved.

[0035] In a possible design, the diameter of the reinforcement is greater than 0 and less than or equal to 0.5 mm.

[0036] In this solution, by limiting the diameter of the reinforcement member, the transparency of the transparent optical cable can be ensured, making the reinforcement member 3 difficult to be discovered, and at the same time the strength of the transparent optical cable can be ensured, so that the tension during laying can be increased to more than 150N.

[0037] In a possible design, the number of the reinforcement members is one or more.

[0038] In a possible design, the distance between the reinforcement member and the optical fiber is greater than or equal to 0.1 mm.

[0039] In this solution, by limiting the distance between the reinforcement member and the optical fiber, it can be ensured that the optical fiber can be pulled and bent normally during the laying process.

[0040] In a possible design, there are multiple reinforcement members; the multiple reinforcement members are arranged around the optical fiber or arranged side by side on both sides of the optical fiber.

[0041] In this solution, by designing multiple reinforcement members, the strength of the transparent optical cable can be better increased and the tensile performance can be improved. By arranging multiple reinforcement members around the optical fiber or arranging them side by side on both sides of the optical fiber, the uniformity of the overall strength of the transparent optical cable can be ensured.

[0042] In a possible design, a first tearing groove is provided on the hot melt adhesive layer.

[0043] In this solution, the design of the first tearing groove facilitates tearing the hot melt adhesive layer so as to separate the optical fiber in the outer sheath.

[0044] In a possible design, a second tear groove is formed on the outer sheath.

[0045] In this solution, the outer sheath is easily torn open through the second tearing groove, so as to separate the optical fiber in the outer sheath.

[0046] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic structural diagram of a transparent optical cable provided by the present application in a first embodiment;

[0048] Figure 2 A schematic structural diagram of a transparent optical cable provided by the present application in a second embodiment;

[0049] Figure 3A schematic structural diagram of a transparent optical cable provided by the present application in a third embodiment;

[0050] Figure 4 This is a schematic structural diagram of a transparent optical cable provided in the present application in a fourth embodiment.

[0051] Reference numerals:

[0052] 1-Outer sheath;

[0053] 2- Fiber optics;

[0054] 3-Reinforcement;

[0055] 4-hot melt adhesive layer;

[0056] 5- first tear groove;

[0057] 6- Second tear groove.

[0058] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0059] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0060] There are usually two types of optical cable laying demand scenarios for FTTR. One is the pre-installation scenario commonly used in newly built houses such as fine-decorated houses and rough-finished houses. In the pre-installation scenario, optical fiber cables can be laid in the ducts in advance while the optical cable ducts are being laid. The other is the post-installation scenario after the duct laying for the overall home decoration is completed.

[0061] The embodiment of the present application provides a transparent optical cable, which can be used in the pre-installation scenario of FTTR optical cable deployment, can be laid through the pipeline, and is completely invisible in the home decoration. The transparent optical cable can also be used in the post-installation scenario of FTTR optical cable deployment, without destroying the original home decoration, and can be invisible and beautiful and not easily noticed in daily life.

[0062] According to some specific embodiments of the present application, Figure 1As shown, the present application provides a transparent optical cable, which includes an outer sheath 1, an optical fiber 2, a reinforcing member 3 and a hot melt adhesive layer 4. The cross section of the outer sheath 1 can be circular, square, triangular, etc. The optical fiber 2 can be 1-4 cores, or more cores. The optical fiber 2 and the reinforcing member 3 are both embedded in the outer sheath 1. The outer sheath 1 is used to wrap the optical fiber 2 and the reinforcing member 3, which can prevent the internal optical fiber 2 from being damaged and can also isolate the contact between the optical fiber 2 and the reinforcing member 3. The reinforcing member 3 is located around the optical fiber 2. As a supporting structure, it supports the outer sheath 1. Even if it is crushed by a heavy object, it can prevent the optical fiber 2 from being damaged. In addition, the reinforcing member 3 can improve the tensile and bending strength of the entire optical cable. During the laying and construction process, the reinforcing member 3 can withstand greater construction pressure to prevent excessive construction pressure from acting on the optical fiber 2 and causing damage to the optical fiber 2. During the indoor laying and traction process, especially when passing through right angles such as wall corners, it can ensure that the optical cable has sufficient support angles to avoid excessive bending losses. The hot melt adhesive layer 4 is coated on the outer sheath 1. During the construction process, the construction personnel can complete the laying by controlling the traction heating tool, which is improved from multi-line operation to single-line operation, greatly reducing the construction operation difficulty. The outer sheath 1 and the hot melt adhesive layer 4 are independently made of transparent and anti-yellowing materials, which can effectively solve the problem that the current transparent optical cable is prone to yellowing during long-term use, and improve the reliability of the transparent optical cable in long-term use.

[0063] According to some specific embodiments of the present application, the transparent and anti-yellowing material used in the outer sheath 1 can be selected from one or more of nylon, nylon elastomer, thermoplastic polyurethane elastomer or thermoplastic polyester elastomer. These materials have a certain elasticity, can meet the traction and bending performance of the optical cable during indoor laying, and are conducive to the laying of the optical cable. These materials can also ensure that the outer sheath 1 has high transparency and can ensure the transparency of the optical cable. These materials have stable chemical properties and excellent anti-yellowing properties, which can improve the reliability of transparent optical cables in long-term use.

[0064] Specifically, nylon is a general term for thermoplastic resins containing repeating amide groups -[NHCO]- on the main chain of the molecule, referred to as PA (Polyamide). In some specific embodiments, PA can be PA6, PA66, PA12, PA610, PA612, etc.

[0065] Nylon elastomer is a block copolymer with polyether as the soft segment and polyamide as the hard segment. It is a type of elastomer that has the elasticity of rubber at room temperature and can be plasticized and molded at high temperature.

[0066] Thermoplastic polyurethane elastomer, referred to as TPU (Thermoplastic polyurethane), is a (AB) n type block linear polymer, A is a high molecular weight (1000 ~ 6000) polyester or polyether, B is a diol containing 2 to 12 straight-chain carbon atoms, and the chemical structure between the AB segments is diisocyanate. Thermoplastic polyurethane rubber is cross-linked by intermolecular hydrogen bonds or light cross-linking between macromolecular chains. These two cross-linking structures are reversible as the temperature rises or falls. In the molten state or solution state, the intermolecular force is weakened, and after cooling or solvent evaporation, the strong intermolecular force connects them together, restoring the original solid performance. At the same time, stable chemical properties

[0067] Thermoplastic polyester elastomer, referred to as TPEE (Thermoplastic Elastomer, Ether-Ester), is a type of linear block copolymer containing PBT (Polybutylene terephthalate, polybutylene terephthalate) polyester hard segment and aliphatic polyester or polyether soft segment. TPEE combines the excellent elasticity of rubber and the easy processing of thermoplastics, with adjustable hardness and design freedom.

[0068] According to some specific embodiments of the present application, the main base material of the nylon elastomer is an aliphatic polyamide containing carbon 6 or carbon 12. These types of nylon elastomers have excellent anti-yellowing properties, which can effectively solve the problem of yellowing that is prone to occur during long-term use of current transparent optical cables, and improve the reliability of long-term use of transparent optical cables. Specifically, the aliphatic polyamide containing carbon 6 or carbon 12 can be PA6, PA66, PA12, PA610, PA612, etc. In addition to the aliphatic polyamide containing carbon 6 or carbon 12, the main base material of the nylon elastomer also includes polyether. Such a nylon elastomer uses polyether as a soft segment and polyamide as a hard segment, so that the outer sheath 1 has a certain elasticity and more stable chemical properties, so that the outer sheath 1 has more excellent anti-yellowing properties.

[0069] According to some specific embodiments of the present application, the hardness of the nylon elastomer is greater than or equal to Shore D30, and the nylon elastomer with such hardness can improve the ability of the outer sheath 1 to resist deformation, thereby effectively preventing damage to the internal optical fiber 2. In some specific embodiments, the hardness of the nylon elastomer is Shore D70.

[0070] According to some specific embodiments of the present application, the transparency of the nylon elastomer is greater than or equal to 75%, which can ensure the transparency of the optical cable.

[0071] According to some specific embodiments of the present application, the transparent and yellowing-resistant material used in the hot melt adhesive layer 4 is selected from one or more of polyolefin elastomers, modified thermoplastic polyurethane elastomers or thermoplastic polyesters. These materials have high transparency and can ensure the transparency of the optical cable. These materials have excellent anti-yellowing performance and can effectively solve the problem that the current transparent optical cable is prone to yellowing during long-term use, and improve the reliability of the long-term use of the transparent optical cable. These materials have high viscosity and can firmly lay the transparent optical cable on the construction surface during construction.

[0072] Specifically, polyolefin elastomer is a high-performance polyolefin, which is rubber-elastic at room temperature and has the characteristics of low density, large bending, high low-temperature impact resistance, easy processing, and reusability. The polyolefin elastomer can be specifically POE (Polyaltha Olfin, polyethylene octene copolymer elastomer).

[0073] Modified thermoplastic polyurethane elastomer is a type of elastomer modified from thermoplastic polyurethane elastomer. In some specific embodiments, the modified thermoplastic polyurethane elastomer is modified from a thermoplastic polyurethane elastomer with a melting temperature of 90°C-130°C and a melt index range of 5g / 10min-50g / 10min. The activation temperature of such a modified thermoplastic polyurethane elastomer is higher than 50°C. In some specific embodiments, its activation temperature is above 65°C. It has good high temperature resistance and can effectively prevent transparent optical cables from sticking together and being difficult to separate when used in a high temperature environment, thereby ensuring smooth construction. At the same time, such a modified thermoplastic polyurethane elastomer has stable chemical properties, can effectively resist yellowing, and improve the reliability of transparent optical cables in long-term use.

[0074] According to some specific embodiments of the present application, the hot melt adhesive layer 4 and the outer sheath 1 are formed by secondary extrusion molding. The secondary extrusion molding technology can make the hot melt adhesive layer 4 evenly coated on the outer sheath 1, which can effectively avoid the unsightly appearance caused by uneven hot melt adhesive laying due to the unstable operation of the construction personnel.

[0075] According to some specific embodiments of the present application, the reinforcement member 3 is a metal reinforcement member or a transparent non-metal reinforcement member. Specifically, the metal reinforcement member can be a steel wire, a stainless steel wire, a copper alloy wire, a tungsten wire, an aluminum alloy wire, a magnesium alloy wire, a titanium alloy wire, etc., and the transparent non-metal reinforcement member can be a glass optical fiber, a glass fiber, a polymer elastomer, etc.

[0076] According to some specific embodiments of the present application, in order to improve the deformation resistance of the transparent optical cable, the Young's modulus of the reinforcement 3 is generally greater than or equal to 10 GPa. In order to ensure the transparency of the transparent optical cable and make the reinforcement 3 difficult to be found, while ensuring the strength of the transparent optical cable so that the tension can be increased to more than 150N during laying, the diameter of the reinforcement 3 is limited to be greater than 0 and less than or equal to 0.5 mm. In order to ensure that the optical fiber 2 can be pulled and bent normally during the laying process, the spacing between the reinforcement 3 and the optical fiber 2 is greater than or equal to 0.1 mm. The number of reinforcements 3 can be one or more. In order to better increase the strength of the transparent optical cable and improve the tensile performance, the number of reinforcements 3 can be multiple. In order to ensure the uniformity of the overall strength of the transparent optical cable and better protect the optical fiber 2 from damage, multiple reinforcements 3 can be as follows Figure 2 As shown, the plurality of reinforcing members 3 may be arranged around the optical fiber 2 as shown. Figure 1 As shown, they are arranged side by side on both sides of the optical fiber 2.

[0077] According to some specific embodiments of the present application, Figure 3 and Figure 4 As shown, a first tearing groove 5 is provided on the hot melt adhesive layer 4 . The design of the first tearing groove 5 facilitates tearing the hot melt adhesive layer 4 so as to separate the optical fiber 2 in the outer sheath 1 .

[0078] According to some specific embodiments of the present application, Figure 3 and Figure 4 As shown, a second tearing groove 6 is provided on the outer sheath 1 , and the outer sheath 1 can be easily torn open through the second tearing groove 6 , so as to separate the optical fiber 2 in the outer sheath 1 .

[0079] The present application is described in detail by specific embodiments. In the following embodiments and comparative examples, the performance comparison of the materials used for the outer sheath 1 is shown in Table 1, and the performance comparison of the materials used for the hot melt adhesive layer 4 is shown in Table 2, wherein the yellowing resistance can be tested with reference to the ISO4892-2 indoor standard.

[0080] Table 1 Comparison of outer sheath materials

[0081] Yellowing resistance (UV) / h Tensile strength / MPa Temperature resistance / ℃ Shear strength / MPa transparency / % PVC 100 10-15 80-90 6-10 90 TPU 100 25-30 180-200 9-15 50 PA66 500 38-42 180-210 13-19 80 Nylon Elastomer 1000 40-45 180-210 17-25 80

[0082] Table 2 Hot melt adhesive layer material comparison table

[0083]

[0084]

[0085] Example 1

[0086] This embodiment provides a transparent optical cable, such as Figure 3As shown, the transparent optical cable includes an outer sheath 1, an optical fiber 2, a reinforcing member 3 and a hot melt adhesive layer 4. The optical fiber 2 and the reinforcing member 3 are both embedded in the outer sheath 1, the reinforcing member 3 is located around the optical fiber 2, and the hot melt adhesive layer 4 is coated on the outer sheath 1. The outer sheath 1 adopts the nylon elastomer material in Table 1, and the hot melt adhesive layer 4 adopts the modified TPU material in Table 2.

[0087] Example 2

[0088] In this embodiment, the outer sheath 1 is made of the nylon elastomer material in Table 1, the hot melt adhesive layer 4 is made of the PET material in Table 2, and other technical solutions are the same as those in Embodiment 1.

[0089] Example 3

[0090] In this embodiment, the outer sheath 1 adopts the nylon elastomer material in Table 1, the hot melt adhesive layer 4 adopts the POE material in Table 2, and other technical solutions are the same as those in Embodiment 1.

[0091] Example 4

[0092] In this embodiment, the outer sheath 1 adopts PA66 in Table 1, the hot melt adhesive layer 4 adopts the modified TPU material in Table 2, and other technical solutions are the same as those in Example 1.

[0093] Example 5

[0094] In this embodiment, the outer sheath 1 is made of PA66 in Table 1, the hot melt adhesive layer 4 is made of PET material in Table 2, and other technical solutions are the same as those in Example 1.

[0095] Example 6

[0096] In this embodiment, the outer sheath 1 adopts the PA66 in Table 1, the hot melt adhesive layer 4 adopts the POE material in Table 2, and other technical solutions are the same as those in Example 1.

[0097] Comparative Example 1

[0098] In this comparative example, the outer sheath 1 is made of the PA66 material in Table 1, the hot melt adhesive layer 4 is made of the EVA material in Table 2, and other technical solutions are the same as those in Example 1.

[0099] Comparative Example 2

[0100] In this comparative example, the outer sheath 1 is made of the TPU material listed in Table 1, the hot melt adhesive layer 4 is made of the EVA material listed in Table 2, and other technical solutions are the same as those in Example 1.

[0101] Comparative Example 3

[0102] In this embodiment, the outer sheath 1 adopts the nylon elastomer material in Table 1, the hot melt adhesive layer 4 adopts the EVA material in Table 2, and other technical solutions are the same as those in Example 1.

[0103] Comparative Example 4

[0104] In this embodiment, the outer sheath 1 is made of PVC material in Table 1, the hot melt adhesive layer 4 is made of EVA material in Table 2, and other technical solutions are the same as those in Embodiment 1.

[0105] Comparative Example 5

[0106] In this embodiment, the outer sheath 1 adopts the PVC material listed in Table 1, the hot melt adhesive layer 4 adopts the modified TPU material listed in Table 2, and other technical solutions are the same as those in Embodiment 1.

[0107] Comparative Example 6

[0108] In this embodiment, the outer sheath 1 adopts the TPU material in Table 1, the hot melt adhesive layer 4 adopts the modified TPU material in Table 2, and other technical solutions are the same as those in Embodiment 1.

[0109] Comparative Example 7

[0110] In this embodiment, the outer sheath 1 is made of PVC material in Table 1, the hot melt adhesive layer 4 is made of POE material in Table 2, and other technical solutions are the same as those in Embodiment 1.

[0111] Comparative Example 8

[0112] In this embodiment, the outer sheath 1 is made of PVC material in Table 1, the hot melt adhesive layer 4 is made of PET material in Table 2, and other technical solutions are the same as those in Embodiment 1.

[0113] Comparative Example 9

[0114] In this embodiment, the outer sheath 1 adopts the TPU material listed in Table 1, the hot melt adhesive layer 4 adopts the POE material listed in Table 2, and other technical solutions are the same as those in Embodiment 1.

[0115] Comparative Example 10

[0116] In this embodiment, the outer sheath 1 adopts the TPU material listed in Table 1, the hot melt adhesive layer 4 adopts the PET material listed in Table 2, and other technical solutions are the same as those in Embodiment 1.

[0117] The transparent optical cables of Examples 1-6 and Comparative Examples 1-4 were tested for yellowing resistance, temperature resistance and tensile strength. The test results are shown in Table 3 below.

[0118] Table 3 Transparent optical cable performance comparison

[0119]

[0120] It can be seen from the experimental results in Table 3 that the transparent optical cable of the present application has excellent yellowing resistance, high temperature resistance and excellent tensile strength. In particular, with nylon elastomer material as the outer sheath 1 and modified TPU material as the hot melt adhesive layer 4, the yellowing resistance of the transparent optical cable reaches 500h, the tensile strength reaches 38-42MPa, the bonding force reaches 6-8N, the transparency reaches 80%, and the bonding temperature resistance reaches 70℃-85℃. Such a transparent optical cable has good transparency, is not prone to yellowing during long-term use, is not prone to bending loss, is easy to lay, and will not stick when used or transported in a high temperature environment. Compared with PVC or TPU as the outer sheath 1, the transparent optical cable prepared with PA66 and nylon elastomer as the outer sheath has better yellowing resistance and tensile strength. Compared with EVA as the hot melt adhesive layer 4, the transparent optical cable prepared with PET, POE and modified TPU as the hot melt adhesive layer 4 has better bonding temperature resistance, and the bonding temperature resistance is above 50°C, which can effectively prevent the transparent optical cable from sticking when used or transported in a high temperature environment.

[0121] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A transparent optical cable, characterized in that: include: An outer sheath (1); An optical fiber (2) is embedded in the outer sheath (1); A reinforcing member (3) embedded in the outer sheath (1) and located around the optical fiber (2); A hot melt adhesive layer (4) is coated on the outside of the outer sheath (1); The outer sheath (1) and the hot melt adhesive layer (4) are each independently made of a transparent and yellowing resistant material.

2. The transparent optical cable according to claim 1, characterized in that: The transparent and yellowing-resistant material used in the outer sheath (1) is selected from one or more of nylon, nylon elastomer, thermoplastic polyurethane elastomer or thermoplastic polyester elastomer.

3. The transparent optical cable according to claim 2, characterized in that: The nylon elastomer satisfies at least one of the following characteristics (1) to (3): (1) The main base material of the nylon elastomer is an aliphatic polyamide containing carbon 6 or carbon 12; (2) The hardness of the nylon elastomer is greater than or equal to Shore D30; (3) The transparency of the nylon elastomer is greater than or equal to 75%.

4. The transparent optical cable according to claim 1, characterized in that: The transparent and yellowing-resistant material used in the hot-melt adhesive layer (4) is selected from one or more of polyolefin elastomers, modified thermoplastic polyurethane elastomers or thermoplastic polyesters.

5. The transparent optical cable according to claim 4, characterized in that: The modified thermoplastic polyurethane elastomer is modified from a thermoplastic polyurethane elastomer with a melting temperature of 90° C.-130° C. and a melting index range of 5 g / 10 min.-50 g / 10 min.

6. The transparent optical cable according to claim 1, characterized in that: The hot melt adhesive layer (4) and the outer sheath (1) are formed by secondary extrusion.

7. The transparent optical cable according to claim 1, characterized in that: The reinforcement member (3) is a metal reinforcement member or a transparent non-metal reinforcement member.

8. The transparent optical cable according to claim 7, characterized in that: The reinforcement member (3) satisfies at least one of the following characteristics (1) to (4): (1) The Young's modulus of the reinforcement (3) is greater than or equal to 10 GPa; (2) The diameter of the reinforcement member (3) is greater than 0 and less than or equal to 0.5 mm; (3) The number of the reinforcement member (3) is one or more; (4) The distance between the reinforcement member (3) and the optical fiber (2) is greater than or equal to 0.1 mm.

9. The transparent optical cable according to claim 8, characterized in that: The number of the reinforcing members (3) is plural; the plural reinforcing members (3) are arranged around the optical fiber (2) or arranged side by side on both sides of the optical fiber (2).

10. The transparent optical cable according to claim 1, characterized in that: The hot melt adhesive layer (4) is provided with a first tearing groove (5).

11. The transparent optical cable according to claim 1, characterized in that: The outer sheath (1) is provided with a second tearing groove (6).

Images