WO2020063801A1 - 一体化光缆及其制造工艺 - Google Patents

一体化光缆及其制造工艺 Download PDF

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Publication number
WO2020063801A1
WO2020063801A1 PCT/CN2019/108359 CN2019108359W WO2020063801A1 WO 2020063801 A1 WO2020063801 A1 WO 2020063801A1 CN 2019108359 W CN2019108359 W CN 2019108359W WO 2020063801 A1 WO2020063801 A1 WO 2020063801A1
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Prior art keywords
optical cable
optical fiber
sheath
layer
integrated optical
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PCT/CN2019/108359
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English (en)
French (fr)
Inventor
王宇亮
林卫峰
蒋北
刘沛东
朱凯
高峰
沈智峰
葛涛
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Hengtong Optic Electric Co Ltd
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Hengtong Optic Electric Co Ltd
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Priority to EP19850750.1A priority Critical patent/EP3674763A4/en
Publication of WO2020063801A1 publication Critical patent/WO2020063801A1/zh
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G02B6/4432—Protective covering with fibre reinforcements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4479—Manufacturing methods of optical cables
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4479—Manufacturing methods of optical cables
    • G02B6/4482—Code or colour marking

Definitions

  • the invention relates to the field of optical cables, in particular to integrated optical cables and manufacturing processes thereof.
  • liquid crystal polymer materials have been attempted as reinforcing materials in telecommunication cables or special optical cables because of their self-reinforcement, excellent thermal stability, heat resistance and weather resistance.
  • ADC Telecom's Cachmar used the method of embedding LCP shrinkage in a thermoplastic base material to reduce the shrinkage of the material while enhancing the mechanical properties.
  • this method still has LCP and conventional Problems with material compatibility and extrusion processes.
  • Chen Bingyan et al. Disclose a new type of high-temperature optical cable suitable for special fields composed of tight-packed optical fiber, loose tube and LCP sheath.
  • This new type of optical cable is not suitable for promotion because it uses a variety of special materials for a single application field.
  • Qiu Bin et al. Used a new method of covering LCP material on the surface of the optical fiber and then coating it with polyvinylidene fluoride and a low-smoke halogen-free material.
  • This new type of single-core low-smoke Halogen cables also have problems of large size and high material consumption.
  • the present invention provides an integrated optical cable, which has a simple and compact structure and adopts an integrated design solution, which can be used in a variety of indoor and outdoor scenarios to meet most needs.
  • the present invention also provides an integrated optical cable. Manufacturing process.
  • an integrated optical cable includes an optical fiber and a sheath provided on the outside of the optical fiber, and a reinforcing layer is further provided between the optical fiber and the sheath.
  • a reinforcing layer made of an LCP material, and the tensile modulus of the LCP material is greater than 10 GPa.
  • a buffer layer is further provided between the optical fiber and the reinforcing layer, and the buffer layer is made of any one of TPEE or high-temperature resistant silicone rubber.
  • the sheath is a sheath made of a high-temperature nylon material.
  • the sheath is made of any one of LSZH, PVC, and PEEK.
  • the wall thickness of the reinforcing layer is 0.2-0.5 mm
  • the wall thickness of the sheath is 0.2-0.5 mm.
  • the wall thickness of the buffer layer is 0.2-0.49 mm.
  • the manufacturing process of the integrated optical cable which is used to manufacture the above-mentioned integrated optical cable, is characterized in that it includes the following steps:
  • Step S1 The optical fiber is put into a warehouse, and the optical fiber that is put into the warehouse is screened, and a qualified optical fiber is selected;
  • Step S2 coloring the optical fiber, and coloring the qualified optical fiber
  • Step S3 a sheath, forming a reinforcing layer and a sheath layer of the optical cable through double-layer co-extrusion on the optical fiber of step S2;
  • Step S4 The optical cable leaves the factory, and the optical cable package made in step S4 leaves the factory;
  • the manufacturing process of the integrated optical cable which is used to manufacture the above-mentioned integrated optical cable, is characterized in that it includes the following steps:
  • Step S1 The optical fiber is put into a warehouse, and the optical fiber that is put into the warehouse is screened, and a qualified optical fiber is selected;
  • Step S2 coloring the optical fiber, and coloring the qualified optical fiber
  • Step S3 secondary coating, extruding on the optical fiber to form a buffer layer
  • Step S4 a sheath, forming a reinforcing layer and a sheath layer of the optical cable through double-layer co-extrusion on the semi-finished product manufactured in step S3;
  • Step S5 The optical cable is shipped from the factory, and the optical cable package made in step S4 is shipped from the factory;
  • the pay-off tension of the optical fiber is controlled to be 70g-90g.
  • the extrusion temperature of the inner reinforcing layer is controlled to be 280 ° C to 350 ° C
  • the extrusion temperature of the outer sheathing layer is controlled to be 300 ° C to 330 ° C
  • the production line speed is controlled 100m / min-300m / min, control the take-up tension of sheath 290g-310g.
  • the integrated optical cable of the present invention adopts a high-modulus liquid crystal polymer LCP as a material for the reinforcing layer, and the LCP tensile modulus is greater than 10 GPa, so that the manufactured compact fiber has high strength, low shrinkage, high temperature resistance, and excellent flame retardancy.
  • the invention instead of the role of the original tight sleeve and aramid reinforcement, to achieve the integration of structure and material; at the same time, the invention achieves the strength of the reinforcing element and the fiber together, reduces the fiber strain and effectively reduces the fiber Risk of reduced life due to stress;
  • the invention can use a high temperature resistant material such as thermoplastic polyester elastomer TPEE or high temperature resistant silicone rubber as an elastic buffer layer to protect the optical fiber from bending; the jacket material can also be used at high temperature
  • the nylon material further guarantees the high temperature resistance, flame retardant and high strength performance of the optical cable, and at the same time gives the optical cable abrasion resistance and coloring properties to meet the needs of most indoor optical cables.
  • the present invention can also use conventional thermoplastic low smoke halogen-free flame retardant Polyolefin LSZH, polyvinyl chloride soft PVC, polyetheretherketone PEEK, etc. are used as sheath materials to meet the needs of indoor optical cables.
  • FIG. 1 is a schematic structural diagram of an integrated optical cable in Embodiment 1.
  • FIG. 1 is a schematic structural diagram of an integrated optical cable in Embodiment 1.
  • FIG. 3 is a schematic structural diagram of an integrated optical cable in a specific embodiment 2;
  • FIG. 4 is a process flowchart of a manufacturing process of the integrated optical cable in the specific embodiment 2.
  • the integrated optical cable of the present invention includes an optical fiber 1 and a sheath 2 provided on the outer side of the optical fiber.
  • a reinforcing layer 3 is further provided between the optical fiber 1 and the sheath 2, and the reinforcing layer 3 is an LCP.
  • the reinforced layer made of material, the wall thickness of the reinforced layer 2 is 0.2-0.5mm, and the wall thickness of the sheath 2 is 0.2-0.5mm.
  • the sheath 2 is a sheath made of a high-temperature nylon material.
  • the sheath 2 may also be made of any one of LSZH, PVC, and PEEK.
  • the above-mentioned integrated optical fiber manufacturing process of the specific embodiment 1 includes the following steps:
  • Step S1 The optical fiber is put into a warehouse, and the optical fiber that is put into the warehouse is screened, and a qualified optical fiber is selected;
  • Step S2 coloring the optical fiber, and coloring the qualified optical fiber
  • Step S3 a sheath, forming a reinforcing layer and a sheath layer of the optical cable through double-layer co-extrusion on the optical fiber of step S2;
  • Step S4 The optical cable leaves the factory, and the optical cable package made in step S4 leaves the factory;
  • the integrated optical cable of the present invention includes an optical fiber 1 and a sheath 2 disposed outside the optical fiber 1.
  • a reinforcing layer 3 is further provided between the optical fiber 1 and the sheath 2.
  • the reinforcing layer 3 is
  • the reinforcement layer made of LCP material is also provided with a buffer layer 4 between the optical fiber 1 and the reinforcement layer 3.
  • the buffer layer 4 is made of any one of TPEE or high temperature resistant silicone rubber.
  • the thickness of the reinforcement layer is 0.2. -0.5mm, the wall thickness of the sheath is 0.2-0.5mm, and the wall thickness of the buffer layer is 0.2-0.49mm.
  • the sheath 2 is a sheath made of a high-temperature nylon material.
  • the sheath 2 may also be made of any one of LSZH, PVC, and PEEK.
  • the above-mentioned integrated optical fiber manufacturing process of the specific embodiment 2 includes the following steps:
  • Step S1 The optical fiber is put into a warehouse, and the optical fiber that is put into the warehouse is screened, and a qualified optical fiber is selected;
  • Step S2 coloring the optical fiber, and coloring the qualified optical fiber
  • Step S3 secondary coating, extruding on the optical fiber to form a buffer layer
  • Step S4 a sheath, forming a reinforcing layer and a sheath layer of the optical cable through double-layer co-extrusion on the semi-finished product manufactured in step S3;
  • Step S5 The optical cable is shipped from the factory, and the optical cable package made in step S4 is shipped from the factory;
  • step S3 the fiber tension is controlled to be 70g-90g.
  • step S4 a double-layer co-extrusion process is used to control the extrusion temperature of the inner reinforcing layer to 280 ° C.
  • the interface between LCP and nylon is adjusted by adjusting the amount of nylon extrusion and the temperature of the extrusion reinforcement layer of the sheath to further enhance the mechanical properties of the optical cable.
  • the integrated optical cable of the present invention adopts a high-modulus liquid crystal polymer LCP as a material for the reinforcing layer, and the LCP tensile modulus is greater than 10 GPa, so that the manufactured compact fiber has high strength, low shrinkage, high temperature resistance, and excellent flame retardancy.
  • the invention instead of the role of the original tight sleeve and aramid reinforcement, to achieve the integration of structure and material; at the same time, the invention achieves the strength of the reinforcing element and the fiber together, reduces the fiber strain and effectively reduces the fiber Risk of reduced life due to stress;
  • the invention can use a high temperature resistant material such as thermoplastic polyester elastomer TPEE or high temperature resistant silicone rubber as an elastic buffer layer to protect the optical fiber from bending; the jacket material can also be used at high temperature
  • the nylon material further guarantees the high temperature resistance, flame retardancy and high strength performance of the optical cable, and at the same time gives the optical cable abrasion resistance and coloring properties to meet the requirements of most indoor optical cables.
  • the present invention can also use conventional thermoplastic low smoke halogen free flame retardant Polyolefin LSZH, polyvinyl chloride soft PVC, polyetheretherketone PEEK, etc. are used as sheath materials to meet the needs of indoor optical cables.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

一种一体化光缆，包括光纤（1）和设置在光纤（1）外侧的护套（2），光纤（1）与护套（2）之间还设置有增强层（3），增强层（3）为高模量LCP材料制成的增强层（3），LCP材料的拉伸模量大于10Gpa。一体化光缆的制造工艺，包括光纤入库、光纤着色、被覆、护套、光缆出厂。制成的光缆结构简单、紧凑、采用一体化设计方案，可以在室内外多种场景中使用，满足大多数需求。

Description

一体化光缆及其制造工艺 技术领域
本发明涉及光缆领域，具体涉及一体化光缆及其制造工艺。
背景技术
随着信息化进程的加快，三网融合推进发展，现已逐步实现人们接入网的高速化、宽度化和智能化的需求。在新的环境条件下，光缆的高性能、小尺寸、耐环境性能成为了新兴的接入网光缆的开发方向。现今紧套材料本身的热膨胀系数高出光纤两个数量级，导致光缆在温度变化下材料收缩，影响光纤的传输性能。同时，减小结构尺寸存在与提升机械性能难以一齐满足的矛盾。此外，传统的纱线类加强件存在与光纤、护套长度不一致的情况，导致光纤当先受力而寿命降低。因此，如何在微小尺寸光纤单元或光缆的设计上，并满足一定机械强度和较好的耐环境性能是非常困难的。
目前，液晶聚合物材料(LCP)因其拥有自增强性、优良的热稳定性、耐热性与耐候性，已经有在电信光缆或特种光缆中作为加强材料的尝试。ADC电信公司的卡奇马尔在公开号为CN101120277A的专利中，采用在热塑性基底材料中内嵌LCP缩小件的方法来减小材料后收缩的同时增强机械性能，然而这种方法尚存在LCP与常规材料相容性和挤出工艺上的问题。在公开号为CN203324533U的专利中中，陈炳炎等公开了紧包光纤、松套管和LCP护套组成的一种适用于特种领域的新型高温光缆。此种新型光缆因使用多种特殊材料，针对应用领域单一，不适于推广。在公开号为CN202171673U的专利中，仇斌等采用LCP材料包覆在光纤表面，再在其外包覆聚偏氟乙烯和低烟无卤材料的新方法，这种新型的单芯低烟无卤光缆也存在尺寸大、材料耗用多的问题。
发明内容
针对上述问题，本发明提供了一体化光缆，其结构简单、紧凑、采用一体化设计方案，可以在室内外多种场景中使用，满足大多数需求，同时，本发明还提供该一体化光缆的制造工艺。
其技术方案是这样的：一体化光缆，其包括光纤和设置在所述光纤外侧的护套，所述光纤与所述护套之间还设置有增强层，其特征在于：所述增强层为LCP材料制成的增强层，所述LCP材料的拉伸模量大于10GPa。
进一步的，在所述光纤与所述增强层之间还设置有缓冲层，所述缓冲层由TPEE或耐高温硅橡胶其中的任意一种材料制成。
进一步的，所述护套为高温尼龙材料制成的护套。
进一步的，所述护套由LSZH、PVC、PEEK其中的任意一种材料制成。
进一步的，所述增强层的壁厚为0.2-0.5mm，所述护套的壁厚为0.2-0.5mm。
进一步的，所述缓冲层的壁厚为0.2-0.49mm。
一体化光缆的制造工艺，用于制造上述的一体化光缆，其特征在于，包括以下步骤：
步骤S1：光纤入库，将入库的光纤进行筛选，选择合格的光纤；
步骤S2：光纤着色，对合格的光纤进行着色；
步骤S3：护套，在步骤S2的光纤上通过双层共挤形成光缆的增强层和护套层；
步骤S4：光缆出厂，将步骤S4中制成的光缆包装出厂；
在步骤S1至步骤S4的每一步骤中，分别进行检测。
一体化光缆的制造工艺，用于制造上述的一体化光缆，其特征在于，包括以下步骤：
步骤S1：光纤入库，将入库的光纤进行筛选，选择合格的光纤；
步骤S2：光纤着色，对合格的光纤进行着色；
步骤S3：二次被覆，在光纤上挤塑形成缓冲层；
步骤S4：护套，在步骤S3制造的半成品上通过双层共挤形成光缆的增强层和护套层；
步骤S5：光缆出厂，将步骤S4中制成的光缆包装出厂；
在步骤S1至步骤S5的每一步骤中，分别进行检测。
进一步的，在步骤S3的二次被覆工艺中，控制光纤放线张力为70g-90g。
进一步的，在步骤S4的护套工艺中，控制内层的增强层的挤塑温度为280℃-350℃，控制外层的护套层的挤塑温度为300℃-330℃，控制生产线速度100m/min-300m/min，控制护套收线张力290g-310g。
本发明的一体化光缆通过选用高模量液晶聚合物LCP作为增强层的材料，LCP拉伸模量大于10GPa，使制得的紧套光纤具有高强度、低收缩、耐高温、优异阻燃性等特性，替代了原有紧套与芳纶加强件的作用，实现了结构与材料的一体化；同时，本发明做到加强元件和光纤一齐受力，减小了光纤应变，有效降低因光纤受力导致寿命降低的风险；此外，本发明可选用热塑性聚酯弹性体TPEE或耐高温硅橡胶等耐高温材料作为弹性缓冲层，用以保护光纤不受弯曲影响；护套材料也可采用高温尼龙材料，进一步保障光缆的耐高温、阻燃、高强度的性能，同时赋予光缆耐磨性以及着色性能，满足绝大部分室内光缆的需求； 本发明也可选用常规热塑性低烟无卤阻燃聚烯烃LSZH、聚氯乙烯软胶PVC、聚醚醚酮PEEK等作为护套材料，满足室内光缆的需求。
附图说明
图1为具体实施例1中的一体化光缆的结构示意图；
图2为具体实施例1中的一体化光缆的制造工艺的工艺流程图；
图3为具体实施例2中的一体化光缆的结构示意图；
图4为具体实施例2中的一体化光缆的制造工艺的工艺流程图。
具体实施方式
具体实施例1：见图1，本发明的一体化光缆，其包括光纤1和设置在光纤外侧的护套2，光纤1与护套2之间还设置有增强层3，增强层3为LCP材料制成的增强层，增强层2的壁厚为0.2-0.5mm，护套2的壁厚为0.2-0.5mm。
在本实施例中，护套2为高温尼龙材料制成的护套，此外，护套2也可以由LSZH、PVC、PEEK其中的任意一种材料制成。
见图2，上述的具体实施例1的一体化光缆制造工艺，包括以下步骤：
步骤S1：光纤入库，将入库的光纤进行筛选，选择合格的光纤；
步骤S2：光纤着色，对合格的光纤进行着色；
步骤S3：护套，在步骤S2的光纤上通过双层共挤形成光缆的增强层和护套层；
步骤S4：光缆出厂，将步骤S4中制成的光缆包装出厂；
在步骤S1至步骤S4的每一步骤中，分别进行检测。
具体实施例2：见图3，本发明的一体化光缆，其包括光纤1和设置在光纤1外侧的护套2，光纤1与护套2之间还设置有增强层3，增强层3为LCP材料制成的增强层，在光纤1与增强层3之间还设置有缓冲层4，缓冲层4由TPEE或耐高温硅橡胶其中的任意一种材料制成，增强层的壁厚为0.2-0.5mm，护套的壁厚为0.2-0.5mm，缓冲层的壁厚为0.2-0.49mm。
在本实施例中，护套2为高温尼龙材料制成的护套，此外，护套2也可以由LSZH、PVC、PEEK其中的任意一种材料制成。
见图4，上述的具体实施例2的一体化光缆制造工艺，包括以下步骤：
步骤S1：光纤入库，将入库的光纤进行筛选，选择合格的光纤；
步骤S2：光纤着色，对合格的光纤进行着色；
步骤S3：二次被覆，在光纤上挤塑形成缓冲层；
步骤S4：护套，在步骤S3制造的半成品上通过双层共挤形成光缆的增强层和护套层；
步骤S5：光缆出厂，将步骤S4中制成的光缆包装出厂；
在步骤S1至步骤S5的每一步骤中，分别进行检测。
在步骤S3的二次被覆工艺中，控制光纤放线张力为70g-90g，在步骤S4的护套工艺中，采用双层共挤的工艺，控制内层的增强层的挤塑温度为280℃-350℃，控制外层的护套层的挤塑温度为300℃-330℃；控制生产线速度100m/min-300m/min，控制护套收线张力290g-310g，设置热水温度65℃-75℃，通过调节护套的尼龙挤塑量与挤塑增强层的温度来调控LCP与尼龙的界面作用，进一步增强光缆的机械性能。
本发明的一体化光缆通过选用高模量液晶聚合物LCP作为增强层的材料，LCP拉伸模量大于10GPa，使制得的紧套光纤具有高强度、低收缩、耐高温、优异阻燃性等特性，替代了原有紧套与芳纶加强件的作用，实现了结构与材料的一体化；同时，本发明做到加强元件和光纤一齐受力，减小了光纤应变，有效降低因光纤受力导致寿命降低的风险；此外，本发明可选用热塑性聚酯弹性体TPEE或耐高温硅橡胶等耐高温材料作为弹性缓冲层，用以保护光纤不受弯曲影响；护套材料也可采用高温尼龙材料，进一步保障光缆的耐高温、阻燃、高强度的性能，同时赋予光缆耐磨性以及着色性能，满足绝大部分室内光缆的需求；本发明也可选用常规热塑性低烟无卤阻燃聚烯烃LSZH、聚氯乙烯软胶PVC、聚醚醚酮PEEK等作为护套材料，满足室内光缆的需求。
以上实施例仅表达了本发明的其中两种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一体化光缆，其包括光纤和设置在所述光纤外侧的护套，所述光纤与所述护套之间还设置有增强层，其特征在于：所述增强层为LCP材料制成的增强层，所述LCP材料的拉伸模量大于10GPa。
  2. 根据权利要求1所述的一体化光缆，其特征在于：在所述光纤与所述增强层之间还设置有缓冲层，所述缓冲层由TPEE或耐高温硅橡胶其中的任意一种材料制成。
  3. 根据权利要求1所述的一体化光缆，其特征在于：所述护套为高温尼龙材料制成的护套。
  4. 根据权利要求1所述的一体化光缆，其特征在于：所述护套由LSZH、PVC、PEEK其中的任意一种材料制成。
  5. 根据权利要求1所述的一体化光缆，其特征在于：所述增强层的壁厚为0.2-0.5mm，所述护套的壁厚为0.2-0.5mm。
  6. 根据权利要求2所述的一体化光缆，其特征在于：所述缓冲层的壁厚为0.2-0.49mm。
  7. 一体化光缆的制造工艺，用于制造权利要求1、3、4、5其中任一项所述的一体化光缆，其特征在于，包括以下步骤：
    步骤S1：光纤入库，将入库的光纤进行筛选，选择合格的光纤；
    步骤S2：光纤着色，对合格的光纤进行着色；
    步骤S3：护套，在步骤S2的光纤上通过双层共挤形成光缆的增强层和护套层；
    步骤S4：光缆出厂，将步骤S4中制成的光缆包装出厂；
    在步骤S1至步骤S4的每一步骤中，分别进行检测。
  8. 一体化光缆的制造工艺，用于制造权利要求2、6其中任一项所述的一体化光缆，其特征在于，包括以下步骤：
    步骤S1：光纤入库，将入库的光纤进行筛选，选择合格的光纤；
    步骤S2：光纤着色，对合格的光纤进行着色；
    步骤S3：二次被覆，在光纤上挤塑形成缓冲层；
    步骤S4：护套，在步骤S3制造的半成品上通过双层共挤形成光缆的增强层和护套层；
    步骤S5：光缆出厂，将步骤S4中制成的光缆包装出厂；
    在步骤S1至步骤S5的每一步骤中，分别进行检测。
  9. 根据权利要求8所述的一体化光缆的制造工艺，其特征在于：在步骤S3的二次被覆工艺中，控制光纤放线张力为70g-90g。
  10. 根据权利要求8所述的一体化光缆的制造工艺，其特征在于：在步骤S4的护套工艺中，采用双层共挤的工艺，控制内层的增强层的挤塑温度为280℃-350℃，控制外层的护套层的挤塑温度为300℃-330℃，控制生产线速度100m/min-300m/min，控制护套收线张力290g-310g。
PCT/CN2019/108359 2018-09-28 2019-09-27 一体化光缆及其制造工艺 Ceased WO2020063801A1 (zh)

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