KR100288444B1 - Metal-free, self-supporting optical cable - Google Patents

Metal-free, self-supporting optical cable Download PDF

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Publication number
KR100288444B1
KR100288444B1 KR1019970077740A KR19970077740A KR100288444B1 KR 100288444 B1 KR100288444 B1 KR 100288444B1 KR 1019970077740 A KR1019970077740 A KR 1019970077740A KR 19970077740 A KR19970077740 A KR 19970077740A KR 100288444 B1 KR100288444 B1 KR 100288444B1
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South Korea
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cable
optical cable
film
pulling line
host
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KR1019970077740A
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Korean (ko)
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KR19990057674A (en
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김병우
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윤종용
삼성전자주식회사
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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
    • G02B6/4434—Central member to take up tensile loads
    • 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

Abstract

PURPOSE: A nonmetal self-supporting optical cable is provided to increase a fractional force and suppress a sliding phenomenon, by inserting a film between a main pulling line and an outer coating. CONSTITUTION: A tube(202) having at least one optical fiber(200) is twisted with the center of a central pulling line(204), and a cable core consists of a film(206) and an inner coating(208). The central pulling line(204) plays a role of a center line of a tube arrangement, and the film(206) prevents a jelly compound from flowing out. The inner coating(208) protects the interior of the cable core from the exterior, and serves as a base support of a main pulling line(210). A binding film(212) makes the main pulling line(210) become close to the cable core, and suppresses a sliding phenomenon between an outer coating(214) and the main pulling line(210) when the high tensile power is forced to an optical cable.

Description

비금속 자기지지형 광 케이블{Metal-free, self-supporting optical cable}Non-metallic Self-Supporting Optical Cables {Metal-free, self-supporting optical cable}

본 발명은 비금속 자기지지형 광 케이블에 관한 것으로, 특히 주인장선과 외부 피복간에 소정의 필름을 구비하여 높은 인장력에도 미끄러지지않는 비금속 자기지지형 광 케이블에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonmetallic self supporting optical cable, and more particularly, to a nonmetal self supporting optical cable having a predetermined film between the host wire and the outer sheath and not slipping even at high tensile force.

광 케이블은 신호를 통과시키는 광섬유를 수용하는 케이블을 일컬으며, 포설 및 운용중 그 광섬유를 보호하는 역할을 하며, 심선수나 옥내/옥외용 등에 따라 여러 가지 구조로 되어 있다.An optical cable is a cable for receiving an optical fiber through which a signal passes, and serves to protect the optical fiber during installation and operation, and has various structures depending on the core bow or indoor / outdoor use.

그중에서 비금속 자기지지형 광섬유 케이블은 가공형 케이블로서 인장강도가 크게 작용하는 케이블 형태로, 일반적으로 철탑과 철탑간의 포설길이가 1000m이상인 장경간에서 인장력이 훨씬 더 커지는 경향이 있다.Among them, non-metallic self-supporting fiber optic cable is a type of cable with a high tensile strength, and generally tends to have a much higher tensile force in a long span of more than 1000 m between the pylon and the pylon.

도 1은 종래의 비금속 자기지지형 광 케이블에 대한 단면도로서, 도 1에 따른 광 케이블은 적어도 하나 이상의 광섬유(100)를 구비하는 튜브(102)가 중심인장선(104)을 중심으로 꼬여져 있고 이 튜브들을 보호하도록 둘러싸는 필름(106) 및 내부 피복(108)으로 이루어진 케이블 코아, 주인장선(110) 및 외부 피복(112)으로 이루어진다. 주인장선(110)은 장경간에서 필요한 인장강도를 확보하기위해 중심인장선(104)과는 별도로 고강도 인장섬유류를 이용하여 형성된다.1 is a cross-sectional view of a conventional non-metal self-supporting optical cable, wherein the optical cable according to FIG. 1 is twisted about a center tensile line 104 with a tube 102 having at least one optical fiber 100. It consists of a cable core consisting of a film 106 and an inner sheath 108, a lead wire 110 and an outer sheath 112, which surround the tubes to protect them. The host ship 110 is formed using high-strength tensile fibers separately from the central tension line 104 to secure the required tensile strength in the long span.

그러나, 장경간에서 요구되는 고인장력의 케이블에서는 그 강도에서 주인장선(110)과 외부 피복(112)간의 미끄러짐(slip) 현상때문에 설치 후 케이블에 걸리는 외부 하중을 주인장선(110)으로 전달하는 것이 불가능해져 결국 외부 피복이 파탄되는 결과를 가져온다.However, in the cable of high tensile strength required in the long span, the external load applied to the cable after installation is transferred to the host ship 110 due to the slip phenomenon between the host ship 110 and the outer sheath 112 in its strength. This becomes impossible and results in the outer covering breaking down.

이러한 문제점을 해결하기 위해 종래에는 주인장선(110)과 외부 피복(112)사이에 바인딩 섬유(binding thread)를 사용하여 주인장선(110)을 케이블 코아에 밀착하도록 하였다.In order to solve this problem, conventionally, the binding line 110 is closely attached to the cable core by using a binding thread between the owner line 110 and the outer sheath 112.

그러나, 상술한 바인드 섬유의 사용은 몇가지 문제점을 초래한다. 즉, 장경간에서 요구되는 고강도 특성의 광 케이블을 실현하기 위해서는 바인드 섬유를 상당히 촘촘하게 적용해야만 높은 인장강도에서 인장선과 피복사이의 미끄러짐 현상을 방지할 수 있으며, 이에 따라 바인딩 섬유를 조밀하게 하면 작업선속의 하향이 불가피하여 생산성이 저하된다. 또한, 생산 설비의 한계로 인해 제품생산에 한계가 있게 된다.However, the use of the bind fibers described above causes some problems. In other words, in order to realize the high-strength optical cable required in the long span, it is necessary to apply the bind fiber very tightly to prevent the sliding phenomenon between the tensile line and the sheath at high tensile strength. Down is inevitable, and productivity is reduced. In addition, there is a limit to the production of the product due to the limitation of the production equipment.

본 발명이 이루고자하는 기술적 과제는 주인장선이 케이블 코아에 밀착하도록 하기위해 주인장선과 외부 피복간에 바인딩 필름을 장착하는 비금속 자기지지형 광 케이블을 제공하는데 있다.The technical problem to be achieved by the present invention is to provide a non-metallic self-supporting optical cable that is equipped with a binding film between the host and the outer sheath in order for the host to be in close contact with the cable core.

도 1은 종래의 광 케이블에 대한 단면도이다.1 is a cross-sectional view of a conventional optical cable.

도 2는 본 발명에 따른 비금속 자기지지형 광 케이블에 대한 단면도이다.2 is a cross-sectional view of a nonmetallic self-supporting optical cable according to the present invention.

상기 기술적 과제를 달성하기 위한, 본 발명은 적어도 한 가닥의 광섬유를 구비하는 적어도 한 개의 튜브가 중심선을 중심으로 꼬여있는 케이블 코아, 상기 케이블 코아에 밀착되는 주인장선 및 상기 주인장선을 감싸는 외부 피복을 포함하는 광 케이블에 있어서, 상기 주인장선과 상기 외부 피복 사이에 위치하여, 상기 광 케이블에 인장력이 작용할 때 상기 주인장선과 상기 외부 피복 간의 미끄러짐을 방지하는 소정 재질의 필름을 더 포함한다.In order to achieve the above technical problem, the present invention provides a cable core having at least one tube having at least one strand of optical fiber twisted about a center line, a host wire in close contact with the cable core and an outer sheath surrounding the host wire. In the optical cable comprising, the film further comprises a film of a predetermined material which is located between the host cable and the outer sheath, and prevents the slip between the host cable and the outer sheath when a tensile force is applied to the optical cable.

이하에서 첨부된 도면을 참조하여 본 발명의 일실시예를 보다 상세히 설명하기로 한다. 도 2는 본 발명에 따른 비금속 자기지지형 광 케이블에 대한 단면도로서, 도 2에 따른 광 케이블은 적어도 하나 이상의 광섬유(200)를 구비하는 튜브(202)가 중심인장선(204)을 중심으로 꼬여져 있고 이 튜브(202)들을 보호하도록 둘러싸는 필름(206) 및 내부 피복(208)으로 이루어진 케이블 코아, 주인장선(210), 바인딩 필름(212) 및 외부 피복(214)으로 이루어진다.Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 2 is a cross-sectional view of a non-metal self-supporting optical cable according to the present invention, in which the tube 202 having at least one optical fiber 200 is twisted about a center tensile line 204. A cable core, a lead 210, a binding film 212, and an outer sheath 214, which are made of a film 206 and an inner sheath 208 that surround and protect the tubes 202.

튜브(202)내부로의 수분침투를 방지하기하도록 구비된 젤리 컴파운드는 광섬유(200)간 마찰을 방지한다. 이 때, 각 광섬유(200)는 전도성이 없는 아크릴 코팅 광섬유가 바람직하다. 튜브(202)의 재질은 내부 광섬유(200)를 보호하고 고강도 플라스틱이 바람직하며, 각 튜브(202)와 중심인장선(206) 사이는 수분침투 방지를 위해 젤리 컴파운드로 채워짐이 바람직하다. 중심인장선(204)은 튜브(202) 배열의 중심선 역할을 하며 꺽임을 방지하는 유리 섬유 강화 플라스틱(Fiber glass Reinforced Plastics) 또는 지알피(GRP) 계열의 소재가 바람직하다. 필름(206)은 젤리 컴파운드의 외부 유출을 막는다. 내부 피복(208)은 외부로부터 케이블 코아의 내부를 보호하며 주인장선(210)의 밑받침대로서의 역할을 한다.The jelly compound provided to prevent moisture penetration into the tube 202 prevents friction between the optical fibers 200. At this time, each optical fiber 200 is preferably an acrylic coated optical fiber without conductivity. The material of the tube 202 is preferably a high strength plastic to protect the internal optical fiber 200, and is preferably filled with a jelly compound between each tube 202 and the central tensile line 206 to prevent moisture penetration. The center tensile line 204 is preferably a glass fiber reinforced plastics or GRP-based material that serves as a center line of the tube 202 arrangement and prevents bending. The film 206 prevents the outflow of the jelly compound. The inner sheath 208 protects the inside of the cable core from the outside and serves as the underlay of the host ship 210.

주인장선(210)은 아라미드(aramid) 섬유로 구성되어 광 케이블에 작용하는 인장력을 지탱하며, 이중층으로 형성되어 포설시 또는 포설후에 광 케이블이 회전되지 않도록한다. 이 때 이 아라미드 섬유로의 수분침투를 방지하기 위해 전체 아라미드 섬유중 방수용 아라미드 섬유를 최소 20%이상 사용한다. 통상적으로, 광 케이블에는 광 케이블 자체 무게 및 바람에 의한 풍압 하중, 빙설에 의한 빙설하중 등이 복합적으로 작용하게 되어 높은 인장력이 작용하게 된다. 이 때 이 아라미드 섬유는 자체 특성상 표면이 상당히 매끈하여 외부 피복(214)과 마찰하여 미끄러짐 현상이 발생하게 된다. 따라서, 높은 인장력이 광 케이블에 작용하더라도 상술한 미끄러짐 현상을 억제할 수 있는 매개체가 필요하며, 본 발명에서는 폴리머 계열의 필름을 바인딩 필름(212)으로 사용한다.Ownership 210 is composed of aramid (aramid) fibers to support the tensile force acting on the optical cable, it is formed in a double layer to prevent the optical cable from rotating during or after installation. At this time, at least 20% of waterproof aramid fibers are used in the whole aramid fibers to prevent water penetration into the aramid fibers. Typically, the optical cable has a high tensile force because the weight of the optical cable itself, the wind pressure load by the wind, the ice snow load by the ice snow, etc. are combined. At this time, the aramid fibers have a very smooth surface due to their characteristics, so that the aramid fibers rub against the outer coating 214 to cause slippage. Therefore, even if a high tensile force acts on the optical cable, a medium capable of suppressing the above-mentioned slippage phenomenon is required. In the present invention, a polymer-based film is used as the binding film 212.

바인딩 필름(212)은 폴리머 계열의 필름으로 주인장선(210)을 케이블 코아에 잘 밀착시키고, 광 케이블에 높은 인장력이 작용할 때 외부 피복(214)과 주인장선(210) 간의 미끄러짐 현상을 억제한다. 즉, 이 폴리머 계열의 필름은 외부 피복의 압출시 작용하는 열에 의해 쉽게 연화되어 상호 접착이 가능한 상태로 변하여 외부 피복재(214)와 주인장선(210) 간의 경계면에 잔류하게 되므로써 광 케이블이 포설된 후 높은 인장강도가 작용할 때 금구류 하단 및 주위에 발생가능한 미끄러짐을 방지한다. 외부 피복(214)의 재질은 트래킹(tracking) 전류에 의한 열화(degradation)를 견딜 수 있는 재질이 바람직하다.The binding film 212 is a polymer-based film that closely adheres to the host cable 210 to the cable core, and suppresses the sliding phenomenon between the outer sheath 214 and the cable holder 210 when a high tensile force is applied to the optical cable. That is, the polymer-based film is easily softened by the heat acting upon the extrusion of the outer coating, and becomes a state of mutual adhesion, and remains at the interface between the outer coating member 214 and the main conductor 210, so that the optical cable is laid. When high tensile strength is applied, it prevents possible slipping around and around the bracket. The material of the outer sheath 214 is preferably a material capable of withstanding degradation due to a tracking current.

본 발명에 의하면, 주인장선과 외부 피복사이에 폴리머 계열의 필름을 삽입하여 마찰력을 증가시켜서 미끄러짐 현상을 억제할 수 있다. 또한, 긴 생산설비를 이용하여 생산하는 경우에도 필름을 간단히 접착할 수 있으므로 광 케이블의 장조장 생산이 가능하므로 원가를 절감할 수 있다.According to the present invention, the sliding phenomenon can be suppressed by increasing the frictional force by inserting a polymer-based film between the host ship and the outer coating. In addition, since the film can be easily bonded even when produced using a long production equipment, it is possible to produce a long length of the optical cable, thereby reducing the cost.

Claims (2)

적어도 한 가닥의 광섬유를 구비하는 적어도 한 개의 튜브가 중심선을 중심으로 꼬여있는 케이블 코아, 상기 케이블 코아에 밀착되는 주인장선 및 상기 주인장선을 감싸는 외부 피복을 포함하는 광 케이블에 있어서,An optical cable comprising: a cable core having at least one tube having at least one strand of optical fiber twisted about a center line, a host cable in close contact with the cable core, and an outer sheath surrounding the host cable; 상기 주인장선과 상기 외부 피복 사이에 위치하고, 상기 외부 피복의 압출시 작용하는 열에 의해 연화되어, 상기 주인장선과 상기 외부 피복 간의 미끄러짐이 방지되도록, 접착이 가능한 상태로 변하는 바인딩 필름을 더 포함하는 것을 특징으로 하는 비금속 자기지지형 광 케이블.And a binding film positioned between the host ship and the outer sheath and softened by heat acting upon extrusion of the outer sheath so as to be prevented from slipping between the host ship and the outer sheath. Non-metal self-supporting optical cable. 제1항에 있어서, 상기 필름은The method of claim 1, wherein the film 폴리머 계열의 재질임을 특징으로하는 비금속 자기지지형 광 케이블.Non-metal self-supporting optical cable characterized by a polymer-based material.
KR1019970077740A 1997-12-30 1997-12-30 Metal-free, self-supporting optical cable KR100288444B1 (en)

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US9091830B2 (en) 2012-09-26 2015-07-28 Corning Cable Systems Llc Binder film for a fiber optic cable
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