KR100761600B1 - Coaxial cable - Google Patents

Coaxial cable Download PDF

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KR100761600B1
KR100761600B1 KR1020060017657A KR20060017657A KR100761600B1 KR 100761600 B1 KR100761600 B1 KR 100761600B1 KR 1020060017657 A KR1020060017657 A KR 1020060017657A KR 20060017657 A KR20060017657 A KR 20060017657A KR 100761600 B1 KR100761600 B1 KR 100761600B1
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South Korea
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coaxial cable
inner conductor
hollow tube
polyethylene resin
adhesive layer
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KR1020060017657A
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Korean (ko)
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KR20070087347A (en
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이보형
정병관
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엘에스전선 주식회사
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00Communication cables or conductors
    • H01B11/18Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00Communication cables or conductors
    • H01B11/18Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808Construction of the conductors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00Communication cables or conductors
    • H01B11/18Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834Construction of the insulation between the conductors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00Communication cables or conductors
    • H01B11/18Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1869Construction of the layers on the outer side of the outer conductor
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00Communication cables or conductors
    • H01B11/18Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1895Particular features or applications
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Communication Cables (AREA)

Abstract

본 발명은 동축케이블에 관한 것이다. 본 발명에 따른 동축케이블은, 내부도체; 상기 내부도체를 둘러 감싸고 있는 층간접착층; 상기 층간접착층에 면하면서 상기 내부도체의 길이 방향으로 진행하며 나선형으로 감겨지되, 유전율이 2 보다 작은 저유전물질로 제조된 중공관; 상기 중공관 및 상기 중공관에 의해 노출된 층간접착층을 둘러 감싸는 중간절연층; 상기 중간절연층을 둘러 감싸는 외부도체; 및 상기 외부도체를 둘러 감싸고 있는 외부피복층;을 포함하여 이루어진 것을 특징으로 한다. 본 발명에 따르면, 내부도체를 감싸고 있는 중간절연층에 의해 확보된 공기층은 물론 중공관의 배치를 통해 종래에 비해 다량의 공기층이 확보됨으로 인해, 유전율을 현저하게 낮춤으로써 동축케이블의 전파 속도를 향상시킬 수 있다.The present invention relates to a coaxial cable. Coaxial cable according to the present invention, the inner conductor; An interlayer adhesive layer surrounding the inner conductor; A hollow tube made of a low dielectric material having a dielectric constant of less than 2 while being wound in a spiral while advancing in the longitudinal direction of the inner conductor while facing the interlayer adhesive layer; An intermediate insulating layer surrounding the hollow tube and the interlayer adhesive layer exposed by the hollow tube; An outer conductor surrounding the intermediate insulating layer; And an outer coating layer surrounding the outer conductor. According to the present invention, since the air layer secured by the intermediate insulation layer surrounding the inner conductor as well as a large amount of air layers are secured by the arrangement of the hollow tube, the propagation speed of the coaxial cable is improved by significantly lowering the dielectric constant. You can.

동축케이블, 유전율, 중공관, 주름동관, 발포, 전파속도 Coaxial cable, permittivity, hollow tube, corrugated copper tube, foaming, propagation speed

Description

동축케이블{Coaxial cable}Coaxial Cable

본 명세서에 첨부되는 다음의 도면들은 본 발명의 바람직한 실시예를 예시하는 것이며, 후술하는 발명의 상세한 설명과 함께 본 발명의 기술사상을 더욱 이해시키는 역할을 하는 것이므로, 본 발명은 그러한 도면에 기재된 사항에만 한정되어 해석되어서는 아니 된다.The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

도 1은 본 발명에 따른 동축케이블의 횡단면도이다.1 is a cross-sectional view of a coaxial cable according to the present invention.

<도면의 주요부에 대한 설명><Description of main parts of drawing>

10...동축케이블 101...내부도체 102...층간접착층10 Coaxial cable 101 Inner conductor 102 Interlayer adhesive layer

103...중공관 104...외부도체 105...중간절연층103 Hollow pipe 104 Outer conductor 105 Intermediate insulation layer

106...외부피복층106.Outer coating layer

본 발명은 동축케이블에 관한 것으로서, 더욱 상세하게는 내부도체를 둘러 감싸는 중공관을 배치하여 보다 많은 공기층을 확보함으로써 내부도체와 외부도체간 물질의 유전율을 낮추어 동축케이블의 전파 속도를 현저하게 향상시킬 수 있는 동축케이블에 관한 것이다.The present invention relates to a coaxial cable, and more particularly, by arranging a hollow tube surrounding the inner conductor to secure more air layers, thereby lowering the dielectric constant of the material between the inner conductor and the outer conductor to significantly improve the propagation speed of the coaxial cable. The present invention relates to a coaxial cable.

최근 고도 정보화 사회의 진전에 따라, 정보통신기기 및 그 기기에 적용되는 반도체 소자의 시험 및 검사 장치 등의 전송 속도의 고속화에 대한 요청이 높아지고 있다. 그런데, 동축케이블의 전송 특성은 절연체의 비유전율, 내부도체, 절연체의 외경에 관여하고, 비유전율이 작을수록 전송 특성이 향상되고, 내부도체 및 절연체의 외경과도 밀접한 관련이 있는 것으로 알려져 있다. 특히, 절연체는 동축케이블의 전파속도에 영향을 미치는 가장 중요한 요소 중의 하나이며, 발포 절연체의 비유전율은 발포 절연체의 발포배율과 반비례하는 인자로 알려져 있다.In recent years, with the progress of the highly information society, there is a high demand for speeding up the transmission speed of information communication devices and test and inspection devices for semiconductor devices applied to the devices. By the way, the transmission characteristics of the coaxial cable are related to the relative dielectric constant of the insulator, the inner conductor and the outer diameter of the insulator, and the smaller the dielectric constant is, the better the transmission characteristic is, and it is known to be closely related to the outer diameter of the inner conductor and the insulator. In particular, the insulator is one of the most important factors affecting the propagation speed of the coaxial cable, the relative dielectric constant of the foam insulator is known to be inversely proportional to the foaming ratio of the foam insulator.

따라서, 종래의 동축케이블에 있어서, 그 전파속도를 향상시키기 위해서 내부에 이용된 중간절연층을 발포체로 제조하되, 그 발포배율을 높임으로써 포함된 기공밀도를 높여 유전율을 낮게 하는 방법이 제안되고 있다. 특히, 미국 특허 제6,912,777호 및 일본특허 2000-132446에 따르면, 내부도체, 층간접착층, 중간절연층, 외부도체, 외부피복층의 일반적인 구조를 가지고 있으며, 동축케이블에서의 전파 속도 향상을 위한 목적으로 발포 절연층의 발포배율을 높임으로써, 발포체의 공기비율을 높게 하는 방향으로 제시되고 있으나, 발포 방법에 의해 발포체 내의 공기비율 향상에는 기술적 한계가 존재하고 있으며, 고배율 발포를 위해서는 별도의 장치가 필요하며, 고배율 발포가 이루어지더라도 중간절연층의 강도가 저하되어 동축케이블 전체의 강도 저하를 유발할 수 있는 문제점이 지적되고 있다.Therefore, in the conventional coaxial cable, a method of manufacturing an intermediate insulation layer used therein in order to improve its propagation speed by using a foam, but increasing the porosity of the contained pores by increasing the expansion ratio thereof, has been proposed to lower the dielectric constant. . In particular, according to US Pat. No. 6,912,777 and Japanese Patent 2000-132446, it has a general structure of an inner conductor, an interlayer adhesive layer, an intermediate insulation layer, an outer conductor, and an outer sheath layer, and is foamed for the purpose of improving the propagation speed in a coaxial cable. In order to increase the air ratio of the foam by increasing the expansion ratio of the insulating layer, there is a technical limitation in improving the air ratio in the foam by the foaming method, a separate device is required for high magnification foaming, Even if high magnification foaming occurs, the strength of the intermediate insulating layer is lowered, which causes a problem that the strength of the entire coaxial cable is pointed out.

전술한 바와 같이, 발포 절연체의 발포배율을 향상이 갖는 문제점을 인지하고, 종래에 알려져 기술로서 발포된 발포체를 중간절연층에 사용하되, 내부도체와 외부도체 간의 물질층에서의 유전율을 낮추기 위한 여러 노력이 관련 분야에서는 꾸준하게 진행되어 왔으며, 이러한 기술적 배경하에서 본 발명이 안출된 것이다.As described above, recognizing the problem of improving the foaming ratio of the foamed insulator and using foams foamed as a conventionally known technique for the intermediate insulating layer, various methods for lowering the dielectric constant in the material layer between the inner and outer conductors. Efforts have been made steadily in the related field, and the present invention has been devised under this technical background.

전술한 종래의 문제점에 기초하여 본 발명이 이루고자 하는 기술적 과제는, 발포배율을 높이는 종래의 방법이 갖는 장점에 반하여 부가적으로 발생되는 고비용 장비 등의 설치에 따른 경제적인 불리함, 제품 강도의 저하 등의 문제를 최소화하고, 내부도체와 외부도체 간의 물질층에서의 유전율을 낮추고자 하는 것에 있으며, 이러한 기술적 과제를 달성할 수 있는 동축케이블을 제공함에 본 발명의 목적이 있다.The technical problem to be achieved by the present invention based on the above-mentioned conventional problems, economic disadvantages due to the installation of expensive equipment, such as additionally generated, contrary to the advantages of the conventional method of increasing the foaming ratio, lowering the product strength The purpose of the present invention is to minimize the problems such as to lower the dielectric constant in the material layer between the inner conductor and the outer conductor, and to provide a coaxial cable capable of achieving such a technical problem.

본 발명이 이루고자 하는 기술적 과제의 달성을 위해 본 발명에서 제공되는 동축케이블은, 내부도체; 상기 내부도체를 둘러 감싸고 있는 층간접착층; 상기 층간접착층에 면하면서 상기 내부도체의 길이 방향으로 진행하며 나선형으로 감겨지되, 유전율이 2 보다 작은 저유전물질로 제조된 중공관; 상기 중공관 및 상기 중공관에 의해 노출된 층간접착층을 둘러 감싸는 중간절연층; 상기 중간절연층을 둘러 감싸는 외부도체; 및 상기 외부도체를 둘러 감싸고 있는 외부피복층;을 포함하여 이루어진 것을 특징으로 한다.The coaxial cable provided in the present invention for achieving the technical problem to be achieved by the present invention, the inner conductor; An interlayer adhesive layer surrounding the inner conductor; A hollow tube made of a low dielectric material having a dielectric constant of less than 2 while being wound in a spiral while advancing in the longitudinal direction of the inner conductor while facing the interlayer adhesive layer; An intermediate insulating layer surrounding the hollow tube and the interlayer adhesive layer exposed by the hollow tube; An outer conductor surrounding the intermediate insulating layer; And an outer coating layer surrounding the outer conductor.

상기 중공관은, 그 유전율이 2보다 작은 저유전물질로 제조되면 바람직하며, 이러한 조건을 만족하는 폴리에틸렌계수지 및 플루오르에틸렌프로필렌(FEP, Fluorinated Ethylene Propylene)으로 이루어진 물질군 중 선택된 어느 하나의 물질을 이용하면 더욱 바람직하다.The hollow tube is preferably made of a low dielectric material having a dielectric constant of less than 2, and the material of any one selected from the group consisting of polyethylene resins and fluoroethylene propylene (FEP) satisfying these conditions. It is more preferable to use.

상기 내부도체 및 외부도체는, 그 외표면에 주름이 형성된 주름형 동관 또는 원통형 동관이면 바람직하다. 상기 층간접착층은, 폴리에틸렌계 수지를 주성분으로 하는 접착제로 제조되면 바람직하다. 상기 중간절연층은, 발포율이 70% 이상인 발포체로 제조되면 바람직하며, 상기 발포체는, 저밀도폴리에틸렌수지(LDPE)와 고밀도폴리에틸렌수지(HDPE)를 블랜딩한 혼합수지를 발포시켜 제조되면 바람직하다. 상기 외부피복층에 제조에 이용된 폴리에틸렌계수지는, 일반 폴리에틸렌계수지 또는 내화 및 비할로겐성 폴리에틸렌계수지이면 바람직하다.The inner conductor and the outer conductor are preferably corrugated copper tubes or cylindrical copper tubes having wrinkles formed on their outer surfaces. It is preferable that the interlayer adhesive layer is made of an adhesive mainly containing polyethylene resin. The intermediate insulating layer is preferably made of a foam having a foaming ratio of 70% or more, and the foam is preferably prepared by foaming a mixed resin obtained by blending a low density polyethylene resin (LDPE) and a high density polyethylene resin (HDPE). The polyethylene resin used for the production of the outer coating layer is preferably a general polyethylene resin or a refractory and non-halogenated polyethylene resin.

이하, 본 발명에 대한 이해를 돕기 위해 첨부도면과 구체적인 실시예를 들어 더욱 상세하게 설명하기로 한다. 그러나, 본 발명에 따른 실시예들은 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 아래에서 상술하는 실시예들에 한정되는 것으로 해석되지 않아야 한다. 본 발명의 실시예들은 당 업계에서 평균적인 지식을 가진 자에게 본 발명을 보다 완전하게 설명하기 위해서 제공되는 것이다.Hereinafter, with reference to the accompanying drawings and specific embodiments to help understand the present invention will be described in more detail. However, embodiments according to the present invention can be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

도 1은 본 발명에 따른 동축케이블(10)의 횡단면도이다.1 is a cross-sectional view of a coaxial cable 10 according to the present invention.

도 1을 참조하면, 동관으로 이루어진 내부도체(101)와, 이를 감싸고 있는 박층의 층간접착층(102)에 면하여 중공관(103)이 내부도체(101)의 길이방향으로 진행하면서 나선형으로 감싸고 있으며, 중공관(103)에 의해 노출된 층간접착층(102) 상면 및 중공관(103) 전부를 감싸도록 중간절연층(105)이 피복되어 있으며, 중간절연층(105)을 둘러 감싸고 있는 외부도체(104) 및 외부피복층(106)이 순차로 적층된 구조를 갖는 동축케이블(10)을 확인할 수 있다.Referring to Figure 1, the inner conductor 101 made of a copper tube, and the thin layer interlayer adhesive layer 102 surrounding the hollow tube 103 is spirally wrapped while proceeding in the longitudinal direction of the inner conductor 101 The outer insulating layer 105 is coated to cover the upper surface of the interlayer adhesive layer 102 and the hollow tube 103 exposed by the hollow tube 103, and surrounds the intermediate insulating layer 105. The coaxial cable 10 having a structure in which the 104 and the outer coating layer 106 are sequentially stacked can be confirmed.

내부도체(101)는 도시된 바와 같이 그 외표면에 주름이 형성된 주름형 동관 이나 주름이 없는 원통형의 동관형태로 제조될 수 있다. 층간접착층(102)은 내부도 체(101)에 중공관(103)이나 중간절연층(105)을 직접 접촉시켜 접착시키는 경우에는 그 접착력이 충분하게 확보되지 못하므로, 먼저 박층의 폴리에틸렌 수지로 이루어진 접착체를 먼저 피복시킨 것이다. 중공관(103)은 내부가 비어있는 관의 형태로서, 내부도체(101)을 감싸고 있는 중간절연층(105) 영역에 유전율이 낮은 공기층을 최대한 확보하기 위한 목적에서 채택되고 있다. 중공관(103)은 내부도체(101)를 나선형으로 둘러 감싸면서 구비되며, 중공관(103)을 이루는 소재도 유전율이 낮아야 동축케이블의 전파 속도를 향상시킬 수 있으므로, 저유전율의 고분자물질을 사용하면 바람직하다. 따라서, 중공관(103)은 유전율이 2보다 작은 저유전물질로 제조되면 바람직하다. 이를 위해서는 폴리에틸렌계수지, 플루오르에틸렌프로필렌(FEP, Fluorinated Ethylene Propylene) 등이 저유전물질이 이용되면 바람직하며, 이들 저유전물질의 밀도는 0.92 내지 0.98g/㎤이면 바람직하다. 중공관(103) 제조에 이용되는 재료의 유전율에 대한 수치범위와 관련하여, 상한치보다 큰 유전율을 갖는 재료를 이용하여 중공관(103)을 제조하면 동축케이블의 전파 속도 향상에 저해하게 되어 바람직하지 못하다.As shown, the inner conductor 101 may be manufactured in the form of a corrugated copper tube having a wrinkle on its outer surface or a cylindrical copper tube without wrinkles. When the interlayer adhesive layer 102 directly adheres to the inner conductor 101 by contacting the hollow tube 103 or the intermediate insulating layer 105, the adhesive force is not sufficiently secured. Therefore, the interlayer adhesive layer 102 is made of a thin polyethylene resin. The adhesive was first coated. The hollow tube 103 is a hollow tube, and has been adopted for the purpose of maximally securing an air layer having a low dielectric constant in the region of the intermediate insulating layer 105 surrounding the inner conductor 101. The hollow tube 103 is provided while enclosing the inner conductor 101 in a spiral shape, and the material forming the hollow tube 103 also has a low dielectric constant to improve the propagation speed of the coaxial cable, so that a polymer having a low dielectric constant is used. Is preferable. Therefore, the hollow tube 103 is preferably made of a low dielectric material having a dielectric constant of less than two. For this purpose, a low dielectric material is preferably used for polyethylene resin, fluoroethylene propylene (FEP, Fluorinated Ethylene Propylene), and the density of these low dielectric materials is preferably 0.92 to 0.98 g / cm 3. Regarding the numerical range for the dielectric constant of the material used to manufacture the hollow tube 103, the manufacture of the hollow tube 103 using a material having a dielectric constant greater than the upper limit inhibits the propagation speed of the coaxial cable, which is undesirable. Can not do it.

도 1에서 표기된, D0는 동축케이블(10) 전체의 직경을 나타내고, D는 중공관(103)의 직경을 나타내고, H는 중공관(103)의 두께를 나타내고 있다. 도 1에 도시된 동축케이블(10)에서는 D0는 420㎜이고, D는 10㎜이고, H는 3㎜가 되도록 하였다. 중공관(103)에서 D가 커지고, H가 작을수록 보다 많은 공기층이 형성될 수 있으므로, 보다 향상된 전파 속도가 확보될 수 있는 동축케이블 제조가 가능해진다.1, D 0 represents the diameter of the entire coaxial cable 10, D represents the diameter of the hollow tube 103, and H represents the thickness of the hollow tube 103. In the coaxial cable 10 shown in FIG. 1, D 0 is 420 mm, D is 10 mm, and H is 3 mm. As D increases in the hollow tube 103 and H decreases, more air layers can be formed, and thus, a coaxial cable can be manufactured in which an improved propagation speed can be ensured.

중간절연층(105)은, 저밀도폴리에틸렌수지(LDPE)와 고밀도폴리에틸렌수지(HDPE)를 블랜딩된 발포용 혼합수지를 발포시켜 얻은 절연체로서, 발포배율이 70% 이상, 즉 발포체 내에 포함된 공기 비율이 70% 이상 되도록 발포시킨 절연체가 사용되었다. 상기 중간절연층(105)으로 이용되는 발포체의 발포배율에 대한 수치범위에 있어서, 그 하한치에 미달하면, 발포체 내부에 형성되는 기공층이 충분하게 확보되지 못하고, 이로 인하여 동축케이블의 전파 속도 향상에 기여하지 못하고 오히려 전파 속도를 저감시키는 요인으로 작용하여 바람직하지 못하다.The intermediate insulating layer 105 is an insulator obtained by foaming a mixed resin for foaming blended low density polyethylene resin (LDPE) and high density polyethylene resin (HDPE), and the expansion ratio is 70% or more, that is, the proportion of air contained in the foam Insulators foamed to 70% or more were used. In the numerical range of the foaming ratio of the foam used as the intermediate insulation layer 105, if it falls below the lower limit, the pore layer formed inside the foam is not sufficiently secured, thereby improving the propagation speed of the coaxial cable. It is not preferable because it does not contribute but rather acts as a factor for reducing the propagation speed.

이러한 밀도 조건에 부합되는 저밀도폴리에틸렌수지(LDPE)와 고밀도폴리에틸렌수지(HDPE)를 블랜딩하여 얻은 혼합수지의 밀도는 0.92 내지 0.95g/㎤가 되도록 블랜딩하였다. 이와 같이, 중간절연층(105)으로 이용하기 위해 제조된 발포 절연체의 밀도는 0.21 내지 0.24g/㎤이었다. 외부도체(104)는 전술한 발포 절연체로 이루어진 중간절연층(105)으로 감싸여지며 그 외표면은 주름이 형성된 주름형 동관이 도시되어 있으나, 원통형 동관이 사용될 수도 있다. 한편, 주름형 동관이 사용되는 경우에는 동관에 형성된 주름의 비율에 따라 동축케이블이 회전 가능한 반경 및 반복 굽힘의 횟수를 제한될 수 있다. 외부피복층(106)은 폴리에틸렌계 수지, 구체적으로 일반 폴리에틸렌계 수지 또는 내화성 비할로겐성 폴리에틸렌계 수지를 이용하여 제조하면 바람직하다.The density of the mixed resin obtained by blending low density polyethylene resin (LDPE) and high density polyethylene resin (HDPE) meeting these density conditions was blended so as to be 0.92 to 0.95 g / cm 3. In this way, the density of the foamed insulator manufactured for use as the intermediate insulating layer 105 was 0.21 to 0.24 g / cm 3. The outer conductor 104 is surrounded by the intermediate insulation layer 105 made of the above-described foamed insulator, and the outer surface of the outer conductor 104 has a corrugated copper tube formed with corrugations, but a cylindrical copper tube may be used. On the other hand, when the corrugated copper tube is used, the radius of the coaxial cable can be rotated and the number of repeated bendings can be limited according to the ratio of the corrugation formed in the copper tube. The outer coating layer 106 is preferably manufactured using a polyethylene-based resin, specifically, a general polyethylene-based resin or a fire-resistant non-halogenated polyethylene-based resin.

본 발명에 따른 동축케이블은, 인출기, 켑스턴, 접착층 압출기, 중간절연층 압출기, 멜트펌프, 냉각라인, 주름라인, 외부피복층 압출기, 권취기 등의 여러 장치를 연속적으로 경유하면서 제조된다.The coaxial cable according to the present invention is manufactured while continuously passing through various apparatuses such as an extractor, a shexton, an adhesive layer extruder, an intermediate insulation layer extruder, a melt pump, a cooling line, a corrugation line, an outer coating layer extruder, and a winding machine.

인출기는 전선 가공에 필요한 선재나, 전 공정 처리한 재료를 공급하는 역할을 하며, 압출기와 권취기 등과 연동되어 인출 속도가 제어되거나, 독립적으로 회전 속도가 제어될 수 있으며, 인출기를 이용하여 동축케이블의 심재를 구성하는 내부도체인 동관이 공급된다. 켑스턴은 내부도체인 동관의 공급이 중단될 경우, 압출을 정지하고 공정이 멈추지 않도록 여분의 내부도체를 유지시키는 장치이다. 내부도체인 동관 외표면 상에 일정한 두께를 갖는 폴리에틸렌계열의 수지 절연체를 직접 압출하여 중간절연층을 제조하게 되면, 긴밀한 접착이 이루어지지 않게 되는 문제점이 있으므로, 내부도체인 동관의 외표면에 폴리에틸렌을 박층으로 미리 압출하여 내부도체와 중간절연층간의 접착력을 향상시키는 과정을 진행한다. 이러한 박층의 폴리에틸렌 접착층을 미리 형성함으로써, 중간절연층과 내부도체간의 긴밀한 접착이 이루어지며, 중간절연층의 발포 압출의 토출량과 내부도체인 동관 선재의 제어가 가능해질 수 있다. 중간절연층 압출기는 발포압출기로서, 저밀도폴리에틸렌(LDPE)과 고밀도폴리에틸렌(HDPE)이 블랜딩된 발포용 수지에 대해 요구되는 발포배율로 발포시키는 장치이다. 중간절연층 압출기로부터 일정량씩 토출시키면서 압출이 이루어질 수 있도록 제어하기 위해 멜트 펌프가 구비되어 있으며, 토출된 압출물 절연체는 멜트 펌프를 지나 압출기의 다이로 이송된다. 이후 발포된 압출물 절연체를 냉각시키기 위한 냉각라인과 냉각된 중간절연층 상에 외부도체인 동을 이용한 주름관을 입히는 주름라인을 각각 경유하며, 마지막으로 외부도체인 주름 동관 외표면에 폴리에틸렌계 수지를 이용한 피복층을 형성시킴으로써 동축케이블 제조가 완료된다. 이후, 제품의 보관이나 운송 등을 용이하게 하기 위해 권취기를 이용하 여 보빈 등에 감는 작업을 진행한다.The drawer serves to supply wire rod or pre-processed material required for wire processing, and the drawing speed can be controlled in conjunction with the extruder and the winding machine, or the rotational speed can be controlled independently. Copper tubes, the inner conductor of the core, are supplied. Shexton is a device that stops extrusion and maintains an extra inner conductor when supply of copper tube, which is an inner conductor, is stopped. When the intermediate insulation layer is manufactured by directly extruding a polyethylene-based resin insulator having a certain thickness on the inner surface of the copper tube, which is an inner conductor, there is a problem that close adhesion cannot be made. Therefore, polyethylene is applied to the outer surface of the inner tube of the copper tube. Extruded into a thin layer in advance to improve the adhesion between the inner conductor and the intermediate insulating layer. By forming such a thin polyethylene adhesive layer in advance, a close adhesion between the intermediate insulating layer and the inner conductor is achieved, it is possible to control the discharge amount of the foam extrusion of the intermediate insulating layer and the copper tube wire which is the inner conductor. The intermediate insulation extruder is a foam extrusion extruder, and is a device for foaming at the foaming ratio required for the foaming resin blended with low density polyethylene (LDPE) and high density polyethylene (HDPE). A melt pump is provided to control extrusion by discharging a predetermined amount from the intermediate insulating layer extruder, and the discharged extrudate insulator is transferred to the die of the extruder through the melt pump. Then, through the cooling line for cooling the foamed extrudate insulator and the corrugation line which coats the corrugated pipe using copper as the outer conductor on the cooled intermediate insulation layer, and finally, polyethylene resin is applied to the outer surface of the corrugated copper tube as the outer conductor. Coaxial cable manufacture is completed by forming the coating layer used. Afterwards, to wind the bobbin or the like using a winder to facilitate storage or transportation of the product.

전술한 본 발명에 관한 상세한 설명에서 특정한 용어들이 사용되었으나, 이는 단지 당업자에게 본 발명을 상세히 설명하기 위한 목적에서 사용된 것이지 의미 한정이나 특허청구범위에 기재된 본 발명의 범위를 제한하기 위해 사용된 것이 아니다. Although specific terms have been used in the foregoing detailed description of the invention, they are used only for the purpose of describing the invention in detail to those skilled in the art and are used to limit the scope of the invention as defined in the claims or in the claims. no.

본 발명에 따르면, 내부도체를 감싸고 있는 중간절연층에 의해 확보된 공기층은 물론 중공관의 배치를 통해 종래에 비해 다량의 공기층이 확보됨으로 인해, 유전율을 현저하게 낮춤으로써 동축케이블의 전파 속도를 향상시킬 수 있다.According to the present invention, since the air layer secured by the intermediate insulation layer surrounding the inner conductor as well as a large amount of air layers are secured by the arrangement of the hollow tube, the propagation speed of the coaxial cable is improved by significantly lowering the dielectric constant. You can.

Claims (9)

내부도체;Inner conductor; 상기 내부도체를 둘러 감싸고 있는 층간접착층;An interlayer adhesive layer surrounding the inner conductor; 상기 층간접착층에 면하면서 상기 내부도체의 길이 방향으로 진행하며 나선형으로 감겨지되, 유전율이 2 보다 작은 저유전물질로 제조된 중공관;A hollow tube made of a low dielectric material having a dielectric constant of less than 2 while being wound in a spiral while advancing in the longitudinal direction of the inner conductor while facing the interlayer adhesive layer; 상기 중공관 및 상기 중공관에 의해 노출된 층간접착층을 둘러 감싸는 중간절연층;An intermediate insulating layer surrounding the hollow tube and the interlayer adhesive layer exposed by the hollow tube; 상기 중간절연층을 둘러 감싸는 외부도체; 및An outer conductor surrounding the intermediate insulating layer; And 상기 외부도체를 둘러 감싸고 있는 외부피복층;을 포함하여 이루어진 것을 특징으로 하는 동축케이블.A coaxial cable comprising a; an outer coating layer surrounding the outer conductor. 삭제delete 제1항에 있어서,The method of claim 1, 상기 저유전율 물질은, 폴리에틸렌계수지 및 플루오르에틸렌프로필렌(FEP, Fluorinated Ethylene Propylene)으로 이루어진 물질군 중 선택된 어느 하나의 물질인 것을 특징으로 하는 동축케이블.The low dielectric constant material is a coaxial cable, characterized in that any one material selected from the group consisting of polyethylene resin and fluoroethylene propylene (FEP, Fluorinated Ethylene Propylene). 제1항에 있어서,The method of claim 1, 상기 내부도체는, 그 외표면에 주름이 형성된 주름형 동관 또는 원통형 동관인 것을 특징으로 하는 동축케이블.The inner conductor is a coaxial cable, characterized in that the corrugated copper tube or cylindrical copper tube formed on the outer surface. 제1항에 있어서,The method of claim 1, 상기 층간접착층은, 폴리에틸렌계 수지를 주성분으로 하는 접착제로 제조된 것을 특징으로 하는 동축케이블.The interlayer adhesive layer is a coaxial cable, characterized in that made of an adhesive containing a polyethylene-based resin as a main component. 제1항에 있어서,The method of claim 1, 상기 중간절연층은, 발포율이 70% 이상인 발포체로 제조된 것을 특징으로 하는 동축케이블.The intermediate insulation layer is a coaxial cable, characterized in that made of foam having a foaming rate of 70% or more. 제6항에 있어서,The method of claim 6, 상기 발포체는, 저밀도폴리에틸렌수지(LDPE)와 고밀도폴리에틸렌수지(HDPE)를 블랜딩한 혼합수지를 발포시켜 제조된 것을 특징으로 하는 동축케이블.The foam is a coaxial cable, characterized in that the foam produced by blending a low density polyethylene resin (LDPE) and a high density polyethylene resin (HDPE) blended. 제1항에 있어서,The method of claim 1, 상기 외부도체는, 그 외표면에 주름이 형성된 주름형 동관 또는 원통형 동관인 것을 특징으로 하는 동축케이블.The outer conductor is a coaxial cable, characterized in that the corrugated copper tube or cylindrical copper tube formed on the outer surface. 제1항에 있어서,The method of claim 1, 상기 외부피복층에 제조에 이용된 폴리에틸렌계수지는, 일반 폴리에틸렌계수지 또는 내화 및 비할로겐성 폴리에틸렌계수지인 것을 특징으로 하는 동축케이블.Polyethylene resin used in the manufacture of the outer coating layer is a coaxial cable, characterized in that the general polyethylene resin or fire-resistant and non-halogen-resistant polyethylene resin.
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US20170069409A1 (en) * 2015-09-03 2017-03-09 Commscope Technologies Llc Coaxial cable with outer conductor adhered to dielectric layer and/or jacket
WO2017062171A1 (en) * 2015-10-06 2017-04-13 Commscope Technologies Llc Coaxial cable with dielectric layer having sealed segments and method of making same

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JPH07249322A (en) * 1994-03-09 1995-09-26 Ocean Cable Co Ltd Highly foamed coaxial cable
JPH08329744A (en) * 1995-05-30 1996-12-13 Furukawa Electric Co Ltd:The Coaxial cable and its manufacture
JP2003217363A (en) * 2002-01-18 2003-07-31 Ube Nitto Kasei Co Ltd Small diameter coaxial cable and its manufacturing method

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JPH07249322A (en) * 1994-03-09 1995-09-26 Ocean Cable Co Ltd Highly foamed coaxial cable
JPH08329744A (en) * 1995-05-30 1996-12-13 Furukawa Electric Co Ltd:The Coaxial cable and its manufacture
JP2003217363A (en) * 2002-01-18 2003-07-31 Ube Nitto Kasei Co Ltd Small diameter coaxial cable and its manufacturing method

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