COAXIAL CABLE AND MANUFACTURING METHOD OF THE SAME

• Main Authors: HASEGAWA TOMOKI, NUMATA SHUICHI, ABE MASAHIRO
• Format: Patent
• Language: English; Japanese
• Published: 09.04.2020
• Subjects: ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; CABLES; CONDUCTORS; ELECTRICITY; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES

To provide a technology which can improve heat-resistance performance of a coaxial cable using a resin foam in an insulator.SOLUTION: A leakage coaxial cable includes: an inner conductor; an insulator formed by a foam insulation layer that is arranged on an outer periphery of the inner conductor, formed by a resin which is foamed, and is not cross-linked, and a cross-linked reinforcement layer that is arranged on the outer periphery of the foam insulation layer, is formed by the resin which is not foamed or an elastomer which is not foamed, and is cross-linked; a heat-resistance tape layer arranged on the outer periphery of the cross-linkage reinforcement layer; an outer conductor arranged on the outer periphery of the heat-resistance tape layer, and having a slot; a suppression winding tape layer arranged on the outer periphery of the outer conductor; and a sheath arranged on the outer periphery of the suppression winding tape layer. The leakage coaxial cable has 0.4 MΩ/1.3 m or more of an insulation resistance after a heat-resistance test according to "the reference of heat-resistance electric wire" (December 18, 1997 Fire Service Agency Notification No. 11) based on standards of Fire Protection Law, Enforcement Regulations Article 12-1, Section 5 (Autonomy Ministerial Ordinance No. 6 of 1961).SELECTED DRAWING: Figure 1 【課題】絶縁体に発泡樹脂を用いた同軸ケーブルの耐熱性能向上を図ることができる技術を提供する。【解決手段】内部導体と、前記内部導体の外周上に配置され、発泡した樹脂により形成され、架橋されていない発泡絶縁層と、前記発泡絶縁層の外周上に配置され、発泡していない樹脂または発泡していないエラストマーにより形成され、架橋されている架橋補強層とからなる絶縁体と、前記架橋補強層の外周上に配置された耐熱テープ層と、前記耐熱テープ層の外周上に配置され、スロットを有する外部導体と、前記外部導体の外周上に配置された抑え巻テープ層と、 前記抑え巻テープ層の外周上に配置されたシースと、を有する漏洩同軸ケーブルであって、消防法施行規則（昭和三十六年自治省令第六号）第十二条第一項第五号ロただし書の規定に基づく「耐熱電線の基準」（平成九年十二月十八日 消防庁告示第十一号）に準拠した耐熱試験の後、絶縁抵抗が０．４ＭΩ／１．３ｍ以上である漏洩同軸ケーブル。【選択図】図１