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    • 9. 发明授权
    • Method of forming concentric cable layer and article formed
    • 形成同心电缆层和制品的方法
    • US4454709A
    • 1984-06-19
    • US357358
    • 1982-03-12
    • Ralph E. Wahl
    • Ralph E. Wahl
    • H01B7/38H01B9/02H01B13/26D07B7/14H01B7/34H01B13/22
    • H01B13/268H01B7/38H01B9/027
    • A cable structure having a stranded inner conductor and an insulating layer over the conductor is formed by feeding a tape of semiconducting material onto the wire as it enters an extruder head. The tape is not spirally wound on the conductor but rather is fed longitudinally along with the wire into the extruder head so as to dispose the tape about the wire and beneath the insulation layer extruded thereon. The product formed has a good concentricity and the tape element conforms generally to the stranded wire to provide a minimum thickness of the tape composition to permit the cable to function effectively at medium voltage. The tape employed is preferably a semiconducting tape which can serve to distribute the electrical stresses emanating from the conductor when it is at high voltage. The tape may be formed of a crosslinkable material and the outer insulation may also be crosslinkable. Cable products having crosslinked insulation separated from a stranded conductor by a crosslinked semiconducting layer formed of a ring of crescents may be formed.
    • 当导线进入挤出机头时,通过将半导体材料带馈送到线上而形成具有绞合的内导体和导体上的绝缘层的电缆结构。 胶带不是螺旋缠绕在导体上,而是与丝线一起纵向地供给到挤出机头中,以便将带布置在线周围并在其上挤出的绝缘层下方。 所形成的产品具有良好的同心度,并且带元件通常与绞线相符,以提供带组合物的最小厚度,以允许电缆在中压下有效地起作用。 所使用的带优选是半导体带,其可以用于在导体处于高电压时分布从导体发出的电应力。 带可以由可交联材料形成,并且外部绝缘体也可以是可交联的。 可以形成具有通过由新月形环形成的交联半导体层与绞合导体分离的交联绝缘体的电缆产品。