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    • 21. 发明专利
    • FORMATION OF FOAMING FLUORORESIN INSULATED COATING
    • JPH0197328A
    • 1989-04-14
    • JP25502487
    • 1987-10-09
    • HITACHI CABLE
    • ANDO YOSHIYUKISHIMIZU MASAZUMISEKI IKUOYAGYU HIDEKIENDO KATSUOKURODA SANEHIROHORII KOJI
    • H01B13/14
    • PURPOSE:To disperse a foaming agent over the fused fluororesin uniformly and cover it by using fluorocarbon containing more than three fluorine atoms as the foaming agent at the time of forming a foaming fluororesin insulated coating applicable to an insulated wire or a coaxial cable or the like, and injecting this fluorocarbon in the midway of an extruder at more than the specified pressure. CONSTITUTION:Thermal-fusion extrudable fluororesin and a foaming agent are led into an extruder, while this foaming agent is uniformly dispersed in the fused fluororesin, and it is extruded to the outer periphery of a conductor for its covering, forming a foaming fluororesin insulated coating in this way. At the time of forming this fluororesin insulated coating, fluorocarbon containing more than three fluorine atoms is used as a foaming agent, and this fluorocarbon is injected in the point midway in the extruder, and the injection pressure should be more than 10kg/cm . After the foaming agent is uniformly dispersed in the fused fluororesin, it is extruded to the conductor outer periphery at the specified outer diameter for its covering, thereby forming the foaming insulated coating at a specified thickness.