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    • 6. 发明专利
    • MANUFACTURE OF INDUCTION HEATING COIL
    • JPH03280387A
    • 1991-12-11
    • JP8165690
    • 1990-03-28
    • FUJIKO KK
    • YAMAMOTO ATSUOHORI MASAOSAKAMOTO SHINICHI
    • H05B6/36
    • PURPOSE:To accomplish stable operation with the continuous injection clad forming method and reduce maintenance works by wrapping a coil conductor with an electric insulative material consisting of mica tape pinched between glass cloth tapes, and thereover laying a castable refractory substance as protector. CONSTITUTION:A three-ply tape 2 is formed by pinching a mica tape 22 between glass cloth tapes 21 and wound on the periphery of a coil conductor 1, and further thereover a castable refractory substance 3 of alumina type is laid as covering to achieve an induction heating coil. Mica which ensures electric insulation at a high temp. is not flexible, and it has been difficult to wind it on a coil conductor, but this construction as mentioned imparts flexibility to enable winding spirally on a coil in tight contact therewith. Further the maintenance works can be reduced to a great extend owing to this construction in which the outermost layer is covered with a refractory substance having a low thermal conductivity as well as low coefficient of thermal expansion, equipped with excellent resistance against heat shocks, and having low reactivity with molten glass, slag, etc.