Kapton polymide film manufactured by m/s. E.I dupont of u.S.A is used as insulation over the copper conductor. The film 15 either lapped with 50% to 55% or with 65% to 70% overlap. The type of film used for the manufacture of the conductor consists of 25 micron thick polymide film with 12 microns of adhesive material [fep - fluorocarbon resin] on one side. The adhesive material when heated melts and thus bonds with the copper effectively. The process of induction heating ensures uniform heating of the adhesive material resulting in an insulation that is free from voids. Kapton covered wire has several advantages:
Thickness of insulation is very fine
Dielectric strength is very high
High thermal class [220°c]
Excellent flexibility of heat sealed film, can withstand severe twists and blends
High reliability
Resistant to solvents and retains its properties under varied atmospheric conditions.
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