Construction : Polymide film 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. Polymide film covered wire have 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
- Resistant to solvents and retains its properties under varied atmospheric conditions.
Due to above mentioned advantages; this conductor is used in most critical applications such as winding of Traction Motors.
Rectangular copper conductors covered with polymide film tape. The tape is coaled with suitable adhesive and tapping, the tape is heat sealed to form a continuous and adherent sheathed.
Temperature Index: 220ºC
Dimensions : As specified in the above mentioned o specifications and also conforming to IS: 6160
Standards : Indian standard: IS 11174 and also as per customers’ specifications.