Heating coil for metallic strip, comprises turns which present a concave outline for the coil such that the edges of strip being heated receive lower magnetic field than centre to give even heating

摘要

A metal strip (1) to be heated moves in the direction (F) through turns (7,7') of a heating coil with electrical supply (6) . The turns are shaped to be concave with a smaller length (L1) in the middle of the strip than the length (L2) at the edges of the strip such that the magnetic field at the edges is less than at the middle giving an even heating and temperature throughout the strip