30 advance | 3-2012 T o improve the stability of the surface quality and provide favorable proces- sing characteristics, steel and iron plates receive an oil coating. The oil pro- tects against corrosion and also serves as a lubricant in rolling and punching proces- ses. Usually, an electrostatic ? eld is used for the oil application in order to create a gap-free oil curtain. The thickness and evenness of the oil application are deter- mine

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