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FLEXO Magazine : June 2013
Formulating steel to meet the needs oF hd Flexo metering... 1. Chemistry: Doctor blade steels are ferrous or Iron based with some amount of Carbon plus other ingredients like Manganese, Molybdenum, Silicon, Chromium, Nickel, and so on. The ingredients and the amount of each included in a melt determines key performance char- acteristics, such as hardness and wear resistance, as well as the corrosion resistance each type of steel will have. These ingredients make up the chemical compo- sition of each type or grade of steel. 2. Treatments: Following the melt in which the ingredients are joined together, treatments such as hot rolling, cold roll- ing and tempering determine the quantity, size and distribution of carbides and other ingredients forming the steel’s micro-structure. The sequence, magnitude and duration of each treatment have as much to do with steel’s performance as a doctor blade, as does its chemistry. When treatments vary, steels with the same chemistry will perform differently. 3. Finishing: Precise straightness, flatness and edge finish- ing determine if the blade will sit flat in the hold- er’s clamp, if the blade will make simultaneous anilox contact or meter consistently from start to stop. 66 Flexo June 2013 www.flexography.org