Noncircular grinding of backup rolls to reduce .
168 Proc. Estonian Acad. Sci. Eng., 2007, 13, 2, 168–179 Noncircular grinding of backup rolls to reduce rolling force variation Thomas Widmaiera, Jari Uusimäkib, Petri Kuosmanena, Jari Juhankoa and Pekka Väänänenc a