Neutral position between corrugating roll and pressure roll from which the corrugated fiberboard cross sectional geometry and the interference between medium and facing material are determined in terms of the corrugating roll diameter 2R_cr, pressure roll diameter 2R_pr, flute tip radius r, corrugating roll pitch P_cr, and the measured flute height D_f. The core-facing profile interference due to rotating the corrugating roll from this position by one half the pitch angle can be reduced or increased by translating the roll centers.