The effects of the roll intermesh on the straightness limit and the effect of the original conditions of bar on the straightness limit by roller leveler straightening were investigated and discussed. When a straight (one-dimentional) bar or a curved (two-dimentional) bar was fed into roller leveler straightening, excellent straightness was achieved. However, there was a straightness limit using a bar in coil. The main factor in the generation of the straightness limit in the bar in coil was the three-dimensional twisting present in the bar in coil before straightening. When the No. 2 roll intermesh was large, the straightness limit decreased. There was no rotation of the straight (one-dimentional) bar or the curved (two-dimentional) bar during straightening. However, there was rotation of the bar in coil and the curved and twisted (three-dimentional) bar during straightening.
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