1. Step #WT-1 , we have to cut off this defect at the right side of shaft machine.
And after that, we will rotate roll and bring it back to shaft machine again.
(Because of the limitations of the machine. We cannot cut off defect
at the left of shaft machine and cut the roll(product) continuously.)
2. If we don't have this process (Step #WT-1 to WT-4).
The product will look in the image and our customer can't accept.