The finished product of longitudinal cutting has traces of knife back on one side and no trace on the other. What happened?

1. Tool problem: the surface of the tool is uneven or worn, resulting in uneven force during cutting. Replace flat and wear-free tools to ensure uniform pressure during cutting.

2. Equipment problems: There may be problems with the slitting machine itself, such as uneven contact area between the cutter and the material, or poor stability during operation. Check whether there is any problem with the slitting machine and adjust it as needed.

3. Operation problem: The operator may not set the height or cutting speed of the tool correctly when cutting materials, resulting in uneven pressure during cutting. Improve operation skills, ensure that the tool height and cutting speed are set correctly when cutting materials, and ensure uniform pressure when cutting.