Slitting burrs are usually caused by the following, to be checked in order of priority:

1) Tool clearance: generally 5-8% of strip thickness; excessive clearance causes tearing rather than shearing, producing pronounced burrs. 2) Tool wear and arbor accuracy: worn cutting edges and misalignment of upper and lower arbors both produce uneven burrs. 3) Tension: insufficient tension causes strip tracking deviation and unstable shearing. 4) Incoming strip edge quality: edge cracks from hot or cold rolling are amplified after slitting.

Recommended adjustment sequence: first measure clearance → then check arbor runout → then adjust tension → finally evaluate the incoming material.