Checklist circular knife

1. Check stability of the knife holder

2. Check concentricity, max. 0,03 mm (axial concentricity should be max. 0,01 mm)

3. Check the cutting point – the anvil should lift the paper web max. 1,0 mm

4. Check cant angle, if necessary, service the knife holder

5. overlap max. 1,0 mm

6. Check overspeed – optimally the upper knife is 0,5 m/s faster than the paper web

7. Surface quality of the knife should be at least Ra 0,4 µm

8. Check lateral contact pressure, it should be kept to a minimum

9. Optimal cutting angle on the bottom knife is 1-3°