Did you know that one ton of paper (appr. 2000 lbs) may contain up to 100 litres (appr. 26,5 gallons) of water? Paper is a natural substance which may absorb water and also release it. Quite a number of binderies and bindery departments have experienced that...

When the knife cuts through the material at an angle there ought to be no vertical stripes in the trimmed section, right?
Such striping occurs nevertheless. Vertical striping is caused when the cutting material is incorrectly clamped.