Crush cutting vs. shear slitting?

Crush cutting is an upper knife under pressure against a material web with a hardened anvil roll below it. The material is actually crushed and split apart. Set up changes are quicker than shear slitting and can be accomplished with the material web remaining in place. The main disadvantage is that blade life is shorter due to metal-to-metal contact. Blade life is always a consideration for any given application. Also ,the final cut is usually rougher than shear slitting and leaves a residue.

Shear slitting is the use of two sharp knives one against the other with material passing between (like a pair of scissors). An upper and lower knife makes a shear slitting assembly. The upper knife may be attached to a pneumatic or manual cylinder, which moves the knife into or away from the material passing over the lower knife.

The lower knife is usually mounted on a driven shaft locked...