Transforming Art into Science

The need for speed

Overspeed is referenced when comparing the web speed to the nip speed. The desire is to have the slitter nip speed moving faster than the web speed. It is similar to using scissors to cut wrapping paper. If the scissors are allowed to cut the wrapping paper without closing (acting like a razor cut), the result is an under-sped nip, and the scissors are likely to snag at some point. When the scissors are closed to cut the paper, the nip is moving faster than the wrapping paper and is then an over-sped nip. In shear slitting, the desire is to have the nip speed moving faster than the web speed.