Shear angle

All slitting positions need a positive shear angle. Using a large scrap of paper, run the paper thru the cut point in the forward and reverse directions. The forward direction should provide a better cut quality.

Shear (cant) angle is the angular relationship between the lower band and the upper blade. The best shear angle for a specific product is the minimum angle required to reliably slit the web. The steeper the shear angle, the faster the blade will wear. The shear angle can be measured by inserting a feeler gauge between the top blade and bottom band behind the cut point. The greater the chord (a straight line joining two points on a curve), the larger the measured gap will be.