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Newsletter Topic: Cant or Shear Angle

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The cant angle or shear angle as it is sometimes referred to is the angle the top slitter or male slitter makes when engaged against the bottom slitter band or the female slitter. The point of contact between the two slitters should be one point. If the two blades are in constant contact the wear on the top slitter will be excessive and require early removal. Ideal cant angle for most grades of paper is 0.5 degrees. You can check the cant angle with a feeler gauge. You can also pass a small piece of paper through the nip of the two blades in the direction of the paper travel and the paper should slit evenly and without problem. Pass another small piece of paper in the opposite direction and the paper should not slit but fold over at the nip point of the two blades. If the paper slits in both directions then there is no cant angle.

The cant angle in most slitting equipment is built in to a fixed position or can be adjusted to several positions. One can loose the cant angle even though it is set correctly by loose fitting or worn bearing hubs, shafts, spacers, etc. Usually when the cant is too high the blades sing or make a high pitched sound. Incorrect cant angles cause premature wear, rough cuts, dusting and even sheet breaks if they are severe enough.

One can evaluate several cant angles to see which is best suited to equipment, conditions, and paper. Cants can vary from 0.25 degrees to 1.5 degrees or even higher. The cant angle once determined for each specific application should not be changed. Changing cant angles for different types or weights of paper will usually cause more problems than benefits. Seek the assistance of trained personnel to determine the best conditions for your operations and instruct your operators to check the cant angle every time they change blades.

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