Slitter blades will rub with boards during operation, resulting in blade blunding. Therefore, it is neccessary to shapen blades with grinding wheels. lcknife Slitter blades made of different materials should be sharpened with correspondinggrinding wheels. For example, you can choose CBN(cubic boron nitride) grinding wheel for high-speed steel thin blade, with particle size ranging from 100#-150#; While tungsten steel thin blades should be sharpen with SCD(diamond) grinding wheels, with particle size ranging from 180#-240#.