Slotter knives are one of the necessary blades in the packaging and corrugated paper industry. They include the upper and lower knives. The common upper knives include arc knives and curved serrated knives; the quality of the blade is gradually reduced as the cutting edge of the blade is worn, and cracks may be generated when the burrs are generated.

The following is the upper part of slotter knife, its service life directly affects the quality of the box slot and manufacturing costs.