The slotting knives of the automatic dust-free slotting machine consist of an upper and a lower blade. Common upper blades include curved knives and curved-toothed knives; the lower blades feature semi-circular blades with sharp or right angles, or semi-circular slot width rings. The lifespan of the slotting knives in the automatic dust-free slotting machine depends on whether the quality of the cardboard slotting meets the product standards. The slotting quality typically decreases gradually with the wear of the blade edge, leading to phenomena such as burrs, splinters, and waste material. When the product does not meet the standard, the slotting knives need to be replaced.

Although there is a slight difference in the service life of the slotting knives for imported and domestically produced automatic dust-free slotting machines, some issues are similar: first, the slotting knives (upper knives) of the automatic dust-free slotting machines can only be used once, with a short service life; second, the effect of resharpening is poor, leading to unstable slotting quality; third, the wear resistance of the blade edges is poor, with some edges experiencing chipping; fourth, frequent replacement of new knives leads to high costs, increasing production expenses.

Primary Cause Analysis: The wear of cutting tools is related to the paper quality being cut. During the operation of slotting knives, as the blade moves across the paperboard, it experiences relative friction on the surface. Many paperboards contain a high sand content of 5% to 10%, which causes intense scraping against the blade edge, leading to gradual plastic deformation and fatigue wear of the metal on the blade surface. The lifespan of the cutting tool decreases with increased usage time and the sand content (quartz sand, etc.) and impurities in the paperboard being cut.