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After printing, aluminum foil requires different specifications and dimensions, necessitating slitting on a slitting machine. The cutting tools used are circular blades with circular pads, known as shear-type blades. Since the cutting edges are precision-machined onto the outer surface of a circular ring according to specifications, the slitting blade line performs one cut each time the upper and lower rollers complete a full rotation. For each cutting point, the blade engages the material line through contact during rotation. The operating principle of a slitter resembles that of scissors, achieving the slitting effect on aluminum foil through the two opposing cutting edges on the upper and lower rollers. When the gap between the upper and lower cutting edges is large during slitting, the aluminum foil is difficult to cut cleanly. Occasionally, it may be cut, but the end surface will be uneven with noticeable irregularities. Conversely, a small gap between the cutting edges causes longitudinal grooves to appear on the aluminum foil surface. Typically, when installing the blades before slitting, the gap between the cutting edges is adjusted to 0.20-0.30mm. This ensures a smooth foil edge. During slitting, the foil's rebound and impact reduce metal-to-metal contact between the upper and lower rollers. Examining the blade cross-section reveals that only one side of the lower roller blade is engaged, enhancing mechanical strength. When used properly, blade chipping is extremely rare.