1. Material of knife making.
        The cutter of the single-piece paper cutter is made of high-temperature insert welding of the blade and the blade body. The blade is made of high hardness chromium tungsten manganese steel, and the blade body is made of low carbon steel. The durability of the cutter is directly proportional to the hardness of the steel used for the blade part. For high-quality blades, the hardness of the blade part after quenching can reach HR55 ~ 60.
        Second, the shape and angle of the sharpener of the paper cutter.
        On single-sided paper cutters, single-edged cutters are generally used, with a sharpening angle between 19 ° and 23 °. However, the sharp edges of this shape make the bevel of the cutter bear the pressure from the part of the paper stack being cut during the cutting process. Under the friction of the paper edge, the bevel of the blade is quickly worn away. The double-edged knife has obvious advantages. Its sharpening helps to reduce the load of the machine and improve the accuracy of cutting. Therefore, the angle of the sharpening edge should be as small as possible when the tool material permits, and considering the magnitude of the shear resistance of the cut object.
        3. The quality of paper cutter sharpening.
        The higher the quality of the sharpening knife, the longer the service life of the cutting knife, the better the cutting quality.
        4. Types of cutting materials.

        During the cutting process, the speed at which the cutter edge of the paper cutter becomes blunt is related to the wear resistance of the cut material. When cutting paper, the speed at which the blade becomes dull is related to the texture of the paper and how much the ash content is. When cutting harder paper with a larger ash content, the faster the blade becomes dull.