The cutting performance of the mechanical blade depends to a considerable extent on the quality of the sharpening, which in turn depends on the sharpening equipment and a reasonable sharpening process.
        For sharpening equipment, it is recommended to use a vertical shaft sharpener, the angle of the blade is easy to ensure. It is recommended to choose white corundum (code-named WA) for grinding wheel. It is not easy to generate heat during sharpening. At the same time, cooling fluid must be continuously poured on the contact surface of the cutting edge and the grinding wheel during sharpening. It is recommended to use No. 1 metal emulsion. The whole sharpening process is best divided into rough grinding, fine grinding and finishing. Rough and fine grinding are carried out on the sharpening machine. The smoothing needs to be carried out by the sharpening machine and manual.

        The finishing steps are: 1. Think that the blade has been sharpened (no sparks are seen), then do not need to feed, let the grinder reciprocate several strokes by itself, the stroke depends on the length of the blade, the short is less stroke. 2. Remove the blade from the sharpener and manually grind with whetstone to obtain an excellent sharp edge. The method is to use oil-soaked oil stone to gently remove the tiny burrs generated by the knife sharpener on the cutting edge, and close the oil stone to the rake face to rotate the oil stone to the full length of the blade. 3. Use the same method to move the whetstone to the full length of the blade after grinding, but tilt the whetstone slightly at an angle, preferably not more than 1 °, after grinding by the above method, an ideal blade is considered to be completed. 4. The wedge angle is also called the cutting edge angle. It is the main angle that directly affects the cutting performance. The size of the angle depends on the cutting object. 5. Paper cutter is an essential equipment for printing enterprises, and it is widely used in printing and publishing, papermaking, packaging, decoration and other industries, and is widely used. Its most basic function and application is cutting. The final cutting element is the blade. On the one hand, the quality of the blade and whether it is reasonably used directly affect the cutting quality, on the other hand, the unreasonable sharpening angle and use will seriously damage the accuracy and life of the paper cutter. Therefore, using maintenance and sharpening the blade is the first step in the application and maintenance of the paper cutter.