1. The sharp-edged blade is put into use. If no hard foreign material is touched in the cutting, it will abruptly collapse. Analysis: The main cause of this problem is the inaccurate infeed of the cutting edge during the grinding process (increase in the feed rate), resulting in excessive temperature during grinding (ie, the temperature of the contact point between the blade and the grinding wheel is too high). The blade will be "burned". 2, cut the knife in the cut not the end (also known as impervious). Analysis: This is mainly due to the sharpness of the edge of the knife. 3, just after the blade is sharpened, the cut surface of the cut paper product will have a bad cut in the knife flower and cutting process. The more reason is that the blade is too soft due to overheating. The quality of the knife's grinding is critical to the quality of the cut.