1. The toner with poor quality may cause agglomeration when used for a long time in a humid and temperature-changing environment. During use, the components of the toner cartridge may be damaged, which may affect the image quality. It will shorten the life of the toner cartridge. 2, the printer through the fuser roller to heat the toner, in order to melt the toner pressed into the paper, different printers, the fuser roller heating temperature deviation, the melting point range of a wide range of carbon powder, fuser with a different printer fuser Good performance, use good print quality on different printers. 3. The carbon powder with a narrow melting point range has unstable print quality. When the melting point of the carbon powder is higher than the heating temperature of the fixing roller, the carbon powder is not melted enough to completely infiltrate the paper fibers, resulting in unstable image fixing; When the melting point is lower than the heating temperature of the fixing roller, the toner is excessively softened and sticks to the fixing roller, contaminating the fixing roller, and the printing paper is easily contaminated. Source: Network