As a tool of office modernization, photocopiers have been widely used. Because of its high speed and convenience, photocopiers are more widely used in archives, libraries and other departments.

The formation of copying: the copier transfers the toner to the paper through photoelectric, transfer printing, fixing and other steps, and is firmly fixed on the paper through fixing. In this way, the factors that affect the fastness of copying handwriting are nothing more than paper, toner and fixing. Let's start with paper. Paper is composed of cellulose, hemicellulose, lignin and other components. The higher the cellulose content, the better the paper quality, and vice versa. Copy paper is made by special processing, which has the advantages of smoother surface, higher hardness, better durability, less breakage and higher cellulose content than ordinary paper. Therefore, its quality is better than ordinary paper. Toner is the source of handwriting, and its quality has a very important influence on the fading of photocopy handwriting.