Label printing, a new type of printing that has emerged in packaging printing, is the printing of product labels and signs as its main products. It is printed on special composite paper. For the convenience of branding and labeling, a layer of self-adhesive layer is applied on the back of the paper and adhered to a layer of wax-coated release paper that is easy to peel off. Therefore, this method is also called self-adhesive printing. After printing, use a knife line to roll and peel off the excess blank, leaving a certain shape of the printed product on the release paper. When using it, just peel off the finished product and paste it directly onto the product or packaging. In addition to printing on paper, it can also be printed on aluminum foil. Colored polyester film is a self-adhesive printing material.