Problems with fastness after finishing

Most sheetfed digital presses use toner instead of traditional inks. When the toner passes through the heating roller, it is melted by heat and the ink is fixed on the paper surface. In the process of hot-melting, there is a small amount of solvent released. Although the amount of such solvents is small, they are all adsorbed on the paper surface and affect the adhesion of the binding glue and the paper. The fastness of binding is sometimes related to the fastness of the film. Digitally printed book covers are often colored. Because of the small number of prints, it is also printed using a color toner digital printer. Toner is less sticky to coated paper, and toner peeling is often seen at the turn of the spine.

In general, this short version of the business is not suitable for surface coating and lamination, because the surface of the toner is poorly adherent, slightly crumpled, and the plastic film and the paper are separated. Usually, the film is used only for the cover of a book printed with traditional ink. If the customer insists on the requirement, it is more reasonable to cover the outside of the cover. This will not cause the book block and cover to fall off.