Flexographic requirements for film types

When the flexographic plate is exposed on the front of the plate making machine, to ensure the quality of the film and the flexographic printing surface, the plate making machine is equipped with a vacuum pump to vacuum the film. At the same time, the film must be rough (matte) on the side close to the flexographic plate. This prevents the presence of air bubbles between the film and the flexo plate and affects the quality of the flexographic printing surface. The pressure strip used for the press roll and the flexographic plate edge is also a type with an indentation and lateral air conduction. In addition, there are specific requirements for the blackness and transparency of the film.