Printing machine and printing process

摘要

The surface (12) of the printing form (2) comprises a material whose wetting properties are reversible between a first state with a very small contact angle and a second state with a relatively large contact angle. The first state is brought about by the influence of light with a wavelength shorter than a material-specific wavelength. A cleaning device (18) is provided for the printing form surface. Independent claims are also included for printing processes where a molecular water layer is formed on and removed from the printing form surface.