Flexographic printing machines (often abbreviated as flexo press) perform a printing process which utilizes a flexible relief plate to transfer ink to printed substrate. Every printing job will require its dedicated set of plates. Flexo Stack presses use independent counter impression rollers for each colour. Flexo presses are used to print on different supports: plastic films, paper and aluminium foil. Flexo printers are especially suitable in markets which require flexibility and involve productions of small lots. A Flexo stack printing machine uses independent cylinders as counter impression roll. Many stack presses can be used to print on front and back side of the substrate.