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 CI presses use a central drum which is common to all colours as counter impression roll. Flexo presses are used to print on different supports: plastic films, paper and aluminium foil. Flexo printers CI (Central Impression) are especially suitable in markets which require process jobs and flexibility (involve productions of small lots). In particular, technological improvements of last 15 years have re-shaped CI flexo presses both in their mechanical construction and in its controls. This improved their printing quality, drastically reduced change over times and consequently downsized their "minimum economical lot".