Abstract: There is described a method and a system for cleaning an ink chamber (1) of a printing unit. The system includes a storage tank (10) which via a high-pressure pump (9) is connected with a hydrophore (2). In the hydrophore a high pressure is built up, and the hydrophore is connected with cleaning nozzles (40) via a valve (5). Thus it becomes possible to inject a shot of cleaning liquid into the chamber by switching the valves (5). The cleaning nozzles are preferably designed as a mushroom-shaped plug (40) with a stem (41) which is mounted in the chamber wall and which has a circular domed top (43) of elastic, resilient material. When injecting cleaning liquid, the elastic plug will spray cleaning liquid out into the chamber, and after shutting off the pressure, there will be a self-closing effect.

Abstract: There is described a printing unit and a method for printing with flexographic inks. The printing unit includes a screen roller engaging a doctor blade system (3), and which is in continuous operation, either by engaging a motor (10) or by operation by the transmission (2) of the printing machine. The screen roller (1) of the printing unit interacts with a rubber sheet (16) which is disposed on a rubber sheet cylinder (4) at a position between a printing plate cylinder (5) and a back-pressure cylinder (6). A slot (7) is provided in the rubber sheet, used when the screen roller (1) is to be engaged with the rubber sheet (17).

Abstract: There is described a method and a system for cleaning an ink chamber (1) of a printing unit. The system includes a storage tank (10) which via a high-pressure pump (9) is connected with a hydrophore (2). In the hydrophore a high pressure is built up, and the hydrophore is connected with cleaning nozzles (40) via a valve (5). Thus it becomes possible to inject a shot of cleaning liquid into the chamber by switching the valves (5). The cleaning nozzles are preferably designed as a mushroom-shaped plug (40) with a stem (41) which is mounted in the chamber wall and which has a circular domed top (43) of elastic, resilient material. When injecting cleaning liquid, the elastic plug will spray cleaning liquid out into the chamber, and after shutting off the pressure, there will be a self-closing effect.

Abstract: A doctor beam (1) is provided for a doctor blade for application in a printing unit. The doctor beam comprises a U-shaped channel. At least the U-shaped channel (3), which is formed in a metal beam, is provided with a fibre coating (6) preferably made of carbon fibres. Hereby is achieved resistance against corrosive attack on the metal by cleaning agents and/or printing inks.

Abstract: The invention describes a sheet offset machine in which may be applied an air-drying ink/varnish. The invention furthermore concerns a drying unit that may be used for drying air-drying ink/varnish. The drying unit is disposed in connection with a cylinder surface and includes an integrated ventilator with suction and exhaust duct. These are used for sucking in fresh air and for exhausting used air having swept a wet print on the print carrier. The ventilator is connected to nozzles having an elongated nozzle orifice oriented in parallel with the center axis of the cylinder surface. The nozzle orifice is provided immediately opposite the cylinder surface for blowing an air stream towards counter pressure on the print carrier while it is disposed on the cylinder surface. By using such a system is achieved an efficient and energy economical drying of the applied inks/varnishes.