Abstract: The invention relates to a vacuum unit for a device used to structure the surface of a workpiece (24), in particular a plate, such as e.g. a flexographic printing block, by means of radiation, in particular laser radiation, the workpiece being a cylinder or a plate that is located on a cylinder during the engraving process. Said unit comprises a hood (11) that covers an interaction zone between the radiation and the surface of the workpiece and that has a vacuum channel (12), whose inlet (15) lies opposite the surface of the workpiece in the operating position of the hood (11) and which can be connected to a vacuum line (38). The aim of the invention is to prevent the abraded and decomposition products that form during the machining of cylindrical workpieces, such as e.g. aerosols, vapour, fumes or gases from being released into the environment.

Abstract: The invention relates to a vacuum unit for a device used to structure the surface of a workpiece (20), in particular a plate such as e.g. a flexographic printing block, by means of radiation and especially laser radiation. Said unit comprises a hood (10), which in its operating position covers an interaction zone between the radiation and the surface of the workpiece, consisting of a rear face (11), to which a vacuum line (38) can be connected, two lateral walls (16) comprising end edges (19), which lie opposite the workpiece (20) in the operating position of the hood (10), and two leading walls (17, 18), which are located between the lateral walls (16), run transversally to the latter and which together with the two lateral walls (16) delimit a vacuum channel (14) in the hood (10), said channel comprising an inlet (15), which lies opposite the workpiece (20) in the operating position of said hood (10).