Abstract: An apparatus for producing surface structures on a drum with an electron beam, comprising beam equipment having a beam generator that generates the electron beam, a focal length adjustment as well as a focusing adjustment, and a vacuum chamber which accepts the roller, the beam equipment comprising a passage for the electron beam in a wall that separates the beam equipment from the vacuum chamber, the passage being fashioned as a nozzle having a nozzle jacket whose inside diameter is selected such that the electron beam defocused with the focusing adjustment charges at least a part of the nozzle jacket in a cleaning interval, the nozzle jacket comprising a nozzle base secured in the wall and an end segment that projects beyond the wall in a direction toward the vacuum chamber, and a taper connecting said end segment to the nozzle base, the taper being radially limited by a channel, and a method of operating such an apparatus.

Abstract: In the implementation of the method for after-treatment of a texture drum wherein a surface structure is generated in the region of a surface with an electron beam, the texture drum, following a charging occurring within a working interval with an electron beam having an energy density that generates a recess, is charged during an after-treatment interval by an electron beam having an energy density which leaves the surface structure essentially as it was formed.

Abstract: In the implementation of the method for manufacturing a surface structure in the region of a surface of a texture drum with an electron beam, the texture drum is charged with an electron beam having an energy density that produces the recess during at least two working intervals, and is charged therewith while a recess is being produced in the region of the surface. During at least one intermediate interval separating the working intervals from one another, the surface is charged by an electron beam having an energy density that essentially leaves the recess in terms of its expanse.

Abstract: In the implementation of the method for manufacturing a texture drum, a surface structure is produced in the region of a surface with an electron beam, preceding a charging occurring within a working interval with an electrons beam having an energy density generating a recess, the texture drum is charged during a pre-treatment interval by an electron beam having an energy density that leaves the surface structure essentially as it was formed.