An application device (18) for a
coating system (10) for vapor deposition of
metal vapor onto films to form a
metal layer is specified, wherein the application device (18) has a
vacuum chamber (34) and is configured to apply a masking fluid to the film to be subjected to vapor deposition in the
vacuum chamber (34), wherein the application device (18) comprises a transfer roller (26) and a printing roller (28) which are arranged in the
vacuum chamber (34), wherein a printing form (30) which is in contact with the transfer roller (26) is arranged on the printing roller (28). The application device (18) comprises an
evaporator (32) for the masking fluid, which is configured to generate a masking fluid vapor. The application device (18) has a masking fluid vapor metering
system (42) associated with the
evaporator (32), which faces the transfer roller (26) and is configured to meter different amounts of masking fluid vapor transversely to the longitudinal axis of the transfer 15 roller (26) so that
layers of masking fluid that have different local thicknesses are deposited on the transfer roller (26). Furthermore, the invention relates to a
coating system (10), to a method for vapor deposition onto a film, to a wound
capacitor and to the use of a transfer roller (26).