Regardless of working width the film needs to have no wrinkles and a certain evenness when passing the corona station. In any case the film tension together with spreader rolls needs to flatten the film when reaching the corona station. Therefore the complete line needs to fulfill the requirement for flatness of film. Nevertheless the rolls (also nip rolls) at pull roll are bigger (and therefore stiffer) at 10.4 m compared to 8.7m to fulfill the requirement for bending and speed at wider working width.