Method and device for producing a security paper with watermark and integrated window security element

摘要

The invention relates to a device (10) for producing a security paper (60) with watermark (72) and integrated window security element (82), having - a first paper layer production device (12) for forming a first paper web (20) and for providing the first paper web ( 20) with watermarks (72), - a first paper layer production device (14) for producing a second paper web (30), - a take-off screen (16) for merging and firmly connecting the second paper web (30) to the first paper web (20), a device for feeding an endless security element (32; 82) in the region of the watermarks (72) between the first and second paper web when merging the paper webs (20, 30), and a suction device (50) for removing paper fibers from the second paper web (30) while still wet. The invention also relates to an associated method and to a corresponding multilayer security paper and document of value.