DIN 7161 has nothing to do with paper or pulp. Adding —paper in your search helps filter out:
There is no free legal PDF of DIN 7161. Standards are copyrighted. Free downloads from third-party sites (PDF Drive, Scribd, etc.) are unauthorized and may contain outdated, incorrect, or virus-infected files. If you see a “free PDF,” it is almost certainly an infringement. din 7161 pdf