| 摘要 |
The invention relates to improvements in paper, and in particular to the use of watermarks alone or with embossings for strengthening paper sheets and documents made therefrom. The invention therefore provides a sheet having corners and sides joined at said corners, wherein corner reinforcing watermarks are provided at at least two of said corners, and at least one of which reinforcing watermarks has a border, at least a section of which has a complementary shape with respect to and is located close to at least a section of a border of a further watermark. The watermarks may additionally or alternatively be provided with embossings in a pattern dissimilar to that or the reinforcing watermarks. |
