| 摘要 |
FIELD: paper improved through usage of watermarks and/or embossed members for strengthening of paper sheets and documents manufactured from such a paper. ^ SUBSTANCE: paper sheet has at least three corners and three sides connected in said corners, wherein angular strengthening watermarks are formed in each of said corners. Alternatively or in addition to it, angular strengthening embossing members are formed in each of said corners. Also, according to another version, paper sheet has at least three corners and three sides connected in said corners, wherein edge strengthening watermarks are formed in the vicinity of mid portion of each of said edges or said watermarks cover mid portion of each of said edges. ^ EFFECT: increased strengthening of paper sheets and improved protection of documents manufactured from said paper sheets. ^ 21 cl, 8 dwg |
