FIELD: production of protected paper whose security is ensured by high-quality watermarks. SUBSTANCE: method includes preparation of suspension for production of paper containing fibers from 3 to 5 mm long of cellulose and polyvinyl alcohol which are water soluble at temperature from 95 to 100 C; dewatering of suspension for paper making on wire or by some other method with use of embossed surface in which embossing forms profile in form of alternating projections and hollows corresponding to light and dark places of watermarks. Paper formed according to the above procedure and carrying pattern of watermark after dewatering is dried to obtain ready protected paper. EFFECT: higher strength of paper. 7 cl, 4 tbl, 2 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR MANUFACTURE OF SAFETY PAPER | 1996 |
|
RU2138593C1 |
| METHOD OF MANUFACTURE OF PAPER WITH TRANSPARENT SITES AND PAPER WITH TRANSPARENT SITES, MANUFACTURED BY THIS METHOD | 2017 |
|
RU2639809C1 |
| PAPER COMPRISING FIBRILLATED SYNTHETIC FIBRES | 2014 |
|
RU2671745C2 |
| PAPER WITH HIGH EXTENT OF COUNTERFEIT PROTECTION AND METHOD OF ITS MANUFACTURING | 2006 |
|
RU2409473C2 |
| ELEMENT FOR FORMING A WATERMARK | 2015 |
|
RU2673140C1 |
| PAPER CONTAINING SYNTHETIC FIBRES | 2016 |
|
RU2698693C2 |
| IMPROVEMENT OF METHODS FOR MANUFACTURING OF PROTECTIVE SUBSTRATES | 2006 |
|
RU2386541C2 |
| DEVELOPMENTS IN PROTECTIVE SUBSTRATES | 2006 |
|
RU2393099C2 |
| METHOD FOR INSERTING OF ELONGATED MEMBER INTO FIBROUS BASE | 2003 |
|
RU2312947C2 |
| SECURITY PAPER WITH WATERMARK (VERSIONS) AND METHOD OF ITS MANUFACTURING (VERSIONS) | 2011 |
|
RU2475578C1 |
