METHOD OF PAPERMAKING WITH MULTI-TONE WATERMARK, PAPER WITH MULTI-TONE WATERMARK, PRINTING PRODUCT WITH MULTI-TONE WATERMARK Russian patent published in 2013 - IPC D21H21/40 D21F1/44 B41M3/10 

FIELD: textiles, paper.

SUBSTANCE: method of papermaking with multi-tone watermark lies in the use for casting and moulding of the paper web on a papermaking machine of the relief mask representing a partially water-permeable moulding element. The element is formed on the surface of the cylinder forming fabric, or on the dandy roll of the fourdrinier former. The mask has a variable height of the image area of the watermark, created by the relief stamping of the fabric, with electrotype and/or conjoint stamping of the fabric and electrotype and/or use of several layers of the electrotype. Individual, successive layers of electrotype in the mask can have openings which are different in the diameter and the density of location. The mask is assembled out of several layers of perforated plates of metal or plastic plates or composite materials. The paper and printing product made by the above method is claimed, which are protected against forgery.

EFFECT: expansion of technological capabilities of the method of production in the paper of the watermark with the increase in the capacity of the watermark as an element of protection against forgery.

7 cl, 10 dwg