METHOD FOR MANUFACTURING FRAUD-PROOF PAPER (VERSIONS) AND FRAUD-PROOF PAPER (VERSIONS) Russian patent published in 2009 - IPC D21H21/42 D21F1/00 D21F11/00 B42D15/00 

FIELD: textiles, paper.

SUBSTANCE: method pertains to manufacturing of fraud-proof paper used for manufacturing of fraud-proof polygraphic products. According to the first variant of the method for manufacturing fraud-proof paper, paper linen with more than 2 mm width protective tape is formed, the said tape being inset into the aforesaid linen at its formation on a grid cylinder. Note that a protective tape is introduced into the mass so as to form, prior to its contact with the cylinder, a mould fibrous layer, excluding the areas on the cylinder surface where no fibrous layer is formed due to the absence of filtering capacity. The protective tape is placed on the cylinder in such a manner that part of its surface matches with cylinder elements on which formation of the layer does not occur, zones of access being formed, i.e. windows from the grid side of paper. Areas on the cylinder surface with absence of filtering capacity are created either by closing grid with filigrane, or by filling the grid with waterproof material, or by furnishing the grid with through holes. From the side opposite to that of the grid, the protective tape is fully or partially open, through windows being formed in places of windows matching from the grid side and full or partial exit of the protective tape from the opposite side of paper. According to the second, third and fourth versions, paper linen with more than 2 mm width protective tape is formed, exit of the protective tape being provided on both sides of paper linen to produce the effect of a through window.

EFFECT: better fraud-proofness of paper.

32 cl, 15 dwg