COLORED CHEMICAL MULTIFILAMENTOUS FIBER FOR PROTECTION OF A PAPER AGAINST A FAKE Russian patent published in 2003 - IPC

FIELD: protection of documents and bank notes against a fake. SUBSTANCE: invention presents the colored chemical multifilamentous fiber intended for production of business and valuable papers, protected against a fake. In the offered fiber each filament of the fiber has parts colored in two and more colors alternating along the filament length of 0.3-1.5 mm. The offered fiber has the parts alternating on its length by different cross-sections with a ratio of the square areas of the cross-sections as 1.01 - 2.3. EFFECT: increased strength of the protective fibers retention in the paper, non- aggregation in it, provision of colors contrast range on the fibers used for protection of the special use paper against a fake. 2 cl, 2 dwg