| abstract |
FIELD: textiles, paper. n SUBSTANCE: invention relates to marked paper products. Described is a method of production of a marked paper product , using irradiation of the area of the paper product with an electron beam with a dose of 0.10 Mrad to about 5 Mrad, where the electrons have the energy of about 0.25 MeV to 10 MeV. The irradiation is carried out under the conditions selected to change the functionalisation of the specified area of the paper product. The said area may be made in the form of a "watermark" or a symbol. n EFFECT: invention provides the marking on the paper products, which is invisible for the naked eye, which is difficult to copy without enough sophisticated equipment, which makes it difficult to counterfeit. n 7 cl, 5 dwg |