| 摘要 |
FIELD: technological processes; flaky items. ^ SUBSTANCE: invention is related to the field of protective technologies for counterfeit protection of certifying documents, credit cards, bank notes and securities that include plastic structures with protective criteria. Protective element for printing produce comprises multilayer transparent polymer film with the first halftone image arranged on upper surface of upper film layer with resolution of the same order as film thickness has, and the second halftone image arranged on lower surface of one of underlying layers of polymer film and/or on surface of protected produce, on which protective element is arranged, besides the second halftone image is arranged so that whenever images are observed for reflection at various angles or in clear space, observed image gradually changes from positive to negative one or vice versa, at the same time the first and second halftone images are arranged as transparent and/or semi-transparent, and/or luminescent, and/or relief ones. Method for production of protective element includes application of images on surface of film layers by methods of local carbonisation and/or engraving with the help of laser beam in surface layers of film with thickness of 1-10 micrometre, and/or methods of thermodiffusion copying. ^ EFFECT: invention makes it possible to execute individual marking of finished document form in a single cycle of variable images development in polymer film. ^ 13 cl, 4 dwg |
