METHOD FOR PROVIDING MATRICES FOR EMBOSSING POLYMERIC FILMS AND THE LIKE, PARTICULARLY FOR IMPRINTING MICROSCOPIC IDENTIFICATION STRINGS AND IMAGES, MATRIX ACCORDING TO THE METHOD, AND POLYMERIC FILM EMBOSSED BY MEANS OF THE MATRIX

摘要

A method (1) for providing matrices (2) for embossing polymeric films (3) and the like, particularly for imprinting microscopic identification strings and images (4), consisting of the following steps: A) providing a uniform background diffraction grating (5) on a flat plate (6) by means of a standard holographic technique; B) subjecting the flat plate (6) to at least one pulsed and localized energy beam by means of a procedure comprised among ablation, vaporization and melting of portion of material that constitutes the plate (6) in the neighborhood of the at least one point of incidence of the beam; C) repeating the exposure (B) to pulsed and localized energy beams according to a sequence of consecutive dots arranged in the configuration of the image of the element to be imprinted (4).