FILMS, PRINTING FORMS AND PRODUCING PROCESS THEREOF

摘要

Subject of the invention is a process of making films and printing forms to be used for the manufacture of special prints, mainly securities. The subject of the invention is also the films and printing forms which are produced by the process of this invention. These are produced by forming a pattern on a carrier, then copying it by laser scanner and fixing it on film per colour, developing the film and making a print thereof, then making a sensitized printing form of the developed and controlled film. The process is characterized by producing, on a transilluminatable carrier, an optical grating as a special original, containing faults made deliberately and consisting of points with irregular contours and then by copying the so-produced optical grating with a laser scanner coded in the well-known way.