support information, including identification and plaque index

摘要

A plastic film (5) applied to a carrier sheet (3) is roughened on one surface (7) and, after the application of the information characters (2), for example by hand or by means of a typewriter, onto this surface is covered by a transparent coating (6). The refractive index of the coating (6) is, in the dry state, equal to the refractive index of the material of the plastic film (5) so that the surface (7), made matt by the roughening, of the plastic film is invisible. IMAGE