Method and device for producing and transferring diffractive microstructures to a printing material and printing press having the device

摘要

A method and a device for producing and transferring diffractive microstructures to a printing material include applying a fluid to an embossing cylinder and there, during the rotation of the embossing cylinder, solidifying the fluid to such an extent that the fluid is transferred to a printing material in the manner of a film with a solidified microstructure. The embossing cylinder has a cover which is preferably constructed to be either soft as a “flexoshim” or hard as a “nickel shim.” A web-fed or sheet-fed rotary printing press having the device is also provided.

主权项

1. A method for producing and transferring diffractive microstructures to a printing material, the method comprising the following steps:
providing paper or board as the printing material; providing an embossing cylinder with a surface relief microstructure for producing the diffractive microstructures; providing an engraved roll; applying a fluid to the embossing cylinder at an application point by using the engraved roll; initially drying the fluid in a region between the application point and a transfer point onto the printing material, thereby solidifying the fluid and fixing the diffractive microstructures in the fluid; and transferring the solidified fluid with the fixed diffractive microstructures to the printing material in the form of a film.