Process for preparing printed sheets with optical effects
AssigneeJuan Grifoll Casanovas
InventorPalmira Gili Picoy
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Abstract
A process for printing a sheet with selected optical effects includes printing on the sheet by conventional printing a pattern or design, thereafter coating at least part of the design with a resin, thermoplastic lacquer or other transparent material which impregnates the surface of the sheet and then engraving the selected area by applying pressure and heat to produce optical effects; the resin that is applied is polymerizable by ultraviolet rays from within a transparent calendar used for the engraving and is polymerized at the same time as the engraving is effected.
Claims7
A process for making a printed sheet with an optical enhancement, in a substantially continuous operation, where the sheet is non-plastic, absorbent material, comprising the steps of first printing material on at least one surface of the sheet, then coating a portion of the sheet with a polymerizable resin at least where the printing has been placed, engraving the resin by passing the portion over a transparent calendar and exposing the resin to ultraviolet radiation from within the calendar to cure the resin.
The process as claimed in 1 including the step of using a sheet having an area previously printed and having other areas without printing thereon and the step of applying resin to said other areas.
Dependencies are inferred from the claim text.