| 摘要 |
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.
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