Method for producing an optically variable image carrying shim
AssigneeBASF SE
InventorsMark Robert Dicker, David R. Boswell, Steven Winton, Katia Studer, Sebastien Villeneuve, Bruno Spony
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Abstract
The present invention relates to a method for producing a duplicated shim and the duplicated shim obtainable by the method. The duplicated (UV-cured) shim, independent of any carrying device (like a cylinder or belt), can be applied directly to the surface of the transfer roller (and impart the surface OVD structure into a clear lacquer) in a similar way to conventional nickel shims.
Claims15
An UV-curable composition having sufficient concentration of UV-reactive functions for use in the production of a duplicated shim, wherein the duplicated shim shows, once cured, a sufficient crosslinking density and polymerization degree higher than 95% (measured by ATR spectroscopy by following the disappearance of the acrylate band at 1410 cm−1).
The method according to 9, comprising the steps of:
- A) printing an ultra violet curable varnish to at least a portion of a paper, aluminium, or another opaque substrate,
- B) contacting at least a portion of the varnish with optically variable image forming means, wherein an optically variable device or other lens or engraved structure is cast into the surface of the lacquer with the duplicated shim, wherein the processing to the duplicated shim involves mounting the sheet of a plastic material to a cylinder, or forming a belt system comprising a quartz tube having an UV lamp mounted inside, a chilled drive roller and a belt of the sheet of the plastic\material having the optically variable device or other lens or engraved structure thereon;
- C) curing the varnish via an UV lamp,
- D) depositing a metallic ink on at least a portion of the cured varnish, and
- E) optionally printing further colours.
The method according to 9, comprising the steps of:
- A) printing an ultra violet curable varnish to at least a portion of a transparent filmic substrate,
- B) contacting at least a portion of the varnish with optically variable image forming means, wherein an optically variable device or other lens or engraved structure is cast into the surface of the lacquer with the duplicated shim, wherein the processing to the duplicated shim involves mounting the sheet of a plastic material to a cylinder, or forming a belt system comprising a quartz tube having an UV lamp mounted inside, a chilled drive roller and a belt of the sheet of the plastic\material having the optically variable device or other lens or engraved structure thereon;
- C) curing the varnish via an UV lamp,
- D) depositing a metallic ink on at least a portion of the cured varnish, and
- E) optionally printing further colours.
Dependencies are inferred from the claim text.