Method for treating the surface of metal foils with uv-cured protective varnish
AssigneeBrasilata S/A Embalagens Metalicas
InventorAugusto Ferreira FRANÇA
Life of this patent
Estimating the term…
Abstract
The method includes the steps of: applying atmospheric plasma on each area portion of the surface of a metal foil to be treated; increasing the surface free energy of the metal foil, making said surface free energy compatible with the surface tension of the varnish to be applied to the metal foil; applying a UV-cured varnish layer, which may be a oligomer, a monomer or a photo-initiator, having a solids content of 99% to 100% to the surface of the metal foil subjected to the atmospheric plasma; and curing the varnish layer using UV radiation to form a varnish coating adhered to the surface of the metal foil.
Claims16
A method for treating the surface of metal foils with UV-cured protective varnish, the method comprising the steps of:
- applying atmospheric plasma on each area portion, of a surface to be treated, of a metal foil, increasing a surface free energy of the metal foil, making the surface free energy compatible with a surface tension of the varnish to be applied to the metal foil;
- applying, on the surface of the metal foil, submitted to the atmospheric plasma, a UV-cured varnish layer, selected from compounds of oligomers, monomers and photo-initiators, with a viscosity from 40 to 60 Sec CF4/25° C., specific weight from 1.01 to 1.05/25° C. and with a solids content from 99% to 100%;
- and
- curing the varnish layer, applied on the surface of the metal foil, by polarization of the varnish compounds, by interaction of the photo-initiator with UV radiation in a curing unit, forming a varnish coating adhered to the surface of the metal foil.
Dependencies are inferred from the claim text.