Patent ID: 7997194

Claim:
A method of printing which comprises: a) applying a layer of a first fluid ink onto a surface of a substrate, which first fluid ink comprises an admixture of at least one colorant, and at least one ethylenically unsaturated monomer, ethylenically unsaturated oligomer or ethylenically unsaturated polymer, which first fluid ink has a maximum of 10% volatile components; thereafter b) applying a layer of a second fluid ink onto the layer of the first fluid ink, which second fluid ink comprises an admixture of at least one colorant, and at least one ethylenically unsaturated monomer, ethylenically unsaturated oligomer or ethylenically unsaturated polymer, which second fluid ink has a maximum of 10% volatile components; thereafter c) optionally sequentially applying one or more additional layers of additional fluid ink onto at least one prior layer, which additional fluid ink comprises an admixture of at least one colorant, and at least one ethylenically unsaturated monomer, ethylenically unsaturated oligomer or ethylenically unsaturated polymer, which additional fluid ink has a maximum of 10% volatile components; thereafter d) optionally applying a layer of a coating composition onto at least one prior layer, which coating composition comprises at least one ethylenically unsaturated monomer, ethylenically unsaturated oligomer or ethylenically unsaturated polymer, which coating composition has a maximum of 10% volatile components; and thereafter e) simultaneously exposing said layers with sufficient electron beam radiation to cause the ethylenically unsaturated monomer, ethylenically unsaturated oligomer or ethylenically unsaturated polymer in said layers to polymerize or crosslink such that they become dried; wherein the first fluid ink, the second fluid ink, each additional fluid ink, if present, and the coating composition, if present, have a viscosity of from about 5,000 cps or more; and wherein the first fluid ink, the second fluid ink, each additional fluid ink, if present, and the coating composition, if present, maintain a maximum 10% increase in viscosity prior to electron beam radiation.