Patent ID: 8105677
Filing Date: 2012-01-31
Classification: B31B,B32B,B42D,B44B,B44C,G03H,Y10T

Abstract:
1. A product comprising: a paper or cardboard substrate having a surface layer; a first embossed diffractive microstructure area on the surface layer of the paper or cardboard substrate formed by exerting an embossing pressure on said surface layer by an embossing member and a backing member; wherein the first embossed diffractive microstructure area is bare and its grating constant is between 0.4 μm and 3 μm in at least one location; wherein the first embossed diffractive microstructure area is formed of protrusions having a height of 50 to 200 nm; a second embossed diffractive microstructure area on the surface layer of the paper or cardboard substrate, the second embossed diffractive microstructure area formed on portions of the paper or cardboard substrate surface layer forming a bulge or a recess; wherein the second embossed diffractive microstructure area is formed of protrusions having a height of 50 to 200 nm; wherein the first embossed diffractive microstructure area is separated by height from the second embossed diffractive microstructure area by 0.2 to 1.0 mm; and wherein a doubly curved portion of paper or cardboard substrate surface layer is located between the first embossed diffractive microstructure area and the second embossed diffractive microstructure area.