Watermark sheet, apparatus, and document, and methods for providing the same
A watermark sheet made up of a substrate layer with opposing water and fiber surfaces, a pattern of at least two watermark indicia, and a set of apertures extending from the water surface toward the fiber surface of the substrate layer, is provided. The pattern of at least two watermark indicia is distributed over a continuous area of the fiber surface. The inventive watermark sheet provides watermarks of improved quality. Also provided is a watermark sleeve made up of a cylinder mold and the inventive watermark sheet wrapped around and affixed to an outer diametric surface of the cylinder mold. In addition, methods of manufacturing the watermark sheet, the watermark sleeve, a watermarked paper and a high security document are provided, as well as products resulting from these methods of manufacture.
1. A watermark sheet comprising:
a malleable substrate layer including (i) a water surface and (ii) a fiber surface opposite the water surface;
a pattern of at least two watermark indicia; and
a set of apertures extending from the water surface toward the fiber surface,
wherein the pattern of at least two watermark indicia is distributed over a continuous area of the fiber surface.
2. The watermark sheet of claim 1 , wherein the fiber surface comprises a continuous layer comprising at least one of a plastic, elastic, thermoplastic or thermoset material.
3. The watermark sheet of claim 1 , wherein the watermark sheet has a width that ranges from about 50 millimeters to about 5 meters.
4. The watermark sheet of claim 1 wherein the malleable substrate layer includes watermark areas and background areas where the watermark indicia are set in the watermark areas surrounded by the background areas.
5. The watermark sheet of claim 4 , comprising apertures in the background areas extending through a full thickness of the background areas.
6. The watermark sheet of claim 4 , wherein the watermark indicia comprise a relief structure having sunken places and raised places.
7. The watermark sheet of claim 6 , wherein the watermark areas includes apertures extending through a full thickness of the watermark areas.
8. The watermark sheet of claim 4 , wherein the fiber surface includes electrotype areas integrated with at least one of the watermark areas and the background areas.
9. The watermark sheet of claim 1 , wherein at least some apertures of the set of apertures are formed by drilling from the water surface toward the fiber surface.
10. The watermark sheet of claim 1 , wherein at least one aperture of the set of apertures tapers from the water surface towards the fiber surface.
11. The watermark sheet of claim 4 , wherein the pattern of at least two watermark indicia is formed by ablating the watermark areas.
12. The watermark sheet of claim 4 , wherein the background areas include background indicia formed through differential distribution of apertures of the set of apertures in the background areas.
13. The watermark sheet of claim 8 , wherein an electrotype area is interposed with at least one of the watermark areas such that it is in one or more of: a sunken place or a raised place.
14. The watermark sheet of claim 13 , wherein the electrotype area is formed by ablation.
15. The watermark sheet of claim 1 , wherein the watermark sheet is suitable for wrapping around and affixing to between about 80% and about 100% of an outer diametric surface of a cylinder mold.
16. A watermark sleeve comprising:
a cylinder mold having an outer diametric surface; and
the watermark sheet of claim 1 ,
wherein the watermark sheet is wrapped around and affixed to the outer diametric surface of the cylinder mold.