Improvements in watermarking

摘要

A watermark formation element 20 has an integrated body comprising a watermark forming surface, which has one or more watermark forming regions, and a drainage surface. The watermark formation element has a plurality of drainage channels 22 extending from front surface apertures in the watermark forming surface to the drainage surface. The watermark formation element further comprises an integral tubular spigot which extends from the drainage surface. The spigot has an internal drainage passage 50 and at least one barb located on its distal end for fixing the element to the wire mesh of a cylinder mould cover. The element may be 3D printed