Importance

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Abstract

Durable, easily recognizable and easy-to-feel tactile marks are provided which may be incorporated into security documents, such as banknotes, to assist visually impaired people in validating such security documents. Deposits are printed onto the substrate, using an ink, resin or ink-like printing material, in a predetermined pattern to form tactile marks adhering to the substrate. A sufficiently high pressure is applied to the substrate with the printed tactile marks to calender the tactile marks, thereby forming corresponding protrusions in the substrate on the opposite sides of the printed tactile marks. An energy curable printing material may be used to print the deposits and the calendering of the tactile marks may be performed by intaglio printing.

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First Claim