An intaglio printing process for all-over printing of large...

B - Operations – Transporting – 41 – C

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B41C 1/045 (2006.01) B41F 9/06 (2006.01) B41M 1/10 (2006.01) B41M 3/14 (2006.01) B41N 1/06 (2006.01)

Patent

CA 2345227

Printing plates for all-over printing of large areas by the intaglio printing proc- ess, a method for producing the printing plates and data carriers, in particular bank notes, with large-area printed images produced by the intaglio printing process are proposed. Flawless inking is ensured by providing partitions in the engraving of the printing plate which rise up vertically from the base of the engraved area and have at least a height of 50% of the engraving depth. The partitions largely prevent ink from being wiped out of the engraved areas when ink is wiped off the printing plate sur- face. This permits a large printed area to be covered all over with ink layers on a data carrier. By special arrangement and design of the partitions one can also pro- duce fine structures in the printing area which are recognizable only with magnifying aids depending on the selected distances between the partitions.

L'invention concerne des plaques d'impression destinées à l'impression complète de grandes surfaces selon le procédé d'héliogravure, un procédé de production de plaques d'impression et de supports de données, notamment de billets de banque, comportant des images imprimées réalisées sur une grande surface selon le procédé d'héliogravure. Pour garantir un encrage sans défaut, la gravure de la plaque d'impression présente des segments séparateurs qui s'élèvent perpendiculairement à partir de la surface de base de la zone de gravure et dont la hauteur représente au moins 50 % de la profondeur de gravure. Les segments séparateurs permettent d'éviter, dans une large mesure, que l'encre couleur ne soit enlevée de la zone de gravure lorsque l'on essuie l'encre couleur de la surface de la plaque d'impression. On peut ainsi recouvrir entièrement la surface d'une zone d'impression d'un support de données avec des couches d'encres. Une disposition et une conception particulières des segments séparateurs permettent cependant de produire des structures fines dans la surface d'impression qui, selon les écartements choisis entre les segments séparateurs, ne peuvent être reconnues qu'avec des moyens auxiliaires permettant un agrandissement.

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