Variable data clear mark imaging

B - Operations – Transporting – 42 – D

Patent

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B42D 15/00 (2006.01) A63F 3/06 (2006.01) B41M 3/14 (2006.01)

Patent

CA 2140886

A security document is produced from a paper substrate having invisible hydrophobic toner blended into the paper. The clear toner is produced by milling (11) and classifying (12) a polyester resin, mixing it with a silica flowing agent (13), and then electrostatically imaging the toner (16) onto the paper substrate. An infrared absorbing a UV responsive dye may be added to the toner so that it is visible under infrared/ultraviolet light respectively. When applied to the paper the toner is snow white, but after infrared heat fusing (18) it blends into the paper and is substantially invisible. The security indicia is easily made visible by passing a conventional marker nib over it, or other mechanism for applying a water based low concentrate colored ink (20) which is readily absorbed by the surrounding paper, but not by the hydrophobic security indicia.

On produit un document de sécurité à partir d'un substrat papier dans lequel un toner hydrophobe invisible est mélangé dans le papier même. Le toner invisible est produit comme suit: on broie (11) et on classifie (12) une résine polyester, on la mélange avec un agent d'écoulement (13) au dioxyde de silicium puis on dépose par électricité statique le toner (16) sur le substrat papier. On peut ajouter dans le toner un colorant qui absorbe l'infrarouge ou les ultraviolets pour qu'il soit respectivement visible sous la lumière infrarouge ou ultraviolette. Lorsqu'on l'applique sur le papier le toner est blanc comme la neige mais après thermofusion à l'infrarouge il se mélange au papier et devient sensiblement invisible. Le repère de sécurité est facilement rendu visible en passant au-dessus de sa surface une pointe de marqueur classique ou tout autre mécanisme qui sert à appliquer une encre colorée (20) faiblement concentrée à base d'eau qui est rapidement absorbée par le papier mais pas par le repère de sécurité hydrophobe.

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