Abstract

Ink composition which is invisible to the naked eye, which is fluorescent, for inkjet printing, and which is liquid at ambient temperature, comprising: a) a binder, comprising at least 0.5% by weight, with respect to the total weight of the ink, of at least one thermoplastic polyamide resin, soluble in ethanol; b) a solvent comprising at least 10% by weight, with respect to the total weight of the ink, of one or more organic solvent compound (s); c) at least 0.05% by weight, with respect to the total weight of the ink, of one or more dye(s) and/or pigment (s) which is (are) invisible to the naked eye and which is (are) fluorescent in the visible region only when they are exposed to ultraviolet light and which are chosen from rare earth metal chelates and rare earth metal complexes; d) less than 10% by weight of water, with respect to the total weight of the ink. Marking process, substrate and method for identifying items.

IPC Classes  ?

• C09D 5/22 - Luminous paints
• C09D 11/00 - Inks

Abstract

For printing, the principle of the continuous deflected jet is used: a device discharges a continuous stream of a liquid, which is deflected by an electric field created by a plurality of deflecting electrodes and directed toward a gutter. The printing of drops is performed by fragmenting the continuous jet into a segment formed opposite a shield electrode upstream of the deflecting electrode, so that the segment is not deflected and can be directed toward a substrate. The deflection electrodes (22, 24) are separated by an insulator (26) and a variable potential is applied to each electrode; the potential for the entire set of electrodes cancels out such that the jet (2) is not charged.

IPC Classes  ?

• B41J 2/095 - Ink jet characterised by jet control for many-valued deflection electric field-control type