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Machine readable security features

A technology with safety features and safety, applied in the field of safety ink, can solve the problems of limited production complexity, low thermal stability, etc., and achieve the effect of high absorption and high chemical stability

Active Publication Date: 2020-12-22
SICPA HLDG SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008]Organic NIR absorbers are generally of limited use in security applications due to their inherent low thermal stability and manufacturing complexity

Method used

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  • Machine readable security features
  • Machine readable security features
  • Machine readable security features

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0166] According to one embodiment, the identification device comprises: a first source (such as a VIS LED) emitting at a first wavelength in the visible light range (400nm to 700nm); a second source (such as a NIR LED) emitting at a first wavelength in the NIR range ( 780nm to 1400nm); and a broadband detector (such as a photomultiplier tube). The first source and the second source emit at time intervals, allowing the broadband detector to output output signals that correspond to VIS emissions and NIR emissions, respectively. The two signals (VIS signal to VIS reference, and NIR signal to NIR reference) can be compared independently. Optionally, the two signals can be converted into a difference (or ratio) value, and the difference (or ratio) value can be compared to a difference (or ratio) reference stored in a database.

[0167] According to another embodiment of the detector unit, and with the aim of increasing the operating speed, said detector may comprise two detectors...

Embodiment

[0175] The invention will now be described in more detail with reference to non-limiting examples. The following examples provide more details on the preparation and use of security inks for printing machine readable security features, which independently comprise IR absorbing materials.

[0176] Four security inks have been prepared and coated on substrates:

[0177] i) oxidatively drying gravure security inks (Examples E1, E2 and Comparative Example C1),

[0178] ii) UV-Vis curable screen printing security inks (Examples E3, E4 and Comparative Example C2),

[0179] iii) heat drying rotogravure security inks (Examples E5, E6 and Comparative Example C3), and

[0180] iv) heat-drying screen printing security ink (embodiment E7, E8 and comparative example C4)

[0181] Among them, E1, E3, E5 and E7 contain anhydrous iron(II) orthophosphate (IR-A 1) with a phosphomanite structure,

[0182] where E2, E4, E6 and E8 contain potassium iron(II) orthophosphate without crystallizatio...

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PUM

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Abstract

The present invention relates to the field of security inks suitable for printing machine readable security features on substrate, security documents or articles as well as machine readable security feature made from said security inks, and security documents comprising a machine readable security feature made from said security inks. In particular, the invention provides security inks comprisingone or more IR absorbing materials selected from the group consisting of crystal water-free iron(II) orthophosphates of the general formula Fe3(PO4)2 and having a graftonite crystal structure, crystalwater-free iron(II) metal orthophosphates, crystal water-free iron(II) metal phosphonates, crystal water-free iron(II) metal pyrophosphates, crystal water-free iron(II) metal metaphosphates of the general formula FeaMetb(POc)d, wherein said security ink is an oxidative drying security ink, a UV-Vis curable security ink, a UV-Vis curable security ink or a combination thereof.

Description

technical field [0001] The present invention relates to the field of security inks suitable for printing machine-readable security features on substrates, in particular security documents or objects. Background technique [0002] As the quality of color copies and prints continues to improve and attempts are made to protect security documents such as banknotes, value documents or cards, traffic tickets or cards, tax banderols and commodity labels without reproducible effects to prevent Forged, altered or illegally copied, it is traditional practice to introduce various security features into these documents. [0003] For example, security features for secure documents may be categorized as "covert" and "overt" security features. The protection afforded by covert security features relies on the notion that such features are hidden, typically requiring specialized instrumentation and knowledge for their detection, whereas "overt" security features are readily detectable with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/037B41M3/14
CPCB41M3/14B41M3/144C09D11/037C09D11/101B42D25/378C09D11/033C09D11/322
Inventor M·德马廷梅德C-A·德斯普兰德
Owner SICPA HLDG SA