Light variation anti-forgery element with multiple anti-forgery functions

A technology of anti-counterfeiting components and functions, applied in optics, nonlinear optics, printing, etc., can solve problems such as increasing the technical difficulty of counterfeiting

Inactive Publication Date: 2010-12-08
SECURITY PRINTING INST OF PEOPLES BANK OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve the above effects, this anti-counterfeit element must first be convenient for the public to identify with the naked eye, an

Method used

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  • Light variation anti-forgery element with multiple anti-forgery functions
  • Light variation anti-forgery element with multiple anti-forgery functions
  • Light variation anti-forgery element with multiple anti-forgery functions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] On the surface of the PET substrate (substrate layer) 1, metal ink is used to print the negative pattern in the form of gravure to form the negative text "PEOPLE", and dry to form a partial metal layer (hollow metal layer) 2;

[0057] Apply a solution of LPP (molecular formula III) with a concentration of 2% on the other side of the substrate, dry it, and control the thickness to about 50nm to form a linear photopolymerization material layer; "The photomask plate uses a certain angle of linearly polarized ultraviolet light to ray the linear photopolymerization material layer, so that the photo-alignment material molecules irradiated by the light will be arranged into patterns and solidified; then remove the photomask plate and use another angle The rest of the linearly polarized ultraviolet light is irradiated, and anisotropic micro-regions selectively oriented in different directions are formed in the linear photopolymerization material layer, forming a photoalignment m...

Embodiment 2

[0063] On the surface of the aluminum layer of the aluminum-plated BOPP substrate (substrate layer) 1, a protective layer is printed by gravure, and then the aluminum layer of the unprotected part is corroded with lye, washed with water, dried, and the inscribed text can be seen "CBPMC", forming local metal layer 2;

[0064] Coating and forming a photo-alignment material layer 3 and a liquid crystal polymer layer 4 on the surface of the metal layer 2 in the same process as in Example 1, and loading the hidden information "CHINA" in the liquid crystal polymer layer 4;

[0065] Coat the cholesteric liquid crystal solution on the other side of the BOPP substrate 1, dry and remove the solvent, and use ultraviolet light to cross-link and solidify the cholesteric liquid crystal under an inert atmosphere to form a cholesteric liquid crystal layer 6;

[0066] Then on the surface of the cholesteric liquid crystal layer 6, the overprinting appearance color is the same, and the dark infr...

Embodiment 3

[0070] Coating holographic molding glue on the surface of PET substrate (substrate layer) 1, drying to form a molding layer, processing the molding layer with a molding plate, and then vapor-depositing an aluminum layer on the surface of the molding layer to form a "BANK" text message Holographic layer 5;

[0071] Then, a protective layer is printed by gravure on the surface of the aluminum layer, the unprotected part of the aluminum layer is corroded with lye, washed with clear water, and dried to form a partial metal layer 2 with the text message "PEOPLE";

[0072] On the other side of the PET substrate 1, the photo-alignment material layer 3 and the liquid crystal polymer layer 4 are coated in the same manner as in Example 1, and the hidden information "CHINA" is loaded in the liquid crystal polymer layer 4;

[0073] Form the cholesteric liquid crystal layer 6 in the same manner as in Example 2 on the surface of the liquid crystal polymer layer 4, and then overprint hard ma...

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Abstract

The invention provides a light variation anti-forgery element with multiple anti-forgery functions, which is provided with at least one linear photo-polymerization material layer directed at different directions selectively, at least one optical isotropic material layer and at least one metal layer existing at the local part of the anti-forgery element. The anti-forgery element can have a first-line anti-forgery characteristic provided with a hollow-out metal graphic and a second-line anti-forgery characteristic for hidden information and the like identified by a polaroid. On the basis of the anti-forgery characteristics, the anti-forgery element can combine with the light variation effect of color change along with the angle, and the light variation effect of rainbow holography and/or machine-readable identified encoding characteristics, thus realizing organic combination of the first-line, the second-line and a third-line anti-forgery technologies, having the anti-forgery characteristic which is easy for people to recognize and is difficult to forge and higher anti-forgery level, and providing safe and reliable anti-forgery effect for objects provided with the anti-forgery element. The invention also provides an object with the anti-forgery element.

Description

technical field [0001] The invention relates to an optical anti-counterfeiting element with multiple anti-counterfeiting functions for protecting valuable articles, in particular to an anti-counterfeiting element integrating metal hollow characters and hidden positive and negative film features identified by polarizers. Background technique [0002] Anti-counterfeiting elements are usually used to identify the authenticity of valuable items. The anti-counterfeiting technologies used in anti-counterfeiting elements with first-line anti-counterfeiting features usually include holographic optical changes, watermarks, micro-holes, optical variable inks, etc. For example, US 6686042 discloses an optically variable pigment that can be used for anti-counterfeiting, wherein the pigment has at least one reflective layer, a selective absorbing layer on the surface of the reflective layer, a dielectric layer on the surface of the absorbing layer, and a dielectric layer on the surface of...

Claims

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Application Information

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IPC IPC(8): B42D15/00B42D15/10G02F1/137B42D25/30B42D25/364B42D25/373
Inventor 古道明黄小义王斌周基炜柯光明刘卫东
Owner SECURITY PRINTING INST OF PEOPLES BANK OF CHINA
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