Micro/nano diffractive anti-counterfeiting silk and preparation method thereof

Abstract

The invention relates to a micro / nano diffractive anti-counterfeiting silk and a preparation method thereof. The micro / nano diffractive anti-counterfeiting silk comprises a PET base material layer, a polymeric protective layer coating any surface of the PET base material layer, a holographic information layer and a metal aluminum layer, wherein the holographic information layer is embedded into the polymeric protective layer, and the bottom of the holographic information layer is in contact with the PET base material layer; the metal aluminum layer is embedded into the polymeric protective layer and formed on the holographic information layer; a micro / nano diffractive grating is formed on the upper surface of the metal aluminum layer. On one hand, the micro / nano diffractive grating is formed on the upper surface of the metal aluminum layer, and on the other hand, the holographic information layer in contact with the PET base material layer is embedded into the polymeric protective layer, the holographic information layer can form clear and complete characters under a magnifying glass, and the micro / nano grating shows colorful rainbow gloss in specific light rays, so that the multiple anti-counterfeiting function is achieved.

Description

technical field [0001] The invention relates to an anti-counterfeit thread, in particular to a micronano diffraction anti-counterfeit thread and a preparation method thereof. Background technique [0002] Anti-counterfeiting thread is a strip material, which is used in national high-end anti-counterfeiting fields such as banknotes, securities, entry and exit passes, visas, etc.; optionally, the anti-counterfeiting thread can be curved, or woven into the banknote paper to make the banknote have Additional security. As an example, one of the earliest forms of security thread consisted of a reflective foil transferred to the face of a banknote by branding (GB2119312A). This reflective foil prevents counterfeit banknotes from being reproduced by printing processes such as printers, PC printers and copiers. Many existing anti-counterfeiting threads are easy to be imitated, because these anti-counterfeiting threads are only engraved with text or numbers as anti-counterfeiting ma...

AI Technical Summary

Problems solved by technology

Many existing anti-counterfeiting threads are easy to be imitated, because these anti-counterfeiting threads are only engraved with text or numbers as anti-counterfeiting marks, and these inlays or microprints cannot produce high-resolution images, which are likely to bring greater losses to users

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