Optical anti-fake film with accurate aluminum washing and preparation method thereof

Abstract

The inVention discloses a preparation method of an optical anti-fake film with accurate aluminum washing. A micro-nano structure is imprinted on an information layer through a metal reflection layer,and the metal reflection layer of the micro-nano structure region breaks so as to fit the micro-nano structure of the information layer; a photocurable coating with alkaline solubility coats the metal reflection layer to form a light-sensing protectiVe layer, and light makes incidence from the side of a base membrane and irradiates the light-sensing protectiVe layer of the micro-nano structure region through a breakage gap of the metal reflection layer to solidify the light-sensing protectiVe layer; the part, not solidified, of the light-sensing protectiVe layer and the metal reflection layercorresponding to the coating are remoVed through alkaline wash; coating of a gum layer is performed, and therefore the optical anti-fake film with a clear and accurate boundary is obtained. Accordingto the technical scheme of the method, in order to solVe the problems that in an existing aluminum washing technology, oVerprint precision is low, operation difficulty is high, and a safe coefficientis low, the reasonable micro-optics nanometer structure is designed, the structure, light-transmitting mechanism and optical material of the reflection layer are researched, aluminum-remoVal precision with near-zero offset can be realized, and the optical anti-fake film is suitable for all kinds of empaistic optical anti-fake structures.

Description

technical field [0001] The invention belongs to the technical field of anti-counterfeiting, and in particular relates to an optical anti-counterfeiting film precisely washed with aluminum and a preparation method thereof. Background technique [0002] Optically variable pattern (OVI) is one of the important anti-counterfeiting technical means due to its high technical content, complicated preparation process and special optical effect. At present, the common optically variable patterns include matte platinum relief effect, Fresnel lens effect, various effects based on holographic technology, and two-color light-changing technology based on zero-order diffraction. These anti-counterfeiting effects are widely used in national certificates, brand protection and other fields. Optically variable patterns are generally generated based on optical diffraction or optical reflection of micro-nano structures, and usually consist of a base film, an information layer, a reflective layer...

AI Technical Summary

Problems solved by technology

The method of the technical solution of the present invention aims at the situation that the positioning accuracy of the existing aluminum washing technology is not high, the operation is difficult, and the safety factor is low. The research of materials can obtain the precision of aluminum removal close to zero deviation, which is suitable for various relief optical anti-counterfeiting structures

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