CN-115423064-B - Hot stamping film anti-counterfeiting method with frequency-selecting set codes

Abstract

The invention provides a hot stamping film anti-counterfeiting method with a frequency-selecting set code, which comprises the steps of randomly selecting N frequencies, designing a resonant unit set corresponding to the frequencies, selecting anti-counterfeiting areas on a cold stamping film, determining the frequencies corresponding to unit anti-counterfeiting blocks, preparing the resonant unit set corresponding to each unit anti-counterfeiting block area on the cold stamping film, and transferring the cold stamping film to the surface of a product. When the anti-counterfeiting detection is performed, aiming at the anti-counterfeiting area, traversing the selected N frequencies, and detecting whether the anti-counterfeiting area can conduct all frequencies, if so, indicating that the product is true, otherwise, the product is false. The invention utilizes the advantage of good frequency selectivity of the frequency selection surface, and prepares the surface structure corresponding to the corresponding code on the cold wave film based on the code combination by designing the frequency selection surface structure corresponding to the frequency, thereby realizing the advanced anti-counterfeiting function and having the advantages of high anti-counterfeiting performance, good adaptability, low cost and the like.

Inventors

• Lin Dingan
• LIN XIAO
• Lin Zhangbu

Assignees

• 浙江宇狮包装材料有限公司
• 浙江宇狮包装材料有限公司

Dates

Publication Date

20260421

Application Date

20220919

Priority Date

20220919

Claims (6)

1. 1. A hot stamping film anti-counterfeiting method with frequency-selecting set codes is characterized by comprising the following steps: (1) In the frequency range of 100 kHz-1 MHz, N different frequencies are arbitrarily selected; (2) Designing a resonant unit set corresponding to each frequency selected in the step (1), wherein the resonant unit set comprises a plurality of resonant units which are in the same shape and are periodically arranged; (3) Selecting an area on the cold stamping film as an anti-counterfeiting area, dividing the anti-counterfeiting area into N unit anti-counterfeiting blocks, and corresponding each unit anti-counterfeiting block to one frequency in the step (1); (4) Preparing a resonance unit set corresponding to each unit anti-counterfeiting block area on the cold stamping film according to the frequency corresponding to each unit anti-counterfeiting block of the anti-counterfeiting area and the resonance unit set characteristic corresponding to the frequency designed in the step (2); (5) Transferring the cold-stamping film with the anti-counterfeiting area onto the surface of a product, wherein the base material of the product cannot be metal, and the thickness is not more than 10mm; (6) When the anti-counterfeiting detection is performed, aiming at the anti-counterfeiting area, traversing the N frequencies selected in the step (1), and detecting whether the anti-counterfeiting area can conduct all the frequencies, if so, indicating that the product is true, otherwise, the product is false.
2. 2. The method for preventing forgery of a thermoprinting film with frequency selective set encoding according to claim 1, wherein the characteristics of the set of resonance units in step (2) include shape and size parameters of the resonance units, and periodic arrangement mode and arrangement pitch of the resonance units.
3. 3. The method for preparing the resonance unit set corresponding to each unit anti-counterfeiting block area on the cold-stamping film in the step (4) is characterized in that a layer of metal film is deposited on the cold-stamping film, and then the resonance unit set is prepared on the metal film by a laser etching technology.
4. 4. The method for preparing the anti-counterfeiting of the thermoprinting film with the frequency-selective set coding according to claim 1, wherein the specific preparation method for preparing the resonance unit set corresponding to each unit anti-counterfeiting block area on the cold-stamping film in the step (4) is that a mask plate of the resonance unit set is prepared in advance, and then the metal resonance unit set is directly deposited on the cold-stamping film through the mask plate.
5. 5. The method for preventing counterfeit of a thermoprinting film with frequency-selective set codes according to claim 1, wherein the product in the step (5) is made of PVC, acrylic, cardboard, wood or cloth.
6. 6. The method for preventing counterfeit of a thermoprinting film with a frequency-selective set code according to claim 1, wherein in the step (6), when the frequency comparison is performed, once a certain frequency is found to be not passed, the comparison is not continued, and the product is directly judged to be false.

Description

Hot stamping film anti-counterfeiting method with frequency-selecting set codes Technical Field The invention belongs to the technical field of anti-counterfeiting films, and particularly relates to a hot stamping film anti-counterfeiting method with frequency-selecting set codes. Background The prior anti-counterfeiting technology mainly comprises laser holographic identification, hidden image anti-counterfeiting, bar codes, two-dimensional codes, chemical ink printing and the like, and the anti-counterfeiting means are widely used due to the simple and easily understood physical principle, low manufacturing cost and industrialized production. However, with the popularization and publicization of these technologies, the anti-counterfeiting function is obviously reduced, which is unfavorable for realizing high-level anti-counterfeiting, so that a safe and reliable anti-counterfeiting technology with higher manufacturing technology threshold is urgently required. The Chinese patent application with the application number 202210334315.4 discloses a near-far field double-channel image display method based on a super-surface material, which combines a super-surface microstructure and a two-dimensional code pattern method to realize image display so as to realize anti-counterfeiting. The Chinese patent application with the application number 202210478851.1 discloses a face recognition method for checking and identifying anti-counterfeiting authentication scenes based on returned photos, and the method realizes anti-counterfeiting by manufacturing special anti-counterfeiting textures or anti-counterfeiting patterns, photographing, analyzing and uploading during inquiry and performing online comparison. The schemes are easy to forge in a large scale with low cost by high-precision copying and the like, the safety and reliability of the anti-counterfeiting codes are reduced, the information of the anti-counterfeiting textures or patterns is often required to be stored in the server in advance, a large amount of storage space is required, and the verification is relatively time-consuming. In addition, as a typical photochromic anti-counterfeiting film (CN 114685832A) generally comprises a base layer, a visible layer and a surface layer, different colors are realized by adjusting the proportion of fluorescent dye of the visible layer, the visible color is changed into another color visually, the effect is relatively single, the reliability is low, and the high-level anti-counterfeiting requirement cannot be met. Disclosure of Invention The invention provides a hot stamping film anti-counterfeiting method with a band-pass frequency-selecting set code aiming at the defects of the prior art. The invention is realized by the following technical scheme: A hot stamping film anti-counterfeiting method with frequency-selecting set codes comprises the following steps: (1) In the frequency range of 100 kHz-1 MHz, N different frequencies are arbitrarily selected; (2) Designing a resonant unit set corresponding to each frequency selected in the step (1), wherein the resonant unit set comprises a plurality of resonant units which are in the same shape and are periodically arranged; (3) Selecting an area on the cold stamping film as an anti-counterfeiting area, dividing the anti-counterfeiting area into N unit anti-counterfeiting blocks, and corresponding each unit anti-counterfeiting block to one frequency in the step (1); (4) Preparing a resonance unit set corresponding to each unit anti-counterfeiting block area on the cold stamping film according to the frequency corresponding to each unit anti-counterfeiting block of the anti-counterfeiting area and the resonance unit set characteristic corresponding to the frequency designed in the step (2); (5) Transferring the cold-stamping film with the anti-counterfeiting area onto the surface of a product, wherein the base material of the product cannot be metal, and the thickness is not more than 10mm; (6) When the anti-counterfeiting detection is performed, aiming at the anti-counterfeiting area, traversing the N frequencies selected in the step (1), and detecting whether the anti-counterfeiting area can conduct all the frequencies, if so, indicating that the product is true, otherwise, the product is false. The invention has the following beneficial effects: 1. The hot stamping film anti-counterfeiting method with the band-pass frequency-selective set codes has the advantages of good frequency selectivity by utilizing the frequency selective surface, and the surface structure corresponding to the corresponding codes is prepared on the cold stamping film based on the code combination by designing the frequency selective surface structure corresponding to the frequency, so that the high-grade anti-counterfeiting function can be realized, and the method has the advantages of high anti-counterfeiting performance, good adaptability, low cost and the like. 2. The hot stamping film anti-cou