Card Laminate with Segmented Relief Structures for Counterfeit Resistance
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Solution Overview
Problem
Existing relief structures in cards can be extracted and reused to create counterfeit cards, making it difficult to authenticate the authenticity of the cards, and current anti-counterfeiting methods are not effective in preventing unauthorized reuse of transfer foils with relief structures.
Innovation Solution
A laminate is designed with a transfer foil having a relief forming layer composed of thermoplastic, thermosetting, or ultraviolet curable resin, featuring island regions with functional groups and rough surfaces, and sea regions without, along with varying interfacial adhesion strengths between layers to prevent unauthorized separation and reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relief structure is enclosed within a card using conventional methods, then the relief structure maintains its shape and can be extracted, but this enables counterfeit reproduction by reusing the extracted relief structure
Solution Approach 1:
The relief structure is divided into multiple independent relief patterns arranged in a matrix, where each pattern contains authentication information. This segmentation ensures that extracting one relief pattern does not compromise the entire relief structure, as multiple patterns remain to provide authentication
Solution Approach 2:
Different regions of the card substrate are treated differently: some regions contain relief structures with strong adhesion to the substrate, while other regions have relief structures with weak adhesion that can be easily removed. This local differentiation prevents complete extraction and reuse of the relief structure for counterfeiting
2Difficulty of detecting and measuring
If a relief structure is disposed on the outer surface of a card, then extraction is easier to detect, but resistance to chemicals, abrasion, and tampering is reduced
Solution Approach 1:
The relief structure is nested within the card substrate rather than being placed on the outer surface. This nesting provides protection against chemicals, abrasion, and tampering while maintaining the ability to detect extraction through authentication procedures that check for the presence and integrity of relief patterns
3Productivity
If the same transfer foil is used across cards of the same type, then manufacturing efficiency is improved, but the risk of counterfeit reproduction increases when extraction occurs
Solution Approach 1:
The transfer foil contains multiple segmented relief patterns instead of a single continuous relief structure. This allows efficient mass production of identical transfer foils while ensuring that extraction of one pattern leaves other patterns intact for authentication, thereby preventing successful counterfeiting
Solution Approach 2:
The transfer foil is designed with regions of different adhesion strength: some relief patterns are strongly adhered to the substrate while others are weakly adhered. This local quality differentiation maintains manufacturing efficiency through standardized production while preventing counterfeit reproduction by making complete extraction difficult
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The laminate structure makes it difficult to maintain the integrity of the relief structure during unauthorized extraction, reducing the effectiveness of counterfeit reproduction and facilitating easy identification of reused transfer foils.
Implementation Method 1
the photopolymerization method is a method in which a radiation curable resin to be cured by exposure to radiation in a broad sense, such as ultraviolet light (UV) or electron beams (EB), is poured into the space between a relief structure replication mold and a flat substrate such as a plastic film, and the radiation curable resin is cured by radiation exposure to produce a cured film
Implementation Method 2
relief structures that are enclosed within cards in which authentication information is recorded such as identification cards (ID cards), passports, or driver's licenses and that have properties such as diffraction properties, scattering properties, and reflection properties
Implementation Method 3
When a relief layer located inside the transparent substrate of the card is irradiated with light, concavities and convexities of the relief layer cause interference of incident light through the transparent substrate
Implementation Method 4
an adhesive layer that is different in material from the relief forming layer and that has a different adhesion strength from the adhesion strength between the relief forming layer and the reflective layer
Data Source
AI summary
A laminate of the present invention includes, in a thickness direction of the laminate, a transfer foil in which at least a patch substrate, a relief forming layer, a reflective layer, and an adhesive layer are sequentially laminated, a protective sheet that is provided on a first side of the transfer foil in the thickness direction, and an information recording sheet that is provided on a second side of the transfer foil facing away from the protective sheet in the thickness direction.