Card Laminate Relief Foil Structure Against Counterfeit Extraction
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Solution Overview
Problem
Existing relief structures in cards can be extracted and reused to produce counterfeit cards, making it difficult to authenticate the authenticity of the cards, and current anti-tampering methods require complex processes or devices.
Innovation Solution
A laminate structure with a transfer foil containing a relief structure, composed of thermoplastic, thermosetting, and ultraviolet curable resins, featuring island and sea regions with varying functional groups and adhesion strengths, making it difficult to separate the foil without damaging the relief structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relief structure is enclosed within a card using conventional methods, then the relief structure can be extracted and reused to produce counterfeit cards, but if the relief structure is disposed on the outer surface, it has lower resistance to chemicals, abrasion, and tampering
Solution Approach 1:
The transfer foil is divided into island regions (with relief structure and high adhesion) and sea regions (without relief structure and low adhesion). This segmentation allows the foil to be separated in controlled ways that prevent complete extraction while maintaining authentication functionality in the remaining portions.
Solution Approach 2:
Different regions of the transfer foil have different adhesion properties: island regions have high adhesion strength to prevent extraction, while sea regions have low adhesion strength to allow controlled separation. The relief structure is selectively positioned only in island regions, creating local variations in both adhesion and authentication properties.
2Object-affected harmful factors
If the adhesion strength between transfer foil and card is increased to prevent extraction, then the foil cannot be separated for reuse, but if adhesion strength is decreased, the foil can be easily removed and reused
Solution Approach 1:
The transfer foil is divided into island regions (with relief structure and high adhesion) and sea regions (without relief structure and low adhesion). This segmentation allows the foil to be separated in controlled ways that prevent complete extraction while maintaining authentication functionality in the remaining portions.
Solution Approach 2:
The adhesion strength parameter is varied across different regions of the transfer foil. Island regions have high adhesion strength (e.g., 0.5-2.0 N/25mm) to prevent extraction, while sea regions have low adhesion strength (e.g., 0.05-0.2 N/25mm) to allow controlled separation, creating a gradient of adhesion properties.
3Object-affected harmful factors
If a single-layer transfer foil is used, then the manufacturing process is simple, but the foil can be easily separated and reused; if a multi-layer complex structure is used, then extraction becomes difficult, but the manufacturing process becomes complex
Solution Approach 1:
The transfer foil uses a composite resin structure combining thermoplastic resin (provides structural framework) and thermosetting resin (provides adhesion in island regions). This composite material approach achieves both extraction resistance and authentication functionality without requiring complex multi-layer structures.
Solution Approach 2:
The transfer foil is divided into island regions (with relief structure and high adhesion) and sea regions (without relief structure and low adhesion). This segmentation allows the foil to be separated in controlled ways that prevent complete extraction while maintaining authentication functionality in the remaining portions.
4Strength
If the entire transfer foil has uniform high adhesion strength, then extraction is prevented, but controlled separation for legitimate purposes becomes difficult; if uniform low adhesion strength is used, then separation is easy but extraction prevention fails
Solution Approach 1:
Different regions of the transfer foil have different adhesion properties: island regions have high adhesion strength to prevent extraction, while sea regions have low adhesion strength to allow controlled separation. The relief structure is selectively positioned only in island regions, creating local variations in both adhesion and authentication properties.
Solution Approach 2:
The adhesion strength parameter is varied across different regions of the transfer foil. Island regions have high adhesion strength (e.g., 0.5-2.0 N/25mm) to prevent extraction, while sea regions have low adhesion strength (e.g., 0.05-0.2 N/25mm) to allow controlled separation, creating a gradient of adhesion properties.
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 prevents unauthorized reuse of the relief structure, enhancing security by maintaining the integrity of the relief structure during attempted extraction, thus reducing counterfeiting.
Implementation Method 1
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
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 4
an adhesive layer that is different in adhesion strength between a first region and a second region, wherein the first region includes the relief structure
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.