Card Laminate With Segmented Relief Foil for Extraction Resistance
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Solution Overview
Problem
Existing relief structures in cards can be easily extracted and reused for counterfeiting, making it difficult to authenticate the authenticity of the cards, and existing 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 in a card using conventional methods (press method, casting method, or photopolymerization method), then the relief structure maintains its shape and provides authentication, but the relief structure can be extracted and reused for counterfeiting
Solution Approach 1:
The card is divided into multiple layers including a base sheet, relief structure, and cover sheet. The relief structure is further segmented into island regions with different adhesion characteristics. This segmentation prevents complete extraction while maintaining authentication functionality in the remaining portions.
Solution Approach 2:
Different regions of the relief structure have different adhesion strengths to the base sheet. Island regions have stronger adhesion than surrounding areas, creating localized variations in bonding. This local quality difference ensures that attempted extraction leaves the relief structure damaged and non-functional for authentication.
2Device complexity
If a relief structure is disposed on the outer surface of a card, then the card structure is simpler, but the relief structure has lower resistance to chemicals, abrasion, and tampering
Solution Approach 1:
The relief structure is nested between the base sheet and cover sheet, with the base sheet and cover sheet enclosing the relief structure. This nested configuration protects the relief structure from external chemical, abrasive, and tampering attacks while maintaining a relatively simple overall card structure.
3Object-affected harmful factors
If the adhesion strength between the relief structure and base sheet is increased uniformly, then extraction is prevented, but the relief structure cannot be properly formed or detached during manufacturing
Solution Approach 1:
The adhesion strength between the relief structure and base sheet varies spatially across different regions. Island regions have higher adhesion strength while other regions have lower adhesion. This local variation allows the relief structure to be properly formed and detached during manufacturing while preventing complete extraction after card assembly.
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 and simplifying authentication.
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
laser engraving individual information on each ID card including a substrate that is mainly composed of polycarbonate and contains a pigment or an additive that develops color by irradiation with a laser beam (YAG, CO2, etc.)
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.