Multilayer Identification Card Substrate Using Segmented Polymer Layers
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Solution Overview
Problem
Current identification cards, particularly national identification cards and driver's licenses, face challenges in achieving high flex-life standards due to increased thickness and the integration of additional components like integrated circuits, which reduces their durability and flexibility.
Innovation Solution
A multilayer substrate is created through a process of co-extruding multiple polymer streams in an overlapping manner, forming a composite layer stream that is split and repositioned to achieve a high number of alternating layers, with a protective layer and identification layer, using polymers such as polycarbonate and polyester, to enhance durability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional blending of PC materials is used to increase thickness for additional components, then the card can accommodate integrated circuits and other features, but the flex-life decreases significantly to lower than 10,000 cycles
Solution Approach 1:
The card substrate is divided into multiple thin alternating layers of different polymers (e.g., polycarbonate and polyester) rather than using a single thick layer. This segmentation into 16 to 512 alternating layers allows the card to maintain flexibility while achieving the required thickness for accommodating integrated circuits and other components.
Solution Approach 2:
The invention uses composite multilayer structures combining different polymers (polycarbonate, polyester, and other biocompatible materials) in alternating layers. This composite approach leverages the complementary properties of each material to achieve both the required thickness and enhanced flex-life of 400,000 to 600,000 cycles.
2Adaptability or versatility
If integrated circuits and additional components are integrated into the card, then the functionality increases, but the flex-life is significantly reduced to lower than 10,000 cycles
Solution Approach 1:
The substrate is segmented into multiple thin alternating layers that can accommodate integrated circuits and other components within the layered structure. This segmentation allows functionality to be integrated without creating a single thick rigid structure, thereby maintaining high flex-life.
Solution Approach 2:
The invention changes the structural parameters by creating a multilayer configuration with 16 to 512 alternating layers of different polymers. This parameter change enables the card to support additional functional components while achieving flex-life of 400,000 to 600,000 cycles through the flexible nature of the multilayer structure.
3Length of stationary object
If the card thickness is increased to meet functional requirements, then more components can be integrated, but the flex-life decreases to lower than 10,000 cycles
Solution Approach 1:
The card thickness is achieved through segmentation into 16 to 512 thin alternating layers rather than a single thick layer. This segmented structure maintains flexibility and achieves flex-life of 400,000 to 600,000 cycles while providing sufficient thickness for functional requirements.
Solution Approach 2:
The invention uses composite materials with alternating layers of different polymers (polycarbonate, polyester, and other biocompatible materials) to achieve the required thickness. The composite multilayer structure provides both the necessary thickness for component integration and the flexibility required for high flex-life performance.
Data Source
AI summary
In one embodiment, a multilayer article can comprise: a multilayer substrate M, comprising: greater than or equal to 16 polymer A layers, preferably 16 to 512 polymer A layers; and greater than or equal to 16 polymer B layers, preferably 16 to 512 polymer B layers; wherein the polymer A layers and the polymer B layers are present in a ratio of 1:4 to 4:1, preferably the ratio is 1:1; a protective layer P; and an identification layer I between the protective layer P and the multilayer substrate M; wherein the identification layer I comprises information, and wherein the protective layer P prevents alteration thereof.