Polyketone Polymer Sheets for Tamper-Resistant ID Card Printing
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Solution Overview
Problem
Current plastic ID card materials, such as PVC and polyester, lack durability and tamper-resistance, and existing printing processes are inefficient and costly, particularly when incorporating additional security features like UV or IR readable information.
Innovation Solution
Polyketone polymer sheets are thermally infused with solvent or disperse dyes using various printing techniques, allowing for durable and secure images that resist abrasion and alteration, and can incorporate security components for enhanced tamper-proofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PVC or polyester sheets are used for ID cards, then the cards can be produced with standard materials, but the cards lack sufficient durability and tamper-resistance
Solution Approach 1:
The patent uses polyketone polymer sheets as a composite material that combines the durability and tamper-resistance properties needed for secure ID cards while maintaining compatibility with standard manufacturing processes. The polyketone material serves as both the substrate and the medium for permanent image infusion, eliminating the need for separate protective layers.
2Ease of manufacture
If toner-based printing is used on plastic cards, then images can be printed easily on various plastics, but the images are easily damaged by abrasion and can be altered to produce forged documents
Solution Approach 1:
The patent employs thermal dye diffusion where dye material transitions from solid to liquid state through heating, then diffuses into the polyketone polymer matrix and re-solidifies. This phase transition process creates permanent, abrasion-resistant images that are chemically bonded within the material structure, preventing alteration or forgery.
3Ease of manufacture
If thermal transfer printing with polymer or wax layers is used, then printed images can be produced, but the images are not tamper-proof or abrasion resistant unless laminated or over-coated
Solution Approach 1:
The patent combines the substrate function and the image reception function into a single polyketone polymer sheet. The same material that forms the card body also serves as the medium that permanently absorbs and retains the printed image through thermal dye diffusion, eliminating the need for separate protective laminates or over-coats.
4Productivity
If dye diffusion printing is used with pre-coated dye ribbons, then a single step printing process is achieved, but there is significant waste of dye in portions of the ribbon not used
Solution Approach 1:
The patent applies thermal energy locally and selectively to specific areas of the polyketone sheet where images are required. The thermal dye diffusion process activates dye transfer only in the regions subjected to heat from the print head, leaving unused areas of the material unchanged and eliminating waste of dye material.
5Adaptability or versatility
If additional security features such as UV readable information or magnetic stripes are added to dye-based ribbons, then security features can be integrated, but the cost of the coated ribbon increases significantly
Solution Approach 1:
The patent separates the security feature application from the main printing process. Security features such as UV-readable materials or magnetic stripes can be applied as distinct layers or treatments to the polyketone sheet independently of the color printing process, allowing for cost-effective integration of multiple security features without requiring expensive pre-coated ribbons.
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 process results in durable, tamper-resistant ID cards with improved cost-effectiveness and ability to integrate additional security features, as the infused dyes provide long-lasting, solvent-resistant images that cannot be altered by abrasion.
Implementation Method 1
Polyketone polymer sheets are thermally infused with solvent or disperse dyes using various printing techniques
Implementation Method 2
sufficient heat applied to cause the solvent or disperse dye to infuse the polyketone sheet
Data Source
AI summary
Polyketone based polymer sheets are employed in thermal dye transfer processes to produce permanent images. Also disclosed is the use of the process to produce identification cards, security cards and labels.