Coextruded Security Thread in Data Carrier Card
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Solution Overview
Problem
The incorporation of a security thread into data carrier cards, such as chip or magnetic strip cards, poses technical difficulties due to the need for special adhesives, increased production effort and cost, restricted material choices, and impaired appearance, as well as reduced mechanical stability and susceptibility to external factors.
Innovation Solution
Integrating the security thread into the plastic foils of the card body during coextrusion, eliminating the need for separate adhesives and allowing for cost-efficient manufacturing and flexible processing options, while maintaining mechanical stability and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a security thread is incorporated into a data carrier card using special adhesives, then the mechanical stability of the composite is improved, but the manufacturing complexity and costs increase
Solution Approach 1:
The security thread is coextruded together with the plastic foil in a single integrated manufacturing process, merging two previously separate components (security thread and card body foil) into one homogeneous structure. This eliminates the need for separate adhesives and multiple manufacturing steps, reducing complexity while maintaining mechanical stability.
Solution Approach 2:
The security thread is integrated into the plastic foil during the coextrusion process before the foil is cut and processed into final card components. This preliminary integration ensures mechanical stability is built into the structure from the beginning, avoiding later assembly steps that would increase manufacturing complexity.
2Reliability
If a security thread is applied to a plastic foil, then security features are improved, but the ease of further processing is reduced
Solution Approach 1:
By coextruding the security thread with the plastic foil, the security features become an integral part of the foil structure rather than a separate applied element. This merging allows standard processing techniques to work on the combined structure without special considerations for adhesive layers or separate security components.
Solution Approach 2:
The coextrusion process changes the physical state and integration level of the security thread, transforming it from a separate applied element to an integrated component at the molecular level. This parameter change in integration depth enables easier further processing while maintaining security effectiveness.
3Reliability
If a security thread is incorporated into the card body, then security is improved, but the appearance is impaired due to local thickening
Solution Approach 1:
The coextrusion process merges the security thread with the plastic foil into a single homogeneous layer with uniform thickness. This eliminates the local thickening that would occur with separate security threads, maintaining a smooth, uniform card appearance while preserving security features within the integrated structure.
Solution Approach 2:
The coextrusion process changes the dimensional parameters of the security thread integration, distributing it uniformly throughout the foil thickness rather than adding it as a separate layer. This parameter change in thickness distribution eliminates surface irregularities and maintains aesthetic appearance.
4Shape
If a security thread without carrier foil is used, then the appearance is improved, but the durability is reduced
Solution Approach 1:
The coextrusion process merges the security thread material with the card body plastic into a single integrated structure. This provides the durability and protection of a carrier foil while maintaining the appearance benefits of a foil-less design, as the security thread becomes an integral part of the card body itself.
Solution Approach 2:
The coextruded structure creates a composite material where the security thread and card body plastic are combined at the molecular level. This composite provides enhanced durability and resistance to environmental factors while maintaining a uniform appearance without a separate carrier foil.
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
This method enables cost-effective production of data carrier cards with integrated security threads that are mechanically stable and offer flexibility in processing, without creating predetermined weak points, thus enhancing security and appearance.
Implementation Method 1
The security thread is coextruded with the one foil or with at least one of the several foils of the card body
Data Source
AI summary
A data carrier card, in particular a chip and/or magnetic strip card, has a card body comprising one or more films and a security thread integrated in the card body. The security thread, or at least a substrate of the security thread, is coextruded in the form of a thread strip in one of the films.