Smart Card Semifinished Product Stitching Lamination
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Solution Overview
Problem
The production of chip cards involves severe thermal stress on polycarbonate carrier materials due to double lamination, leading to damage and increased production costs from multiple process steps.
Innovation Solution
A semi-finished product is created with a substrate and compensating layer connected by stitching at tacking points away from the panels, minimizing thermal and mechanical stress, and using a single lamination step to form a monolithic card body, eliminating pre-laminated layers and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If double lamination of foils and carrier layers is performed during chip card production, then the layers are inseparably bonded to form the card body, but severe thermal stress is placed on the polycarbonate carrier material leading to damage and reduced service life
Solution Approach 1:
The patent divides the bonding process into two distinct stages: first bonding the antenna to the carrier material, then bonding the cover foil to the assembly. This segmentation allows each lamination step to use optimized parameters, reducing the cumulative thermal stress on the polycarbonate carrier material while still achieving inseparable bonding of all layers.
Solution Approach 2:
The patent employs different lamination parameters for different bonding stages. The first lamination (antenna to carrier) uses specific temperature and pressure conditions, while the second lamination (cover foil to assembly) uses different optimized parameters. This parameter differentiation reduces thermal stress on the carrier material compared to using uniform high-parameter lamination throughout.
2Strength
If double lamination operations are performed to bond all layers, then complete bonding is achieved, but a large number of process steps are required increasing production costs
Solution Approach 1:
The patent combines certain preparation steps into the lamination process itself. The antenna is positioned and prepared on the carrier material, then the first lamination simultaneously achieves both positioning and bonding. Similarly, the cover foil is prepared with alignment features that enable precise bonding in a single lamination step, reducing the total number of discrete process steps.
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 reduces thermal and mechanical stress on materials, extends the service life of chip cards, and simplifies production with fewer process steps and lower costs, while maintaining precise alignment and register accuracy.
Implementation Method 1
the substrate and the compensation layer are connected to one another by a stitching, which comprises at least two tacking points connecting the substrate and the compensation layer to one another
Implementation Method 2
at least one upper layer and/or at least one upper film are stacked one on top of the other on the semi-finished product and the stack is laminated in a lamination step to form a monolithic card body
Data Source
Figure 1~4
Figure 5~7
AI summary
The invention relates to a semifinished product (11) for producing a smart card module, to a method for producing such a semifinished product (11), and also to a method for producing a smart card (32), wherein the semifinished product (11) consists of a substrate (12) and/or a compensation layer (24) which are connected to one another by stitching comprising at least two stitching locations (28).