Data Carrier Edge Thermal Smoothing for Passport Security
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Solution Overview
Problem
Existing methods for producing data carriers for book-like documents, such as passports, often result in burr formation on the edges during cutting, which can lead to damage during integration and compromise the security of the document.
Innovation Solution
A method and device that smooths the burr-free longitudinal edge of the data carrier by thermally deforming the front edge with a heating plate, creating a defined contour such as a chamfer, curve, or step, ensuring a secure and damage-free connection with adjacent pages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cutting or punching tool is used to trim the data carrier, then the outside shape is formed, but burrs are formed on the edge which can damage adjacent pages
Solution Approach 1:
The patent applies a preliminary smoothing action after cutting to remove burrs before the data carrier is integrated into the book-like document. This prevents the burrs from damaging adjacent pages during subsequent handling and assembly operations.
Solution Approach 2:
The patent converts the harmful burrs created by cutting into a beneficial process by using them to identify areas that need smoothing. The burrs serve as indicators for where thermal smoothing should be applied to create the desired chamfer or rounded edge profile.
2Manufacturing precision
If thermal smoothing is applied to the front edge, then a burr-free surface with defined contour is created, but additional processing time is required
Solution Approach 1:
The patent combines the cutting operation and thermal smoothing operation into a sequential process where the smoothing is immediately applied after cutting while the material is still warm and pliable. This integration reduces total processing time compared to separate operations.
Solution Approach 2:
The patent utilizes changes in material parameters (temperature and viscosity) during the thermal smoothing process to achieve edge refinement. By heating the material above its glass transition temperature, the material becomes more compliant and can be easily shaped into smooth contours.
3Ease of manufacture
If the cutting tool creates a burr on the front edge, then the cutting process is simple, but the connection of tab is compromised due to irregular surface
Solution Approach 1:
The patent applies thermal smoothing as a preliminary action before tab attachment to create a flat, burr-free surface on the front edge. This ensures that when the tab is subsequently attached, it forms a reliable connection without being interfered with by edge irregularities.
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 solution prevents edge damage and enhances the integration process by creating a smooth, burr-free surface that improves the unlocking behavior of the document, maintaining its security and aesthetic appeal.
Implementation Method 1
the front edge of the outside is thermally smoothed. By thermally deforming the front edge with burrs, a defined contour can be easily created
Implementation Method 2
The smoothed front edge is advantageously formed by a chamfer, a curve or a step as a transition
Data Source
Figure 1~3
Figure 4a~6c
AI summary
The invention relates to a data carrier as well as a method and a device for producing such a data carrier for a book-like document, in particular a valuable and/or security document, which consists of at least two layers forming a film composite and has at least one outer surface (35) whose end face (41) is bounded by two end edges (42, 43) extending along the outer surface (35), wherein a burr (44) formed by a cutting process on the end edge (42, 43) of the outer surface (35) of the film composite is smoothed.