Single-Layer Fibrous Security Insert With Ultrasonic T-Cavity
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Solution Overview
Problem
Existing methods for creating cavities in security documents to house contactless communication devices are inefficient, leading to inadequate protection, deformation, and increased costs due to mechanical processes like milling, perforation, and laser formation, which can weaken the material and fail to provide optimal thickness and security.
Innovation Solution
A flat insert with a single-layer fibrous support featuring a cavity that opens on one face, housing a contactless communication device without generating extra thickness, using a compression method with a shoulder to form a 'T'-shaped cavity suitable for module chips, ensuring the device is fully inserted and protected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical processes (milling, countersinking, boring) are used to form the cavity, then the cavity can be created in the support, but the cavity bottom becomes non-flat and causes fiber tearing and deformation
Solution Approach 1:
The patent replaces traditional mechanical cutting processes (milling, countersinking, boring) with an ultrasonic vibration-based cavity formation process. The ultrasonic tool vibrates at high frequency to erode and remove material, creating a flat-bottomed cavity without the fiber tearing and deformation caused by conventional mechanical contact, thus resolving the contradiction between ease of manufacture and manufacturing precision.
2Productivity
If perforation is used to form the cavity, then the cavity can be created quickly, but the electronic device becomes accessible and vulnerable to mechanical and chemical attacks
Solution Approach 1:
The patent creates a cavity with specific local quality features: a flat bottom and a peripheral shoulder structure. The peripheral shoulder provides localized protection by creating an overhang that shields the electronic device from direct access, while the cavity remains open enough to allow device insertion. This local structural differentiation resolves the contradiction between quick cavity formation and device protection.
3Manufacturing precision
If laser is used to form the cavity, then the cavity can be created with precision, but the process is time-consuming, expensive, and weakens the support material
Solution Approach 1:
The patent substitutes the laser-based cavity formation process with an ultrasonic vibration-based process. While laser provides precision, it is time-consuming and expensive while weakening the material. The ultrasonic process achieves comparable or superior precision through controlled material removal via high-frequency vibration, without the thermal damage and cost associated with laser processing, thus resolving the contradiction between precision and time loss.
4Device complexity
If a single-layer fibrous support is used, then the insert is simple and cost-effective, but existing methods cause fiber tearing and deformation
Solution Approach 1:
The patent maintains the simple single-layer fibrous support structure while replacing the damaging mechanical cutting process with ultrasonic vibration-based cavity formation. The ultrasonic process removes material through high-frequency oscillation rather than mechanical contact, preventing fiber tearing and deformation. This resolves the contradiction between structural simplicity and fiber integrity by eliminating the harmful manufacturing process while preserving the simple design.
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 provides enhanced protection and security by maintaining the device's position within the cavity, preventing deformation and external attacks, while maintaining a constant thickness and reducing manufacturing complexity and costs.
Implementation Method 1
forming a cavity in the support by compression by means of a part having a shoulder so that the cavity is open on a single face of the support
Data Source
Figure 1~3d
AI summary
The invention relates to a flat insert intended for being inserted in a security document, which includes a fibrous substrate (2) formed as a single layer having a cavity (5) and an electronic device (3) having contactless communication, housed in said cavity. Said cavity is in communication with a single surface of the fibrous substrate (2) and includes, in the cross-section thereof, a peripheral shoulder (13) for housing said electronic device in said cavity without generating a thickened portion of the insert, said fibrous substrate (2) including synthetic fibres.