Tamper-Evident Envelope with Curved Welds
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Solution Overview
Problem
Existing security envelopes require complex welding processes, necessitating specialized tools and expertise, and can be compromised without visible damage, making them difficult to secure and verify.
Innovation Solution
A security envelope with flexible plastic sheets featuring continuous welds of variable width and direction, incorporating a visual indicator system to prevent unauthorized access, allowing for secure closure without welding tools and ensuring tamper evidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous rectilinear weld lines are used to ensure safety and impermeability, then the envelope achieves secure closure, but the available volume for accommodating articles is reduced and material is lost
Solution Approach 1:
The patent applies curved weld lines instead of straight rectilinear welds. The weld lines follow curved paths that optimize the balance between security/permeability and internal volume, reducing material loss while maintaining envelope integrity.
2Reliability
If complex welding processes with specialized tools are used, then secure closure is achieved, but the ease of operation and accessibility are reduced
Solution Approach 1:
The envelope incorporates self-closing features through its weld design and structural configuration, allowing it to seal automatically or with minimal user intervention, eliminating the need for specialized welding tools and expert operation.
Solution Approach 2:
The patent replaces complex mechanical welding processes with simplified closure mechanisms that achieve secure sealing through alternative means, making the envelope accessible to ordinary users without specialized equipment.
3Ease of manufacture
If standard weld lines are used, then closure is achieved, but the ability to detect tampering is reduced
Solution Approach 1:
The patent incorporates visual indicators into the weld lines that change appearance or reveal themselves when the envelope is tampered with, allowing recipients to easily detect if the envelope has been opened or compromised.
Solution Approach 2:
The curved weld lines themselves serve as visual indicators of tampering, as any attempt to open the envelope would disrupt the continuous curved pattern, making tampering immediately visible without requiring additional detection mechanisms.
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 envelope provides a simple, safe, and secure closure mechanism that is difficult to reproduce, ensuring the integrity of contents while allowing users to verify non-access attempts through visible indicators.
Implementation Method 1
assembled together by welding on at least two of their edges
Data Source
Figure 1~2
Figure 3A~5
AI summary
The envelope (1) has a sheet (3) assembled with another sheet by welding on two of longitudinal edges (4, 5) and transversal edges (6, 7) for forming a closed inner volume, where the sheets are made of flexible plastic material. An opening (9) provides access to the inner volume, and is totally covered by a closing system i.e. security adhesive (13). Each edge of the envelope comprises a weld (8) having a progressive width and/or an outer side or an inner side with a progressive localized direction.