Tamper-evident closure with frangible shell and irreversible gap
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Solution Overview
Problem
Existing tamper-evident closure systems are difficult to design such that they cannot be reactivated to appear non-activated once opened, and they often rely on mechanisms that can be defeated by simple cutting operations or do not provide irreversible evidence of opening.
Innovation Solution
A tamper-evident closure system comprising a shell with a first and second shell part, a tamper-evident overcap with a cap fixed to the first shell part and a tamper-evident member releasably connected to the cap and located around the second shell part, ensuring that the first and second shell parts cannot be separated unless the member is released, and featuring a gap-forming mechanism that prevents return to the original closed position, thus providing irreversible evidence of opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a closure system uses a simple removable cap design, then ease of operation is improved, but tamper evidence capability deteriorates
Solution Approach 1:
The closure is divided into multiple functional segments: a removable cap for easy opening, a shell with frangible connection for tamper evidence, and an overcap with sealing function. This segmentation allows each part to fulfill its specific function while maintaining overall system effectiveness.
Solution Approach 2:
The frangible connection between shell parts is pre-configured to break at a specific point during initial opening, creating irreversible evidence before the cap is removed. This preliminary action ensures tamper evidence is established before the user interacts with the closure.
2Reliability
If a closure uses a frangible connection between shell parts, then tamper evidence is improved, but device complexity increases
Solution Approach 1:
The frangible connection is integrated directly into the shell structure itself, combining the shell and tamper evidence mechanism into a single unified component rather than adding separate tamper evidence devices. This merging reduces overall complexity while maintaining effectiveness.
Solution Approach 2:
The frangible connection uses a sacrificial, single-use element designed to break irreversibly upon first opening. This disposable component provides reliable tamper evidence without requiring complex reusable mechanisms, simplifying the overall design.
3Ease of operation
If a closure system allows the cap to be removed and reinstalled, then ease of operation is improved, but reliability of tamper evidence deteriorates
Solution Approach 1:
The frangible connection breaks during the first opening operation, creating irreversible evidence before the cap can be removed and reinstalled. This preliminary structural change ensures that any subsequent reinstallation of the cap will not restore the original closed state, maintaining tamper evidence integrity.
Solution Approach 2:
Instead of relying on the cap or a separate mechanism to provide tamper evidence, the invention inverts the approach by making the shell structure itself provide evidence through its frangible connection. The irreversible change occurs in the supporting structure rather than in the removable component.
Data Source
AI summary
A tamper-evident closure (1) for a container, the closure comprising: a shell comprising a first shell part (3A) and a second shell part (3B); and a tamper-evident overcap, the overcap comprising a cap (4A) which is fixed to the exterior of the first shell part and a tamper-evident member (4B) which is releasably connected to the cap (4A) and releasably located around the exterior of at least part of the second shell part (3B), such that the first and second shell parts (3A, 3B) cannot be separated unless the member (4B) is released, and thereafter the cap (4A) is removable together with the first shell part (3A).